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- SECTION 04901
-
- MASONRY RESTORATION MORTARS AND GROUTS
-
- NOTE ** Jahn Masonry Restoration Mortars for repair of
- concrete, concrete masonry, brick masonry, terra
- cotta, and stone.
- NOTE **
- NOTE ** This section is based on Jahn Masonry Restoration
- Mortars manufactured by Cathedral Stone Products,
- Inc., located at the following address:
- NOTE ** 8332 Bristol Court, #107
- NOTE ** Jessup, MD 20794
- NOTE ** Tel: (301) 317-4658
- NOTE ** Fax: (301) 317-4670
- NOTE ** E-Mail address: Info@jahnmortars.com
- NOTE ** Home Page: HTTP://WWW.JAHNMORTARS.COM
- NOTE **
- NOTE ** Jahn Masonry Restoration Mortars are a complete
- line of products for repair of concrete, concrete
- masonry, brick masonry, terra cotta, and stone
- substrates.
- NOTE **
- NOTE ** SECTION 04901 - MASONRY RESTORATION MORTARS AND
- GROUTS, Copyright 1998, The Architect's Catalog,
- Inc.
-
- PART 1 GENERAL
-
- 1.1 SECTION INCLUDES
- NOTE ** Delete items below not required for project.
-
- A. Masonry Injection Adhesive.
-
- B. Masonry Injection Grout.
-
- C. Masonry Void Injection Grout.
-
- D. Limestone, Sandstone Patching Mortar.
-
- E. Anchor Setting Mortar.
-
- F. Horizontal Concrete Patch.
-
- G. Vertical Concrete Patch.
-
- H. Brick/Terra Cotta Patching Mortar.
-
- I. Masonry Pointing Mortar.
-
- J. Marble Patching Mortar.
-
- K. Casting Mortar.
-
- L. Bluestone and Granite Patching Mortar.
-
- M. Accessories.
-
- 1.2 RELATED SECTIONS
- NOTE ** Delete any sections below not relevant to this
- project; add others as required.
-
- A. Section 03930 - Concrete Rehabilitation.
-
- B. Section 04910 - Unit Masonry Restoration.
-
- C. Section 04920 - Stone Restoration.
-
- 1.3 SYSTEM DESCRIPTION
-
- A. Performance Requirements: Supply mortar materials which
- require the addition of water only at site for correct
- performance; mortar materials requiring site-mixing of
- additives to achieve correct performance are not
- permitted.
-
- 1.4 SUBMITTALS
-
- A. Submit under provisions of Section 01300.
-
- B. Product Data: Manufacturer's descriptive literature for
- each type mortar specified in this section.
- NOTE ** Delete the following paragraph if specifying custom
- colors or finishes.
-
- C. Selection Samples: Two sets of color chips representing
- manufacturer's full range of available colors.
-
- D. Verification Samples: Two samples, minimum size 3 inches
- (76 mm) square, representing actual color and finish of
- products to be installed.
-
- E. Quality Assurance Submittals:
- 1. Manufacturer's certification that installer of
- manufacturer's product is approved.
- 2. Manufacturer's instructions:
- a. Printed installation instructions for each
- product specified in this section.
- b. Manufacturer's Safety Data Sheets (M.S.D.S.)
-
- 1.5 QUALITY ASSURANCE
-
- A. Installer Qualifications: Authorized by manufacturer of
- products of this section.
- NOTE ** Delete the following paragraph if not required.
-
- B. Mock-ups:
- 1. Construct mock-ups using materials specified in this
- section.
- NOTE ** Retain one of the following two sub-paragraphs.
- 2. Construct mock-ups as directed, at location indicated
- or directed.
- 3. Construct mock-ups at location indicated or directed,
- and as follows:
- a. Size: ___ feet by ___ feet (___ mm by ___ mm).
- b. Include ________.
- 4. Obtain Architect's acceptance of mock-ups before
- beginning construction activities of this section;
- accepted mock-ups will be standard by which completed
- construction activities of this section is judged.
- NOTE ** Retain one of the following two sub-paragraphs.
- 5. Mock-ups may not remain as part of Work.
- 6. Accepted mock-ups may remain as part of Work.
- NOTE ** Delete the following paragraph if not required.
-
- C. Pre-Installation Meetings:
- 1. Convene at job site seven (7) calendar days prior to
- scheduled beginning of construction activities of
- this section to review requirements of this section.
- 2. Require attendance by representatives of the
- following:
- a. Manufacturers of products of this section.
- b. Installer of this section.
- c. Other entities directly affecting, or affected
- by, construction activities of this section.
- 3. Notify Architect four (4) calendar days in advance of
- scheduled meeting date.
-
- 1.6 DELIVERY, STORAGE, AND HANDLING
-
- A. Store products of this section in manufacturer's unopened
- packaging until installation.
-
- B. Maintain storage area for products of this section in
- accordance with manufacturer's instructions until
- installation.
-
- 1.7 PROJECT/SITE CONDITIONS
-
- A. Environmental Requirements: Do not apply mortars to
- frozen or hot substrates; apply mortars only when ambient
- surface temperature is between 40 degrees F (4 degrees C)
- and 90 degrees F (32 degrees C), with low to average
- humidity.
-
-
- PART 2 PRODUCTS
-
- 2.1 MANUFACTURERS
-
- A. Acceptable Manufacturer: Cathedral Stone Products, Inc.;
- 8332 Bristol Court, #107, Jessup, MD 20794. ASD. Tel:
- (301) 317-4658, Fax: (301) 317-4670; E-Mail address:
- Info@jahnmortars.com; Home Page:
- HTTP://WWW.JAHNMORTARS.COM
- NOTE ** Delete one of the two following paragraphs;
- coordinate with Division 01 requirements.
-
- B. Requests for substitution will be considered in
- accordance with provisions of Section 01600.
-
- C. Substitutions: Not permitted.
- NOTE ** Delete following paragraph if substitutions not
- permitted.
-
- D. Unless otherwise specified for an individual product or
- material, supply all products specified in this section
- from the same manufacturer.
-
- 2.2 MATERIALS
-
- A. Masonry Injection Adhesive: JAHN M30 Micro Injection
- Adhesive; low-viscosity, single-component injection grout
- for stabilization and rehabilitation of masonry cracks
- ranging from 1/16 inch (1.5 mm) to 1/4 inch (6 mm) wide,
- in both non-structural simple-void applications and
- structural load-bearing applications; cementitious, water-
- based, with synthetic material to enhance penetration and
- bonding.
-
- B. Masonry Injection Grout: JAHN M40 Crack Injection Grout;
- low-viscosity, vapor-permeable single-component injection
- grout for stabilization and rehabilitation of masonry
- cracks ranging from 1/4 inch (6 mm) to 3/8 inch (9 mm)
- wide, in non-structural simple-void applications; mineral-
- based, containing no synthetic polymer bonding agents or
- additives.
-
- C. Masonry Void Injection Grout: JAHN M50 Void Injection
- Grout; low-viscosity, vapor-permeable single-component
- injection grout for stabilization and rehabilitation of
- masonry cracks from 3/8 inch (9 mm) wide, in
- non-structural simple-void applications; mineral-based,
- containing no synthetic polymer bonding agents or
- additives.
- NOTE ** If patching mortar for more than one substrate type
- or mortar color is required in project, add a type
- designation to the following paragraph similar to
- "Stone Patching Mortar Type X:...", duplicate
- entire paragraph as many times as required for
- types in project, assign a type to each substrate
- or color, then edit each paragraph for
- requirements. Coordinate type designations with
- drawings, or in SCHEDULES Article in PART 3 of this
- section.
-
- D. Limestone, Sandstone Patching Mortar: JAHN M70 Stone
- Patching Mortar; vapor-permeable single-component mortar
- for restoration of natural stone surfaces; mineral-based,
- containing no synthetic polymer bonding agents or
- additives.
- NOTE ** Insert existing substrate type in the following sub-
- paragraph, or retain second sub-paragraph if
- schedule is to be used; laboratory-engineered
- formulations are available for limestone,
- sandstone, and precast concrete. Consult
- manufacturer for available formulations for other
- stone types.
- 1. Laboratory-engineered formulation for compatibility
- with existing ___________ substrate.
- 2. Laboratory-engineered formulation for compatibility
- with existing substrate indicated in SCHEDULE Article
- of PART 3 of this section.
- NOTE ** Determine method of color selection; retain one of
- following four sub-paragraphs. Coordinate
- selection method with requirements for Samples in
- SUBMITTALS Article of Part 1.
- 3. Color: Selected from full range of manufacturer's
- available standard colors.
- 4. Color: ____________________.
- 5. Color: Custom color matching Architect-approved
- sample.
- 6. Color: Specified in SCHEDULES Article of PART 3 of
- this section.
-
- E. Anchor Setting Mortar: Jahn M80 Anchor Setting Mortar;
- single-component, vapor-permeable, non-shrink mortar for
- securing anchors and bolts in new or existing masonry
- structures; cementitious water-based material with high
- pH and freeze-thaw resistance, containing no synthetic
- polymer bonding agents or additives.
-
- F. Horizontal Concrete Patch: Jahn M90 Horizontal Concrete
- Patch; single-component, vapor-permeable mortar for
- restoration of structural concrete; cementitious mineral-
- and water-based material with high pH, low carbonation,
- and freeze-thaw resistance, containing no synthetic
- polymer bonding agents or additives.
-
- G. Vertical Concrete Patch: Jahn M90 Vertical Concrete
- Patch; single-component, vapor-permeable mortar for
- restoration of structural concrete; cementitious mineral-
- and water-based material with high pH, low carbonation,
- and freeze-thaw resistance, containing no synthetic
- polymer bonding agents or additives.
- NOTE ** If patching mortar for more than one substrate type
- or mortar color is required in project, add a type
- designation to the following paragraph similar to
- "Brick Patching Mortar Type X:...", duplicate
- entire paragraph as many times as required for
- types in project, assign a type to each substrate
- or color, then edit each paragraph for
- requirements. Coordinate type designations with
- drawings, or in SCHEDULES Article in PART 3 of this
- section.
-
- H. Brick/Terra Cotta Patching Mortar: JAHN M100 Terra Cotta
- Patching Mortar; vapor-permeable single-component mortar
- for restoration of brick and terra cotta surfaces;
- mineral-based, containing no synthetic polymer bonding
- agents or additives.
- 1. Laboratory-engineered formulation for compatibility
- with oven-fired materials.
- NOTE ** Determine method of color selection; retain one of
- following four sub-paragraphs. Coordinate
- selection method with requirements for Samples in
- SUBMITTALS Article of Part 1.
- 2. Color: Selected from full range of manufacturer's
- available standard colors.
- 3. Color: ____________________.
- 4. Color: Custom color matching Architect-approved
- sample.
- 5. Color: Specified in SCHEDULES Article of PART 3 of
- this section.
- NOTE ** If pointing mortar for more than one substrate type
- or mortar color is required in project, add a type
- designation to the following paragraph similar to
- "Stone Pointing Mortar Type X:...", duplicate
- entire paragraph as many times as required for
- types in project, assign a type to each substrate
- or color, then edit each paragraph for
- requirements. Coordinate type designations with
- drawings, or in SCHEDULES Article in PART 3 of this
- section.
-
- I. Masonry Pointing Mortar: JAHN M110 Historic Pointing
- Mortar; vapor-permeable single-component mortar for
- restoration of masonry mortar joints; mineral-based,
- containing no synthetic polymer bonding agents or
- additives.
- 1. Laboratory-engineered formulation for compatibility
- with existing substrate.
- NOTE ** Determine method of color selection; retain one of
- following four sub-paragraphs. Coordinate
- selection method with requirements for Samples in
- SUBMITTALS Article of Part 1.
- 2. Color: Selected from full range of manufacturer's
- available standard colors.
- 3. Color: ____________________.
- 4. Color: Custom color matching Architect-approved
- sample.
- 5. Color: Specified in SCHEDULES Article of PART 3 of
- this section.
-
- J. Marble Patching Mortar: JAHN M120 Marble Patching
- Mortar; vapor-permeable single-component mortar for
- restoration of marble surfaces; mineral-based, containing
- no synthetic polymer bonding agents or additives.
- 1. Laboratory-engineered formulation for compatibility
- with existing marble substrates.
- NOTE ** Determine method of color selection; retain one of
- following four sub-paragraphs. Coordinate
- selection method with requirements for Samples in
- SUBMITTALS Article of Part 1.
- 2. Color: Selected from full range of manufacturer's
- available standard colors.
- 3. Color: ____________________.
- 4. Color: Custom color matching Architect-approved
- sample.
- 5. Color: Specified in SCHEDULES Article of PART 3 of
- this section.
-
- K. Casting Mortar: JAHN M150 Casting Mortar; vapor-
- permeable single-component dry-pack mortar for natural
- stone, terra cotta, or architectural concrete ornamental
- castings; mineral-based, containing no synthetic polymer
- bonding agents or additives.
- 1. Laboratory-engineered formulation to replicate
- appearance and texture of existing substrates.
- NOTE ** Determine method of color selection; retain one of
- following four sub-paragraphs. Coordinate
- selection method with requirements for Samples in
- SUBMITTALS Article of Part 1.
- 2. Color: Selected from full range of manufacturer's
- available standard colors.
- 3. Color: ____________________.
- 4. Color: Custom color matching Architect-approved
- sample.
- 5. Color: Specified in SCHEDULES Article of PART 3 of
- this section.
-
- L. Bluestone, Granite Patching Mortar: JAHN M160 Hardstone
- Patching Mortar; vapor-permeable single-component mortar
- for restoration of granite, bluestone, and other hard
- stone surfaces; mineral-based, containing no synthetic
- polymer bonding agents or additives.
- 1. Laboratory-engineered formulation for compatibility
- with existing hard stone substrates.
- NOTE ** Determine method of color selection; retain one of
- following four sub-paragraphs. Coordinate
- selection method with requirements for Samples in
- SUBMITTALS Article of Part 1.
- 2. Color: Light gray granite.
- 3. Color: Light gray bluestone.
- 4. Color: Custom color matching Architect-approved
- sample.
- 5. Color: Specified in SCHEDULES Article of PART 3 of
- this section.
-
- M. Water: Potable, containing no materials which would
- impair performance or appearance of grout materials.
-
- N. Accessories: Supply accessories specified in
- manufacturer's instructions for project conditions.
-
- 2.3 MIXES
-
- A. Mix mortar materials in accordance with manufacturer's
- instructions; use only mixing methods and equipment
- specified.
-
- B. Add only the amount of water specified in manufacturer's
- instructions to mortar mixes; re-tempering partially-set
- mixes by the addition of water is not permitted.
-
- C. Addition of bonding agents, plasticizers, curing
- compounds, or other materials not specified in
- manufacturer's instructions, is not permitted.
-
-
- PART 3 EXECUTION
-
- 3.1 EXAMINATION
-
- A. Installer's Examination:
- 1. Have installer of this section examine conditions
- under which construction activities of this section
- are to be performed, then submit written notification
- if such conditions are unacceptable.
- 2. Transmit two copies of installer's report to
- Architect within 24 hours of receipt.
- 3. Beginning construction activities of this section
- before unacceptable conditions have been corrected is
- prohibited.
- 4. Beginning construction activities of this section
- indicates installer's acceptance of conditions.
-
- 3.2 PREPARATION
-
- A. Clean surfaces to be treated free of any loose or
- deleterious material which could prevent adhesion or
- otherwise impair performance of cured mortars.
-
- B. Use of bonding agents to prepare existing surfaces is not
- permitted.
-
- 3.3 INSTALLATION
-
- A. Install products of this section in accordance with
- manufacturer's installation instructions.
- NOTE ** Retain the following paragraph if specifying JAHN
- M30 Micro Injection Adhesive.
-
- B. Masonry Injection Adhesive:
- 1. Transverse cracks:
- a. Drill a series of injection ports in center of
- crack; drill ports in downward direction.
- b. Moisten interior of crack immediately before
- injection by flushing with clean water; if
- surface is allowed to dry out before mortar is
- injected, repeat moistening.
- c. Seal cracks, between ports, with removable,
- non-staining clay or masonry masking tape for low-
- pressure applications; patch crack, between
- ports, with mortar of type recommended by
- manufacturer for high pressure applications.
- d. Begin injections at lowest port, continuing
- injection until grout flows freely from next port
- above; seal off initial port and proceed with
- injection at ports above until crack is filled.
- 2. Lateral (delamination) cracks:
- a. Drill a series of injection ports in a square-
- grid configuration on face of substrate; drill
- ports in downward direction.
- b. Moisten interior of crack immediately before
- injection by flushing with clean water; if
- surface is allowed to dry out before mortar is
- injected, repeat moistening.
- c. Begin injections at lower left port, continuing
- injection until grout flows freely from other
- ports; seal off initial port and proceed with
- injection at lower right port.
- d. Seal off ports with removable, non-staining clay
- or masonry masking tape for low- pressure
- applications; seal off ports with mortar of type
- recommended by manufacturer for high pressure
- applications.
- e. Order of injection is lower left-lower
- right-upper left-upper right; continue until
- crack is filled.
- 3. Remove plugs after forty-eight hours; patch ports and
- crack surface, if not previously patched, with mortar
- of type recommended by manufacturer, matching color
- and texture of existing masonry.
- NOTE ** Retain the following paragraph if specifying JAHN
- M40 Crack Injection Grout.
-
- C. Masonry Injection Grout:
- 1. Transverse cracks:
- a. Drill a series of injection ports in center of
- crack; drill ports in downward direction.
- b. Moisten interior of crack immediately before
- injection by flushing with clean water; if
- surface is allowed to dry out before mortar is
- injected, repeat moistening.
- c. Seal cracks, between ports, with removable,
- non-staining clay or masonry masking tape for low-
- pressure applications; patch crack, between
- ports, with mortar of type recommended by
- manufacturer for high pressure applications.
- d. Begin injections at lowest port, continuing
- injection until grout flows freely from next port
- above; seal off initial port and proceed with
- injection at ports above until crack is filled.
- 2. Lateral (delamination) cracks:
- a. Drill a series of injection ports in a square-
- grid configuration on face of substrate; drill
- ports in downward direction.
- b. Moisten interior of crack immediately before
- injection by flushing with clean water; if
- surface is allowed to dry out before mortar is
- injected, repeat moistening.
- c. Begin injections at lower left port, continuing
- injection until grout flows freely from other
- ports; seal off initial port and proceed with
- injection at lower right port.
- d. Seal off ports with removable, non-staining clay
- or masonry masking tape for low- pressure
- applications; seal off ports with mortar of type
- recommended by manufacturer for high pressure
- applications.
- e. Order of injection is lower left-lower
- right-upper left-upper right; continue until
- crack is filled.
- 3. Remove plugs after forty-eight hours; patch ports and
- crack surface, if not previously patched, with mortar
- of type recommended by manufacturer, matching color
- and texture of existing masonry.
- NOTE ** Retain the following paragraph if specifying JAHN
- M50 Void Injection Grout.
-
- D. Masonry Void Injection Grout:
- 1. Transverse cracks:
- a. Drill a series of injection ports 1/4 inch (6 mm)
- to 3/8 inch (9 mm) diameter at center of void;
- drill ports in downward direction.
- b. Moisten interior of void immediately before
- injection by flushing with clean water; if
- surface is allowed to dry out before mortar is
- injected, repeat moistening.
- c. Seal void, between ports, with removable,
- non-staining clay or masonry masking tape for low-
- pressure applications; patch crack, between
- ports, with mortar of type recommended by
- manufacturer for high pressure applications.
- d. Begin injections at lowest port, continuing
- injection until grout flows freely from next port
- above; seal off initial port and proceed with
- injection at ports above until void is filled.
- 2. Lateral (delamination) cracks:
- a. Drill a series of injection ports in a square-
- grid configuration on face of substrate; drill
- ports in downward direction.
- b. Moisten interior of void immediately before
- injection by flushing with clean water; if
- surface is allowed to dry out before mortar is
- injected, repeat moistening.
- c. Begin injections at lower left port, continuing
- injection until grout flows freely from other
- ports; seal off initial port and proceed with
- injection at lower right port.
- d. Seal off ports with removable, non-staining clay
- or masonry masking tape for low- pressure
- applications; seal off ports with mortar of type
- recommended by manufacturer for high pressure
- applications.
- e. Order of injection is lower left-lower
- right-upper left-upper right; continue until
- crack is filled.
- 3. Remove plugs after forty-eight hours; patch ports and
- void surface, if not previously patched, with mortar
- of type recommended by manufacturer, matching color
- and texture of existing masonry.
- NOTE ** Retain the following paragraph if specifying JAHN
- M70 Stone Patching Mortar.
-
- E. Stone Patching Mortar:
- 1. Remove dust, dirt, grease, laitance, and other
- coatings or foreign substance which might prevent
- proper adhesion of mortar.
- 2. Remove loose or deteriorated masonry from the patch
- area, plus an additional 1/4 inch (6 mm) of what
- appears to be sound material, to a minimum depth of
- 1/2 inch (13 mm) using manual or pneumatic cutting
- techniques; square-cut edges of void created,
- maintaining 90-degree angles.
- 3. Where indicated, use threaded stainless steel dowels,
- or other acceptable anchors, to anchor patches.
- 4. Complete surface preparation by washing surface with
- clean water, using natural-bristle brush.
- 5. Completely wet substrate immediately before applying
- mortar by flushing with clean water.
- 6. Apply mortar to glistening wet surface, with no
- pooling water; if surface is allowed to dry out
- before mortar is applied, repeat flushing.
- 7. Build out mortar material out further than surface of
- original substrate; after mortar achieves initial
- set, scrape away excess mortar until desired profile
- is attained.
- 8. To ensure color uniformity, wait until material being
- removed is consistency of dry sand; for rougher
- masonry texture, wait longer before finishing.
- 9. Do not trowel or float surface excessively to achieve
- finish; this can alter texture, porosity, or color of
- mortar material.
- 10. Keep patches moist by water-misting several times a
- day for seventy-two hour period, or less in cool
- weather.
- 11. Where access to patches is not possible, cover
- patches temporarily with plastic sheeting;
- application of plastic sheeting does not alter
- requirements for normal curing techniques.
- NOTE ** Retain the following paragraph if specifying Jahn
- M80 Anchor Setting Mortar.
-
- F. Anchor Setting Mortar:
- 1. Drill holes horizontal or angled in downward
- direction on vertical surfaces; leave walls in
- abraded, open-pore condition.
- 2. Clean holes free of dust, dirt, grease, oil,
- laitance, and loose material which would impair
- performance of mortar using compressed, oil-free,
- air.
- 3. Clean anchors free of rust, then treat with coating
- recommended by manufacturer to prevent rusting; do
- not apply mortar until protective coating for anchors
- is completely dry.
- 4. Completely wet holes immediately before applying
- mortar by flushing with clean water.
- 5. Apply mortar to wet surface, with no pooling water;
- if surface is allowed to dry out before mortar is
- applied, repeat wetting.
- 6. Pour or place mortar into drill hole approximately
- one-half full; insert anchor, twisting, turning, and
- tapping anchor to remove voids or air pockets.
- 7. Fill remainder of cavity with mortar; allow minimum
- two days before applying load to anchor.
- 8. Keep mortar moist by water-misting several times a
- day for seventy-two hour period.
- NOTE ** Retain the following paragraph if specifying Jahn
- M90 Horizontal Concrete Patch.
-
- G. Horizontal Concrete Patch:
- 1. Remove dust, dirt, grease, laitance and other
- coatings or foreign substance which might prevent
- proper adhesion of mortar.
- 2. Remove loose or deteriorated concrete from the patch
- area, plus an additional 1/4 inch (6 mm) of what
- appears to be sound material, to a minimum depth of
- 1/2 inch (13 mm) using manual or pneumatic cutting
- techniques, or mechanical abrasion techniques; square-
- cut edges of void created, maintaining 90-degree
- angles.
- 3. As directed by Architect, cut out reinforcing steel
- which is consumed beyond structural use, and install
- replacement reinforcing.
- 4. Mechanically abrade structurally sound corroded
- reinforcing steel to white metal finish, then treat
- with coating recommended by manufacturer to prevent
- rusting; do not apply mortar until protective coating
- for reinforcing steel is completely dry.
- 5. Complete surface preparation by washing surface with
- clean water, using natural-bristle brush.
- 6. Completely wet substrate immediately before applying
- mortar by flushing with clean water.
- 7. Apply mortar to wet surface, with no pooling water;
- if surface is allowed to dry out before mortar is
- applied, repeat wetting.
- 8. Apply mortar material flush to surface, then finish
- with steel trowel, broom, or float finish, as
- directed by Architect.
- 9. Keep patches moist by water-misting several times a
- day for seventy-two hour period.
- 10. Where access to patches is not possible, cover
- patches temporarily with plastic sheeting;
- application of plastic sheeting does not alter
- requirements for normal curing techniques.
- NOTE ** Retain the following paragraph if specifying Jahn
- M90 Vertical Concrete Patch.
-
- H. Vertical Concrete Patch:
- 1. Remove dust, dirt, grease, laitance and other
- coatings or foreign substance which might prevent
- proper adhesion of mortar.
- 2. Remove loose or deteriorated concrete from the patch
- area, plus an additional 1/4 inch (6 mm) of what
- appears to be sound material, to a minimum depth of
- 1/2 inch (13 mm) using manual or pneumatic cutting
- techniques, or mechanical abrasion techniques; square-
- cut edges of void created, maintaining 90-degree
- angles.
- 3. As directed by Architect, cut out reinforcing steel
- which is consumed beyond structural use, and install
- replacement reinforcing.
- 4. Mechanically abrade structurally sound corroded
- reinforcing steel to white metal finish, then treat
- with coating recommended by manufacturer to prevent
- rusting; do not apply mortar until protective coating
- for reinforcing steel is completely dry.
- 5. Complete surface preparation by washing surface with
- clean water, using natural-bristle brush.
- 6. Completely wet substrate immediately before applying
- mortar by flushing with clean water.
- 7. Apply mortar to wet surface, with no pooling water;
- if surface is allowed to dry out before mortar is
- applied, repeat wetting.
- 8. Build out mortar material out further than surface of
- original substrate; after mortar achieves initial
- set, scrape away excess mortar until desired profile
- is attained.
- 9. Keep patches moist by water-misting several times a
- day for seventy-two hour period.
- 10. Where access to patches is not possible, cover
- patches temporarily with plastic sheeting;
- application of plastic sheeting does not alter
- requirements for normal curing techniques.
- NOTE ** Retain the following paragraph if specifying JAHN
- M100 Terra Cotta Patching Mortar.
-
- I. Brick/Terra Cotta Patching Mortar:
- 1. Remove dust, dirt, grease, laitance and other
- coatings or foreign substance which might prevent
- proper adhesion of mortar.
- 2. Remove loose or deteriorated masonry from the patch
- area, plus an additional 1/4 inch (6 mm) of what
- appears to be sound material, to a minimum depth of
- 1/2 inch (13 mm) using manual or pneumatic cutting
- techniques; square-cut edges of void created,
- maintaining 90-degree angles.
- 3. Where indicated, use threaded stainless steel dowels,
- or other acceptable anchors, to anchor patches.
- 4. Complete surface preparation by washing surface with
- clean water, using natural-bristle brush.
- 5. Completely wet substrate immediately before applying
- mortar by flushing with clean water.
- 6. Apply mortar to wet surface, with no pooling water;
- if surface is allowed to dry out before mortar is
- applied, repeat wetting.
- 7. Build out mortar material out further than surface of
- original substrate; after mortar achieves initial
- set, scrape away excess mortar until desired profile
- is attained.
- 8. Do not trowel or float surface excessively to achieve
- finish; this can alter texture, porosity, or color of
- mortar material.
- 9. Keep patches moist by water-misting several times a
- day for seventy-two hour period.
- 10. Where access to patches is not possible, cover
- patches temporarily with plastic sheeting;
- application of plastic sheeting does not alter
- requirements for normal curing techniques.
- NOTE ** Retain the following paragraph if specifying JAHN
- M110 Historic Pointing Mortar.
-
- J. Masonry Pointing Mortar:
- 1. Remove dust, dirt, grease, laitance and other
- coatings or foreign substance which might prevent
- proper adhesion of mortar.
- 2. Rake out deteriorated mortar to depth required for
- minimum 1/2 inch (13 mm) depth mortar joint, allowing
- for concave joints if project conditions indicate;
- remove loose mortar particles.
- 3. Complete surface preparation by washing surface with
- clean water, using natural-bristle brush.
- 4. Completely wet substrate immediately before applying
- mortar by flushing with clean water.
- 5. Apply mortar to wet surface, with no pooling water;
- if surface is allowed to dry out before mortar is
- applied, repeat wetting.
- 6. Tool mortar joints, using pointing tools and
- techniques required to match adjacent existing mortar
- joints.
- 7. Keep joints moist by water-misting several times a
- day for seventy-two hour period.
- 8. Where access to joints is not possible, cover joints
- temporarily with plastic sheeting; application of
- plastic sheeting does not alter requirements for
- normal curing techniques.
- NOTE ** Retain the following paragraph if specifying JAHN
- M120 Marble Patching Mortar.
-
- K. Marble Patching Mortar:
- 1. Remove dust, dirt, grease, laitance and other
- coatings or foreign substance which might prevent
- proper adhesion of mortar.
- 2. Remove loose or deteriorated masonry from the patch
- area, plus an additional 1/4 inch (6 mm) of what
- appears to be sound material, to a minimum depth of
- 1/2 inch (13 mm) using manual or pneumatic cutting
- techniques; square-cut edges of void created,
- maintaining 90-degree angles.
- 3. Where recommended by manufacturer's instructions, use
- threaded stainless steel dowels, or other acceptable
- anchors, to anchor patches.
- 4. Complete surface preparation by washing surface with
- clean water, using natural-bristle brush.
- 5. Completely wet substrate immediately before applying
- mortar by flushing with clean water.
- 6. Apply mortar to wet surface, with no pooling water;
- if surface is allowed to dry out before mortar is
- applied, repeat wetting.
- 7. Build out mortar material out further than surface of
- original substrate; after mortar achieves initial
- set, scrape away excess mortar until desired profile
- is attained.
- 8. Do not trowel or float surface excessively to achieve
- finish; this can alter texture, porosity, or color of
- mortar material.
- 9. Keep patches moist by water-misting several times a
- day for seventy-two hour period.
- 10. Where access to patches is not possible, cover
- patches temporarily with plastic sheeting;
- application of plastic sheeting does not alter
- requirements for normal curing techniques.
- NOTE ** Retain the following paragraph if specifying JAHN
- M150 Casting Mortar.
-
- L. Casting Mortar:
- 1. Clean and prepare surface of original piece to cast
- mold; perform mold-making should be performed in
- accordance with mold manufacturer's instructions.
- 2. Immediately prior to packing mold, apply non-staining
- mold release agent recommended by mold manufacturer
- to surfaces; include undercut areas.
- 3. Clean mold of foreign materials which could cause
- imperfections; coat mold with non-staining release
- agent recommended by mold manufacturer.
- 4. Scoop 1 to 2 inches (25 to 50 mm) of mixed mortar
- into mold, tamping it into place by hand, ensuring
- that intricate detailings are completely filled,
- particularly in undercut areas; compact mortar by
- tamping with wood rams and rubber mallets as build-up
- of material proceeds, repeating process until mold is
- slightly overfilled.
- 5. Once filled and compacted, screed off excess mortar
- flush with top of mold; cover casting with plastic
- sheeting for approximately twenty-four hours.
- 6. After initial twenty-four hour cure, uncover mold and
- pour clean potable water into casting until point of
- rejection, then recover with plastic; remove casting
- from mold after an additional twenty-four hours,
- keeping casting damp for several additional days to
- further increase final strength of casting.
- NOTE ** Retain the following paragraph if specifying JAHN
- M160 Hardstone Patching Mortar.
-
- M. Bluestone and Granite Patching Mortar:
- 1. Remove dust, dirt, grease, laitance and other
- coatings or foreign substance which might prevent
- proper adhesion of mortar.
- 2. Remove loose or deteriorated masonry from the patch
- area, plus an additional 1/4 inch (6 mm) of what
- appears to be sound material, to a minimum depth of
- 1/2 inch (13 mm) using manual or pneumatic cutting
- techniques; square-cut edges of void created,
- maintaining 90-degree angles.
- 3. Where indicated, use threaded stainless steel dowels,
- or other acceptable anchors, to anchor patches.
- 4. Complete surface preparation by washing surface with
- clean water, using natural-bristle brush.
- 5. Wet substrate immediately before applying mortar by
- flushing with clean water.
- 6. Apply mortar to wet surface, with no pooling water;
- if surface is allowed to dry out before mortar is
- applied, repeat wetting.
- 7. Build out mortar material out further than surface of
- original substrate; after mortar achieves initial
- set, scrape away excess mortar until desired profile
- is attained.
- 8. Do not trowel or float surface excessively to achieve
- finish; this can alter texture, porosity, or color of
- mortar material.
- 9. Keep patches moist by water-misting several times a
- day for seventy-two hour period.
- 10. Where access to patches is not possible, cover
- patches temporarily with plastic sheeting;
- application of plastic sheeting does not alter
- requirements for normal curing techniques.
-
- 3.4 CLEANING
-
- A. Clean up overflow and excess mortar as construction
- activities progress; do not allow mortars to accumulate
- and dry on substrates.
-
- 3.5 PROTECTION OF INSTALLED PRODUCTS
-
- A. Protect installed products of this section from extreme
- heat, freezing, high winds, direct sunlight, or rain
- until materials are completely cured in accordance with
- manufacturer's instructions.
-
- B. Protect installed products of this section from damage by
- subsequent construction activities until Substantial
- Completion.
-
- C. Repair damage in accordance with manufacturer's
- recommendations; replace units which cannot be repaired
- to Architect's acceptance.
- NOTE ** The following sample schedule may be used as a
- guide to locate types of restoration required on
- projects where more than one type of restoration
- material is required, where more than one color is
- required, or where restoration to more than one
- substrate type is required. Delete Article if not
- required.
-
- 3.6 SCHEDULES
-
- A. Stone Patching Mortars:
- 1. Type 1: Patch existing precast concrete retaining
- wall.
- 2. Type 2: Patch existing limestone surfaces at Coach
- House; match color of Architect-approved samples.
-
-
- END OF SECTION
-