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Historic Preservation - Technical Procedures

Spectitle:

Epoxy Patching Cracks In Limestone

Procedure code:

0446010R

Source:

Nationa Capitol Region Specifications - Mad/Cosmos/Tayloe

Division:

Masonry

Section:

Limestone

Last Modified:

08/13/2013

Details:

Epoxy Patching Cracks In Limestone



EPOXY PATCHING CRACKS IN LIMESTONE


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on patching cracks in
         limestone using an epoxy resin.  This type of repair is
         suited for dormant (inactive) cracks no larger than 3/8"
         wide.

    B.   See 01100-07-S for general project guidelines to be
         reviewed along with this procedure. These guidelines
         cover the following sections:

         1.   Safety Precautions

         2.   Historic Structures Precautions

         3.   Submittals

         4.   Quality Assurance

         5.   Delivery, Storage and Handling

         6.   Project/Site Conditions

         7.   Sequencing and Scheduling

         8.   General Protection (Surface and Surrounding)

         These guidelines should be reviewed prior to performing
         this procedure and should be followed, when applicable,
         along with recommendations from the Regional Historic
         Preservation Officer (RHPO).

1.02 QUALITY ASSURANCE

    A.   Contractor: A skilled firm with not less than five (5)
         years experience in masonry repointing and restoration.
         The Contractor shall be required to submit references for
         five (5) successfully completed projects of similar
         nature.

    B.   Source of Material: Obtain materials for stone
         restoration from a single source for each type of
         material required, to ensure match of quality, color,
         pattern, and texture.
   
1.03 PROJECT/SITE CONDITIONS

    A.   Environmental Requirements:  Perform work only in dry and
         otherwise favorable weather conditions. Protect repaired
         masonry against freezing or excessively rapid drying for
         at least 48 hours after being laid. Do not repoint mortar
         joints or repair masonry unless air temperatures are
         between 40 F (4 C) and 80 F (27 C) and will remain so for
         at least 48 hours after completion of work.


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   Akemina 
         www.akemina.com

    B.   Euclid Chemical Company
         www.euclidchemical.com

    
2.01 MATERIALS

    A.   Epoxy-Based Stone Repair Adhesive: A commercially
         available, two component, moisture insensitive, high
         modulus, low viscosity, epoxy resin-formulated for
         penetrating deep into thin masonry cracks, such as
         "Akepox 1005 or 1006" (Akemina), "Eucopoxy Injection
         Resin" (Euclid Chemical Company),  or approved equal.

    B.   Single Source Responsibility: Provide epoxy resin,
         hardener and solvent produced by the same manufacturer.

    C.   Acetone (C3H6O):

         1.   A volatile fragrant flammable liquid ketone used
              chiefly as a solvent and in organic synthesis.

         2.   Other chemical or common names include Dimethyl
              ketone; Propanone

         3.   Potential Hazards:  VOLATILE AND FLAMMABLE SOLVENT

         4.   Available from chemical supply house or hardware
              store.

    D.   Limestone Dust

    E.   Clean, potable water

2.03 EQUIPMENT

    A.   Syringe

    B.   Stiff bristle brushes (non-metallic)


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:

         1.   Take whatever precautions are necessary to protect
              the existing building from damage resulting from
              work under this section.

         2.   Prevent mortar and patching compounds used in
              repointing and repair work from staining face of
              surrounding masonry and other surfaces. Remove
              immediately mortar and patching compounds in
              contact with exposed masonry and other surfaces.

         3.   Improper use of chemicals may constitute a health
              hazard. Refer to manufacturer's Material Safety
              Data Sheets for hazard data, special protection for
              use and precautions to be taken in handling and
              storage. Comply with manufacturer's recommendations
              for proper use of chemicals.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Thoroughly clean dust, dirt and debris from crack.

    B.   Wipe surfaces to be bonded with acetone and allow to dry
         thoroughly.

    C.   Thoroughly and completely mix resin and hardener (2
         minutes). Mix at low speeds to minimize entrapped air.
         Blend the epoxy adhesive to match color matrix of
         adjacent limestone by adding color limestone dust or
         pigment.

    D.   Mask stone surfaces adjacent to crack to prevent staining
         of the limestone during repair operation.

    E.   After mixing, inject epoxy into cracks with a syringe and
         allow to seep in. Continue to apply material until crack
         is full. Sprinkle limestone dust on epoxy adhesive to
         mask crack.

    F.   Clean tools and any tape residue with acetone or solvent
         specifically formulated for the particular product used.

                         END OF SECTION
 


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