Epoxy Patching Cracks In Limestone

Procedure code:
446010S
Source:
Nationa Capitol Region Specifications - Mad/Cosmos/Tayloe
Division:
Masonry
Section:
Limestone
Last Modified:
03/03/2017

 

 

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

 

Last Reviewed 2017-03-03