Specification:Removing epoxy adhesives and elastomeric joint sealant smears and overruns from concrete

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=GENERAL=

SUMMARY
 This procedure includes guidance on removing cured and uncured epoxy adhesives and elastomeric joint sealant smears and overruns from concrete using organic solvents and/or mechanical methods. Safety Precautions:  THE ORGANIC SOLVENTS LISTED ARE POISONOUS, CARCINOGENIC OR FLAMMABLE. GOOD VENTILATION MUST BE PROVIDED WHEREVER ANY SOLVENT IS USED. USE RESPIRATORS WITH SOLVENT FILTERS. Provide adequate clothing and protective gear for workers. Respirators with solvent filters shall be used when using chemicals. Provide adequate ventilation. Before starting the job, provide adequate emergency wash solutions (i.e. water, soap and towels) at close proximity to job site.   See Specification:General project guidelines for general project guidelines to be reviewed along with this procedure. These guidelines cover the following sections:  Safety Precautions</li> Historic Structures Precautions</li> Submittals</li> Quality Assurance</li> Delivery, Storage and Handling</li> Project/Site Conditions</li> Sequencing and Scheduling</li> General Protection (Surface and Surrounding)</li> </ol> </li> </ol> These guidelines should be reviewed prior to performing this procedure and should be followed, when applicable, along with recommendations from the State Historic Preservation Officer (SHPO). =PRODUCTS=

MANUFACTURERS
<ol type="A"> Diedrich Technologies, Inc. 7373 South 6th Street Oak Creek (Milwaukee), WI 53154 800/323-3565 or 414/764-0058</li> ProSoCo, Inc. 755 Minnesota Avenue P.O. Box 1578 Kansas City, KS  66117 800/255-4255 or 913/281-2700</li> </ol>

MATERIALS
<ol type="A">

Organic solvent:  Toluene (C7H8): A liquid, aromatic hydrocarbon that resembles benzene but is less volatile, flammable and toxic. It is produced commercially from light oils from coke-oven gas and coal tar and from petroleum.</li> Other chemical or common names: Toluol.</li> <li>Potential hazards: TOXIC AND FLAMMABLE.</li> <li>Available from chemical supply house, hardware store, paint store or printer's supply distributor.</li> </ol> </li> <li>Xylene (C8H10): <li>Any of three toxic, flammable, oily, isomeric, aromatic hydrocarbons that are di-methyl homologues of benzene and are obtained from wood tar, coal tar, or petroleum distillates. Also a mixture of xylene and ethyl-benzene used chiefly as a solvent.</li> <li>Other chemical or common names: Xylol; P-xylene; 1,4-dimethyl benzene.</li> <li>Potential hazards: TOXIC AND FLAMMABLE</li> <li>Available from chemical supply house, hardware store, paint store or printer's supply distributor.</li> </ol> </li> </ol> </li> <li>Scouring powder</li> <li>Commercial stripper such as "Sure Klean 859 Stripper" (ProSoCo, Inc.), "Diedrich 505 Special Coatings Stripper" or "Diedrich 505X Dry Strip" (Diedrich Technologies, Inc.), or approved equal.</li> <li>Clean, soft rags</li> <li>Clean, potable water</li> </ol>

EQUIPMENT
<ol type="A"> <li>Stiff scrapers</li> <li>Stiff, natural or nylon bristle brushes (no wire) and/or rollers</li> </ol> =EXECUTION=

PREPARATION
<ol type="A"> <li>Protection: Protect surrounding surfaces from run-off of chemicals and water solutions.</li> </ol>

ERECTION, INSTALLATION, APPLICATION
<ol type="A"> <li>For Uncured Epoxy or Joint Sealant Smears: <ol> <li>Swab excess epoxy or joint sealant with solvent such as toluene or xylene, or as recommended by manufacturer of material.</li>

<li>Rinse area thoroughly with clean, clear water to remove all traces of chemical.</li> <li>If necessary, scrub area with scouring powder using a nylon or natural stiff bristle brush.</li> <li>Rinse area thoroughly with clean, clear water, and allow to dry.</li> <li>Repeat the process to achieve the desired level of cleanliness.</li> </ol> </li> <li>For Cured Epoxy or Joint Sealant Smears: <ol> <li>Scrape thickest areas of cured joint sealant with stiff scrapers.</li>

<li>Remove remaining sealant and/or epoxy using a commercial stripper. Follow manufacturer's instructions for application and safety.</li> <li>If asphaltic joint sealants have been used see procedure 03710-05-R, "Removing Asphalt Stains from Concrete".</li> </ol> </li> </ol>