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impregnations, waxes, foreign particles, and disintegrated materials by mechanical abrasion methods such as sandblasting. 2. If the concrete surfaces are sound and it is only necessary to remove laitance, grease or dust, the Contractor may, with the prior written approval of the Engineer, forego sandblasting and wash the concrete with a degreasing and etching chemical applied in accordance with the manufacturer's (ProSoCo, Inc., Kansas City, Kansas, Sure-Klean Degresser & Etch, or approved equal) written instructions and as stipulated in these Specifications hereinafter. 3. Degreasing and Etching Chemical: Color: Water White; Flash Point: Above 150 Deg.VF; Weight/gallon: 9.0 lbs.; Composition and Materials: A blend of organic and inorganic acids with a special solvent system incorporating wetting agents for emulsification. 4. Application of degrease and etching compound. Prewet concrete surfaces with clean water. Brush concentrated cleaner onto concrete surface. Let stand 3 to 4 minutes and reapply, brushing stained areas vigorously. Rinse off with fresh water applied at a minimum pressure of 800 psi and a minimum volume of five gallons per minute. F. Proportioning/Mixing/Applying Epoxy Compound: 1. Volumetric ratio of bonding compound is 1:1 (B:A). To mix, proportion 1 part B and 1 part A into dean pail. Mix thoroughly for 3 minutes with a steel mixing paddle on low-speed (400 to 600 rpm) drill until blend is a uniform straw color. Mix only that amount of epoxy that can be used in 30 minutes at 73 degrees F. 2. Application for Bonding: a. The area to be overlaid shall be covered with one coat of the epoxy compound applied with long-nap paint rollers, brushes, brooms or by spray. The rate of application shall be 80 sq. ft./gal. maximum or smooth concrete (20 mils). As the concrete increases in roughness, the rate of coverage decreases proportionally. b. While the epoxy compound is still tacky (3-5 hrs. at 73oF) place the concrete. If the bonding compound should harden before the concrete is placed, apply a fresh coat over the hardened coat and proceed. 3. Application for Grouting: To prepare a grout to anchor bolts or level base plates, mix the epoxy compound with granules recommended and supplied by the epoxy manufacturer. The amount granules used should be the maximum amount possible while still maintaining a pourable consistency. The ratio should be approximately 1:1-1/2 by loose volume (Granules). See technical data on anchor bolt grouting and grouting base plates published by the manufacturer. 4. Limitations: a. Do not thin the epoxy bonding compound. Solvents will prevent proper cure. b. Use only oven-dry granules to avoid encapsulation of moisture. Exposure to temperatures (after cure) above 180 degrees F (dry) and 120 degrees F (wet) not recommended. G. WEATHER LIMITATIONS 08/12 03700-4 11-4179