3754.1SCOPE
Provide poly-alpha methyl styrene (AMS) liquid membrane curing compounds for spray application on Portland cement concrete surfaces exposed to the air.
3754.2REQUIREMENTS
Provide membrane-curing compound meeting the following requirements:
most current approved lots and batches with product expiration dates are available from the APL
Program, including pre-testing of Materials by the manufacturer
Forming Compounds for Curing Concrete, for the type required by the Contract
manufacture date
properties of Table 3754.2-1 Table 3754.2-1 Requirements for 3754, “Poly-Alpha Methyl Styrene (AMS) Membrane Curing Compound” Properties Range Total solids, percent by weight of compound ≥ 42 Percent reflectance in 72 hours (ASTM E1347†) ≥ 65 Loss of Water, kilograms/square meter in 24 hours (ASTM C156‡) ≤ 0.15 Loss of Water, kilograms/square meter in 72 hours (ASTM C156‡) ≤ 0.40 Settling Test, millimeter/100 milliliter in 72 hours* ≤ 2 V.O.C. Content, grams/Liter ≤ 350 Infrared Spectrum, vehicleǁ 100 percent α methyl styrene * Test in accordance with the method on file at the Materials Laboratory. ǁ Match the infrared scan for the dried vehicle from the curing compound to the infrared scan on file at the Materials Laboratory. † ASTM E1347, Standard Test Method for Color and Color Difference Measurement by Tristimulus Colorimetry ‡ ASTM C156, Standard Test Method for Water Loss [from a Mortar Specimen] Through Liquid Membrane-Forming Curing Compounds for Concrete
3754.3SAMPLING AND TESTING
Provide samples for testing meeting the requirements of the Schedule of Materials Control . Test the Material at an application rate of 200 square feet per gallon.
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