ASTM C1228Full Name ASTM C1228 – Standard Practice for Preparing Coupons for Flexural and Washout Tests on Glass Fiber Reinforced ConcreteScope This practice covers preparation of test coupons to be used in tests of plant manufactured thin-section glass fiber reinforced concrete (GFRC).Keywords coupons; flexural tests; glass fiber content; glass fiber reinforced concrete (GFRC); strengthResourcesASTM International Website: ASTM C1228 Need more info?