I § I § == i == I I § == = I E § § == § = = § == I = == TEXAS TRANSPORTATION INSTITUTE TEXAS HIGHWAY DEPARTMENT COOPERATIVE RESEARCH EFFECTS OF CHEMICAL ADMIXTURES IN CONCRETE AND MORTAR RESEARCH REPORT 70-3 (FINAL) STUDY 2-5-63-70 in cooperation with the Department of Commerce Bureau of Public Roads CHEMICAL ADMIXTURES FOR CONCRETE