Influence of the Variation of Cement Source on Hot Weather Concreting

Abstract

This work studied effects of varying cement source on fresh and hardened concrete properties under hot weather conditions. For the 7 ASTM Type II cements studied, the same mix proportioning was adopted at a mixing temperature of 95 deg F with a constant dosage of water reducing and air entraining admixtures. Properties of fresh concrete including slump loss over an extended mixing period of 90 minutes, air content, and setting times are reported. Hardened properties including compressive strength development and rapid chloride permeability test data are also reported. Results indicate that the rate of slump loss and setting times are affected by cement compound composition, calcium sulfate content, and calcium sulfate type. Compressive strength, under hot mixing conditions, is found to be dependent on composition, fineness, and morphology of cement compounds.