Effect of Steam Curing on Compressive Strength of Fly Ash Concrete

Abstract

The effects of steam curing conditions, such as the presteaming period and the maximum curing temperature, on the compressive strength of fly ash concrete were investigated and compared with those of plain concrete in order to use fly ash for precast concrete products. The replacement ratios of cement by fly ash were 0,20,and 40%. The presteaming period (2,4 and 6 hours) and maximum temperature during steam curing (65 and 80 degrees Centigrade) were varied in this test. The compressive strength of phi 100 x 200 mm cylinder specimens were determined at the ages of 1,7 and 28 days. As a result of this investigation, the adoption of a longer presteaming period of 4 to 6 hours and a maximum curing temperature of from 65 to 80 degrees Centigrade is recommended for the steam curing of fly ash concrete to obtain higher strength at various ages.