Influence of content of coal ash on performance of cement-coal ash slurry

To investigate the influence of content of coal ash on performance of cement-coal ash slurry, slump test and rheological test were conducted to evaluate the slurry rheology comprehensively. In the case of the cement dosage unchanged and 57% concentration of slurry, the change effect of coal ash content in 62.5%~87.5% on rheology, bleeding rate, compressive strength of cement-coal ash slurry were studied. In the case of 57% concentration of slurry and 75% content of coal ash were studied. The results showed that: with the increase of coal ash content, slurry rheology weakened, cohesiveness increased, bleeding rate decreased; with the increase of coal ash content, the compressive strength of all slurry test blocks of different ages decreased, the strength of 3-day changes slowly, 7-day strength variation is the biggest, 3 ~ 7-day hydrated significantly, their strength increase could achieve 37% ~ 42% of the strength of 28-day.