Effect of Fly Ash on the Temperature Rise in Concrete

摘要

One of the most serious problems facing the concrete industry in Texas is the effect of high temperatures in concrete on concrete performance. Hot weather and the hydration of cement produce high temperature conditions. One of the major problems associated with high temperatures in concrete is the potential for thermal cracking. The temperature rise can be lowered through the use of mineral admixtures such as fly ash. The report is the first in a comprehensive study which addresses the effect of fly ash on the temperature rise in concrete and the thermal gradient in concrete resulting from the hydration of cement. The report presents the results from a research program in which the temperature rise in mortar samples and the thermal gradient in concrete are examined. The results of the study show that the replacement of cement with Type A fly ash results in a reduction in the temperature rise in concrete, whereas replacement of cement with Type B fly ash has no significant effect on the temperature rise in concrete.