Hydration heat of compound cementitious materials in HPEC

摘要

GB2022-80 is adopted to measure hydration heat of multiple compound cementitious materials. The results show that different auxiliary binding materials (such as expansive agent, fly ash, blast furnace slag) induce absolute temperature rise decreasing sharply and temperature appearance moment delayed. Particularly, when two of these materials are applied together, it is more effective. CSA increases exothermic rate. And blast furnace slag, low calcium fly ash and high calcium fly ash decrease hydration heat at early age. Low calcium fly ash has larger ability to diminish hydration heat than high calcium fly ash, and high calcium fly ash even larger than blast furnace slag. This experience is also effective when CSA exists or CSA and mineral admixture are applied together. Expansive agent and mineral admixture employed together has the capability to decreasing hydration heat at early age greatly, which is conducive for diminishing cracks of HEPC.