Effect of Starch-based Hydration Temperature Rise Inhibitors on Hydration of Cement-Fly Ash Composite Cementitious Materials

This article mainly studies the effect of starch-based hydration temperature rise inhibitor (TRI) on the setting time, compressive strength, hydration heat release of composite cementitious materials, and compared with pure cement. The effect mechanism is analyzed by comparing the adsorption performance of TRI on cement and fly ash, and the changes of hydration products. The results show that the setting time is extended, and the early strength is also reduced with the increasing of TRI dosage. The TRI has negative influence on the later age strength(60d) of composite cementitious system, while does not affect the later age strength of pure cement system. TRI could effectively decrease the hydration peaks in three systems, thus distribute the heat release over time. Compared with fly ash, TRI intends to absorb on the surface of cement, which results that per cement adsorbs more TRI in composite system to reduce the heat peak more effectively. At the same time, the setting time is extended more, the early strength loss is increased. TRI does not affect the final reaction degree of pure cement system, but it may delay the volcanic reaction of fly ash, thus reduce the later strength of composite system. © 2021, Materials Review Magazine. All right reserved.