Effects of Retarders on Hydration and Properties of High-Belite Calcium Sulphoaluminate Cement

Abstract

Abstract: High-belite calcium sulphoaluminate (HB-CSA) cement is a new type of low-carbon cement with low shrinkage characteristics. Aiming at the problem that the setting and hardening of HB-CSA cement is difficult to control, the effects of two retarders, aminotri methylenephosphonic acid (ATMP) and sodium gluconate (SG), on the hydration and retardation response of HB-CSA cement were investigated. Each of the retarder compounded has a different effect on the early-age hydrate assemblage, as shown by quantitative X-ray diffraction, thermal conductivity isothermal calorimeter, scanning electron microscopy. The results show that ATMP significantly retards hydration of HB-CSA cement, prolongs the setting time, and improves HB-CSA cement mid-late strength, while the retardation effect of SG is limited. The combination of two retarders with PCE delays the hydration heat release rate differently to inhibit the early hydration product (ettringite)-forming reaction. Furthermore, the morphology of ettringite is altered depending on the type of retarder used.

Key words: high-belite, calcium sulfoaluminate cement, aminotri methylenephosphonic acid, sodium gluconate, ettringite, retardation

CLC Number:

TQ172

TANG Ruifeng, WANG Ziming, LAN Mingzhang, CHEN Zhifeng. Effects of Retarders on Hydration and Properties of High-Belite Calcium Sulphoaluminate Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3763-3769.

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