Effect of Ethylenediamine Tetramethylene Phosphonic Acid on EarlyHydration-Hardening of High Belite Calcium Sulfoaluminate Cement

doi:10.16552/j.cnki.issn1001-1625.2024.1614

Abstract

Abstract: Aiming at the problem of fast setting time and poor workability of fast-setting and fast-hardening high belite calcium sulfoaluminate (HB-CSA) cement, the effect of ethylenediamine tetramethylene phosphonic acid (EDTMP) on the setting time, fluidity and mechanical properties of HB-CSA cement was investigated by hydration heat, X-ray diffraction, thermogravimetric and mercuric pressed tests. The mechanism of action of EDTMP in HB-CSA cement was analyzed. The results show that EDTMP can effectively retard the setting time of calcium sulfoaluminate cement and improve the fluidity. When the EDTMP contnet is 1.00% (mass fraction), it can prolong the initial setting time of HB-CSA cement to 62 min and prolong the final setting time of HB-CSA cement to 76 min. EDTMP can inhibit the reaction between anhydrous calcium sulfoaluminate (C₄A₃$\overline{\mathrm{s}}$) mineral and gypsum phase of HB-CSA cement in order to inhibit the rapid generation of ettringite (AFt), which is an early hydration product of cement, so that HB-CSA cement retarding can be achieved.

Key words: ethylenediamine tetramethylene phosphonic acid, high belite calcium sulfoaluminate cement, ettringite, hydration, retardation

CLC Number:

TQ172

TANG Ruifeng, WANG Ziming, CUI Suping, ZHAO Sixue, RUI Yafeng. Effect of Ethylenediamine Tetramethylene Phosphonic Acid on EarlyHydration-Hardening of High Belite Calcium Sulfoaluminate Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 1988-1995.

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