Effect of Steel Slag Powder on Hydration Process of Calcium Sulfoaluminate Cement and Thermodynamic Modelling

Abstract

Abstract: The influence of variable steel slag powder content on the hydration behavior of calcim sulfoaluminate cement was investigated through the setting time test, compressive strength test and electrical resistivity test, combined with hydration products analysis and thermodynamic modelling. The results show that with the increase of the mass content of steel slag powder, the initial setting time shows a trend of first extending and then shortening, and reaches the maximum when the content of steel slag is 20%. In 28 d, the compressive strength of cement paste with steel slag powder is lower than the hardened paste without steel slag powder, but at the age of 60 d and 90 d, the compressive strength of cement paste with 40% steel slag powder content is higher than the sample without steel slag powder. The resistivity of steel slag powder and calcium sulfoaluminate cement composite paste increases with the increase of steel slag powder content in the initial hydration stage, and decreases with the increase of steel slag powder content in the late hydration stage (after about 3 h). In the age of 1 d, the hydration reaction of steel slag powder occurs in the sample with 40% steel slag powder content, which makes the hydration rate of cement paste reach the maximum in the deceleration period. According to thermodynamic modelling results, in the sample mixes with 40% steel slag powder, C₂S began to react after 10 h, forming C₂ASH₈ after 168 h. When the steel slag content is more than 15%, with the increase of the steel slag powder content, the production of ettringite and AH₃ gradually decreases, and the production of C₂ASH₈ gradually increases.

Key words: calcium sulfoaluminate cement, steel slag powder, compressive strength, electrical resistivity, hydration product, hydration kinetics, thermodynamic modelling

CLC Number:

TQ172

LIAO Yishun, HUANG Weifeng, LI Hao, WANG Sichun. Effect of Steel Slag Powder on Hydration Process of Calcium Sulfoaluminate Cement and Thermodynamic Modelling[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2376-2383.

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