Effect of Lithium Salt on Function of Borax in Sulphoaluminate Cement

Abstract

Abstract: In the practical engineering application of sulphoaluminate cement, borax is commonly used as a retarder. However, borax can cause excessive retardation of sulphoaluminate cement. In order to control the setting time of sulphoaluminate cement, lithium salt was added to sulphoaluminate cement to control the effect of borax. The setting time, compressive strength and hydration products were analyzed. The results show that lithium hydroxide significantly shorten the setting time of the sulfoaluminate cement with 0.1% borax. The addition of lithium hydroxide reduces the compressive strength. In the case of 0.5% borax, the setting time of cement is greatly shortened due to the addition of more than 0.07% lithium hydroxide. The early compressive strength increases slightly with the increase of lithium hydroxide content, and the later compressive strength decreases slightly. The addition of lithium salt does not change the type of hydration products of sulphoaluminate cement with borax. In the case of 0.5% borax, the intensities of ettringite peaks decrease significantly after 1 d of hydration, while the intensities is not influenced at 28 d.

Key words: sulphoaluminate cement, borax, lithium salt, setting time, compressive strength, hydration product

CLC Number:

TU525

SHEN Yan, ZHU Hangyu, WANG Peifang, ZHANG Wei. Effect of Lithium Salt on Function of Borax in Sulphoaluminate Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 377-383.

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