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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2022, Vol. 41 ›› Issue (9): 3008-3015.

• Cement and Concrete • Previous Articles     Next Articles

Effect and Mechanism of Sodium Lactate on Strength of Supersulfate Cement

WU Shuanglei1, JI Junrong2, ZHOU Weijie1, CHEN Yu1, ZHOU Runduo1, ZHOU Zhou2, CHEN Huxing1   

  1. 1. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;
    2. Chongzuo South Cement Co., Ltd., Chongzuo 532201, China
  • Received:2022-04-24 Revised:2022-06-23 Online:2022-09-15 Published:2022-09-27

Abstract: Supersulfate cement is a kind of resource saving and environmentally friendly cementitious material, but its application is limited because of its low strength in early stage. In order to improve its early strength, the effect of sodium lactate content on the strength of supersulfate cement was studied, the ion concentration, hydration products and microstructure were analyzed by ICP-OES, MIP, XRD and SEM, and the related mechanism was discussed. The results show that the strength of supersulfate cement, especially the early strength, is improved by adding a small amount of sodium lactate, but it is detrimental to the strength when adding too much. Considering the increasing effect of early strength and late strength, the suitable content of sodium lactate is about 0.25% (mass fraction). The main reasonwhy sodium lactate improves the strength of supersulfate cement is that sodium lactate can promote the dissolution of slag, accelerate the formation of ettringite and C-S-H, and thus improve the microstructure of cement.

Key words: supersulfate cement, sodium lactate, strength, ion concentration, ettringite, microstructure

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