Effect of Alkali on Hydration and Hardening of Sulfoaluminate Cement-Fly Ash System
SHEN Yan1,*, ZHU Hangyu2, GONG Yongfan2, HE Qiang3
1 College of Building and Materials, Chongqing College of Electronic Engineering, Chongqing 401331, China 2 College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China 3 Chongqing University Construction Engineering Quality Inspection Co., Ltd., Chongqing 400045, China
Abstract: As a trace component, alkali has an important impact on cement performance. In this work, the effect of alkali on the setting time, compressive strength, volume stability and hydration products of sulfoaluminate cement-fly ash system were studied. The results show that the setting time first decreases and then increases with the increase of Na2SO4 content. When the content of Na2SO4 increases to 1.5% and 2%, the setting time of sulfoaluminate cement-fly ash system exceeds that of the blank cement. High content of Na2SO4 results in the decrease of the early strength of sulfoaluminate cement-fly ash system. The addition of Na2SO4 can improve the later strength of the system, and restrain the reduction of later strength. The increase of Na2SO4 content can increase the expansion ratio, and high content of Na2SO4 results in the increase of shrinkage ratio. Low content of Na2SO4 has no significant effect on the formation of ettringite at early ages. However, high content of Na2SO4 inhibits the formation of ettringite at early ages. The crystal morphology of ettringite at early ages is also affected by high content of Na2SO4.
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2023, Vol. 37 
