Effects of Quicklime-Sodium Carbonate Content and Slag Activity on Cracking Resistance of Alkali-activated Slag Mortar
ZHAO Xiaowen1, ZHANG Jianmei1, CHEN Xudong2, JI Tao1,*
1 College of Civil Engineering, Fuzhou University, Fuzhou 350108, China 2 College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
Abstract: Alkali-activated slag mortar was prepared using quicklime and sodium carbonate (the molar ratio of 1∶1) as activators. The effect of quicklime and sodium carbonate content (namely Na2O content, 2.5%, 4.5%, 6.5% and 8.5%) and slag activity (depending on the chemical composition and fineness, etc.) on the splitting tensile strength, strain of interior steel ring, circumferential tensile stress and cracking resistance of alkali-activated slag mortars (AM) was investigated. It is found that the cracking resistance of Portland cement mortars is better than that of AM; with the increase of Na2O content, the splitting tensile strength and cracking resistance increase firstly and then decrease. When the Na2O content is 6.5%, the cracking resistance is the best; with the increase of slag activity, the splitting tensile strength of AM increases, but its cracking resistance decreases.
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2022, Vol. 36 
