Mechanical Properties and Microstructure Characteristics of Cementless Ultra-high Strength Mortar Activated by Calcium Carbide Residue
WANG Pengju1, PENG Yucheng2, DING Hong3,4, WANG Wei4, PENG Gaifei1,*
1 Faculty of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China 2 Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100024, China 3 Advanced Construction Materials Limited Liability Company, Beijing Construction Engineering Group, Beijing 100015, China 4 Beijing Construction Engineering Hengjun Engineering Testing Co., Ltd., Beijing 102615, China
Abstract: In order to improve the economic and environmental benefits of cementless ultra-high performance concrete (UHPC), ground granulated blast furnace slag (GGBFS), silica fume (SF) or both were used as precursors, activated by calcium carbide residue to prepare a series of cementless mortars. The effect of precursors and curing regimes on compressive strength, hydration products and microstructure of cementless mortars was investigated. Results show that CCR activated GGBFS mortars obtained higher fluidity and compressive strength than CCR activated SF mortars. With addition of SF, the compressive strength of CCR activated GGBFS-SF mortars under combined curing reached 132.2 MPa. The pozzolanic reaction between Ca(OH)2 provided by GGBFS hydration and CCR and SiO2 provided by SF in the matrix was significantly acce-lerated by thermal curing, generated a large amounts of C-(A)-S-H gel and a small amounts tobermorite crystals and xonotlite crystals, reduced the porosity and helped the cementless mortar obtained ultra-high compressive strength.
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2025, Vol. 39 
