WANG Jianghua1,2,3,4, XUE Cuizhen1,2,3,4,*, ZHANG Yu1,2,3,4, ZHANG Yunsheng1,2,3,4,*, QIAO Hongxia1,2,3,4, HU Xiangnan1,2,3,4, ZHAO Yang1,2,3,4
1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Western Advanced Civil Engineering Materials Innovation Research Center, Lanzhou 730050, China 3 Gansu Advanced Civil Engineering Materials Engineering Research Center, Lanzhou 730050, China 4 Gansu Research Base of Key Laboratory of High Performance Civil Engineering Materials, Lanzhou 730050, China
Abstract: In this study, the characteristics of ground granite powder with different times (0, 20, 40, and 60 min) were studied. The effects of grinding time and amount of granite powder (0%, 5%, 10%, 15%, and 20%) on the drying shrinkage of mortar were investigated. Scanning electron microscope and TG-DSC were used to analyze the microstructure and hydration products of granite stone powder mortar. Finally, gray entropy analysis was used to observe the key particle parameters affecting drying shrinkage; this was done by determining the gray entropy correlation between the particle parameters of granite powder and the 28 d drying shrinkage activity index of mortar. The results indicate that the highest proportion of the particle sizes in the range of 56.4—63.2 μm in the raw granite powder is 5.1%. After crushing, the proportions of the particle sizes in the ranges of 17.8—20.0, 22.4—25.2, and 15.9—17.8 μm are 3.5%, 3.3%, and 3.4%, respectively. With increasing grinding time, the drying shrinkage resistance first decrease, then increase and then decrease. Compared with the drying shrinkage rate of the reference mix, those of 5%-, 10%-, and 15%-stone-powder-added mortar mixes (ground for 40 min) at 28 d are lower by 11.9%, 35.2%, and 45.3%, respectively. Drying shrinkage decreased by 1.9% when the content increase to 20%. Gray entropy analysis shows that the particle size corresponding to the cumulative distribution of the particle size of the stone powder reaches 10%. Specific surface area and the particle content of 20~40 μm are found to be the key parameters affecting the drying shrinkage performance of mortar. The area average particle size and the scope of particles >60 μm had significantly minor effects on the drying shrinkage performance of mortar.
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2023, Vol. 37 
