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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2023, Vol. 42 ›› Issue (12): 4360-4367.

• Solid Waste and Eco-Materials • Previous Articles     Next Articles

Autogenous Shrinkage Performance Evolution Law of Mortar Mixed with Granite Powder

CHEN Mei1, HAN Yixuan2, ZHANG Yunsheng3, HU Xiangnan3, XUE Cuizhen3, WANG Jianghua3   

  1. 1. Highway Industry Development Center of Jiangsu Provincial Transportation Department, Nanjing 210004, China;
    2. State Key Laboratory of Safety and Health of Long Bridges in Service, Sujiaoke Group Co., Ltd., Nanjing 211112, China;
    3. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2023-07-03 Revised:2023-08-14 Online:2023-12-15 Published:2023-12-12

Abstract: In order to improve the utilization rate of granite powder, based on the analysis of the influence of grinding time on particle characteristics of granite powder, the influences of granite powder dosage and grinding time on autogenous shrinkage performance of mortar were systematically studied. The main factors affecting the self shrinkage performance of mortar with granite powder were analyzed using grey entropy method. Finally, microscopic testing methods were used to reveal the mechanism of the influence of granite powder on self shrinkage performance of mortar. The result show that with the increase of grinding time, the fineness of stone powder particles gradually increases, the content of particles with a particle size less than 10 μm increases, the content of particles with a particle size greater than 40 μm decreases, and the self-contraction deformation of granite-doped stone powder mortar gradually increases. With the increase of granite powder content, the self shrinkage deformation of mortar shows a pattern of increasing first and then decreasing. Appropriately reducing the dosage of granite powder particles with particle size less than 20 μm is beneficial for improving the self shrinkage activity index of mortar mixed with granite powder. The granite powder mainly affects the type and quantity of hydration products inside mortar, thereby affecting its self shrinkage deformation law.

Key words: granite powder, mortar, autogenous shrinkage, particle parameter, microstructure, hydration product, gray entropy analysis

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