Pore Structure and Mechanical Strength Characteristics of Artificial Sand Aggregate Mortar
LIU Yao1, DENG Hongwei1,*, JIANG Zhen2,*, WANG Peng1, YU Songtao3
1 School of Resources and Safety Engineering, Central South University, Changsha 410083, China 2 School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China 3 School of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
Abstract: With the gradual consumption of natural sand, artificial sand has been widely concerned to replace natural sand as building aggregate. In this work, nuclear magnetic resonance (NMR) technique is used to analyze the pore structure distribution characteristics of five kinds of aggregate graded mortar, and fractal theory is introduced to characterize them. The correlation between aggregate grading characteristics and multi-scale parameters of mortar is studied. The results show that with the increase of aggregate specific surface area, the total porosity of mortar decreases gradually, while the compressive strength and elastic modulus increase gradually. Water-saturated mortar is mainly composed of micropores and movable fluid pores. The formation of pore structure and the change of mechanical characteristics are influenced by both specific surface area and aggregate packing density, among which the strength is mainly influenced by the strength of aggregate itself and the strength of interfacial transition zone.
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2026, Vol. 40 
