Negative Poisson's Ratio Design and Static Load Characteristics of Foam Concrete
MA Yanxuan1,2, XU Yaqian1, YU Xia1, ZHAO Fei1, LI Mengyao1, ZHANG Peng1, PENG Shuai3
1 School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China 2 State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China 3 Wudongde Project Construction Department, China Three Gorges Projects Development Co., Ltd., Kunming 650000, China
Abstract: The auxetic material has attracted much attention in the field of materials due to its special properties. The application of negative Poisson's ratio in the design of foam concrete can make it possess good mechanical properties and energy absorption effect. In this experiment, foam concrete was prepared by chemical foaming method, and three kinds of foam concrete with different pore shapes were obtained, repectively namely, closed-hole foam concrete, through hole foam concrete, and inner concave foam concrete. The dry density and pore structure parameters of foam concrete were characterized by image method, and the static compression and flexural strength of foamed concrete were tested by a universal testing machine. The regional deformation behavior and Poisson's ratio of foam concrete were studied by CCD camera and digital speckle correlation met-hod (DSCM). The results show that the porosity, pore size and dry density of foam concrete are related to the amount of foaming agent. The more the amount of added foam, the smaller dry density, and the larger porosity and pore size. The compressive strength and flexural strength of foam concrete are also related to the amount of foaming agent, and the strength decreases with the increase of the amount of added foam. But the foam concrete with inner concave holes has higher compressive strength and flexural strength. The fracture energy of inner concave foamed concrete under compression is 33.9×103 J/m3, and its value is 44.9% higher than that of ordinary closed-hole foam concrete. DSCM indicated that it had an obvious shrinkage effect during compression. DSCM calculated that the shrinkage ratio of foam concrete with inner concave hole could reach 37.5% of closed-hole foam concrete, and the maximum negative Poisson's ratio could reach -3.7 during compression.
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2021, Vol. 35 
