干、湿养护下橡胶细集料水泥砂浆压缩破裂及能量演化特性

doi:10.11896/cldb.18120117

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Abstract The uniaxial compression test of rubber cement mortar specimens under curing conditions of 95% and 50% relative humidity was carried out. The fracture mechanism and energy conversion of the specimens during compression deformation were analyzed. The ideal mesoscopic model of uniaxial compression of rubber cement mortar was established. The results showed that the uniaxial compression failure mode of rubber cement mortar is quite different from that of normal cement mortar. It is a ductile failure mode that does not scatter even if it is cracked, rather than the cone-shaped brittle failure mode of normal cement mortar. The evolution process of the fracture energy of the specimen includes four stages of compaction, elastic deformation, rupture development and post-peak softening, accompanied by energy input, energy accumulation, energy dissipation and energy release. Both the decrease of curing humidity and the increase of rubber content will reduce the rate of energy absorption, but the specimen can still continue to accumulate elastic energy in the failure stage, and with the increase of rubber content, the ability of specimens to accumulate elastic energy is stronger. Curing humidity has great influence on the energy storage limit of normal cement mortar, but has little influence on the energy storage limit of rubber cement mortar, the maximum value of the rubber cement mortar U^c₉₅-U^c₅₀ is only about 1/10 of the ordinary cement mortar U^c₉₅-U^c₅₀.

Key words： dry and wet curing rubber cement mortar uniaxial compression fracture mechanism energy evolution

Published: 15 January 2020

CLC number:

TU528

About author:: Rongzhou Yang, a doctoral candidate, Anhui University of Science and Technology, is mainly engaged in the study of mechanical properties, energy and explosion shock of materials.;Ying Xu, a professor, doctoral supervisor, is mainly engaged in the teaching and scientific research of rock impact dynamics, intelligent materials, geotechnical engineering blasting and so on. He is now director of the Science and Technology Industry Department of Anhui University of Science and Technology, outstanding talents of the Ministry of Education in the new century, academic and technical leaders of Anhui Province, top-notch talents in Disciplines of Colleges and Universities in Anhui Province, vice president of the China Blasting Industry Association, chairman of the Committee of Experts on Blasting Materials and Technology of the China Coal Industry Technical Committee, vice chairman of the Enginee-ring Blasting Committee of the China Mechanical Society, vice chairman of the China Blasting Expert Committee, vice chairman of the Anhui Enginee-ring Blasting Association. He has successively presided over 4 key projects and surface projects of the National Natural Science Foundation, 2 special funds for doctoral programs in colleges and universities, 2 key projects of the Ministry of Education, 4 Anhui Province science and technology key projects and natural science foundation projects, 6 other provincial and ministerial level projects, enterprises major science and technology projects more than 30. Won 13 scientific and technological awards at the provincial and ministerial level. More than 200 papers have been published in the Chinese Journal of Rock Mechanics and Engineering, Journal of China Coal Society, Journal of University of Science and Technology of China, Engineering Blasting, Mi-ning and Metallurgical Engineering and domestic and international academic conferences. Published 4 academic monographs such as Theory and Application of Blasting in Underground Engineering. Won the third and fourth Anhui Province Outstanding Youth Science and Technology Innovation Award, Huai-nan City Outstanding Youth Science and Technology Innovation Award, Anhui Province teaching famous teacher, Anhui Province teacher morality stan-dard soldier and the first May Fourth Youth Medal of Huainan City.

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Cite this article:

YANG Rongzhou,XU Ying,CHEN Peiyuan, et al. Compressive Rupture and Energy Evolution Characteristics of Rubber Fine Aggregate Cement Mortar Under Dry and Wet Curing Conditions[J]. Materials Reports, 2020, 34(4): 4049-4055.

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http://www.mater-rep.com/EN/10.11896/cldb.18120117 OR http://www.mater-rep.com/EN/Y2020/V34/I4/4049

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