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- 混凝土与制品
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孔隙率对混凝土力学性能及能量耗散的影响研究
作者：常西亚，卢爱红，胡善超，王永绥，张倞，姜瑞丰，赵振昊
（中国矿业大学 力学与土木工程学院，江苏 徐州 221116）
摘要：为了探究海绵城市建设中孔隙率变化对混凝土材料力学性能和能量耗散的影响，设计了孔隙率分别为12%、15%、18%、21%的混凝土，并利用万能试验机对4种孔隙率混凝土进行单轴压缩试验，得到应力-应变曲线。试验结果表明：随着孔隙率的增大，混凝土的弹性模量、峰值应力、泊松比逐渐降低，峰值应变逐渐增大，混凝土的总吸收能和弹性能逐渐减小，耗散能呈现先减小后增大的趋势。
关键词：混凝土；孔隙率；力学性能；能量耗散
中图分类号：TU528.01 文献标识码：A 文章编号：1001-702X（2019）04-0012-04
Influence of porosity on mechanical properties and energy dissipation of concrete
CHANG Xiya，LU Aihong，HU Shanchao，WANG Yongsui，ZHANG Jing，JIANG Ruifeng，ZHAO Zhenhao
（School of Mechanics and Civil Engineering，China University of Mining and Technology，Xuzhou 221116，China）
Abstract：In order to explore the influence of the porosity change on the mechanical properties and energy dissipation of concrete materials in the construction of sponge city，we design concrete with porosity of 12%，15%，18% and 21% respectively.
Uniaxial compression tests are performed on the four kinds of porosity concrete by using a universal testing machine. The stress-strain curvesis obtained from these tests. The following results are obtained by analyzing the test data：with the increase of porosity，the elastic modulus，peak stress and Poisson's ratio of concrete gradually decreased，and the peak strain increased gradually；with the increase of porosity，the total absorption energy and elastic energy of the concrete gradually decrease，and the dissipation energy first decreases and then increases.
Key words：concrete，porosity，mechanical properties，energy dissipation