Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (11): 106-112.doi: 10.3969/j.issn.1000-565X.2014.11.016

• Architecture & Civil Engineering • Previous Articles     Next Articles

Strain Rate Sensitivity and Constitutive Relation of Mechanical Properties of CA Mortar

Zhang Sheng1,2 Fu Qiang1 Zhou Xi- ling1,2 Long Guang- cheng1 Xie You- jun1   

  1. 1.School of Civil Engineering,Central South University,Changsha 410075,Hunan,China; 2.College of Basic Education for Commanding Officers,National University of Defense Technology,Changsha 410072,Hunan,China; 3.College of Engineering,Hunan Agriculture University,Changsha 410128,Hunan,China
  • Received:2014-04-23 Revised:2014-07-14 Online:2014-11-25 Published:2014-11-17
  • Contact: 谢友均(1964-)，男，博士，教授，主要从事先进水泥基材料研究． E-mail:xieyj@mail.csu.edu.cn
  • About author:张胜(1975-)，男，博士生，讲师，主要从事先进水泥基材料力学性能的研究．E-mail:393133345@qq．com
  • Supported by:

    国家“973” 计划项目(2013CB036200);国家自然科学基金资助项目(51278498)

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Abstract:

In order to investigate the strain rate sensitivity of the mechanical properties of cement and asphalt mortar (CA mortar),the stress- strain compressive experiment of CA mortar at different strain rates was performed by means of a microcomputer- controlling electronic universal testing machine.The results show that the mechanical properties of CA mortar increase with the strain rate,and the strain rate sensitivities are attributed to the limit of the crack propagation velocity,the inertial effect of the lateral deformation and the horizontal restraint of the asphalt network structure.Furthermore,a constitutive relation of strain rates is established.The constitutive relation can accurately stimulate the peak strength and elastic modulus of CA mortar,and the multiple correlation coefficients of the fitting and experimental results in the whole deformation process are both greater than 0.93.It is also found from the analysis of the sensitivity of constitutive relation that,the higher the strain rate is,the lower the toughness and strain rate sensitivity of CA mortar will be.

Key words: cement and asphalt mortar, strain rate sensitivity, stress- strain curves, constitutive relation, toughness

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