Mechanical Analysis of Concrete Specimen under Restrained Condition

武汉理工大学学报-材料科学版(英文版), 2005, 20(3): 91-94.

^1, , ^2, , ^3,

1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150006, China

2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150006, China

3.Department of Civil Engineering, University of Toronto, Toronto M5S1N4, Canada

基金项目: Funded by the University of Toronto, Canada

Mechanical Analysis of Concrete Specimen under Restrained Condition

MA Xinwei ^1, , NIU Changren ^2, , R D Hooton ^3,

1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150006, China

2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150006, China

3.Department of Civil Engineering, University of Toronto, Toronto M5S1N4, Canada

Keywords： free shrinkage

In order to quantify the development of the tensile stresses and obtain a reliable estimation of the cracking risk, the concrete was subjected to restrained conditions. The fully restrained condition was achieved by keeping the length constant of a concrete specimen. Comparing the free shrinkage with the restrained shrinkage,tensile creep could be discriminated from shrinkage. The testing method was introduced in details, and the mechanical behaviors under tensile load were analyzed. Results show that concrete exhibits a pronounced viscoelasticity. Under restrained condition, the self induced tensile stress increases with time. The lower the water to cement ratio, the larger the tensile stress at the same age. The tensile creep of hardening concrete is much larger than that of hardened concrete. The relationships among autogenous shrinkage under free condition, elastic strain and creep under restrained condition are described, and the mathematical model for the calculation of elastic strain and creep is proposed.

参考文献

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Mechanical Analysis of Concrete Specimen under Restrained Condition

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