普强高性能混凝土受压应力-应变全曲线试验研究

Experimental Study of the Complete Stress-Strain Curve for Concrete of Middling Strength and High Performance Under Compression

通过普强高性能混凝土和普通混凝土的应力-应变全曲线试验研究,得到一系列应力-应变曲线。对普强高性能混凝土和普通混凝土的立方体抗压强度与棱柱体抗压强度的关系、棱柱体抗压强度与峰值应力所对应应变的关系及棱柱体抗压强度与初始弹性模量的关系进行了分析。结果表明,虽然普强高性能混凝土的力学性能与普通混凝土的力学性能存在一定的差别,但主要力学性能还是相似的。说明在不改变混凝土的力学性能的基础上通过对普通强度混凝土原材料的优选和配合比的优化能够提高混凝土的耐久性能。

Experimental study of the complete curve of the stress-strain relationship respectively for concrete of middling strength and high performance （HPC） and for common concrete was conducted. A series of the complete curves of the stress-stlain relationship respectively for HPC and common concrete have been obtained. The compressive strength respectively for a HPC cube and a common concrete cube, and that respectively for a HPC rhombus chunk and a common concrete rhombus chunk are compaired. Also the relationship between the compressive strength of a rhombus chunk and the strain corresponding to the peak stress, and that between its compressive strength and the initial modulus of elasticity are analyzed. It is shown by the analysis results that the main mechanical properties of HPC are similar to those of common concrete although there is some difference between the two. Therefore the endurance of common concrete can be enhanced if some common concrete are selected and utilized. The optimum mixture ratio among those concrete materials is sought, and their main machanical properties can keep unchanged.