矿渣高性能混凝土高温后受压本构关系试验

Experimental Study on Compressive Relationship of HPC at Elevated Temperature

以C5 0矿渣高性能混凝土为研究对象 ,对 2 0个受高温后的 10 0mm× 10 0mm× 30 0mm棱柱体试块进行了抗压试验 .介绍了试验设计和有关的试验现象 ,分析了高性能混凝土在高温后的力学性能 ,得出了高性能混凝土在经历不同温度 (2 0～ 80 0℃ )后的应力 -应变全曲线 ,并通过最小二乘法拟合回归建立了相应的本构关系 .通过对比分析全曲线各阶段的特点 ,得出了高性能混凝土在高温后强度、变形、模量以及泊松比随受温高低的变化规律 ,提出了一些相关的数学表达式 。

Based on 20 prism specimens(100 mm×100 mm×300 mm) of HPC(C50) at elevated temperature,this paper describes the design of the compressive tests and some relevant phenomena in testing,analyzes the mechanical properties of HPC at elevated temperature,and obtains the full stress-strain curves of HPC at elevated temperature from 20 ℃ to 800 ℃,then establishes the compressive constitutive relationship by the method of least squares.By analyzing the staged characteristics of the full stress-strain curves,the regularity of the strength,strain,modulus and Poisson's ratio of HPC at elevated temperature is discussed and some corresponding mathematical formulas are suggested.In this paper,some relevant compared properties with normal strength concrete are put forward.