沙漠砂混凝土轴心受压应力-应变曲线试验分析

为探究单一变量下沙漠砂混凝土应力-应变全曲线,分别设计4组不同沙漠砂取代率的棱柱体混凝土试块,进行单轴受压试验,分析沙漠砂混凝土破坏现象、破坏过程以及破坏特征,并研究不同沙漠砂取代率对沙漠砂混凝土峰值应变、极限应变、弹性模量的影响.研究结果显示:沙漠砂混凝土与普通混凝土相比,其破坏特征具有一定的差异性;取代率为20％时沙漠砂混凝土其轴心受压强度达到最高,且胶凝材料对沙漠砂包裹效果较为明显;沙漠砂混凝土脆性明显高于普通混凝土;沙漠砂混凝土无量纲应力-应变曲线上升段、下升段均采用过镇海模型较为贴合,且能准确描述沙漠砂混凝土在单轴受压作用下的变形特征.

Experimental analysis of stress-strain curve of desert sand concrete under axial compression

In order to explore the stress-strain curve of desert sand concrete under single variable, four groups of prismatic concrete blocks with different replacement rates of desert sand were designed and tested under uniaxial compression. The failure phenomena, process and characteristics of desert sand concrete were analyzed, and the peak strain of desert sand concrete with different replacement rates of desert sand was studied. The influence of ultimate strain and modulus of elasticity. The results show that the destructive characteristics of desert sand concrete are different from those of ordinary concrete; when the replacement ratio is 20%, the axial compressive strength of desert sand concrete is the highest, and the effect of cementing material on encapsulating desert sand is obvious; the brittleness of desert sand concrete is obviously higher than that of ordinary concrete; desert sand coagulation It is more suitable to adopt Zhenhai model in the ascending and descending parts of soil dimensionless stress-strain curve, and it can accurately describe the deformation characteristics of desert sand concrete under uniaxial compression.