加荷速率与受力状态对高水材料凝结体力学参数的影响

针对高水材料凝结体在不同加荷速率及不同受力状态下的强度参数,选用水灰比为6∶1(含水率86%),研究当加荷速率变化时,高水材料凝结体抗压、抗拉及抗弯强度参数的变化情况。通过进行高水材料凝结体在不同加荷速率下的单轴压缩实验、拉伸实验和弯曲实验。实验结果表明,材料在单轴压缩时会因挤压而有一定程度的失水,同时材料表现出弹-塑性的特点。在拉伸和弯曲时,无出水情况,试样从中部直接被拉断。随着加荷速率的增大,高水材料凝结体的抗压、抗拉和抗弯强度都增大。在同一加荷速率下,高水材料凝结体的抗压强度抗弯强度抗拉强度。

Effect of Mechanical Parameters of High-water-concretion by Loading Rate and Forced State

For the strength parameters of high-water-concretion in different loading rate and forced state, use water-cement ratio of 6:1(moisture content is 86%), and study the change of compressive resistance, tensile resistance and bending strength parameters of high-water-concretion when loading rate is changed. By conducting the uniaxial compression test, tensile test and bending test of high-water-concretion when loading rate is changed. Study found that, the material had water loss in some degree by extrusion when conducted the uniaxial test, and the material exhibited elastic-plastic characteristics. In tensile and bending test, there was no water loss, and the samples were tensile failure by the middle. With the increasing of loading rate, the compression strength, tensile strength and bending strength of high-water-concretion were all improved. When at the same loading rate, the strength of high-water-concretion was compression strength > bending strength > tensile strength.