湿态混凝土常规三轴压缩试验研究

为了研究水饱和情况下混凝土性能(相比于自然湿度混凝土)的变化情况,对不同应变速率时的自然湿度和水饱和混凝土做了常规三轴应力作用下的抗压试验,得到了不同湿度混凝土的应力应变全曲线,分析了不同湿度混凝土的峰值应力与应变、割线弹性模量,并基于损伤力学研究了混凝土的力学损伤特性。研究结果表明,常规三轴压缩状态下水饱和混凝土相同应变所对应的应力值较自然湿度混凝土小,即相同应变作用下水饱和混凝土较自然湿度混凝土破坏严重,这种状态将一直持续到混凝土破坏为止。

Study of Wet Concrete of Triaxial Compression Test

In order to research the changes of mechanical properties of concrete under water saturated condition and natural humidity condition, the natural humidity and water saturation of concrete of compressive experiments in action of triaxial stress are carried out under different strain rates. The stress strain curve of different humidity of concrete is obtained. The peak stress, strain and secant elastic modulus of concrete are analyzed under different humidity. The damage characteristics of concrete is studied based on the concept of damage mechanics. The results show that the corresponding strains in the same stresses of water saturated concrete are smaller than those of natural humidity concrete under triaxial compression condition; the destroy of water saturated concrete is more serious than natural humidity concrete under the same strain status, and this condition lasts till the concrete is broken.