弹性橡胶混凝土压、弯变形性能试验研究

对普通混凝土、橡胶混凝土及橡胶纤维混凝土进行了单轴受压及四点弯曲荷载作用下变形性能的试验研究,得到了各组混凝土的单轴受压应力-应变全曲线及弯曲荷载作用下的荷载-挠度曲线,并对单轴受压应力-应变全曲线进行了拟合,得出了全曲线方程及拟合参数。结果表明,橡胶及橡胶纤维混凝土单轴受压应变峰值分别是普通混凝土的1.74和1.92倍,弯拉荷载作用下的极限挠度分别达到0.66mm和0.80mm,折压比分别是普通混凝土的1.45和1.64倍。说明橡胶及纤维的掺入大大提高了普通水泥混凝土的韧性及变性性能。

Experimental Study on Deformation Characteristic of Elastic Rubberized ConcreteUnder Compressive and Flecxural Loading

The deformation of the ordinary concrete, rubberized concrete and fiber reinforced rubberized concrete under uniaxial compression and four-point flexure is studied by tests, and the stress-strain curves under uniaxial compression and the load-deflection curve under four-point flexure are obtained. Then the complete stress-strain curves are analyzed and compared theoretically, and the simulated stress-strain equations are established. The results show that the strain at ultimate stress of rubberized concrete and fiber reinforced rubberized concrete under uniaxial compression is 1.74 and 1.92 times of the ordinary concrete respectively, and the ultimate deflection of rubberized concrete and fiber reinforced rubberized concrete under flexure is of 0.66mm and 0.80mm respectively, while the ordinary is only of 0.32mm. The ratio of flexural strength to compression strength of rubberized concrete and fiber reinforced rubberized concrete is 1.45 and 1.64 times of the ordinary concrete. The results also show that the addition of rubber and fiber has greatly improved the toughness and deformationness of the ordinary cement concrete.