钢-PVA纤维混凝土早龄期力学性能及弹性模量研究

Research on Early-age Mechanical Properties and Elastic Modulus of Steel and PVA Fiber Reinforced Concrete

为研究钢-PVA纤维混凝土早龄期力学性能,将钢纤维和PVA纤维掺入混凝土中,测试早龄期力学性能和弹性模量发展变化规律。结果表明,钢-PVA纤维可以提高混凝土早龄期力学强度,其中轴拉强度增幅最大,受拉弹性模量次之,轴压强度增幅最小;此外,钢-PVA纤维还可以提高早龄期轴拉峰值应变,改善混凝土脆性。根据试验结果提出了钢-PVA混凝土早龄期力学强度计算模型,并与试验值比较,验证了所建模型的有效性。

In order to study the early-age mechanical properties of steel PVA fiber reinforced concrete, steel fiber and PVA fiber were added into concrete to test the development and change law of early-age mechanical properties and elastic modulus. The results show that the steel PVA fiber can improve the mechanical strength of concrete at early-age, the increase of axial tensile strength is the largest, the elastic modulus in tension is the second, and the increase of axial compressive strength is the smallest. Steel PVA fiber can increase the peak axial tensile strain at early-age and improve the brittleness of concrete. According to the test results, the calculation formula of early-age mechanical strength of steel PVA concrete is put forward. The effectiveness of the model is verified by comparing with the experimental values.