圆柱体径向劈拉法检测橡胶混凝土抗拉强度试验研究

Experimental Study on Measuring the Tensile Strength of Rubber Concrete by Cylindrical Radial Splitting Method

圆柱体径向劈拉法是一种测试橡胶混凝土抗拉强度的新方法。与巴西劈裂法相比,圆柱体径向劈拉法具有在试样数量相同的情况下数据量翻倍、提高检测精度的优点。采用有限元分析软件对混凝土圆柱体径向劈裂法进行模拟,确定了破坏面上的应力分布型式。结果表明:混凝土圆柱体劈拉断裂主要由拉应力决定。通过立方体劈拉试验和圆柱体径向劈拉试验,获得了普通混凝土和橡胶混凝土的抗拉强度。圆柱体径向劈拉试验数据与立方体劈拉试验数据具有稳定的相关性,较好地表征了混凝土的抗拉强度。通过对试验数据的线性分析,建立了圆柱体名义径向劈拉强度(f_(2))与立方体劈拉强度(f_(1))之间的关系,即f_(1)=0.52 f_(2),计算得到的立方体劈拉强度值与试验值吻合较好。

Cylinder transverse splitting test is a new method to test the tensile strength of rubber concrete.Compared with the Brazilian test,the cylinder transverse splitting test involves different load positions and offers the advantages of doubling the data volume with the same num⁃ber of specimens and improving the detection accuracy.Finite element analysis software was used to simulate the concrete cylinder transverse splitting test and the stress distribution on the failure surface was determined.The results show that the fracture of a cylinder is mainly deter⁃mined by tensile stress.The splitting strength of normal concrete and rubber concrete,a new environmentally friendly concrete material that has gathered considerable attention in recent years,is obtained by cylinder transverse and cube splitting tests.The cylinder transverse split⁃ting test data show a correlation with the cube splitting test data and well characterize the concrete strength.The relationship between the cyl⁃inder nominal transverse splitting strength(f_(2))and cube splitting strength(f_(1))is established on the basis of linear analysis of the test data:f_(1)=0.52 f_(2).The calculated cube splitting strength is in good agreement with the test values.