普通混凝土抗拉强度试验

TENSILE STRENGTH EXPERIMENT ON COMMON CONCRETE

对原状卵石、破碎卵石和石灰岩碎石三种粗集料配制的普通混凝土抗拉强度进行试验。试验结果表明，普通混凝土的单向直接拉伸强度约为弯拉强度的39％-48％，而双向拉伸强度比单向拉伸强度还要低20％～30％，表现为明显的双向拉伸强度弱化效应。这对于在车辆荷载应力和温度应力综合作用下的混凝土路面板等结构设计来说，是一个值得深入研究的重要课题。

It is mainly studied the tensile strength of common concrete which is composed of three coarse aggregates——original state gravel, crushed gravel and limestone rubble. The test results show that the uniaxial direct pulling strength of concrete is about 39~/6 - 48% of resistance to bending and pulling strength, but the two-way tensile strength is about 20% -30% ,which is lower than its uniaxial tensile strength, showing obviously bidirectional tensile strength weakening effect. For the structure design of common concrete road board which is under the comprehensive action of car load stress and temperature stress, it＇s an important problem deserving of deep study.