钢纤维混凝土破坏机理及力学性能试验

Experiments on Failure Mechanism and Mechanical Properties of Steel Fiber Reinforced Concrete

通过分析比较素混凝土和钢纤维混凝土的破坏机理,讨论了钢纤维的加入对混凝土的整个破坏过程的影响,钢纤维的掺入对基体的增强机理和横跨于裂缝间的钢纤维对裂缝发展的约束作用。结果表明:钢纤维对混凝土的阻裂作用很明显,而对混凝土起裂的限制作用不明显。对钢纤维掺量为30 kg/m3的钢纤维喷射混凝土进行现场喷射大板切割试件力学性能试验,研究其立方体抗压强度、轴心抗压强度和劈拉强度,并在试验分析中导入标准差系数对试验数据的可信度进行评价。

Through the analysis and comparison of the failure mechanism between concrete and steel fiber reinforced concrete, the effect of the addition of steel fiber on the whole failure process of concrete and the mechanism of rein- forcing the matrix, and the constraint effect of steel fiber across cracks on the development of cracks were discussed. The results indicated that steel fiber reinforced concrete is of obvious function in crack retardation, but there is no obvious function in the avoidance of cracking. Experiments on the mechanical properties of specimens cut from sprayed plates with the quantity of steel fiber of 30 kg/m3 were conducted to study the cube compressive strength, axial compressive strength and splitting tensile strength, and standard deviation coefficient was introduced into the experimental analysis to evaluate the credibility of the test data.