钢纤维掺量对活性粉末混凝土力学性能的影响

通过实验研究了活性粉末混凝土的基本力学性能(抗压强度、劈拉强度和抗折强度),分析了钢纤维掺量对活性粉末混凝土力学性能的影响,拟合得到了抗折强度与劈拉强度之间的关系表达式。在实验分析的基础上,建立了不同钢纤维体积含量活性粉末混凝土受压应力-应变全曲线的数学表达式。研究结果表明：钢纤维体积含量在1.0%～3.5% 之间时,活性粉末混凝土的抗压强度、劈拉强度和抗折强度均随着钢纤维掺量的增加而增大;当钢纤维体积含量超过3.5% 后,活性粉末混凝土抗压强度下降,劈拉强度略有提高,而抗折强度仍有明显的提高。

On the Influence of Steel Fiber Volume Fraction on Mechanical Properties of Reactive Powder Concrete

Basic mechanical properties such as compressive strength, splitting tensile strength and flexural strength of reactive powder concrete were experimentally investigated. The influence of steel fiber volume fraction on mechanical properties of RPC was analyzed. A fitted relation expression between flexural strength and splitting tensile strength was obtained. A mathematical expression for compressive stress-strain curve of reactive powder concrete was established for different stee1 fiber volume fractions based on experimental analysis.Resu1ts show that compressive strength, splitting tensile strength and flexural strength of reactive powder concrete specimens increase along with the steel fiber content increase when the steel fiber volume fraction is in the range from 1.0% to 3.5%. When the steel fiber volume fraction is higher than 3.5%, its compressive strength decreases, the splitting tensile strength increases slightly, however, its flexural strength increases obviously.