矿渣活性粉末混凝土受压应力—应变特征研究

矿渣活性粉末混凝土是活性粉末混凝土(RPC)的改良品种。对于不同掺量的矿渣RPC以及钢纤维增强RPC等材料的抗压应力-应变的特征进行了分析和研究。实验结果表明,该材料受压应力-应变存在明显的阶段性和规律性,在宏观上反映了材料在受压破坏过程中微裂纹的扩展情况;矿渣掺量的增加可以在一定程度上改善材料的韧性;掺入钢纤维可以阻止材料发生瞬间崩溃,且在达到极限荷载以后,仍能保持相当高的承载能力。并在实验分析的基础上建立起矿渣RPC的受压应力-应变曲线模型。

Slag reactive powder concrete (RPC) is upgrade of reactive powder concrete.Research and analysis have been made on features of compressive stress-train curve of RPC with different amount of slag and steel fibre reinforced RPC.The result of experiments indicates that the curve has its own rule and obvious stages,and that macroscopically demonstrates the changes of micro-crack in RPC in the course of damage under compression.The increase of slag amount can improve tenacity of the material to a certain extend.The increase of steel fibre amount can prevent the material from instant collapse,and still maintain quite high bearing capacity when reaches the ultimate load.The model of compressive stress-strain curve of slag RPC has been set on the basis of experimental analysis.