掺加硅粉及纤维改性再生混凝土性能试验研究

Experimental Study on the Modified Recycled Concrete Performance with Silica Fume and Hybrid fiber

再生混凝土因其能够妥善处理环境与资源的压力,而被广大学者所研究.以硅粉与纤维的不同掺量为变量,设计并制作了再生骨料取代率为30%的再生试块,并对其立方体抗压强度、轴心抗压强度、劈裂抗拉强度、抗折强度、弹性模量、峰值应变等力学与变形指标进行了研究,探寻硅粉与纤维对其性能的影响规律,为其在工程实践中的应用提供参考依据.结论表明:硅粉增加了再生混凝土的立方体抗压强度,但降低了棱柱体抗压强度,对其他参数的影响呈现出不规则的波动;纤维能够显著的提高再生混凝土的变形性能,使其他各强度值出现不同程度的降低.试验也表明,经过合理设计的硅粉与纤维掺量,能够弥补再生混凝土的缺陷,使其各方面的综合性能达到最优.

pressure of compressive Recycled concrete has been studied by the environment and resources. According to the strength , axial compressive strength majority of scholars, which could properly handle the contrastive analysis of the indicators, such as standard , tensile splitting strength, flexural strength and modulus of elasticity, peak strain, we summarized the influence of silicon powder and fiber on the mechanical and deformation of recycled concrete with 30% recycled aggregate replacement and provided a reference for its application in engineering practice. The conclusion showed that silica fume increased the cube compressive strength of recycled aggregate concrete and decreased the prism compressive strength, meanwhile it could made irregular fluctuation effects on other parameters. Fiber could significantly improve the deformation properties of recycled concrete and made the other strength value decreased in different extent. The experiment also indicated that, the silicon powder and fiber content could make up for the defects of the recycled concrete after reasonable design, which led to the comprehensive performance to the optimal degree.