混杂纤维大体积混凝土低水化热配合比试验与力学特性

Mixing ratio experiment and mechanical properties of hybrid fiber bulk concrete hydration heat treatment

为了研究混杂纤维大体积混凝土水化热处理配合比试验与力学特性,首先通过对现有纤维混凝土的情况进行分析,选择通过将不同模量的纤维进行混掺的方式,将聚丙烯腈纤维还有玄武岩纤维混掺,形成混杂纤维混凝土;然后进行配合比设计,根据研究目标即纤维对混凝土力学特性的影响,将研究内容分为纤维总掺量对混凝土力学特性的影响、纤维比值对混凝土力学特性的影响两部分;最后,按照混凝土配合比设计进行试验,分别研究纤维总掺量及纤维比值对混凝土抗折强度的影响、纤维总掺量及纤维比值对混凝土抗压强度的影响、纤维总掺量及纤维比值对混凝土抗拉强度的影响,得到最佳纤维总掺量以及玄武岩纤维和聚丙烯腈纤维混合的最佳比值,并且分析试验结果。对于抗折强度最佳纤维总掺量为0.1%、最佳纤维比值为1∶1;对于抗压强度最佳纤维总掺量为0.08%、最佳纤维比值为1∶1;对于抗拉强度最佳纤维总掺量为0.1%、最佳纤维比值为3∶1。

In order to study the mixing ratio experiment and mechanical properties of hybrid fiber bulk concrete hydration heat treatment,firstly,by analyzing the existing fiber concrete,the polyacrylonitrile fiber is also selected by mixing different modulus fibers.The basalt fiber is mixed to form hybrid fiber concrete.Then the mix design is carried out.According to the research goal,that is,the influence of fiber on the mechanical properties of the concrete,the research content is divided into the influence of the total fiber blending on the mechanical properties of the concrete,and the fiber ratio to the concrete mechanics.The influence of characteristics is divided into two parts.Finally,according to the concrete mix design,the effects of total fiber blending and fiber ratio on concrete flexural strength,total fiber blending ratio and fiber ratio on concrete compressive strength are studied.The influence of the total fiber blending amount and fiber ratio on the tensile strength of concrete,the best blend of the best fiber and the optimum ratio of basalt fiber and polyacrylonitrile fiber mixture,and the test results were analyzed.For the flexural strength,the total fiber blending amount is 0.1%,the optimum fiber ratio is 1∶1;for the compressive strength,the total fiber blending amount is 0.08%,and the optimal fiber ratio is 1∶1.The optimum tensile strength of the fiber is 0.1%,and the optimum fiber ratio is 3∶1.