玄武岩纤维RPC基本力学性能及耐久性研究

发布时间：2018-03-30 21:50

本文选题：活性粉末混凝土　切入点：玄武岩纤维　出处：《东北电力大学》2017年硕士论文

【摘要】：活性粉末混凝土(Reactive Powder Concrete,简称RPC)是一种新型的高强度、高耐久性混凝土,由于其优良的性能而具有广泛的应用前景。但由于RPC中常用的钢纤维成本较高,且钢纤维在氯离子和除冰盐等恶劣环境下容易发生锈蚀,因此,越来越多的学者开始着手于用其它种类纤维来代替钢纤维的研究。为了了解玄武岩纤维在RPC中的应用前景,本文用玄武岩纤维代替钢纤维,对玄武岩纤维RPC进行了以下研究并得到了相关结论:1.以玄武岩纤维RPC的水胶比、纤维长度、纤维体积掺量和养护龄期为影响因素,设计制作了十五组不同配合比共180个试件,分别进行了立方体抗压试验和劈裂抗拉试验,确定不同参数对玄武岩纤维RPC强度的影响规律。试验结果表明:对于立方体抗压试验和劈裂抗拉试验,最佳的水胶比均为0.22,对于12mm长玄武岩纤维,最佳纤维体积掺量为0.10%,对于6mm长玄武岩纤维,最佳纤维体积掺量为0.05%。玄武岩纤维对RPC的立方体抗压强度无明显影响规律,对劈裂抗拉强度的有明显的增强作用。相同体积掺量下掺有12mm长纤维的试件强度高于掺有6mm长纤维。玄武岩纤维的掺入对RPC早期强度影响较小。2.以玄武岩纤维长度、纤维体积掺量为影响因素,制作了四组试件,进行玄武岩纤维RPC的轴心抗压试验。结果表明掺入玄武岩纤维后,试件的变形能力得到了提高、破坏过程得到了延缓;掺有12mm长纤维的试件的最佳纤维掺量为0.10%。根据试验数据绘制了玄武岩纤维RPC的应力-应变全曲线,采用分段方程对其本构关系进行拟合,并与试验曲线相对比,拟合结果较好。3.考虑水胶比和纤维体积掺量对玄武岩纤维RPC抗氯离子渗透性能的影响,制作了十二组共36个试件进行试验,试验结果表明,水胶比为0.22、纤维体积掺量为0.10%的试件的抗氯离子渗透性能最好,所有配合比的玄武岩纤维RPC的电通量均在可忽略范围,即玄武岩纤维RPC的抗氯离子渗透性能较好。对一组玄武岩纤维RPC试件进行了碳化试验,在碳化进行28天时仍未测试到碳化深度,即玄武岩纤维RPC具有良好的抗碳化性能。由此可知,玄武岩纤维RPC在耐久性上有良好的表现。
[Abstract]:Reactive Powder concrete (RPCs) is a new type of high strength and high durability concrete, which has a wide application prospect because of its excellent performance.However, due to the high cost of steel fibers commonly used in RPC, and the corrosion of steel fibers in harsh environments such as chloride ions and deicing salts, more and more researchers have begun to study the replacement of steel fibers with other types of fibers.In order to understand the application prospect of basalt fiber in RPC, basalt fiber is used instead of steel fiber in this paper. The basalt fiber RPC is studied as follows and the relevant conclusion: 1.Taking the water-binder ratio, fiber length, fiber volume content and curing age of basalt fiber RPC as the influencing factors, fifteen groups of 180 specimens with different blending ratios were designed and made, and the cube compression test and splitting tensile test were carried out respectively.The influence of different parameters on the RPC strength of basalt fiber is determined.The results show that the optimum water-binder ratio is 0.22 for cube compression test and splitting tensile test, 0.10 for 12mm long basalt fiber, and 0.05 for 6mm long basalt fiber.The basalt fiber has no obvious influence on the cube compressive strength of RPC, but has obvious enhancement effect on the splitting tensile strength.The strength of the specimens doped with 12mm long fibers is higher than that with 6mm long fibers at the same volume.The effect of basalt fiber incorporation on the early strength of RPC is small. 2.Taking the length of basalt fiber and the volume of fiber as the influencing factors, four groups of specimens were made and the axial compression test of basalt fiber RPC was carried out.The results show that the deformation ability of the specimen is improved and the failure process is delayed after the addition of basalt fiber, and the optimum fiber content of the specimen with long 12mm fiber is 0.10%.According to the experimental data, the stress-strain curve of basalt fiber RPC was drawn, and the constitutive relation was fitted by the piecewise equation. Compared with the experimental curve, the fitting result was better. 3.Considering the effects of water / binder ratio and fiber volume content on the permeability of basalt fiber RPC to chloride ions, twelve groups of 36 specimens were made and the results showed that,It can be seen that the durability of basalt fiber RPC is good.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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