有机仿钢纤维天然浮石轻骨料混凝土的实验研究

发布时间：2018-07-29 20:18

【摘要】：随着我国综合国力的不断提升,各项基础建设广泛开展,传统混凝土扮演着重要的角色,随着实际工程不断应用和科学研究的不断深入,纤维轻骨料混凝土则被逐渐广泛应用,它克服了传统混凝土自重大、韧性差的缺陷,较好的提高混凝土的耐久性。纤维轻骨料混凝土是用轻骨料代替传统骨料掺入混凝土中,并掺入一定量的纤维。内蒙古自治区盛产浮石,其储量丰富,将本地区的天然浮石作为混凝土中的粗骨料,这将充分发挥地区资源优势,促进本地区经济发展。本论文着重研究了有机仿钢纤维天然浮石轻骨料混凝土的力学性能、抗冻耐久性和孔结构特征。在力学方面,研究了不同有机仿钢纤维掺量对天然浮石轻骨料混凝土的立方体抗压强度、劈裂抗拉和抗折强度的影响;抗冻性方面,进行了冻融循环试验,探究了有机仿钢纤维对天然浮石轻骨料混凝土相对动弹模量和质量损失率的影响变化趋势;孔结构方面,进行了气泡特征参数分析,同时探究了气泡特征参数对基本力学性能和抗冻耐久性的影响规律,分析有机仿钢纤维在天然浮石轻骨料混凝土中的最佳掺量。研究结果显示:在天然浮石轻骨料混凝土中掺入一定量的有机仿钢纤维,能够提高混凝土的力学性能和抗冻性能。有机仿钢纤维最佳掺量为0.7%。
[Abstract]:With the continuous improvement of China's comprehensive national strength and extensive development of basic construction, traditional concrete plays an important role. With the continuous application of practical projects and the deepening of scientific research, fiber lightweight aggregate concrete is gradually widely used. It overcomes the defects of traditional concrete, such as self-important and poor toughness, and improves the durability of concrete. Fiber lightweight aggregate concrete is used to replace the traditional aggregate into concrete, and a certain amount of fiber is added. The Inner Mongolia Autonomous region is rich in pumice, which is rich in reserves. The natural pumice in this region will be used as coarse aggregate in concrete, which will give full play to the advantages of regional resources and promote the economic development of the region. In this paper, the mechanical properties, antifreeze durability and pore structure of organic steel fiber natural pumice lightweight aggregate concrete are studied. In terms of mechanics, the effects of different organic steel fiber contents on cube compressive strength, splitting tensile strength and flexural strength of natural pumice lightweight aggregate concrete were studied. The influence of organic steel imitation fiber on the relative dynamic modulus and mass loss rate of natural pumice lightweight aggregate concrete was investigated, and the bubble characteristic parameters of natural pumice lightweight aggregate concrete were analyzed. At the same time, the influence of bubble characteristic parameters on the basic mechanical properties and frost durability is studied, and the optimum content of organic steel fiber in natural pumice lightweight aggregate concrete is analyzed. The results show that the mechanical properties and freezing resistance of natural pumice lightweight aggregate concrete can be improved by adding a certain amount of organic steel imitation fiber into the concrete. The optimum content of organic steel imitation fiber is 0.7.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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