橡胶集料混凝土的配制及性能试验研究

发布时间：2018-05-14 01:29

本文选题：橡胶集料混凝土 + 配制　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：橡胶颗粒部分取代天然集料配制的橡胶集料混凝土是现代先进的水泥基材料。其具有韧性好、延性好、抗疲劳能力高、阻尼系数高,以及耐久性好等优异性能,使其在土木工程中有着非常广阔的应用前景。本文是辽宁省教育厅科学研究项目《基于微观结构的橡胶集料混凝土耐久性研究》(L2012123)的子课题,取得的研究结果都是在该基金支助下完成的。论文对橡胶集料混凝土的配制技术、技术性能,以及橡胶集料钢筋混凝土简支梁的制备及性能等进行了研究,取得以下研究成果：(1)不同尺寸的橡胶细集料对混凝土拌合物坍落度影响较明显。当橡胶颗粒取代细集料砂子的取代率为10%(体积取代率)时,橡胶颗粒粒径对混凝土拌合物的影响程度为：0.165～0.315mm大于0.315～0.63mmm大于0.63～1.25mm的,当橡胶粒径继续增大,坍落度又有所增加；不同尺寸的橡胶细集料对硬化混凝土强度影响较明显。当橡胶颗粒取代细集料砂子的取代率为10%(体积取代率)时,橡胶颗粒粒径对混凝土抗压强度的影响有明显的规律性,即随着橡胶颗粒粒径的变大,混凝土抗压强度变大,而劈拉强度变化没有规律性,轴心抗压强度与立方体抗压强度之间的关系与普通混凝土相似。(2)当掺入粒径为0.165～0.315mm的橡胶颗粒10%(体积取代率)时,橡胶集料混凝土的抗氯离子渗透性能、抗水渗性能、抗盐冻性能、抑制碱骨料反应性能都得到了提高。微观结构显示,适量的橡胶细集料能改善混凝土中水泥石的孔隙结构,提高了混凝土的耐久性。(3)橡胶集料钢筋混凝土简支梁在破坏时,裂缝出现位置与普通钢筋混凝土简支梁相似只是数量减少,裂缝间距比普通混凝土更大,且橡胶集料钢筋混凝土简支梁跨中截面的应变变化符合平截面假定原理。
[Abstract]:Rubber aggregate concrete, which partly replaces natural aggregate, is a modern advanced cement-based material. It has excellent properties such as good toughness, good ductility, high fatigue resistance, high damping coefficient and good durability, so it has a very broad application prospect in civil engineering. This paper is a subproject of the scientific research project of Liaoning Provincial Education Department, "study on durability of Rubber aggregate concrete based on Microstructure" (L2012123). The research results obtained are all completed with the support of the fund. In this paper, the preparation technology and performance of rubber aggregate concrete, as well as the preparation and performance of rubber aggregate reinforced concrete simply supported beam are studied. The following research results are obtained: (1) different sizes of rubber fine aggregate have obvious effect on the slump of concrete mixture. When the substitution ratio of rubber particle to fine aggregate sand is 10% (volume substitution rate), the influence of rubber particle diameter on concrete mixture is greater than that of 0.315~0.63mmm 0.315 mm, and when rubber particle size continues to increase, the slump increases. Rubber fine aggregate of different size has obvious influence on the strength of hardened concrete. When the substitution ratio of rubber particles to fine aggregate sand is 10 (volume substitution ratio), the influence of rubber particle size on the compressive strength of concrete is obvious, that is, with the increase of rubber particle size, the compressive strength of concrete becomes larger. The relationship between axial compressive strength and cube compressive strength is similar to that of ordinary concrete. The resistance of rubber aggregate concrete to chloride ion penetration, water permeability, salt freezing resistance and alkali aggregate reaction resistance were improved. The microstructure shows that proper amount of rubber fine aggregate can improve the pore structure of cement stone in concrete, and improve the durability of concrete. The location of cracks is similar to that of plain reinforced concrete beams, but the number of cracks is reduced, the distance between cracks is larger than that of ordinary concrete, and the strain variation of the middle section of rubber aggregate reinforced concrete simply supported beams conforms to the principle of plane section assumption.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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