橡胶集料混凝土路用性能试验研究

发布时间：2018-01-11 06:15

本文关键词：橡胶集料混凝土路用性能试验研究　出处：《辽宁工程技术大学》2014年硕士论文　论文类型：学位论文

【摘要】：橡胶集料混凝土作为一种新型节能环保材料,因其具有良好的工程特性如弹性模量低、脆性低、抗裂性能好、阻尼系数高等,更适合作路面材料。本文是辽宁省教育厅资助项目—“基于微观结构特征的橡胶集料混凝土耐久性研究”的子项目,主要针对橡胶集料的掺量和粗细程度对路面混凝土工作性、强度、抗氯离子渗透和抗盐冻等性能影响进行研究,取得如下研究成果。(1)利用清水、NaOH溶液对橡胶集料表面处理后,发现与未经处理的相比,配制的混凝土和砂浆强度无显著提高。因此,对于橡胶细集料,特别是橡胶粉,从混凝土强度角度考虑,没有必要对其表面进行处理。(2)橡胶的掺入降低了混凝土的流动性,当橡胶颗粒取代细集料的取代率为55%时,混凝土拌合物不仅流动性变差,且粘聚性也变差。橡胶颗粒掺量越多,细度越小,对混凝土拌合物的工作性影响越大。橡胶集料混凝土的表观密度,随着橡胶颗粒掺量的递增而递减。(3)橡胶集料混凝土的抗压强度,随着橡胶颗粒掺量的递增而递减。正交分析结果显示,橡胶颗粒的掺量对混凝土抗压强度影响特别显著,粗细程度对混凝土抗压强度影响显著,且二者与混凝土抗压强度之间存在线性相关性。(4)橡胶颗粒的掺量和粗细程度对混凝土抗氯离子渗透性能影响显著。橡胶颗粒越细,对抗氯离子渗透越有利。橡胶颗粒取代率一旦超过25%,混凝土抗氯离子渗透性能便开始下降。当橡胶颗粒取代率为25%且为特细橡胶粉时,混凝土的电通量最小,仅为基准混凝土的42.4%,氯离子渗透性能力很低。橡胶颗粒的掺量、细度模数与混凝土的电通量之间存在线性相关性。(5)橡胶颗粒的掺量对混凝土抗盐冻性能影响特别显著,粗细程度影响显著。200次冻融循环后,只有取代率为25%且粗橡胶颗粒和中橡胶颗粒两组橡胶集料混凝土破坏。在本试验条件下,掺入40%特细橡胶颗粒,混凝土抗盐冻性能最好。二者与混凝土动弹模损失率之间也存在线性相关性。
[Abstract]:As a new energy saving and environmental protection material, rubber aggregate concrete has good engineering properties such as low elastic modulus, low brittleness, good crack resistance and high damping coefficient. This paper is a subproject of "Research on durability of Rubber aggregate concrete based on Microstructure characteristics" funded by Liaoning Provincial Education Department. The effects of rubber aggregate content and thickness on the workability, strength, chloride penetration resistance and salt freezing resistance of pavement concrete were studied, and the following research results were obtained: 1) using clear water. After the surface treatment of rubber aggregate by NaOH solution, it was found that the strength of concrete and mortar prepared by NaOH solution was not significantly improved compared with that of untreated aggregate. Therefore, for rubber fine aggregate, especially rubber powder. From the point of view of concrete strength, it is not necessary to treat the surface of concrete. 2) the mixing of rubber reduces the fluidity of concrete, when the substitution ratio of rubber particles to fine aggregate is 55. The more rubber particles, the smaller the fineness, the greater the influence on the workability of concrete mixture. The apparent density of rubber aggregate concrete. The compressive strength of rubber aggregate concrete decreases with the increase of rubber particle content. The orthogonal analysis results show that the compressive strength of rubber aggregate concrete decreases with the increase of rubber particle content. The content of rubber particles has a significant effect on the compressive strength of concrete, and the degree of thickness has a significant effect on the compressive strength of concrete. And there is a linear correlation between them and the compressive strength of concrete. 4) the content and thickness of rubber particles have a significant effect on the chloride ion permeability of concrete. The finer the rubber particles are. When the substitution ratio of rubber particles exceeds 25, the resistance of concrete to chloride ion penetration begins to decline. When the substitution ratio of rubber particles is 25% and is ultrafine rubber powder. The electric flux of concrete is the smallest, which is only 42.4 of the standard concrete. The permeability of chloride ion is very low, and the content of rubber particles is very low. There is a linear correlation between the modulus of fineness and the electric flux of concrete. (5) the content of rubber particles has a significant effect on the frost resistance of concrete, and the degree of thickness has a significant effect on the freezing and thawing cycles of concrete for 200 times. Only the substitution ratio is 25% and the two groups of rubber aggregate concrete are destroyed by coarse rubber particles and medium rubber particles. Under the test conditions, 40% extra fine rubber particles are added. The salt freezing resistance of concrete is the best, and there is a linear correlation between them and the loss rate of concrete dynamic modulus.
【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】：2014
【分类号】：U414

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