胶粒混凝土力学性能试验研究
发布时间：2018-11-17 09:49
【摘要】：废旧轮胎数量逐年增加,属于一种工业废弃物。所以废旧轮胎处理及再利用成为各国亟待解决的问题。已有研究表明,将废旧轮胎粉碎掺入水泥混凝土中,可以改善混凝土的性能。本文将废旧轮胎加工成粒径小于5mm的颗粒,按一定的比例替代等体积的砂子配制成胶粒混凝土。采用了不同水灰比,不同胶粒掺量,不同胶粒粒径,三因素三水平的正交试验方案。通过试拌,成型,养护,探讨了28天龄期的不同水灰比,不同胶粒掺量,不同胶粒粒径的胶粒混凝土的力学性能、弹性模量及抗冲磨强度;及各因素对其的影响关系。研究结果表明,橡胶颗粒掺入降低了胶粒混凝土的抗压强度、劈裂强度均低于基准试件相应的抗压强、劈裂强度。通过试验结果可以发现橡胶颗粒掺量变化对强度降低的影响程度大于橡胶颗粒粒径变化产生的影响;同一种粒径下,胶粒混凝土28d龄期抗压强度、劈裂强度随橡胶颗粒掺量的增加均表现出降低的趋势;在橡胶颗粒掺量相同情况下,胶粒混凝土28d龄期抗压强度、劈裂强度均随橡胶颗粒粒径的减小而降低。混凝土的含气量随胶粒掺量的增加而显著增加,而且胶粒颗粒的粒径越小,混凝土含气量增加的幅度越大;混凝土的弹性模量相对于基准混凝土明显降低;胶粒混凝土28d弹性模量受胶粒掺量的影响最大,且随着胶粒掺量增加而降低。水灰比与胶粒混凝土的抗冲磨强度具有良好关系,水灰比小时,有利于提高混凝土的耐磨性,但是水灰比不能无限制的降低,必须能够提供胶凝材料完全水化所需的水分及保证施工过程中的和易性;随着橡胶颗粒掺量的增加,混凝土的耐磨性先提高后降低。橡胶掺量15%时混凝土的抗冲磨强度最高,当掺量达到30%时,抗冲磨强度反而比未掺入时低;掺入的三种粒径中掺入粒径为(2.36-4.75mm)的混凝土耐磨性能最佳,其单位磨损量最小。
[Abstract]:The waste tire quantity increases year by year, belongs to one kind of industrial waste. Therefore, waste tire treatment and reuse has become an urgent problem in various countries. It has been shown that the performance of cement concrete can be improved by grinding waste tires into cement concrete. In this paper, the waste tire is processed into particles with diameter less than 5mm, and the equal volume of sand is replaced by a certain proportion to form concrete. The orthogonal experimental scheme with different water-cement ratio, different content of rubber particles, different particle size and three factors and three levels was adopted. Through trial mixing, molding and curing, the mechanical properties, elastic modulus and impact wear strength of concrete with different water / cement ratio, different amount of rubber particles and different particle sizes of 28 days were discussed, as well as the influence of various factors on it. The results show that the compressive strength of the concrete is decreased with the addition of rubber particles, and the splitting strength is lower than the corresponding compressive strength and splitting strength of the standard specimen. It is found that the influence of rubber particle content on strength reduction is greater than that of rubber particle size change. Under the same particle size, the compressive strength and splitting strength of concrete at 28 d age decreased with the increase of rubber particle content. Under the condition of the same amount of rubber particles, the compressive strength and splitting strength of concrete at 28 d age decreased with the decrease of rubber particle size. The air content of concrete increases significantly with the increase of the content of rubber particles, and the smaller the particle size, the larger the increase of air content of concrete, and the lower the elastic modulus of concrete is compared with the standard concrete, the smaller the particle size is, the larger the increase of air content in concrete is. The elastic modulus of grained concrete is the most affected by the content of colloidal particles in 28 days, and decreases with the increase of the content of rubber particles. The water-cement ratio has a good relationship with the impact and wear strength of the concrete. The low water-cement ratio can improve the wear resistance of concrete, but the water-cement ratio can not be reduced indefinitely. Must be able to provide the moisture required for the complete hydration of the cementitious material and ensure ease during construction; With the increase of rubber particle content, the wear resistance of concrete first increases and then decreases. The anti-wear strength of concrete is the highest when the rubber content is 15 and when it reaches 30%, the anti-wear strength of concrete is lower than that of the unadulterated concrete. The wear resistance of concrete mixed with 2.36-4.75mm is the best and the unit wear is the smallest.
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528
本文编号：2337351
[Abstract]:The waste tire quantity increases year by year, belongs to one kind of industrial waste. Therefore, waste tire treatment and reuse has become an urgent problem in various countries. It has been shown that the performance of cement concrete can be improved by grinding waste tires into cement concrete. In this paper, the waste tire is processed into particles with diameter less than 5mm, and the equal volume of sand is replaced by a certain proportion to form concrete. The orthogonal experimental scheme with different water-cement ratio, different content of rubber particles, different particle size and three factors and three levels was adopted. Through trial mixing, molding and curing, the mechanical properties, elastic modulus and impact wear strength of concrete with different water / cement ratio, different amount of rubber particles and different particle sizes of 28 days were discussed, as well as the influence of various factors on it. The results show that the compressive strength of the concrete is decreased with the addition of rubber particles, and the splitting strength is lower than the corresponding compressive strength and splitting strength of the standard specimen. It is found that the influence of rubber particle content on strength reduction is greater than that of rubber particle size change. Under the same particle size, the compressive strength and splitting strength of concrete at 28 d age decreased with the increase of rubber particle content. Under the condition of the same amount of rubber particles, the compressive strength and splitting strength of concrete at 28 d age decreased with the decrease of rubber particle size. The air content of concrete increases significantly with the increase of the content of rubber particles, and the smaller the particle size, the larger the increase of air content of concrete, and the lower the elastic modulus of concrete is compared with the standard concrete, the smaller the particle size is, the larger the increase of air content in concrete is. The elastic modulus of grained concrete is the most affected by the content of colloidal particles in 28 days, and decreases with the increase of the content of rubber particles. The water-cement ratio has a good relationship with the impact and wear strength of the concrete. The low water-cement ratio can improve the wear resistance of concrete, but the water-cement ratio can not be reduced indefinitely. Must be able to provide the moisture required for the complete hydration of the cementitious material and ensure ease during construction; With the increase of rubber particle content, the wear resistance of concrete first increases and then decreases. The anti-wear strength of concrete is the highest when the rubber content is 15 and when it reaches 30%, the anti-wear strength of concrete is lower than that of the unadulterated concrete. The wear resistance of concrete mixed with 2.36-4.75mm is the best and the unit wear is the smallest.
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528
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