相变硅粉混凝土落锤冲击性能试验研究

发布时间：2018-01-02 10:40

本文关键词：相变硅粉混凝土落锤冲击性能试验研究　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：为提高混凝土韧性、隔热保温性能、并改善其易脆性的缺点,通过加入不同掺量的相变材料和硅粉来研究混凝土的抗冲击性能,其中相变材料的掺量分别为0%、5%、10%、15%、20%,硅粉的掺量分别为0%、5%、10%、15%。试验通过控制硅粉的掺量来研究分析相变材料对混凝土抗冲击性能的影响,并通过控制相变材料的掺量来研究分析硅粉对混凝土抗冲击性能的影响。混凝土抗冲击试验以相变材料和硅粉掺量作为变量,试验共分为20组,每组三个试块,共计60个试块。试验结果分析表明:(1)素混凝土的抗冲击次数较小,表明其抗冲击性能较差,其初裂和最终破坏次数相近,裂缝出现后,会快速发展,混凝土试件迅速破坏,表明素混凝土具有较大的脆性。(2)加入相变材料的混凝土试验结果表明,相变材料掺量对混凝土抗冲击性能有一定影响,但不明显。当硅粉掺量为15%,相变材料掺量为0%时,混凝土抗冲击次数为268次;相变材料掺量为5%时,混凝土抗冲击次数为213.5次;当相变材料掺量为10%时,混凝土抗冲击次数为235次;当相变材料掺量为15%时,混凝土抗冲击次数为214.5次;当相变材料掺量为20%时,混凝土抗冲击次数为221.5 次。(3)硅粉的加入对混凝土抗冲击性能有明显的增强作用,根据不同硅粉掺量混凝土的试验结果分析可知,硅粉掺量对混凝土抗冲击性能有显著影响,当相变材料掺量一定时,硅粉均能有效的提高混凝土抗冲击性能,且随着硅粉掺量的增加,混凝土初裂和最终破坏冲击次数也不断提高。素混凝土抗冲击次数为72次;当相变材料掺量为0%、硅粉掺量为15%时,混凝土抗冲击次数为268次,抗冲击次数为素混凝土的3.72倍。当相变材料掺量分别为5%、10%、15%、20%,硅粉掺量为15%时,相变硅粉混凝土的抗冲击次数随相变材料掺量的增加呈现出先增大后减小的趋势,其抗冲击次数分别为素混凝土的1.84倍、1.59倍、3.06倍和2.41 倍。
[Abstract]:In order to improve the toughness of concrete, thermal insulation properties, and improve the fragility of the shortcomings, through the phase change material and adding different content of silica fume on the impact resistance of concrete, the content of the phase change material is 0%, respectively, 5%, 10%, 15%, 20%, the amount of silica powder was 0%, 5% and 10% respectively. 15%., test to study the effects of phase change material impact on the performance of concrete by volume control of silica fume, and the amount of control of phase change materials to study the effect of silica fume on the anti shock performance of concrete. The concrete impact test with phase change material and silica content as variables, were divided into 20 groups, each group three specimens, a total of 60 blocks. The results show that: (1) the number of smaller impact of plain concrete, showed that the impact of poor performance, the initial cracking and ultimate failure times are similar, cracks, will the rapid development of concrete specimens The rapid destruction of concrete, that has great brittleness. (2) the concrete test results show that adding phase change materials, phase change material content has certain effect impact on the performance of concrete, but not obvious. When the silicon content is 15%, the phase change material content is 0%, impact resistance of concrete is 268 times the number of phase transition; material content is 5%, impact resistance of concrete 213.5 times; when the phase change material content is 10%, impact resistance of concrete 235 times; when the phase change material content is 15%, impact resistance of concrete 214.5 times; when the phase change material content is 20%, impact resistance of concrete for the number 221.5. (3) the addition of silica fume has impact on the performance of concrete is enhanced, according to the different content of silica fume concrete results, have a significant effect of silica fume content impact on concrete performance, when a certain dosage of phase-change material, silica fume Can improve the impact resistance of concrete effectively, and with the increase of silica content, concrete cracking and ultimate failure impact number is also increasing. The concrete impact 72 times; when the phase change material content is 0%, silicon content is 15%, impact resistance of concrete is 268 times the number, impact the number is 3.72 times of the plain concrete. When the phase change material content is 5%, respectively, 10%, 15%, 20%, silicon content is 15%, transformation of silica fume concrete impact resistance times with increasing dosage of phase change materials showed first increased and then decreased, the impact number of times were 1.84 times in concrete is 1.59 times, 3.06 times and 2.41 times.

【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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