橡胶集料高强混凝土高温前后性能试验研究

发布时间：2018-04-09 13:29

  本文选题：橡胶集料　切入点：高强混凝土　出处：《辽宁工程技术大学》2015年硕士论文

【摘要】：橡胶集料高强混凝土是一种新型绿色环保建筑材料。在高强混凝土的基础上,掺入橡胶集料(等体积取代细集料砂子),改善高强混凝土高温爆破的缺陷,提高高强混凝土的高温性能。目前国内外主要研究的是掺橡胶集料(粉)的普通混凝土常温下的性能,对掺橡胶集料(粉)的高强混凝土高温下的性能研究鲜有报道。因此,从建筑减灾的角度出发,研究橡胶集料对高强混凝土高温前后性能的影响,不仅具有明确的工程应用前景,对混凝土技术的发展也有理论价值。论文引用细度模数作为橡胶集料粗细程度的评价指标,对橡胶集料高强混凝土高温前后性能进行了大量试验研究,包括混凝土拌合物稠度试验；高温前后混凝土表观密度试验；高温前后混凝土抗压强度及劈拉强度试验等。研究表明：①低掺适量的橡胶集料可以提高高强混凝土高温性能。用扫描电镜对橡胶硬化水泥浆体进行了高温前后的表征分析,从微观角度解释混凝土宏观力学性能变化。②通过三因素、四水平的正交试验,研究橡胶集料掺量、细度以及高强混凝土煅烧温度对高强混凝土性能的影响。发现掺“1.7%”特细橡胶集料可抑制高强混凝土高温爆裂,提高高强混凝土的残余强度,但其影响程度远不如煅烧温度的影响。初步建立了橡胶集料高强混凝土高温前后强度剩余百分率与橡胶集料掺量、细度和煅烧温度之间的回归方程,对工程应用有一定指导作用。③通过采用单因素对比试验,研究不同温度下(常温、200℃、400℃、600℃和800℃)C60高强混凝土和掺“1.7%”特细橡胶集料C60高强混凝土的耐久性能。结果表明,在常温和600℃煅烧温度后,掺“1.7%”特细橡胶集料的高强混凝土的耐久性能要好于未掺橡胶集料的高强混凝土的耐久性能,适量的橡胶细集料对高强混凝土常温下和600℃煅烧温度后的耐久性有提高作用。
[Abstract]:Rubber aggregate high strength concrete is a new kind of green environmental protection building material.On the basis of high strength concrete, rubber aggregate (equal volume instead of fine aggregate sand) is added to improve the defects of high strength concrete in high temperature blasting and to improve the high temperature performance of high strength concrete.At present, the main research at home and abroad is the performance of ordinary concrete mixed with rubber aggregate (powder) at room temperature, and there are few reports on the performance of high strength concrete mixed with rubber aggregate (powder) at high temperature.Therefore, from the point of view of building disaster reduction, studying the influence of rubber aggregate on the performance of high strength concrete before and after high temperature not only has a clear engineering application prospect, but also has theoretical value for the development of concrete technology.In this paper, the fineness modulus is used as the evaluation index of rubber aggregate thickness, and a large number of tests are carried out on the properties of rubber aggregate high strength concrete before and after high temperature, including the consistency test of concrete mixture, the apparent density test of concrete before and after high temperature, and the test of concrete apparent density before and after high temperature.Test of compressive strength and splitting tensile strength of concrete before and after high temperature.The results show that the high temperature properties of high strength concrete can be improved by low content of rubber aggregate.The rubber hardened cement paste was characterized before and after high temperature by scanning electron microscope (SEM). The change of macroscopic mechanical properties of concrete was explained from the microscopic point of view. 2. The content of rubber aggregate was studied by orthogonal test of three factors and four levels.Effects of fineness and calcination temperature of high strength concrete on properties of high strength concrete.It is found that the addition of "1.7%" ultra-fine rubber aggregate can restrain the high strength concrete cracking at high temperature and increase the residual strength of high strength concrete, but its influence degree is far less than that of calcination temperature.The regression equation between the residual percentage of strength of rubber aggregate high strength concrete before and after high temperature and the content, fineness and calcining temperature of rubber aggregate is established.The durability of C60 high strength concrete at different temperatures (200 鈩，

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