橡胶混凝土与普通混凝土粘结性能试验研究

发布时间：2018-01-03 03:06

本文关键词：橡胶混凝土与普通混凝土粘结性能试验研究　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：橡胶混凝土(Rubber Concrete),又称作弹性混凝土(Elastic Concrete),就是在普通混凝土中掺入不同粒径的橡胶颗粒(主要来自废旧轮胎)形成的一种新型复合材料。为了研究不同橡胶颗粒粒径和不同橡胶掺量及复合改性橡胶制成的橡胶混凝土在不同界面剂类型时与普通混凝土的粘结性能,推动橡胶混凝土在工程中的应用,本文研究了橡胶颗粒粒径为1~3mm和3~6mm两种,橡胶掺量为5%、10%、15%、20%、30%五种,未改性橡胶和复合改性橡胶在无界面剂、水泥净浆界面剂、环氧界面剂三种界面剂类型时,橡胶混凝土与普通混凝土的粘结性能,主要内容及结论见下:1、通过126个150mm×l50mm×150mm立方体试件抗压、劈裂抗拉伴随试验,研究橡胶颗粒粒径、橡胶掺量和复合改性橡胶对橡胶混凝抗压、劈拉强度的影响。试验结果表明:橡胶颗粒粒径与橡胶混凝土抗压、劈拉强度的关系较为复杂,并不是橡胶颗粒粒径大的强度高;随着橡胶掺量的增加,橡胶混凝土的抗压、劈拉强度均呈现逐渐下降的趋势;复合改性橡胶混凝土抗压、劈拉强度的降低规律与未改性橡胶混凝土抗压、劈拉强度的降低规律一致:随着橡胶掺量的增加逐渐下降,且复合改性橡胶混凝土的抗压、劈拉强度有一定程度的提高。2、通过189个150mm×l50mm×150mm立方体粘结试件的劈拉试验和189个100mm×l00mm×300mm棱柱体粘结试件的斜剪试验,研究橡胶颗粒粒径、橡胶掺量、界面剂类型以及复合改性橡胶对橡胶混凝土与普通混凝土粘结劈拉、斜剪性能的影响。试验结果表明:各影响因素对混凝土粘结试件的粘结劈拉强度和粘结斜剪强度的影响规律有比较一致的结论。三种界面剂类型的粘结试件受拉、受压剪破坏时都沿粘结面发生破坏。(1)橡胶颗粒粒径与混凝土粘结试件的粘结劈拉强度、粘结斜剪强度的关系都较为复杂,随橡胶掺量、界面剂类型的不同而不同;(2)总体来说,随着橡胶掺量的增加,粘结试件的粘结劈拉强度呈现先上升后下降的趋势,粘结斜剪强度呈现逐渐下降的趋势;(3)三种界面剂类型中,混凝土粘结试件的粘结劈拉强度都小于新浇混凝土整体劈拉强度。同一种橡胶颗粒粒径,涂刷环氧界面剂时粘结劈拉强度均最大;涂刷水泥净浆界面剂与不涂刷界面剂时粘结劈拉强度相差不大;对粘结斜剪强度来说,涂刷环氧界面剂时最高,涂刷水泥净浆时次之,不涂刷界面剂时最低;(4)整体而言,复合改性后粘结劈拉强度、粘结斜剪强度与橡胶掺量的关系均跟未改性时大致相同且前者有不同程度的提高;(5)通过显著性分析得出,各影响因素对粘结劈拉强度和粘结斜剪强度的显著性一致:橡胶掺量和界面剂类型影响显著,橡胶颗粒粒径和复合改性橡胶影响不显著。3、通过对掺入1~3mm橡胶颗粒粒径10%和20%掺量时粘结试件切片进行扫描电镜(SEM)可以看到,涂刷水泥净浆界面剂时强效应层水化结晶体发育良好,结构密实,在10%橡胶掺量时有缝隙,在20%橡胶掺量时未见明显缝隙,这是由于橡胶颗粒的存在,吸收了一部分由干缩产生的应变能;涂刷环氧界面剂时,渗透层、强效应层发育较好,且强效应层与渗透层之间衔接紧密,新老粘结界面粘结效果良好。
[Abstract]:Rubber concrete (Rubber Concrete), also known as elastic concrete (Elastic Concrete), is in the ordinary concrete mixed with different particle size of rubber particles (mainly from waste tires) a new type of composite materials. In order to form and different contents of rubber and rubber modified concrete made of rubber and common bond performance concrete in different types of interface agent of different rubber particle size, promote the application of rubber concrete in engineering, this paper studies the rubber particle size of 1~3mm and 3~6mm two, the rubber content was 5%, 10%, 15%, 20%, 30%, five, the unmodified rubber and modified rubber in unbounded surface agent, cement paste interfacial agent, epoxy interface agent three interface agent, bonding properties of rubber concrete and ordinary concrete, the main contents and conclusions below: 1, by 126 150mm * l50mm * 150mm cube compressive, splitting With the tensile test, the particle size of rubber, rubber content and composite modified rubber to rubber concrete compressive strength, splitting tensile strength effect. The experimental results show that the rubber particles and rubber concrete compressive strength, splitting tensile strength of the relationship is more complex, not large rubber particles with high strength; the addition of rubber powder, rubber concrete compressive strength, splitting tensile strength decreased; composite rubber modified concrete compressive, splitting tensile strength and decrease of rubber modified concrete compressive and splitting tensile strength decreased by law: with the increase of rubber content gradually decreased, and the composite modification rubber concrete compressive strength, splitting tensile strength is improved to a certain degree by.2, 189 150mm * l50mm * 150mm Cube Specimens splitting test and 189 100mm * l00mm * 300mm prism bonded test shear test piece of rubber, Rubber particle size, rubber content, interface agent and composite modified rubber on the adhesion of the rubber concrete and ordinary concrete splitting, the effect of shear performance. The experimental results show that the influencing factors have a more consistent conclusion of the concrete specimen bond splitting tensile strength and bonding strength of the influence of oblique shear three. Bonding interface agent type specimen tensile, compression shear failure along the bonding surface damage. (1) rubber particles and concrete bonding splitting tensile strength test piece bonding, bonding shear strength of inclined relations are more complex, with the rubber content, different types of interface agent; (2) overall, with the increase of rubber content, adhesive specimen bond splitting tensile strength decreases, shear strength of bond decreased gradually; (3) three kinds of interface agent, concrete specimen bond splitting The strength of concrete is less than the overall tensile strength. The same kind of rubber particles, brushing epoxy interfacial agent when the bond splitting tensile strength was maximum; brush cement paste interface agent and coating interface agent when the bond splitting tensile strength difference; oblique shear strength of adhesive, brushing epoxy adhesive agent highest. When the coating of cement paste, not brushing interface agent is the lowest; (4) overall, modified adhesive splitting tensile strength, shear strength and bond between the rubber content are not modified with roughly the same and the former increased to some extent; (5) through significant analysis obviously, the consistency of the influencing factors on bond splitting tensile strength and shear strength of inclined Bond: influence of rubber content and interfacial agent type significantly, rubber particles and composite modified rubber is not significantly affected by.3, the incorporation of 1~3mm rubber particle size 10% and 20% dosage stick Node test using scanning electron microscopy (SEM) can see a slice, brushing the cement paste interface agent should be powerful hydration crystal layer growth is good, there is a gap in a dense structure, 10% rubber dosage, 20% rubber dosage has no obvious gap, this is due to the presence of rubber particles, absorb a part of the strain produced by dry shrinkage; brushing epoxy adhesive agent, permeable layer, layer should be better developed potent and powerful, should be connected between the layers and permeability layer closely, new and old bond bond effect is good.

【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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