石化橡胶颗粒对橡胶混凝土力学性能的影响

发布时间：2018-02-27 06:37

本文关键词： 石化法橡胶混凝土均匀性抗压性能劈裂抗拉性能抗冻融性能　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：在混凝土中掺入橡胶颗粒不仅为解决废旧轮胎造成的黑色污染提供了一条新的途径,也在一定程度上提高了混凝土的韧性。但橡胶的掺入导致混凝土强度大幅度降低,严重限制了橡胶混凝土的应用及推广。这主要是因为橡胶颗粒属于憎水性合成胶体材料,密度较小且颗粒内部含有空气,故在水中易上浮。从而导致橡胶混凝土在制作过程中,橡胶颗粒在混凝土搅拌和振捣时,易分布不均匀,结坨,上浮等现象。若可以改变橡胶颗粒密度小,表面性质与混凝土骨料差异大的特性,便可以有效的规避橡胶颗混凝土的缺陷。课题组通过多次尝试得出一个可行方法:先用普通自来水浸泡橡胶颗粒,至颗粒完全下沉,颗粒表面无气泡。然后按体积比1:1把掺20%速凝剂的水泥和橡胶颗粒搅拌3min,之后加入适量的水再搅拌5min,然后用铲刀把混合物均匀的摊开在干净的水泥地上,等颗粒干燥后筛去多余粉末。再将其放入水中养护3天之后,需要使用时,取出颗粒过滤多余的杂质后,晾干即可掺入使用。由于处理后的颗粒表面呈灰白色,其外观如小石子一般,晃动发出砂石之声,故此法暂时称为“石化法”。为验证此法的可行性,对石化法橡胶混凝土进行对比试验测定其各项性能。本文试验以C40普通混凝土为基准,以5%、10%、15%掺量的橡胶颗粒等体积替代细骨料制成的橡胶混凝土为对照组,再取等体积5%、10%、15%掺量的橡胶颗粒进行石化法处理,制成石化法橡胶混凝土,通过抗压性能试验、劈裂抗拉性能试验、抗冻融性能试验,对石化法处理前后的橡胶混凝土基本性能进行了具体的研究。结果表明:1.在观察试件剖面颗粒分布情况时,石化法橡胶混凝土的均匀性明显好于普通橡胶混凝土。2.石化法橡胶混凝土,抗压和劈拉强度均较普通橡胶混凝土有大幅提升。3.在抗冻融试验中,石化法橡胶混凝土抗冻融性能介于基准混凝土和普通橡胶混凝土之间。这说明石化法处理工艺确实可以让橡胶颗粒在试件内分布更加均匀并改善橡胶混凝土的力学性能。
[Abstract]:Adding rubber particles into concrete not only provides a new way to solve the black pollution caused by waste tires, but also improves the toughness of concrete to a certain extent. This is mainly due to the fact that rubber particles belong to hydrophobic synthetic colloid materials, and because they have low density and contain air in the particles, they are easy to float in water, which leads to rubber concrete in the process of making. When the rubber particles are stirred and vibrated in concrete, they are easily distributed inhomogeneously, lump and float. If the rubber particle density is small and the surface properties are different from concrete aggregate, It can effectively avoid the defects of rubber pellet concrete. The team has tried many times to get a feasible method: first immerse rubber particles with ordinary tap water until the particles sink completely. There is no bubble on the surface of the particle. Then, at 1: 1 volume ratio, the cement and rubber particles with 20% accelerator are stirred for 3 minutes, then the proper amount of water is added for 5 minutes, and then the mixture is evenly spread out on the clean cement ground with a knife. After drying the particles, sift off the superfluous powder and put it into the water for 3 days. When it needs to be used, remove the particles to filter the excess impurities, dry them and mix them into the water. Because the surface of the treated particles is gray and white, Its appearance is like a pebble, and the sound of sand and gravel is emitted by shaking, so this method is temporarily called the "Petrochemical method." in order to verify the feasibility of this method, The properties of rubber concrete by petrochemical method were measured by contrast test. In this paper, the standard of C40 ordinary concrete was used as the benchmark, and the control group was made of rubber concrete which was made of 5% rubber particles and 15% rubber particles in equal volume instead of fine aggregate. Then the rubber particles of equal volume of 5% and 15% were taken for petrochemical treatment to make the petrochemical process rubber concrete. Through the compression performance test, the splitting tensile performance test, the freezing and thawing resistance test, The basic properties of rubber concrete before and after petrochemical treatment are studied in detail. The results show that: 1.When observing the particle distribution in the section of the specimen, The uniformity of rubber concrete by petrochemical method is obviously better than that of ordinary rubber concrete. The compressive and splitting tensile strength of rubber concrete by petrochemical method is much higher than that of ordinary rubber concrete. 3. In the test of freeze-thaw resistance, The freezing and thawing resistance of petrochemical rubber concrete is between standard concrete and ordinary rubber concrete, which shows that the petrochemical treatment process can make rubber particles distribute more evenly in the specimen and improve the mechanical properties of rubber concrete.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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