改性橡胶混凝土的抗冻性能研究

发布时间：2018-03-18 20:19

本文选题：橡胶混凝土　切入点：改性剂　出处：《郑州大学》2015年硕士论文　论文类型：学位论文

【摘要】：橡胶混凝土的出现为解决废旧轮胎造成的黑色污染提供了一条新的途径。已有的研究表明,橡胶颗粒的掺入会引起混凝土的强度及耐久性能的改变,若对橡胶颗粒采用改性剂处理,制成改性橡胶混凝土,则能够减少橡胶混凝土强度的下降幅度,提高其耐久性能。本文在课题前期研究成果的基础上,深入研究了Na OH改性橡胶混凝土、KH570改性橡胶混凝土及二者复合改性橡胶混凝土的抗压及抗冻性能。得到的主要结论为:(1)掺入橡胶颗粒后,基准橡胶混凝土较基准混凝土的抗压强度下降,且橡胶颗粒粒径越小,抗压强度下降幅度越大。(2)改性橡胶混凝土的抗压强度试验结果分析表明,改性剂的改性效果受橡胶颗粒的材料来源、材料成分、生产工艺的影响较大。(3)掺入橡胶颗粒可以改善混凝土的抗冻性能,在60目、1-3mm及3-6mm三种粒径中,60目胶粉对于抗冻性能的改善效果最为显著。(4)改性橡胶混凝土较基准橡胶混凝土的抗冻性能有明显提高,在Na OH溶液、KH570溶液及二者复合三种改性剂中,复合改性剂的效果最为显著。改性橡胶混凝土试件成型后,表面气孔较多,分析认为改性剂引入了大量气泡,这导致了抗压强度的下降,却提高了抗冻性能。(5)与基准混凝土相比,橡胶混凝土及改性橡胶混凝土无论其强度是否降低,但其抗冻性能都有所改善。
[Abstract]:The appearance of rubber concrete provides a new way to solve the black pollution caused by waste tires. Previous studies have shown that the addition of rubber particles can change the strength and durability of concrete. If rubber particles are treated with modifier to make modified rubber concrete, the strength of rubber concrete can be reduced and its durability can be improved. The compressive and freezing properties of NaOH modified rubber concrete and its composite modified rubber concrete, NaOH modified rubber concrete and its composite modified rubber concrete, were studied. The compressive strength of the standard rubber concrete is lower than that of the reference concrete, and the smaller the size of the rubber particle, the greater the decrease in the compressive strength of the modified rubber concrete. The modification effect of the modifier is greatly affected by the material source, material composition and production process of rubber particles. The addition of rubber particles can improve the frost resistance of concrete. The effect of 60 mesh rubber powder on the improvement of freezing resistance was most remarkable in the three sizes of 60 mesh (1-3mm) and 3-6mm (3.6mm). The antifreeze property of modified rubber concrete was obviously improved compared with that of the reference rubber concrete. In NaOH solution, KH570 solution and the three kinds of modifiers combined with the two, the antifreeze property of modified rubber concrete was obviously improved. The effect of the compound modifier is the most obvious. After the modified rubber concrete specimen is formed, there are more pores on the surface. The analysis shows that the modifier introduces a large number of bubbles, which leads to the decrease of the compressive strength. Compared with the reference concrete, the strength of rubber concrete and modified rubber concrete is decreased or not, but the frost resistance of rubber concrete and modified rubber concrete is improved.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528.41

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