改性橡胶混凝土的配制与物理力学性能研究

发布时间：2018-04-28 19:09

本文选题：改性橡胶混凝土 + 配制方法　；参考：《郑州大学》2015年硕士论文

【摘要】：通过改性剂处理橡胶颗粒,能够增强橡胶颗粒与水泥石的粘结作用,提高橡胶混凝土的各项性能。前期试验成果显示,改性橡胶混凝土具有良好的抗冻性,在水利工程中有较好的应用前景,但对其强度等力学性能的研究尚不完善。因此,本文在水利公益性行业科研专项经费项目(201301027)的资助下,对改性橡胶混凝土的配制方法和物理力学性能进行了研究。主要工作和结论如下:(1)研究了改性橡胶混凝土的配制方法。首先对项目的强度目标进行分析,得到改性橡胶混凝土配合比的确定原则:使基准橡胶混凝土与基准混凝土的强度比为0.71~0.83。然后根据不同橡胶粒径和掺量的橡胶混凝土的坍落度和强度试验,确定了改性橡胶混凝土的配合比。最后根据已有的试验成果,确定了橡胶混凝土的3种改性方式:Na OH改性、KH570改性和复合改性。(2)试验研究了改性橡胶混凝土的拌和物性能,发现改性橡胶混凝土较基准橡胶混凝土拌和物密度下降、坍落度升高。Na OH改性橡胶混凝土、KH570改性橡胶混凝土和复合改性橡胶混凝土的拌和物密度下降的幅度分别为0.59%、3.1%、2.3%,坍落度上升的幅度分别为24.4%、75.6%、70.7%。(3)试验研究了改性橡胶混凝土的强度。结果显示,Na OH改性橡胶混凝土和复合改性橡胶混凝土的强度较基准橡胶混凝土稍有下降,其中Na OH改性橡胶混凝土的28d立方体抗压强度、劈拉强度和轴压强度分别为基准橡胶混凝土的94.9%、98.8%和95.1%,复合改性橡胶混凝土分别为基准橡胶混凝土的88.5%、93.4%和90.9%。KH570改性橡胶混凝土的强度与基准橡胶混凝土相当,其分别为基准橡胶混凝土的100.3%、98.4%和102.7%。分析认为,改性剂在增强橡胶颗粒与水泥石粘结作用的同时会削弱混凝土的密实性。(4)试验研究了改性橡胶混凝土的应力应变特性,采用过镇海的混凝土本构模型拟合了改性橡胶混凝土的本构方程,理论公式与试验结果吻合较好。与普通橡胶混凝土相比,改性橡胶混凝土峰值应变增加、弹性模量下降。Na OH改性橡胶混凝土、KH570改性橡胶混凝土和复合改性橡胶混凝土的峰值应变提高的幅度分别为19.7%、0.5%和9.8%,弹性模量下降的幅度分别为13.5%、3.3%和10.2%。
[Abstract]:By treating rubber particles with modifier, the bond between rubber particles and cement stone can be strengthened, and the properties of rubber concrete can be improved. The preliminary test results show that the modified rubber concrete has good frost resistance and has a good application prospect in water conservancy projects, but the study on its strength and other mechanical properties is not perfect. Therefore, the preparation method and physical and mechanical properties of modified rubber concrete are studied in this paper, supported by the special research project of water conservancy and public welfare industry (201301027). The main work and conclusion are as follows: 1) the preparation method of modified rubber concrete is studied. Firstly, the strength target of the project is analyzed, and the principle of determining the mix ratio of modified rubber concrete is obtained: the strength ratio of the standard rubber concrete to the standard concrete is 0.71g 0.83. Then according to the slump and strength test of rubber concrete with different rubber particle size and content, the mix ratio of modified rubber concrete was determined. Finally, according to the existing experimental results, three kinds of modification methods of rubber concrete were determined, that is, the modification of KH 570 and the modification of KH 570 and compound modification of rubber concrete. The mixing properties of modified rubber concrete were studied. It is found that the density of the modified rubber concrete is lower than that of the reference rubber concrete. The strength of modified rubber concrete was studied by means of increasing slump. NaOH modified rubber concrete and compound modified rubber concrete. The decrease range of mixing density was 0.59 and 3.1and 2.3.The slump increased by 24.45.6and 70.7. The results showed that the strength of Na-OH modified rubber concrete and compound modified rubber concrete was slightly lower than that of reference rubber concrete, and the 28d cube compressive strength of NaOH modified rubber concrete was found. The splitting tensile strength and axial compression strength of the standard rubber concrete are 94.998% and 95.1% of the standard rubber concrete, respectively. The composite modified rubber concrete is 88.593 4% of the reference rubber concrete and the strength of the 90.9%.KH570 modified rubber concrete is the same as that of the reference rubber concrete. It is 98.4% of the standard rubber concrete and 102.7% of the standard rubber concrete. The analysis shows that the modifier can weaken the compactness of concrete while reinforcing the bond between rubber particles and cement stone. The stress-strain characteristics of modified rubber concrete are studied. The constitutive equation of modified rubber concrete is fitted by using the constitutive model of concrete over Zhenhai. The theoretical formula is in good agreement with the experimental results. Compared with ordinary rubber concrete, the peak strain of modified rubber concrete increases. The peak strain of the modified rubber concrete and the composite modified rubber concrete were increased by 19.7% and 9.8%, respectively, and the decrease of the elastic modulus were 13.5% and 10.2%, respectively.
【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

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