再生粗骨料强化预处理对高性能再生混凝土细观结构影响的试验研究

发布时间：2018-02-28 12:49

本文关键词： 再生骨料强化预处理高性能再生混凝土界面过渡区基本力学性能细观结构　出处：《福州大学》2013年硕士论文　论文类型：学位论文

【摘要】：随着社会经济的发展和人们环保意识的增强,走可持续发展道路逐渐成为全世界的共识。其中建筑业长期以来的高消耗、高污染逐渐被重视,再生混凝土因此应运而生。目前国内外关于再生混凝土的研究已经有了较大的发展,但仍存在许多不足之处。鉴于此,本文主要进行了再生粗骨料的强化预处理试验研究,对强化处理的高性能再生混凝土的基本力学性能及细观结构进行试验研究。主要的工作和结论如下：1、通过对再生粗骨料进行强化预处理试验,研究了各种强化预处理方法对再生粗骨料基本性能的影响。试验结果表明强化预处理方法能在一定的程度上改善再生粗骨料的基本性能。2、进行再生混凝土基本力学性能试验,分析了各种强化预处理方法对高性能再生混凝土基本力学性能的影响,并与高性能混凝土及再生骨料未强化预处理的高性能再生混凝土进行比较。试验结果表明,采用水泥外掺硅粉浆液和聚乙烯醇溶液对再生粗骨料强化预处理能有效地提高高性能再生混凝土的基本力学性能。3、通过扫描电镜试验,分析了强化预处理方法对高性能再生混凝土细观形貌的影响,并与高性能混凝土及未强化预处理的高性能再生混凝土进行比较。试验结果表明,纯水泥浆液强化处理对再生骨料-水泥石的界面形貌的改善效果不明显；采用水泥外掺硅粉浆液强化处理方法时,从早龄期开始就对再生骨料-水泥石的界面形貌发挥明显的改善作用；采用聚乙烯醇溶液强化处理方法时,7d龄期后再生骨料-水泥石的界面过渡区形貌改善效果较为明显。4、通过以上各种试验结果表明,水胶比为1.0的水泥外掺硅粉浆液和浓度为10%的聚乙烯醇溶液对高性能再生混凝土强度的提高和界面过渡区形貌的改善效果最佳。因此,这两种强化方法可作为实现再生混凝土高强化的一个重要途径。
[Abstract]:With the development of social economy and the enhancement of people's awareness of environmental protection, it has gradually become the consensus of the world to take the road of sustainable development. At present, the research on recycled concrete has made great progress at home and abroad, but there are still many shortcomings. In view of this, this paper mainly carries on the intensive pretreatment test of recycled coarse aggregate. The basic mechanical properties and meso-structure of reinforced high performance recycled concrete are studied. The main work and conclusions are as follows: 1. Through the intensive pretreatment test of recycled coarse aggregate, The effects of various reinforcement pretreatment methods on the basic properties of recycled coarse aggregate are studied. The experimental results show that the enhanced pretreatment method can improve the basic properties of recycled coarse aggregate to a certain extent and test the basic mechanical properties of recycled concrete. The effects of various reinforcement pretreatment methods on the basic mechanical properties of high performance recycled concrete are analyzed and compared with those of high performance recycled concrete and recycled aggregate unreinforced recycled concrete. The basic mechanical properties of high performance recycled concrete can be effectively improved by using cement mixed with silica fume slurry and polyvinyl alcohol solution to strengthen pretreatment of recycled coarse aggregate. The effect of strengthening pretreatment method on the micromorphology of high performance recycled concrete is analyzed and compared with that of high performance concrete and high performance recycled concrete without strengthening pretreatment. The surface morphology of regenerated aggregate and cement stone is not improved obviously by strengthening treatment of pure cement slurry, and when cement is mixed with silica fume, the surface morphology of recycled aggregate is not improved obviously. The interface morphology of recycled aggregate and cement stone has been improved obviously since the early age. The morphology of interfacial transition zone of regenerated aggregate and cement stone was improved obviously after 7 days of treatment with polyvinyl alcohol solution. The improvement of strength and the morphology of interfacial transition zone of high performance recycled concrete is best by adding silica fume slurry to cement with water-binder ratio 1. 0 and polyvinyl alcohol solution with concentration of 10%. These two strengthening methods can be used as an important way to realize high strength of recycled concrete.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528

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