掺早强剂的再生混凝土耐久性试验研究

发布时间：2018-01-12 10:13

本文关键词：掺早强剂的再生混凝土耐久性试验研究　出处：《武汉工程大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着中国经济和城镇化的快速发展,每年因为拆除和旧建筑物改造加固而产生大量的废弃混凝土。若处理不好,环境问题会十分突出,也会对社会产生一定的危害;如果处理的适当,可以将这些建筑垃圾变废为宝,既可以节省资源也可以产生经济效益。另一方面不断开采利用,自然资源日益枯竭,基于可持续发展战略上来看,也需要将废弃的建筑垃圾循环利用起来。要在工程中安全的使用这些再生混凝土,研究再生混凝土的强度和耐久性就很有必要。本文通过对比试验研究早强剂对再生混凝土强度、抗冻性能和抗渗性能的影响,并取得了一些成果。本文根据再生粗骨料的不同取代率和三种不同的水胶比对再生混凝土进行了试验设计,并对比在同等条件下未掺加早强剂的再生混凝土,研究再生混凝土强度,得出了早强剂、再生粗骨料取代率和水胶比对再生混凝土强度的影响。本文根据配制的再生混凝土研究其抗冻性能,得出早强剂对再生混凝土的抗冻性能有一定的作用;水胶比和再生粗骨料取代率与再生混凝土的抗冻性也有关,并且与水胶比和再生粗骨料取代率成负相关,即再生混凝土的抗冻性能随着水胶比和再生粗骨料取代率的增加而变差。本文根据配制的再生混凝土研究其抗渗性能,得出早强剂可以改善再生混凝土的抗渗性能;再生粗骨料取代率和水胶比与再生混凝土抗渗性成反比。
[Abstract]:With the rapid development of China's economy and urbanization, a large number of abandoned concrete are produced every year because of demolition and reinforcement of old buildings. Will also produce certain harm to the society; If the treatment is appropriate, the construction waste can be converted into a treasure, which can save resources and produce economic benefits. On the other hand, the continuous exploitation and utilization of natural resources are increasingly depleted. Based on the sustainable development strategy, it is also necessary to recycle the waste construction waste and use the recycled concrete safely in the project. It is necessary to study the strength and durability of recycled concrete. In this paper, the effect of early strength agent on strength, frost resistance and permeability of recycled concrete is studied through comparative tests. According to the different substitution rate of recycled coarse aggregate and three different water / binder ratio, the test design of recycled concrete is carried out, and the recycled concrete without early strength agent is compared under the same conditions. The strength of recycled concrete is studied, and the influence of early strength agent, replacement rate of recycled coarse aggregate and ratio of water to glue on strength of recycled concrete is obtained. In this paper, the frost resistance of recycled concrete is studied according to the prepared recycled concrete. It is concluded that the early strength agent has a certain effect on the frost resistance of recycled concrete. The ratio of water to binder and the replacement rate of recycled coarse aggregate are also related to the frost resistance of recycled concrete, and are negatively correlated with the ratio of water to binder and the replacement rate of recycled coarse aggregate. That is, the frost resistance of recycled concrete becomes worse with the increase of water-binder ratio and the replacement rate of recycled coarse aggregate. This paper studies the impermeability of recycled concrete based on the prepared recycled concrete. It is concluded that early strength agent can improve the impermeability of recycled concrete. The substitution rate of recycled coarse aggregate and the ratio of water to binder are inversely proportional to the impermeability of recycled concrete.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU528

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