玄武岩纤维橡胶混凝土抗渗性及抗冲击性能研究

发布时间：2018-04-16 16:03

  本文选题：纤维橡胶混凝土 + 橡胶粉　； 参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：现如今,人们对于建筑工程的质量和安全要求越来越高。一方面工程的质量要对人身安全有所保障,另一方面还要尽可能符合国家提倡的绿色、环保、经济和可持续发展的战略要求。随着汽车数量的提升,废旧轮胎数量急剧上升,废旧轮胎的处理一直以来都是一个难题。对废旧轮胎进行回收,生产成为橡胶颗粒和细胶粉加入混凝土中,不仅能改善混凝土的一些性能,而且这种做法能有效的减少了污染,积极响应了国家可持续发展的政策。玄武岩纤维是一种近年来发展起来的新型、无机、绿色的高性能纤维材料,与现在研究较多的聚丙烯纤维和钢纤维相比,它的稳定性好、耐老化、电绝缘性、耐高温等许多优异的性能,对纤维混凝土的使用寿命和耐久性能有很大的提高。基于以上两种材料的性质,在普通混凝土中同时掺入橡胶粉和玄武岩纤维,得到新型复合型混凝土-玄武岩纤维橡胶混凝土,在不同水灰比(0.32和0.38)条件下,对不同掺量、不同长度玄武岩纤维橡胶混凝土的力学性能、抗渗性能和抗冲击性能进行试验研究。研究表明,随着橡胶粉的掺入,混凝土的力学性能,尤其是抗压强度降低程度较大,而抗渗性、抗冲击性能显著提高。在此基础上掺入玄武岩纤维,对混凝土有较好的阻裂和增强增韧的效果。综合各项性能来看,两种水灰比混凝土的纤维最优掺量有所不同,水灰比为0.32时最优掺量为0.12%左右,而水灰比提高到0.38,则最优掺量为0.10%。纤维的长度越短,其抗冲击性能越好。最后通过Abaqus有限元软件对混凝土抗冲击过程进行模拟,得出在相同冲击荷载作用下,纤维混凝土的损伤增长率比普通混凝土降低。最后通过纤维间距理论对不同水灰比条件下,纤维最优掺量的不同进行初步探讨和数值分析。
[Abstract]:Nowadays, the quality and safety of construction projects are becoming more and more demanding.On the one hand, the quality of the project should be guaranteed to the personal safety, on the other hand, it should meet the strategic requirements of green, environmental protection, economy and sustainable development advocated by the state as much as possible.With the increase of the number of cars, the number of waste tires has increased sharply, and the disposal of used tyres has been a problem all along.Recycling waste tires and producing rubber particles and fine rubber powder into concrete can not only improve some properties of concrete, but also reduce pollution effectively and respond positively to the national policy of sustainable development.Basalt fiber is a new kind of high performance fiber material which has been developed in recent years. Compared with polypropylene fiber and steel fiber, it has good stability, aging resistance and electrical insulation.Many excellent properties, such as high temperature resistance, can greatly improve the service life and durability of fiber reinforced concrete.Based on the properties of the above two kinds of materials, rubber powder and basalt fiber are mixed in ordinary concrete at the same time, and a new type of composite concrete-basalt fiber rubber concrete is obtained. Under different water / cement ratio of 0.32 and 0.38), the content of rubber concrete is different.The mechanical properties, impermeability and impact resistance of basalt fiber rubber concrete with different lengths were studied.The results show that with the addition of rubber powder, the mechanical properties of concrete, especially the compressive strength, decrease greatly, while the impermeability and impact resistance of concrete are improved significantly.On this basis, basalt fiber is added to the concrete, which has a good effect of preventing crack and strengthening and toughening.According to the comprehensive properties, the optimum fiber content of the two kinds of water-cement ratio concrete is different. When the water-cement ratio is 0.32, the optimal content is about 0.12%, while the water-cement ratio is increased to 0.38, the optimal content is 0.10%.The shorter the fiber length, the better the impact resistance.Finally, the impact resistance process of concrete is simulated by Abaqus finite element software. It is concluded that the damage growth rate of fiber reinforced concrete is lower than that of ordinary concrete under the same impact load.Finally, through the theory of fiber spacing, the difference of optimal fiber content under different water-cement ratio is discussed and analyzed numerically.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528.57

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