电场活化水拌和水泥混凝土性能的研究

发布时间：2018-02-09 23:51

本文关键词： 混凝土电场活化水性能改善理论分析试验验证　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：为了改善水泥混凝土的性能,目前最常用的方法就是在搅拌过程中加入混凝土外加剂和矿物掺合料。混凝土外加剂和矿物掺合料的添加虽然能一定程度地改善混凝土的性能,但同时也带来了诸多问题(如配料成本增加等)。基于磁化水拌和水泥混凝土成功的试验研究和应用实例,以及电液压脉冲活化水拌和水泥混凝土成熟的试验研究,加之电场活化水改善水泥砂浆综合性能的试验验证,本文展开了利用电场活化水拌和水泥混凝土的研究,以探究电场活化水对于水泥混凝土性能的影响效果。本文整体采用了理论分析结合试验验证的方法。首先理论分析了水的结构特性,阐明了水能被电场能量活化的可行性和机理;借鉴磁化水、电液压脉冲活化水和电场活化水拌和水泥混凝土(或水泥砂浆)的成功经验,利用实验室现有的两套电场活化水生产装置分别以静置和循环流动的方式对普通自来水进行了活化处理(直至活化水的理化性质趋于稳定,不再有大幅的变化),分析对比了四种电场活化水相对于普通水理化性质的改变程度,最终选择采用高频电场以循环流动活化处理方式生产的活化水进行水泥混凝土拌和的试验研究。然后理论分析了水泥的水化反应、水泥混凝土性能及其各自的影响因素,对高频电场活化水能够加快水泥的水化反应进而改善混凝土的性能进行了推理阐释。最后设计实施了高频电场活化水与普通水拌和水泥混凝土的对比试验和时效性试验,验证了高频电场活化水对于水泥混凝土性能的改善效果。试验结果显示:相比于普通水,高频电场活化水在改善新拌混凝土混合料的流动性、含气量、容重和硬化混凝土的抗压强度以及自身时效性方面,对于C20和C40混凝土有明显的效果,但对于C30凝土,效果则不太明显;高频电场活化水在改善新拌混凝土混合料的保水性、粘聚性以及硬化混凝土的微观结构方面,对于三种强度等级的混凝土均有明显效果;高频电场活化水在改善新拌混凝土混合料的均匀性方面,没有明显的规律性,且对于不同强度等级的混凝土,其效果也各有差异。
[Abstract]:In order to improve the performance of cement concrete, the most commonly used method is to add concrete admixture and mineral admixture in the mixing process. Although the addition of concrete admixture and mineral admixture can improve the performance of concrete to a certain extent, But at the same time, it also brings many problems (such as increasing burden cost, etc.) based on the successful experimental research and application examples of magnetized water mixing cement concrete, as well as the experimental research on the maturation of electro-hydraulic pulse activated water mixing cement concrete, In addition to the test verification of improving the comprehensive performance of cement mortar by using electric field activated water, the study of using electric field activated water to mix cement concrete has been carried out in this paper. In order to explore the effect of electric field activated water on the performance of cement concrete, the method of theoretical analysis and experimental verification is adopted in this paper. Firstly, the structure characteristics of water are theoretically analyzed. The feasibility and mechanism of water activation by electric field energy are expounded, and the successful experience of mixing cement concrete (or cement mortar) with magnetized water, electro hydraulic pulse activated water and electric field activated water is described. In this paper, two sets of electric field activated water production units are used in laboratory to treat common tap water by static and circulating flow respectively (until the physical and chemical properties of activated water tend to be stable. There is no significant change in the physical and chemical properties of four kinds of electric field activated water compared with ordinary water. Finally, the experimental study of cement concrete mixing is carried out by using activated water produced by high frequency electric field and cyclic flow activation treatment. Then, the hydration reaction of cement, the performance of cement concrete and their respective influencing factors are analyzed theoretically. The high frequency electric field activated water can accelerate the hydration reaction of cement and improve the performance of concrete. Finally, the contrast test and time effect test between high frequency electric field activated water and ordinary water mixing cement concrete are designed and implemented. The experimental results show that the high frequency electric field activated water can improve the fluidity and air content of fresh concrete mixture, compared with ordinary water, the high frequency electric field activated water can improve the performance of cement concrete. In terms of bulk density and compressive strength of hardened concrete as well as its own timeliness, it has obvious effect on C20 and C40 concrete, but not on C30 concrete. High frequency electric field activated water can improve the water retention of fresh concrete mixture. In terms of cohesion and microstructure of hardened concrete, it has obvious effect on three kinds of strength grade concrete, and high frequency electric field activated water has no obvious regularity in improving the uniformity of fresh concrete mixture. And for the different strength grade concrete, its effect also has the difference.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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