钢渣微粉改性碳纤维混凝土的电热效应及温升试验研究

发布时间：2018-02-27 16:11

本文关键词： CFRC 电热效应钢渣微粉电极温升　出处：《郑州大学》2015年硕士论文　论文类型：学位论文

【摘要】：本课题属郑州市科技领军人才项目:碳纤维智能混凝土性能研究及在结构健康监测中的应用研究(131TLJRC674)。将短切碳纤维掺加到混凝土中,可使混凝土具有良好的导电性能。在外电场作用下,碳纤维混凝土(CFRC)可以产生电热效应,用于室内采暖和路面的融雪化冰。但碳纤维混凝土的制备成本高且施工过程中电极布置复杂等不利因素阻碍了其推广使用。针对这两方面的问题,本文通过掺加钢渣微粉来减小碳纤维的掺量,以降低制备成本;通过改进电极的布置来简化施工,以期推动碳纤维混凝土在工程中的应用。本文的主要研究内容如下:(1)研究不同掺量碳纤维与钢渣微粉在混凝土中的耦合作用对混凝土电阻率的影响。试验结果表明:对于相同的电阻率指标,掺加钢渣微粉可以减小碳纤维混凝土中碳纤维的掺量,并且碳纤维体积率为0.58%、钢渣微粉掺量为水泥质量20%的碳纤维混凝土电阻率满足融雪化冰的要求且稳定性良好。(2)进行不同电极下钢渣微粉改性碳纤维混凝土板的升温对比试验。试验结果表明:钢渣微粉改性碳纤维混凝土板中采用闭合圆环形电极的升温速率较其它两种快,并且板表面的温度分布较均匀。(3)进行不同工况下钢渣微粉改性碳纤维混凝土板的升温试验。研究烘干与水饱和状态、隔热与不隔热状态对混凝土板升温速率的影响,以及在不同温度下输入功率与混凝土板的升温速率之间的关系。试验结果表明:烘干状态和隔热状态下的混凝土板升温速率较水饱和状态和不隔热状态更快,在不同的温度下通电2个小时过程中混凝土板表面的温度与通电时间均呈线性关系。
[Abstract]:This subject belongs to the Zhengzhou Science and Technology leadership Project: research on the performance of carbon fiber intelligent concrete and its application in structural health monitoring. Add short cut carbon fiber to concrete, 131TLJRC674. Carbon fiber reinforced concrete (CFRC) can produce electrothermal effect under the action of external electric field. It is used for indoor heating and snow melting and ice melting on pavement. However, the high cost of carbon fiber concrete preparation and the complex electrode arrangement in the construction process hinder its popularization and use. In this paper, by adding steel slag powder to reduce the amount of carbon fiber, to reduce the cost of preparation, by improving the arrangement of electrodes to simplify the construction, In order to promote the application of carbon fiber reinforced concrete in engineering, the main contents of this paper are as follows: 1) to study the effect of coupling of carbon fiber and steel slag powder in concrete on the resistivity of concrete. Ming: for the same resistivity index, The addition of steel slag powder can reduce the amount of carbon fiber in carbon fiber concrete. And the resistivity of carbon fiber concrete with carbon fiber volume ratio of 0.58 and steel slag micro-powder of 20% cement mass meets the requirement of snow melting and ice melting and has good stability.) the steel slag micro-powder modified carbon fiber reinforced concrete slab with different electrodes is raised. The experimental results show that the heating rate of the closed ring electrode in carbon fiber reinforced concrete slab modified by steel slag powder is faster than that of the other two. And the temperature distribution on the surface of the slab is more uniform. The temperature rise test of carbon fiber reinforced concrete slab modified by steel slag powder under different working conditions is carried out. The effects of drying and water saturation state, heat insulation and non-heat insulation state on the temperature rise rate of concrete slab are studied. And the relationship between the input power and the heating rate of concrete slabs at different temperatures. The experimental results show that the heating rates of concrete slabs under the condition of drying and heat insulation are faster than those of saturated and uninsulated concrete slabs. The surface temperature of concrete slabs is linearly related to the time of electrification at different temperatures during two hours of electrification.
【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】：TU528.572

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