石墨水泥砂浆注浆钢纤维混凝土融雪及有限元模拟
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摘要
冬季冰雪严重影响了机场跑道、道路和桥梁的畅通,给人民生产生活带来巨大影响。传统的融雪化冰方法存在各种弊端,导电混凝土法是一种新型的环保、高效的方法。GSIFCON是一种水泥基复合材料,是在水泥砂浆基础上加入钢纤维、石墨和阻锈剂等组成的复相导电混凝土。本文在前人研究的基础上,对GSIFCON板电阻稳定、电热升温、冬季室外融雪进行了实验研究,同时根据传热学理论和材料参数,建立有限元模型进行了融雪实验模拟。本文的研究内容主要包括以下几个方面:
1.通过对GSIFCON板在不同功率下多次通电实验,得出了GSIFCON在不同温度条件下的电阻变化规律;同时实验研究发现融雪实验前后,GSIFCON电阻率保持很好的稳定性。
2.对GSIFCON板进行了交流升温实验,根据实验测得数据计算出电阻及电阻率。实验表明,在100W/m~2-300W/m~2的功率下板表面温度每小时可以升温6℃左右,说明了GSIFCON有着很好的电热效果。同时理论分析了PTC(正温度系数)效应和NTC(负温度系数)效应对GSIFCON板在升温过程的影响。
3.用GSIFCON板进行了两次融雪实验,取得了较好的融雪效果,表明GSIFCON是一种很好的电热材料,可满足冬季融雪要求。
4.根据传热学理论,确定了融雪模型传热边界条件;通过计算确定了GSIFCON材料相关参数。
5.在以上工作的基础上,建立了融雪有限元模型,通过数值模拟计算得出了融雪过程中的温度场分布,并与实际实验结果进行了对比分析。
Ice and snow in winter make airport pavement,road and bridge can't flow freely,which are of much impact on production and living of people.There were various defects existing in conventional methods to deicing and snow-melting.The method of conductive concrete is new ,environmental and efficient. GSIFCON is one kind of cement based composites, which is diphase conductive concrete composed of cement mortar, steel fibre,graphite, the rust inhibit and so on.This paper studies resistance stabilization of GSIFCON slab,electroheat,outdoors snow melting in winter based on previous research.And finite element model is founded to simulate snow melting with heat transfer theory and parameter of material.The contents of this paper mainly include the several aspects:
1.After a series of electrify experiments on GSIFCON slab with various power, the rules of resistance variation are found on various condition of temperature.At the same time it is concluded that resistivity of GSIFCON remain unchanged before and after snow melting based on research of experiments.
2.Resistance and resistivity are worked out with data measured by experiments,which used alternating current for temperature rising. Experiments showed that surface temperature of slab can rise up to 6℃per hour under the power which ranges from 100 W/m~2 to 300 W/m~2.It indicates that GSIFCON is of perfect electrothermal effect. At the same time it was made sure how PTC (the positive temperature coefficient) effect and NTC (the negative temperature coefficient) effect affect GSIFCON during the process of temperature rising by theoretical analysis.
3. Experiments of snow melting were carried out twice by GSIFCON slab,and snow was melt fine. It indicates that GSIFCON is a kind of fine electrothermal material.It can meet the requirement of snow melting in winter.
4.Heat transfer boundary condition of snow melting model was made certain by heat transfer theory. Parameter of GSIFCON was also worked out.
5.Finite model of snow melting is founded based on previous research.The distributing of temperature field was worked out by numerical simulation,and comparison was made with practical experiment of snow melting.
1.通过对GSIFCON板在不同功率下多次通电实验,得出了GSIFCON在不同温度条件下的电阻变化规律;同时实验研究发现融雪实验前后,GSIFCON电阻率保持很好的稳定性。
2.对GSIFCON板进行了交流升温实验,根据实验测得数据计算出电阻及电阻率。实验表明,在100W/m~2-300W/m~2的功率下板表面温度每小时可以升温6℃左右,说明了GSIFCON有着很好的电热效果。同时理论分析了PTC(正温度系数)效应和NTC(负温度系数)效应对GSIFCON板在升温过程的影响。
3.用GSIFCON板进行了两次融雪实验,取得了较好的融雪效果,表明GSIFCON是一种很好的电热材料,可满足冬季融雪要求。
4.根据传热学理论,确定了融雪模型传热边界条件;通过计算确定了GSIFCON材料相关参数。
5.在以上工作的基础上,建立了融雪有限元模型,通过数值模拟计算得出了融雪过程中的温度场分布,并与实际实验结果进行了对比分析。
Ice and snow in winter make airport pavement,road and bridge can't flow freely,which are of much impact on production and living of people.There were various defects existing in conventional methods to deicing and snow-melting.The method of conductive concrete is new ,environmental and efficient. GSIFCON is one kind of cement based composites, which is diphase conductive concrete composed of cement mortar, steel fibre,graphite, the rust inhibit and so on.This paper studies resistance stabilization of GSIFCON slab,electroheat,outdoors snow melting in winter based on previous research.And finite element model is founded to simulate snow melting with heat transfer theory and parameter of material.The contents of this paper mainly include the several aspects:
1.After a series of electrify experiments on GSIFCON slab with various power, the rules of resistance variation are found on various condition of temperature.At the same time it is concluded that resistivity of GSIFCON remain unchanged before and after snow melting based on research of experiments.
2.Resistance and resistivity are worked out with data measured by experiments,which used alternating current for temperature rising. Experiments showed that surface temperature of slab can rise up to 6℃per hour under the power which ranges from 100 W/m~2 to 300 W/m~2.It indicates that GSIFCON is of perfect electrothermal effect. At the same time it was made sure how PTC (the positive temperature coefficient) effect and NTC (the negative temperature coefficient) effect affect GSIFCON during the process of temperature rising by theoretical analysis.
3. Experiments of snow melting were carried out twice by GSIFCON slab,and snow was melt fine. It indicates that GSIFCON is a kind of fine electrothermal material.It can meet the requirement of snow melting in winter.
4.Heat transfer boundary condition of snow melting model was made certain by heat transfer theory. Parameter of GSIFCON was also worked out.
5.Finite model of snow melting is founded based on previous research.The distributing of temperature field was worked out by numerical simulation,and comparison was made with practical experiment of snow melting.
引文
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