共查询到20条相似文献,搜索用时 15 毫秒
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Quantao Liu Álvaro García Erik Schlangen Martin van de Ven 《Construction and Building Materials》2011,25(9):3746-3752
The objective of this paper is to detect the healing effect of asphalt mastic and porous asphalt concrete caused by induction heating. It was found that the broken mastic beams could be healed many times by induction heating. Moreover, the stiffness of porous asphalt concrete recovered more and faster when induction heating was applied to the samples. It was also found that fatigue life of porous asphalt concrete was significantly extended by induction heating. Based on these findings, it was concluded that the self healing rate of asphalt mastic and porous asphalt concrete can be increased by induction heating. 相似文献
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石墨导电混凝土的研究 总被引:10,自引:1,他引:9
本文探讨了石墨导电混凝土在养护龄期28d内电阻的变化,分析了不同数量级的电阻在用交直流电和万用电表测试时的差别。研究了电阻率和28d抗压强度随石墨含量变化情况。确定了石墨的渗滤阈值。 相似文献
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不锈钢纤维石墨导电混凝土的研究 总被引:1,自引:1,他引:1
介绍了导电混凝土的导电机理;用外贴不锈钢纤维网为电极。比较了石墨、钢纤维不同掺量对混凝土强度和导电率的影响,比较了导电混凝土在不同养护龄期内电导率的变化和采用交流电和直流电测试电导率的差别,并分析了导电混凝土块在交流电源下的升温效果。结果表明:用不锈钢纤维网作电极,能满足要求;交流电所测试方法能真实反映混凝土的电导率;混凝土的导电率在龄期28d后趋于稳定;综合电导率和强度两个因素,钢纤维和石墨最佳质量分数为2%和15%,28d交流电导率为:2.19×10-2Ω-.1m-1,抗压强度为:23.4MPa;导电混凝土在通电后,电能可转变为热能。 相似文献
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用于公路桥梁融雪除冰的导电混凝土研究现状 总被引:2,自引:0,他引:2
对目前用于公路桥梁融雪除冰的导电混凝土的研究现状进行了综述,从应用材料、融雪化冰机理、外部环境的影响等方面进行了分析,提出了实际应用中还需解决的问题,为今后的进一步研究奠定了基础。 相似文献
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The piezoresistivity effect of conductive asphalt concrete (CAC) and mechanism of the effect are analyzed in this paper. Experimental results show that the applied stress or strain could have a great influence on the resistance of conductive asphalt concrete, and this influence is called the piezoresistivity effect. The piezoresistivity effect reflects the microstructure change of asphalt concrete. The piezoresistivity mechanism of CAC is studied through the research on the conductive substance and conductive mechanism of carbon fiber and graphite modified asphalt concrete. A series-wound model is built to interpret the piezoresistivity effect. This model explains why CAC has a piezoresistivity effect. The number of electronic carriers in the interior structure influences the electrical property of CAC and this number would change in different loading conditions. Therefore, the piezoresistivity effect of CAC can be analyzed by electronic carriers’ number and the relationship between resistivity and number of electronic carriers is the inverse ratio. 相似文献
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结合工程实际,从技术角度、施工工艺角度以及经济角度分析环氧沥青混凝土和SMA沥青混凝土的优缺点,得出环氧沥青混凝土较SMA沥青混凝土在钢桥面铺装层上的应用效果良好的结论。 相似文献
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研究了炭黑碳纤维复相导电混凝土的导电性能,分析了导电混凝土的电阻率变化,为实际应用于道路融雪化冰提供理论依据与试验依据。利用纳米导电炭黑和碳纤维作为导电相来改善混凝土的导电性能,进行炭黑碳纤维复相导电混凝土的导电性能试验,分析环境温度、干湿度和外加电压对炭黑碳纤维导电混凝土电阻率的影响。导电混凝土的电阻率受温度、湿度和外加电压的影响,当环境条件发生变化时,导电混凝土的导电性能也会发生变化。炭黑碳纤维复相导电混凝土的电阻率随着温度的升高出现一定程度的减小;干燥状态下的电阻率高于潮湿状态下的电阻率;电阻率随着外加电压的增大有一定程度的减小,当电压达到一定数值时,电阻率趋于稳定。 相似文献
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Porous asphalt concrete due to its open structure is exposed to water and therefore susceptible to water damage. Effect of water, temperature and frequency on mechanical properties of porous asphalt concrete was investigated. An innovative test method developed in Switzerland is used to mechanically test 150 mm diameter cylindrical cores from eight materials in dry state and while being submerged under water. Although the conventional indirect tensile strength ratio delivers useful data about the water sensitivity of porous asphalt specimen, the coaxial shear test provides vital information about the development of fatigue damage in the material. Application of coaxial shear test (CAST) for a twin lay porous asphalt as well as conventional porous asphalt shows a reduction in complex modulus due to fatigue loading after each thermal cycle and due to detrimental effects of water submersion. Moisture susceptibility results using CAST reflected the field inspections of surface degradation. In addition, investigation of the microstructure has given insight into the mechanical behavior of selected materials. 相似文献
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从路用性能、钢桥面铺装结构、施工工艺等方面入手,对比分析了浇筑式沥青混凝土与环氧沥青混凝土的性能特点和施工特点及经济性,以指导实际施工中根据不同情况及施工要求合理选用相应的沥青混凝土。 相似文献
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微波加热是沥青混凝土路面的一种新型绿色养护技术,但目前微波吸收效率低下与沥青混凝土导热能力差是阻碍其推广应用的关键.基于阻抗匹配理论,考虑到掺加单一微波增强剂的局限性,提出一种改进的二元电磁复合型微波增强剂;将SiC和Fe3O4二元复合作为微波增强剂,采用矢量网络分析仪对微波增强剂样品的电磁参数进行测量.考虑到实验室缺... 相似文献