Effect of carbon fillers on electrical and road properties of conductive asphalt materials
Effect of carbon fillers on electrical and road properties of conductive asphalt materials
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DOI：
10.1016/j.conbuildmat.2014.06.059
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发表时间：
2014-10
影响因子：
7.4
通讯作者：
Xiaoming Liu;Weizheng Liu;Shaopeng Wu;Cui Wang
中科院分区：
文献类型：
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作者：
Xiaoming Liu;Weizheng Liu;Shaopeng Wu;Cui Wang
采用石墨、碳纤维等导电材料对沥青材料的电性能和路用性能进行了改性。通过动态机械分析（DMA）试验、车辙试验、马歇尔稳定性试验、劈裂试验和电性能表征试验研究了材料性能的变化。结果表明，当石墨含量小于30%时，沥青结合料的低温储能模量和低温损耗模量降低。当石墨含量为40%时，模量达到最大值。另外的石墨降低了沥青粘合剂的储能模量和损耗模量。随着石墨含量的增加，峰值相位角从低温向高温移动，这表明玻璃化转变温度增加。玻璃化转变温度可用于评价沥青结合料和沥青混合料的低温性能。在沥青混合料中掺入40%石墨和0.3%碳纤维后，沥青混合料的电阻从∞下降到835 Ω，马歇尔稳定度提高4%，劈裂强度提高18%，动稳定度提高78%。然而，过多的碳纤维或过少的碳纤维并没有增加路面强度。在间接拉伸试验中，复合材料电阻率的演化过程可分为4个阶段：可逆感应阶段、平衡阶段、稳定增长阶段和急剧增长阶段。这四个阶段分别对应了材料内部不同的结构，说明对导电沥青混合料进行损伤和裂缝自监测是可行的。
The electrical and road properties of asphalt materials were modified using different conductive materials, such as graphite and carbon fiber. The material property changes were studied using DMA (Dynamic Machine Analysis) testing, wheel track rutting testing, Marshall stability testing, splitting testing, and electrical property characterizing testing. The results showed decreases in the storage modulus and the loss modulus of the asphalt binders at low temperature when the graphite content was less than 30%. The modulus reached maximum values when the graphite content equaled 40%. Additional graphite reduced the storage modulus and loss modulus of the asphalt binders. With increased graphite content, the peak phase angle shifted from low to high temperature, which showed an increase in the glass transition temperature. The glass transition temperature can be used in the evaluation of the low temperature properties of the asphalt binder and the asphalt mixture. With the addition of 40% graphite and 0.3% carbon fiber by weight to the asphalt mixture, the resistance of the asphalt mixture decreased from ∞ to 835 Ω, the Marshall stability increased by 4%, the split strength increased by 18%, and the dynamic stability increased by 78%. However, excessive carbon fiber or too little carbon fiber did not increase pavement strength. In the indirect tensile testing, the evolution processes of the resistivity of the composites were found to have four periods: a reversible sensing period, a balance period, a steadily increasing period, and a sharply increasing period. The four periods correspond to different interior structures of the material, which show that damage and crack self-monitoring is feasible in conductive asphalt mixture.