为探究导电沥青混合料中碳纤维的分散性,采用响应曲面法研究碳纤维含量、搅拌时间、分散剂质量浓度对沥青混合料中碳纤维分布系数的影响,并通过扫描电子显微镜、X射线衍射仪、低温升热方法对最佳工艺条件下制备的导电沥青混合料中碳纤维的分布进行了表征。结果表明:碳纤维质量分数为0.31%、搅拌时间为6.32min、分散剂质量浓度为3.94g/L时,导电沥青混合料中碳纤维分散效果最佳,且沥青混合料同组试块电阻率差异最小,碳纤维分布系数由0.49增加到0.87,同组试块在低温环境中的升温速率趋向一致。采用响应曲面法建立的模型可靠性高,为改善导电沥青混合料电热性提供了研究基础。
In order to investigate the dispersion of carbon fibers in conductive asphalt mixtures,the response surface method was used to study the effects of carbon fiber content,mixing time,and dispersant mass concentration on the distribution coefficients of carbon fibers in the asphalt mixtures,and the distribution of carbon fibers in the conductive asphalt mixtures prepared under the optimal process conditions was characterized by scanning electron microscope,X-ray diffractometer,and low-temperature heat-up method.The results showed that the carbon fiber dispersion in the conductive asphalt mixture was best when the mass fraction of carbon fiber was 0.31%,the mixing time was 6.32min,and the dispersant mass concentration was 3.94g/L.The difference in electrical resistivity of asphalt mixture in the same group of specimens was the smallest,the distribution coefficient of the carbon fibers increased from 0.49 to 0.87,and the heating rate of the same group of specimens in the low-temperature environment tended to be the same.The model established by the response surface method was highly reliable and provided a research basis for improving the electrothermal properties of conductive asphalt mixtures.
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基金资助
广西科技基地和人才专项(桂科AD-19110085)
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