依托深圳市笋岗路的沥青路面热再生工程,测定了不同新、旧沥青掺配比例下的再生沥青粘度,建立并验证了再生沥青的复合粘温曲线;通过拌和模拟试验测定不同工况下再生沥青混合料的最终出料温度,分析得出废旧沥青混合料(RAP)预热及不预热2种工况下的热量传递系数,进而建立并验证了基于热传导的新集料加热温度计算式。结果表明:再生沥青的复合粘温曲线能计算确定任意RAP掺配率的再生混合料的最佳拌和温度,并具有计算简便、试验量小的优点;拌和过程中的热量传递系数与RAP的掺配率及含水量有关,随着掺配率的增大而增大,而随着含水量的增大而减小;基于热传导的新集料加热温度计算式能方便、快速、准确地确定新集料的加热温度,并具有很高的可靠性。
Abstract
Based on hot-recycled asphalt pavement at Sungang Road of Shenzhen, the viscosities of recycled asphalt reconciled at different proportions between new asphalt and recycled asphalt were tested, and the composite curve of viscosity-temperature of recycled asphalt was established and verified by laboratory tests. The final discharging temperature of recycled asphalt mixture was tested through the mixing simulation test under different working conditions. On the basis of it, the heat transfer coefficients under the two situations of non-preheating and preheating recycled asphalt pavement (RAP) were analyzed and the calculation formula of heating temperature of new aggregates based on thermal conductivity was established and verified. The results show that the optimal mixing temperature of recycled asphalt mixture with different added ratios of RAP can be calculated and determined by the composite curve of viscosity-temperature, which has the advantages of simple calculation and small test amount. The heat transfer coefficient in the mixing process relates to added ratio of RAP and water content in RAP, and it increases with RAP ratio and decreases with water content. The heating temperature of new aggregates is determined conveniently, rapidly, and accurately by the calculation formula of heating temperature of new aggregates based on thermal conductivity and the formula has high reliability.
关键词
道路工程 /
热再生混合料 /
拌和模拟试验 /
拌和温度 /
复合粘温曲线 /
热传导
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Key words
road engineering /
hot recycled mixture /
mixing simulation test /
mixing temperature /
composite curve of viscosity-temperature /
thermal conductivity
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中图分类号：
U414.1
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参考文献
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脚注
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基金
深圳市循环经济示范项目(COBO080829273F01)
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