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为确定双层摊铺工艺下沥青混合料的有效碾压时间及碾压温度,建立了基于热传导理论的混合料温度散失有限元预估模型,并进行了实测验证;系统研究外界温度在0~40℃下的双层摊铺混合料温度散失规律,进而提出了不同外界温度下混合料的有效碾压时间段,最后通过试验路工程进行了验证。研究结果表明:由双层摊铺温度模型预估的混合料温度散失规律与实测温度散失趋势相近,模型具有较高的精度;当摊铺温度分别为150℃、170℃时,有效碾压时间分别为28~48min和22~37min,满足工程需求;试验路铺筑表明,采用双层摊铺温度散失模型预估的有效碾压时间进行施工,可以提高路面平整度,保证路面充分压实,确保道路的通行质量。
In order to determine the effective rolling time and rolling temperature of asphalt mixture under the double-layer paving process, a finite element prediction model of temperature loss of the mixture based on heat conduction theory was established and verified by experiments. 40 ℃ under the law of double-layer paving mixture temperature loss, and then put forward the different ambient temperature mixture effectively rolling time period, and finally through the pilot project was verified. The results show that the law of loss of temperature predicted by the double-layer paving temperature model is similar to that of the measured temperature, and the model has higher accuracy. When the paving temperature is 150 ℃ and 170 ℃ respectively, the effective rolling time Respectively, 28 ~ 48min and 22 ~ 37min, to meet the engineering needs; pavement test shows that the use of double paving temperature loss model estimated effective rolling time for construction, can improve pavement smoothness, to ensure full compaction of the road, Ensure the quality of the road.