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为研究碾压温度对沥青混合料压实特性的影响,采用数值方法建立了松铺和密实2种状态下沥青混合料碾压温度场的分析模型。研究了不同环境因素、摊铺层厚度以及初始温度下沥青混合料碾压温度随时间的变化规律。计算了沥青混合料的最短有效压实时间和最长有效压实时间,建立了有效压实时间的多元回归模型,并通过实体工程进行了验证。结果表明:温度随着时间的增加而不断降低,降温速率随着风速的降低,大气温度、太阳辐射热量或摊铺层厚度的增加而降低,而松铺沥青混合料的降温速度快于密实沥青混合料,其有效压实时间更短。经验证,有效压实时间计算模型合理可靠,可为今后工程实践提供参考依据。
In order to study the effect of rolling temperature on the compaction characteristics of asphalt mixture, numerical analysis method was established to analyze the rolling temperature field of asphalt mixture under the conditions of loose and compact. The variation of asphalt mixture temperature under different environmental factors, thickness of paving layer and initial temperature were studied. The shortest effective compaction time and the longest effective compaction time of asphalt mixture were calculated. The multiple regression model of effective compaction time was established and validated by physical engineering. The results show that the temperature decreases with the increase of time, and the cooling rate decreases with the decrease of wind speed, the increase of air temperature, the heat of solar radiation or the thickness of paving layer, while the cooling rate of Songpu asphalt mixture is faster than that of dense asphalt Mixture, the effective compaction time is shorter. Prove that effective compaction time calculation model is reasonable and reliable, which can provide reference for engineering practice in the future.