热拌沥青混合料施工过程中温度场变化及质量控制
发布时间：2018-11-18 08:19
【摘要】：本文以贵州“遵义—赤水”高速公路某项目部承当的沥青路面建设为对象，研究热沥青混合料施工阶段温度场变化规律，探讨基于温度场变化的沥青路面施工过程的质量控制。主要研究内容如下： 研究沥青混合料原材料、沥青的控制及沥青混合料级配设计，采用马歇尔实验的方法设计并优化了沥青混合料的级配，得出在油石比4.6%时沥青混合料具有较好特性；分析了沥青混合料搅拌过程中的质量控制策略，结果表明，影响出厂沥青混合料质量的有搅拌过程中的级配控制及搅拌中的温度控制，必须严格控制这些因素，才能得到高质量的热沥青混合料。 对沥青混合料施工环节中的温度场变化进行了研究，研究表明热沥青混合料在180℃出站后，在运输阶段、摊铺阶段和压实阶段是温度场变化的重要阶段。运输阶段沥青在箱体中各个点的温度变化不均匀，在箱体偏下部温度最高；摊铺后的热沥青混合料在其上表面80cm空间形成一个温度保护屏蔽，在摊铺后15分钟内，温度降低能达到15℃，，；对压实阶段沿路面长度和铺层厚度方向的温度场变化进行仿真，结果表明两个方向都形成一个时域温度场，应依此确定路面压实工艺。 基于热沥青混合料在施工环节中每个阶段的温度场变化特点，分析了沥青混合料机械化施工中设备的特性，优化配置了施工的主要设备及辅助设备，建立了以温度为基础的施工工艺控制方法。 研究以温度变化为控制要素，在摊铺阶段、压实阶段的质量控制，结果表明，摊铺阶段的质量控制应该从振捣器和振动装置入手，结合实际温度调节摊铺机参数，能取得满意的预压实度；压实过程中压实温度是压实时间和压实遍数控制的重要依据，允许碾压时间决定于混合料出料温度、摊铺厚度和环境温度；而且摊铺和压实阶段温度控制不理想，同样会造成离析产生。
[Abstract]:Taking the construction of asphalt pavement in a project department of Zunyi-Chishui Expressway in Guizhou Province as the object, this paper studies the variation law of temperature field in the construction phase of hot asphalt mixture, and probes into the quality control of asphalt pavement construction process based on the change of temperature field. The main contents are as follows: the raw materials of asphalt mixture, the control of asphalt and the gradation design of asphalt mixture are studied, and the gradation of asphalt mixture is designed and optimized by Marshall experiment. It is concluded that asphalt mixture has better characteristics when the ratio of asphalt to stone is 4.6. The quality control strategy in the mixing process of asphalt mixture is analyzed. The results show that the gradation control in the mixing process and the temperature control in the mixing process, which affect the quality of the asphalt mixture, must be strictly controlled. In order to get high quality hot asphalt mixture. The change of temperature field in the construction of asphalt mixture is studied. The results show that the thermal asphalt mixture is an important stage of temperature field change in transportation stage, spreading stage and compaction stage after leaving the station at 180 鈩
本文编号：2339444
[Abstract]:Taking the construction of asphalt pavement in a project department of Zunyi-Chishui Expressway in Guizhou Province as the object, this paper studies the variation law of temperature field in the construction phase of hot asphalt mixture, and probes into the quality control of asphalt pavement construction process based on the change of temperature field. The main contents are as follows: the raw materials of asphalt mixture, the control of asphalt and the gradation design of asphalt mixture are studied, and the gradation of asphalt mixture is designed and optimized by Marshall experiment. It is concluded that asphalt mixture has better characteristics when the ratio of asphalt to stone is 4.6. The quality control strategy in the mixing process of asphalt mixture is analyzed. The results show that the gradation control in the mixing process and the temperature control in the mixing process, which affect the quality of the asphalt mixture, must be strictly controlled. In order to get high quality hot asphalt mixture. The change of temperature field in the construction of asphalt mixture is studied. The results show that the thermal asphalt mixture is an important stage of temperature field change in transportation stage, spreading stage and compaction stage after leaving the station at 180 鈩
本文编号：2339444
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