多孔水泥混凝土路面温度变化规律与温度场分析

发布时间：2018-01-07 10:08

本文关键词：多孔水泥混凝土路面温度变化规律与温度场分析　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：多孔水泥混凝土孔隙率通常在15%~25%之间,具有普通水泥混凝土所没有的透水透气性能。目前的研究大多集中在其物理力学性质,开展多孔水泥混凝土路面温度变化规律和温度场研究,对深入了解其使用性能具有较强的理论意义和实际应用价值。本文通过对多孔水泥混凝土路面温度变化规律、传热机理、蓄热能力以及温度应力的研究,为多孔水泥混凝土路面结构的设计和推广应用提供参考。为了避免外界环境的复杂变化对路面结构温度变化规律的影响,本文通过对室外和室内模拟条件下分别对普通和多孔水泥混凝土路面温度变化规律进行对比试验研究。室内试验研究时建立了路面材料吸热放热特性试验装置,分别探究了有风和无风条件下的路面结构温度变化规律。最后,在试验的基础上分别对普通和多孔水泥混凝土路面传热机理、蓄热能力以及温度应力进行了对比分析。研究发现,多孔路面路表温度变化幅度大于普通路面,且两者均远大于气温变化幅度。多孔水泥混凝土路面表面粗糙具有较大连通孔隙,并且比热容较小是导致多孔路面比普通路面表面升温快降温也快的主要原因。无风条件下,温度在试件板块中部以上分布呈非线性更加明显,试件中下部随深度增加趋于线性。无风时降温过程中试件内部温度随孔隙率的增大而增大,孔隙越大粗集料周围气体越多,热气流不流动,对粗集料起到阻热的作用。在风速为4m/s作用下,试件表面温度均降低,但多孔试件表面降温幅度更大。多孔水泥混凝土路面蓄热系数较小是缓解城市局部热岛效应的机理所在。在温度应力方面,随着板长的增长,试件板块的温度应力均增大。但是板长一定时,普通路面内部温度翘曲应力远大于多孔路面。最后,结合规范和温度应力的计算结果提出了多孔路面的横向接缝间距应适当大于普通路面接缝间距的建议。
[Abstract]:The porosity of porous cement concrete is usually between 15%~25%, with ordinary cement concrete without penetration. The current research is mainly concentrated in the physical and mechanical properties of porous cement concrete pavement, temperature variation and temperature field research, in-depth understanding of the theoretical significance and practical value to its performance. The heat transfer mechanism the porous cement concrete pavement temperature variation, research on heat storage capacity and temperature stress, provide a reference for the design and application of porous cement concrete pavement. In order to avoid the influence of complex changes in the external environment on the temperature variation of the pavement structure, based on the outdoor and indoor simulation conditions were studied by comparison tests for ordinary porous cement concrete pavement and temperature variation. Laboratory test on the established road The test device of endothermic and exothermic characteristics of surface materials, the temperature variation of pavement structure under wind and no wind is explored respectively. Finally, on the basis of the experiment respectively for ordinary and heat transfer mechanism of porous cement concrete pavement, stress and temperature of heat storage capacity were analyzed. The study found that the porous pavement surface temperature variation more than ordinary roads, and both are far greater than the temperature changes. The porous cement concrete pavement surface roughness is Dalian through pores, and smaller heat capacity is the result of porous pavement than ordinary pavement surface temperature quickly cooling the main reason quickly. Under the conditions of no wind, the temperature in specimen plate above middle distribution is nonlinear is more obvious, try in the lower with increasing depth approximately linear. When there is no cooling process inside the specimen temperature increases with the increase of porosity, pore more coarse aggregate around gas Body more, hot air does not flow to the thermal resistance effect on coarse aggregate. The wind speed is 4m/s under the effect of specimen surface temperature decreased, but the porous surface of the specimen temperature range is larger. Porous cement concrete pavement is smaller in the heat storage coefficient mechanism of city heat island. Local relief in temperature force, with plate length, plate specimen temperature stress increased. But in length, the internal temperature of the normal pavement warping stress is much greater than the porous pavement. Finally, combined with the specification and calculation of temperature stress results of the porous pavement transverse joint spacing should be the common pavement joint spacing is larger than the appropriate advice.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.216

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