胡昌斌, 王丽娟, 吕恒. 水泥混凝土路面板早龄期湿度场数值模拟研究[J]. 工程力学, 2014, 31(4): 178-188,224. DOI: 10.6052/j.issn.1000-4750.2012.11.0874
引用本文: 胡昌斌, 王丽娟, 吕恒. 水泥混凝土路面板早龄期湿度场数值模拟研究[J]. 工程力学, 2014, 31(4): 178-188,224. DOI: 10.6052/j.issn.1000-4750.2012.11.0874
HU Chang-bin, WANG Li-juan, LÜ Heng. NUMERICAL MODELING OF CEMENT CONCRETE PAVEMENTS’ INTERNAL MOISTURE FIELDS AT EARLY AGES[J]. Engineering Mechanics, 2014, 31(4): 178-188,224. DOI: 10.6052/j.issn.1000-4750.2012.11.0874
Citation: HU Chang-bin, WANG Li-juan, LÜ Heng. NUMERICAL MODELING OF CEMENT CONCRETE PAVEMENTS’ INTERNAL MOISTURE FIELDS AT EARLY AGES[J]. Engineering Mechanics, 2014, 31(4): 178-188,224. DOI: 10.6052/j.issn.1000-4750.2012.11.0874

水泥混凝土路面板早龄期湿度场数值模拟研究

NUMERICAL MODELING OF CEMENT CONCRETE PAVEMENTS’ INTERNAL MOISTURE FIELDS AT EARLY AGES

  • 摘要: 基于Fick第二定律湿度扩散方程,采用有限差分方法,重点考虑面板温度变化、基层吸水及供水能力、自干燥对板内湿度的影响,开展了现场施工条件下水泥混凝土路面板早龄期湿度场数值模拟和性状特性研究,并与室内试验、四季不同的现场监测试验和国外类似研究结果进行了对比校验。研究表明采用的算法、模型和参数可较好模拟现场面板湿度场性状,数值模拟宜考虑面板内部温湿度耦合作用、采用基层湿度交换边界,基层绝湿边界可使面板湿度计算值显著偏高。现场施工条件下水泥混凝土路面湿度更易受到周围环境参数、施工铺筑时间和养护方式的显著影响,相比之下材料参数改变对面板湿度影响并不显著。建议进一步精细化研究板上下边界条件及参数,路面施工时尽量避免炎热季节,高温时段和基层过于预湿。

     

    Abstract: Relevant numerical simulation and characteristic analysis were conducted based on Fick’s second law of moisture transport, using the finite difference method, and considering the effects of slab temperature, water absorption base capacity and supply, and concrete self-desiccation on slab moisture. Then the numerical simulation program was verified by comparison with laboratory tests and field tests in different seasons and with similar foreign research. The research shows that the models and parameters in the paper can accurately simulate moisture pavement moisture characteristics. However, the coupled effect of concrete temperature and moisture and the moisture convection boundary conditions at the base should been considered in numerical simulation. Using a Neumann boundary with null moisture flux at the bottom of the slab can cause predicted values to be higher than actual values. Environmental parameters, paving time, and curing methods greatly affect early-age moisture of pavements. By contrast, the effect of material parameters is not obvious. It is recommended to study the top and bottom boundary conditions and parameters of the program in more detail, and pavement construction under hot seasons, high temperatures, or on an overly wet base should be avoided as possible.

     

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