水泥混凝土路面板早龄期湿度场数值模拟研究

发布时间：2018-06-04 02:31

本文选题：水泥混凝土路面 + 早龄期　；参考：《工程力学》2014年04期

【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]:Based on the moisture diffusion equation of Fick's second law, the effect of self-drying on the humidity of the plate is considered by using the finite difference method, focusing on the panel temperature change, the ability of water absorption and water supply of the base, and the self-drying. In this paper, numerical simulation and characteristic study of moisture field of cement concrete pavement slab at early age under site construction conditions are carried out, and the results are compared with indoor test, field monitoring test of four seasons and similar research results abroad. The results show that the algorithm, model and parameters can be used to simulate the field panel humidity field, and the coupling effect of temperature and humidity in the panel should be considered in the numerical simulation, and the base layer moisture exchange boundary can be used in the numerical simulation. The moisture boundary of the base can make the moisture calculation value of the panel significantly higher. The humidity of cement concrete pavement is more easily affected by the surrounding environment parameters, the construction time and the maintenance mode under the field construction condition, but the change of the material parameter has no significant effect on the humidity of the concrete pavement. It is suggested that the upper and lower boundary conditions and parameters of the slab should be further refined and that the pavement construction should avoid the hot season, the high temperature period and the excessive prehumidity of the base course.
【作者单位】：福州大学土木工程学院;
【基金】：国家自然科学基金项目(50908056) 福建省自然科学基金项目(2009J01249)
【分类号】：U416.216

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