摘要
首先根据现场监测试验研究分析了水泥混凝土路面早龄期温度场特征;然后综合国内外研究和我国水泥路面施工技术特点,研究选取确定水泥水化放热、环境变化、热交换这3个方面的模型和参数,采用有限差分法编制了水泥混凝土路面早龄期温度场数值模拟程序;并通过现场足尺路面板早龄期与长期温度场监测试验,室内小板试验调试验证了模型和程序;基于程序的参数敏感性分析表明,路面材料结构参数、外部环境气象参数,养护方式、铺筑时间、混凝土摊铺温度以及受混凝土早龄期显著影响的路面辐射吸收率、面板导热系数等显著影响路面早龄期温度场。建议进一步揭示水化放热模型和掺合料组分对水化时间、形态参数的影响特性,提高数值模拟精度。
Based on field tests,the early-age temperature of cement concrete pavement was analysed firstly.Then combining existing studies and construction technique,models and parameters of hydration heat evolution,environment and heat exchange were selected.Using heat transfer theory and the finite difference method,a numerical simulation program of early-age temperature for cement concrete pavements is developed.The program can consider cement concrete material characteristics and construction technology in China.Then spot meteorological monitoring,temperature survey tests of early-age and long-term for full-size pavements and small slab experiments in the lab testified the program’s applicability respectively.The parameter sensibility analyzed by the program shows that primary factors affecting early-age temperature of pavements are material structure parameters,ambient parameters,maintaining methods,paving time,concrete placement temperature,solar absorptivity and thermal conductivity which affect obviously by early age.It is recommended to study and modify the concrete hydration heat evolution model as well as the influence of admixture component on hydration time parameter and hydration slope parameter.
出处
《工程力学》
EI
CSCD
北大核心
2013年第4期175-183,共9页
Engineering Mechanics
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)
关键词
水泥混凝土路面
早龄期
水化反应
温度场
数值模拟
cement concrete pavements
early-age
hydration reaction
temperature field
numerical simulation
