摘要
纵向配筋是修筑CRCP的关键技术,也是制约其推广应用的主要问题。针对CRCP和CRC+AC复合式路面的结构特点和现有研究的不足,对现行规范中CRCP的纵向配筋方法进行了分析。运用传热学理论和有限元法,研究了CRC+AC复合式路面沥青混凝土面层的温度效应,计算和分析了沥青混凝土面层温度效应对CRC+AC复合式路面纵向配筋率的影响规律。研究结果表明:现行规范中横向裂缝平均间距和缝隙平均宽度的计算公式不够科学和合理,对温度效应考虑也不够全面,与实际不符;建议目前仍按2002版规范为依据进行纵向配筋设计;CRC+AC复合式路面沥青混凝土面层的厚度在不小于4cm时能起到隔热作用,并对纵向配筋率可以起到折减作用;CRC+AC复合式路面沥青混凝土面层厚度为10cm时,纵向配筋率可减小0.06%。研究成果对CRCP和CRC+AC复合式路面的合理设计和推广应用有重大意义,也可为公路水泥混凝土路面设计规范的重新修订提供重要参考。
Longitudinal reinforcement is the key technique for the construction of CRCP, however, an improper longitudinal reinforcement could limit the popularization and application of CRCP. This paper mainly focuses on the structure characteristics and the flaws of existing studies of CRCP and CRC＋ AC composite pavement, longitudinal reinforcement method in current specifications is analyzed, using heat transfer theory and finite element method, temperature effect of asphalt concrete layer is researched, the influence of temperature effect on longitudinal reinforcement ratio of CRC＋ AC composite pavement is calculated and analyzed. The results show that. the formulas Of the average spacing of transverse crack and the average gap width is not enough scientific and reasonable, the temperature effect is also not considered comprehensive, it is incompatible with the actual; it is recommended that the 02 specification as a basis be applied for longitudinal reinforcement design; it can play a role in thermal insulatio when the thickness of asphalt concrete layer is not less than 4era in CRC＋ AC composite pavement, and can play a role in reduction for longitudinal reinforcement ratio; the thickness of asphalt concrete layer is 10era, the longitudinal reinforcement ratio of CRC ＋ AC composite pavement can be reduced by about 0.06%. Consequently, the results of this paper are of great significance in the rational design and the popularization and application of CRCP and CRC＋AC composite pavement. Also, it can provide the fundamental basis for a revised version of ＂the specifications of cement concrete pavement design for highway＂.
出处
《公路》
北大核心
2013年第3期20-25,共6页
Highway
基金
国家自然科学基金项目
项目编号51178062
51038002
交通运输部应用基础研究项目
项目编号2011319825040
教育部博士点基金项目
项目编号20114316110001
