环境荷载对混凝土路面板早龄期固化翘曲演化行为影响  

Effects of environmental loads on the evolution behavior of early age built-in curling of concrete pavement

作　　者：王丽娟[1] 孙增华[1] 胡昌斌[1] WANG Lijuan;SUN Zenghua;HU Changbin(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2021年第1期65-73,共9页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51978172,51808127)。

摘　　要：基于水泥混凝土路面板早龄期温度场和三维力学仿真程序,设计不同环境场下路面板早龄期温度场荷载工况,构造面板早龄期固化翘曲参数BIC(t),深入揭示施工环境荷载场对面板早龄期变形与固化翘曲形成演化影响.研究发现,面板终凝固化温度差对固化翘曲影响在早期将产生明显衰减,而早龄期温度场加载历程的影响效应更为显著.在早龄期高徐变、低模量和结构约束的联合作用下,面板早龄期更倾向于固化负温度差,加剧面板的板角翘曲.高原地区拉萨由于路面板早龄期阶段温度差较大,BIC 28也较大,量级可达-6.9℃;同一地区升温月份上午施工面板BIC 28量级较大.对不同地区BIC 28取值建议-1.9~-6.9℃,叠加考虑服役期湿度干缩影响后EBITD 28取值建议-10.8~-16.7℃.Based on the prediction program of early-age temperature field and the 3D mechanical simulation program of cement concrete pavement,the early age temperature loading conditions of pavement under different environment were designed,and the parameter BIC(t)of early-age built-in curling was constructed to reveal the influence of the construction environment on early-age deformation character and the formation and evolution of early-age built-in curling.The results showed that the effect of built-in temperature difference at the final setting on the formation of built-in curling was obviously attenuated in early age,and the effect of loading process of temperature field in early age was more significant.Under the combined action of high creep,low modulus and structural constraints in early age,the negative temperature difference tended to be built-in and aggravates the curling of slab corner.Besides,in plateau area(Lhasa),the temperature difference in pavement early age was large,causing the larger BIC 28 on the 28th day,with the magnitude of-6.9℃.And the magnitude of BIC 28 of pavement constructed in the morning of heating month was relatively larger in the same area.The recommended value of BIC 28 in different areas was from-1.9 to-6.9℃.While considering the influence of humidity shrinkage in service period,the recommended value of EBITD 28 was from-10.8 to-16.7℃.

关 键 词：水泥混凝土路面 早龄期 固化翘曲 环境荷载 温度场 

分 类 号：U416[交通运输工程—道路与铁道工程]