高原地区纤维混杂微膨胀混凝土大尺寸面板  

Big Dimensional Pavement Slabs with Hybrid Fiber Reinforced Micro Expansion Concrete in Plateau

作　　者：黄凯健[1,2] 邓敏[2] 何大贵[3] 王军[4] 莫立武[2] 

机构地区：[1]南京林业大学土木工程学院,江苏南京210037 [2]南京工业大学材料化学工程国家重点实验室,江苏南京210009 [3]成都军区空军后勤部机营处,四川成都610041 [4]中国航空港建设第九工程总队,四川成都611431

出　　处：《建筑材料学报》2010年第4期474-477,共4页Journal of Building Materials

基　　金：国家重点基础研究发展计划(973计划)项目(2009CB623105);"十一五"国家科技支撑计划项目(2006BAF02A2506)

摘　　要：西藏某机场在使用近40a后其道面板接缝出现严重破损,减少了机场的服役寿命.为了降低道面接缝破损引起的耐久性问题,采用纤维混杂微膨胀混凝土技术,将道面板尺寸由4m×4m增大至4m×8m(大板),并通过在大板内部埋设混凝土应变计测量了其应变变化规律.结果表明:大尺寸面板早期未出现开裂,在其内部出现了不同程度的微膨胀效应;新型道面作用机理为氧化镁膨胀剂水化产生的膨胀能与纤维的物理约束共同作用,从而提高了混凝土自身抗变形能力.Serious deformations of joint seam on the pavement have been found in an airport located in Tibet.In order to reduce these corrosions at seams,hybrid fiber reinforced micro expansion concrete has been applied to the pavement slab to enlarge its dimension from 4 m×4 m to 4 m×8 m.Concrete strain gauges have been placed in slabs to analyze strain field in concrete.The results show that no cracks have been found in big dimension slabs at early age.Micro expansions have also been measured inside the concrete slabs which may be caused by the effect of hydration of magnesia expansion agent（MEA）.The stabilities of new pavements have been enhanced by restrains of fibers together with expansion of MEA.

关 键 词：道路工程 纤维混杂 微膨胀混凝土 大尺寸面板 

分 类 号：U416.2[交通运输工程—道路与铁道工程]