龙湖公路隧道混凝土早期收缩性能研究

发布时间：2018-05-14 01:41

本文选题：隧道 + 混凝土　；参考：《混凝土》2014年06期

【摘要】：龙湖公路隧道是郑东新区的重要交通枢纽,建成通车后,将在郑州市交通体系中发挥至关重要的作用。采用国内先进的非接触法混凝土收缩变形测定仪,开展了试验室和施工现场混凝土收缩试验,深入研究了膨胀剂掺量、养护条件对混凝土早期收缩性能的影响。结果表明:随着膨胀剂掺量的增加,混凝土早期收缩率减小;随着养护湿度的降低,混凝土收缩率增大;膨胀剂掺量为6%和8%时,混凝土28d抗拉强度基本相同;膨胀剂掺量达到10%时,混凝土28d抗拉强度明显降低。随着养护相对湿度的降低,相同膨胀剂掺量的混凝土28d抗拉强度亦降低。混凝土收缩率在混凝土浇筑成型后的12 h内增长极为显著,之后混凝土收缩率趋于平稳。
[Abstract]:Longhu Highway Tunnel is an important transportation hub in Zheng Dong New area. When completed and opened to traffic, Longhu Highway Tunnel will play an important role in the traffic system of Zhengzhou City. The shrinkage tests of concrete in laboratory and construction site were carried out by using the advanced non-contact concrete shrinkage deformation tester in China. The effects of the amount of expansive agent and curing conditions on the early shrinkage properties of concrete were studied in depth. The results show that the early shrinkage of concrete decreases with the increase of the amount of expansive agent, the shrinkage rate of concrete increases with the decrease of curing humidity, the tensile strength of concrete at 28 days is basically the same when the content of expansive agent is 6% and 8%. When the amount of expansive agent reaches 10, the tensile strength of concrete decreases obviously at 28 days. With the decrease of curing relative humidity, the tensile strength of concrete with the same amount of expansive agent decreased for 28 days. The shrinkage rate of concrete increases remarkably within 12 hours after pouring, and then the shrinkage rate of concrete tends to be stable.
【作者单位】：郑州大学土木工程学院;河南东龙控股有限公司;
【基金】：河南省重点科技攻关项目(132102310277) 河南省博士后科研资助项目(2012010)
【分类号】：U454

【参考文献】