（1 中国石油大学（华东）储运与建筑工程学院，青岛 266580； 2 中建八局一公司， 济南 250100）

［摘要］为防止膨胀混凝土结构在温度及混凝土收缩应力作用下产生裂缝，需掌握膨胀混凝土早期内部应变的变化规律。通过对实际工程膨胀混凝土后浇带进行现场监测，研究了不同位置测点的温度及膨胀剂添加对楼板应变的影响。测试结果表明，在超长结构的楼板内中添加一定比例的UEA膨胀剂，能有效减小结构因材料收缩及温度作用等因素引起的变形，防止混凝土结构开裂；对膨胀混凝土结构的早期应变实时监测的方法，可及时调整养护方案，调节混凝土内部应变变化，达到控制混凝土裂缝产生的目的。

［关键词］温度应力； 膨胀混凝土； 超长结构； 现场监测； 裂缝

中图分类号：TU375， TU317-3文献标识码：A文章编号：1002-848X(2017)04-0039-05

Site monitoring and result analysis of early strain of expansive concrete

Huang Sining1， Zhan Yongliang1， Zhang Yanmei1， Huang Hongxi2， Cheng Fei2， Bao Yan2

(1 College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China; 

2 The First Construction of China Construction Eighth Engineering Division, Jinan 250100, China)

Abstract:In order to prevent the crack in expansive concrete structure under the action of temperature and concrete shrinkage stress, it is necessary to know the change rule of the internal strain of expansive concrete at early age. The effects of the temperature of different measuring points and the addition of expansive agent on the strain of the concrete slab were studied by on site monitoring on expansive concrete post-pouring strip in practical engineering. The test results show that adding a certain proportion of UEA expansion agent in the super-long structure floor can effectively reduce the structural deformation caused by material shrinkage and temperature effects and other factors, to prevent the crack of concrete structure. Method of real time monitoring on early strain of expansive concrete structure can adjust the maintenance plan in time and adjust the internal strain changes of concrete to achieve the purpose of controlling concrete cracks.

Keywords:temperature stress; expansive concrete; super-long structure; site monitoring; crack

*山东省优秀中青年科学家科研奖励基金（BS2014SF017），国家自然科学基金（51678544），中建八局科研开发立项项目，中央高校基本科研业务费专项资金资助（15CX02055A）。

作者简介：黄思凝，博士，讲师，硕士生导师，Email:qtthsnxf@163.com。