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（1 中國(guó)石油大學(xué)（華東）儲(chǔ)運(yùn)與建筑工程學(xué)院，青島 266580； 2 中建八局一公司， 濟(jì)南 250100）

［摘要］為防止膨脹混凝土結(jié)構(gòu)在溫度及混凝土收縮應(yīng)力作用下產(chǎn)生裂縫，需掌握膨脹混凝土早期內(nèi)部應(yīng)變的變化規(guī)律。通過(guò)對(duì)實(shí)際工程膨脹混凝土后澆帶進(jìn)行現(xiàn)場(chǎng)監(jiān)測(cè)，研究了不同位置測(cè)點(diǎn)的溫度及膨脹劑添加對(duì)樓板應(yīng)變的影響。測(cè)試結(jié)果表明，在超長(zhǎng)結(jié)構(gòu)的樓板內(nèi)中添加一定比例的UEA膨脹劑，能有效減小結(jié)構(gòu)因材料收縮及溫度作用等因素引起的變形，防止混凝土結(jié)構(gòu)開(kāi)裂；對(duì)膨脹混凝土結(jié)構(gòu)的早期應(yīng)變實(shí)時(shí)監(jiān)測(cè)的方法，可及時(shí)調(diào)整養(yǎng)護(hù)方案，調(diào)節(jié)混凝土內(nèi)部應(yīng)變變化，達(dá)到控制混凝土裂縫產(chǎn)生的目的。

［關(guān)鍵詞］溫度應(yīng)力； 膨脹混凝土； 超長(zhǎng)結(jié)構(gòu)； 現(xiàn)場(chǎng)監(jiān)測(cè)； 裂縫

中圖分類(lèi)號(hào)：TU375， TU317-3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

*山東省優(yōu)秀中青年科學(xué)家科研獎(jiǎng)勵(lì)基金（BS2014SF017），國(guó)家自然科學(xué)基金（51678544），中建八局科研開(kāi)發(fā)立項(xiàng)項(xiàng)目，中央高?；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)資金資助（15CX02055A）。

作者簡(jiǎn)介：黃思凝，博士，講師，碩士生導(dǎo)師，Email:qtthsnxf@163.com。