- 摘 要
-
(1 安徽理工大學土木建筑工程學院，淮南 232001； 2 西安建筑科技大學土木工程學院，西安 710055；3 中國化學工程第十三建設公司第一分公司，滄州 061000)
［摘要］通過對某佛塔基礎底板大體積混凝土施工難點進行分析，對澆筑前混凝土中的溫度峰值、溫度應力進行了模擬計算。深入研究了三種裂縫控制新技術，結果表明：加入相變材料的大體積混凝土的升、降溫速率明顯變得緩慢，在一定程度上減少了混凝土溫度裂縫產(chǎn)生的概率；設置滑動支座改善約束條件，對防止大體積混凝土的開裂起到了明顯的作用；充分利用混凝土自身的徐變、應力松馳特性，以時間控制裂縫，是一種消耗資源最少的方法。
［關鍵詞］大體積混凝土;模擬計算;相變材料;滑動支座;松弛
Research on new technology for controlling crack in the foundationbase slab of mass concrete in certain stupa
Jiang Xiping1,2，Wang Sheliang2，Duan Shuxin3, Liu Wei2，Xing Yong2(1 School of Civil Engineering and Architecture, Anhui University of Science and Technology，Huainan 232001，China；2 School of Civil Engineering, Xi’an University of Architecture and Technology，Xi’an 710055，China；3 The First Sub-company of the No.13 Construction Company China National Chemical Engineering，Cangzhou 061000，China)
Abstract:Major construction difficulties are analyzed，the maximum temperature value and temperature stress in the foundation base slab of mass concrete before casting are simulated. Three new techniques for controlling crack are researched, which proved that PCM (phase change materials) can not only lower probability of temperature crack in some degree but also can delay its speed of temperature rise or temperature reduction of mass concrete，and we will acquire a obvious effect on Preventing mass concrete from Cracking if we set sliding support，we may control cracking of mass concrete by enough time if we make use of creep and relaxation of mass concrete itself，moreover it is a good way to consume the lowest resource.
Keywords:mass concrete; simulate calculation; PCM; sliding support; relaxation
*國家自然科學基金項目(59878044);安徽理工大學引進人才科研啟動基金。
作者簡介:江昔平,副教授,博士研究生,Email: jiangxp-xh@163.com。
參考文獻
［1］王鐵夢.工程結構裂縫控制［M］.北京：中國建筑工業(yè)出版社,2004.
［2］史巍,張雄.相變控溫大體積混凝土抗裂性能研究［J］.新型建筑材料,2008(5).
［3］羅國強,羅剛.混凝土與砌體結構裂縫控制技術［M］.北京：中國建材工業(yè)出版社,2006.
［4］燕輝,樓文娟.超大面積地下室頂板溫度應力研究［J］.科技通報,2004,20(2)：127-132.
［5］ACI363-2R Guide to Quality Control and Testing of High-strength Concrete［S］.
［6］江昔平,王社良.基于有限差分法的某筏板基礎溫度場的計算與溫控措施［J］.工業(yè)建筑,2008,38(4),63-67.
［7］JOHN GAJDA,MARTHA VANGEEM. Controlling temperatures in mass concrete［J］. Concrete International, 2002(1):59-62.
