- 摘 要
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（1 洛陽理工學(xué)院土木工程系，洛陽 471023；2 中國科學(xué)院上海硅酸鹽研究所高性能陶瓷和超微結(jié)構(gòu)國家重點實驗室，上海 200050）
［摘要］使用埋設(shè)型KM系列應(yīng)變傳感器成功監(jiān)測了處于模擬施工現(xiàn)場環(huán)境下，高性能混凝土柱早期自收縮變形特性，特別是混凝土澆注后24h的自收縮變形情況。從試驗結(jié)果看，硬化前后24h高性能混凝土的自收縮變形增長最快，絕對變形值也比較大，24h自收縮值超過14d自收縮變形量的70%；而配筋混凝土試件由于配筋形成的鋼骨架對自收縮的約束作用，其自收縮變形小于同等條件的素混凝土試件。監(jiān)測和分析高性能混凝土結(jié)構(gòu)早期的自收縮變形將對減少結(jié)構(gòu)微裂紋、提高結(jié)構(gòu)的穩(wěn)定性有重要意義。
［關(guān)鍵詞］高性能混凝土；早期自收縮；埋設(shè)型應(yīng)變傳感器
Early-age autogenous shrinkage experimental study of high performance concrete column under construction-site conditions
Yun Yingwei 1, He Pengli 1, Cai Yanhong 2(1 Civil Engineering Department, Luoyang Institute of Science and Technology, Luoyang 471023, China;2 State Key Laboratory of High Performance Ceramics and Superfine Microstructure, ShanghaiInstitute of Ceramics Chinese Academy of Science, Shanghai 200050, China)
Abstract:The early\|age autogenous shrinkage of HPC column under construction-site conditions is monitored successfully, especially the first 24-hour deformation just after casting by KM100B strain transducer. The experimental results show that HPC autogenous shrinkage rapidly increases within first 24 hours just after HPC casting, and first-day autogenous shrinkage is 70% larger than the total one within 14 days. And the autogenous shrinkage of reinforced specimen is smaller than that of plain specimen due to restraint of reinforcing frame. Monitoring and analyzing early-age autogenous shrinkage of HPC will give significant reference to study the durability and permeability of HPC structures.
Keywords:high performance concrete; early-age autogenous shrinkage; embedded stain transducer
洛陽理工學(xué)院人才引進科研基金資助。
作者簡介：贠英偉，博士研究生，講師，Email:Yunyingwei1979@yahoo.com.cn。
參考文獻
［1］TAZAWA E,MIYAZAWA S. Autogenous shrinkage of concrete and its importance in concrete technology［C］// Creep and Shrinkage of Concrete. Proceedings of the 5th International RILEM. London:Symposium, E & FN Spon,1993: 59-168.
［2］AICTIN P C, NEVILLE A M, ACKER P. Integrated view of shrinkage deformation［J］. Concrete International,1997, 19 (9): 35-41.
［3］AICTIN P C Autogenous shrinkage measurement［Ｇ］//Autogenous Shrinkage of Concrete.E & FN Spon, 1999: 257-268.
［4］NFDA4英偉,張廣峻,張百歲,等. FBG傳感器監(jiān)測高性能混凝土早期特性的試驗研究［J］. 混凝土，2008(5)：124-127.
［5］朱永,陳偉民,封君,等.混凝土固化期收縮應(yīng)變監(jiān)測的光纖琺珀傳感器［J］.土木工程學(xué)報,2001,34(5):24-28.
［6］Il YOUNG JANG,et al. The short term property monitoring for HPC columns by embedded FBG sensor［J］. Annual Report of Institute of Industrial Technology Kumoh National of Technology, 2007, 22: 31-42.
［7］GB/T50081—2002 普通混凝土力學(xué)性能試驗方法標(biāo)準(zhǔn)［S］. 北京：中國建筑工業(yè)出版社，2002.
［8］HEDLUND H. Stresses in High Performance Concrete due to Temperature and Moisture Variations at Early Ages［D］. Lule, Sweden: Lule University of Technology, 1996.
［9］BYFORS J. Plain Concrete at Early Ages［R］.Swedish Cement and Concrete Research Institute Report,1980.
