粉煤灰综合利用 2012 NO.2FLYASHCOMPREHENSIVEUTILIZATION
圆环法研究再生微粉混凝土收缩性能* Study on Shrinkage Performance of Concrete Containing Re-production Powder using Ring Test 高志楼',刘小艳²,左俊卿”,窦兰权,王新瑞2 (1.中交一航局第一工程有限公司,天津300456; 2.河海大学力学与材料学院,江苏南京210098; 3.同济大学先进土木工程材料教育部重点实验室,上海201804; 4.中冶天工上海十三冶建设有限公司城市建设分公司,上海200901) 摘要:采用圆环试验方法研究了再生微粉掺合料对混凝土收缩开裂趋势的影响,并测定了再生微粉混凝土早期 干燥收缩性能。
试验结果表明,圆环试验能给混凝土提供了完全的、均匀的约束,能合理评价混凝土抵抗自收缩和干燥 收缩综合作用开裂的能力。
再生微粉掺合料能明显降低混凝土收缩开裂趋势及干燥收缩性能;且微粉细度越大,再生微 粉混凝土抗收缩抗裂性能越好。
试验结合SEM试验结果,分析了再生微粉掺合料减小水泥基材料收缩开裂趋势的原 因。
关键词:再生微粉:混凝土;收缩 中图分类号:TU528.0文献标识码:A文章编号:1005-8249(2012)02-0006-05 Gao Zhi-lou' , Liu Xiao-yan ,Zuo Jun-qing² ,Dou Lan-quan*, Wang Xin-rui (1. No. 1 Engineering Company LTD. of CCCC First Harbor Engineering Company Limited, Tianjin,300456; 2.College of Mechanics and Materials,Hohai University,Nanjing 210098; 3. Key Laboratory of Advanced Civil Enginering Materials (Tongi Universty), Ministry of Education, Shanghai 201804; 4. CMTCC SHANGHAI SHISANYE Construction Co.,Lud., Shanghai,China 200901) Abstract Inthis paer, rng tet was used to study the infueneof re-prodaction power on shnkage cracking trends of conre, and tet earl-age drying shinkge efane freprdtin er rete hw that the ring te canrebly nticacking p- ty of conerete caused by autogenous shrinkage and drying shrinkage, providing concrete a plete and uniform bound.Re-production powder can signifcantly redue the shrinkage crcking trends of onerete and the drying shnkage perfomance.The finer the powder was, the better was he anti-cracking property of concrete was Combined with Scanning electron microscopy. (SEM) the test was used to analyse the reason of reducing the shinkage cracking tredsby reprdutio pe. Key words;re-prduction powder; concrete;shrinkage performance
性问题备受关注。
体积稳定性是混凝土达到耐久性的响混凝土收缩开裂性的因素很多,如水泥品种、水灰 前提,体积稳定性不良的直接后果可引发裂缝"。
混比、骨料、矿物掺合料、外加剂、养护条件等等。
矿物掺 凝土早期由于自由收缩变形受到限制产生拉应力,当合料是其中很重要的一个因素。
本文基于圆环试验 法,用由废弃混凝土经破碎、磨细而成的再生微粉I、 “基金项目:河海大学学生科技基金资助项目(K200805)微粉Ⅱ以及矿粉以等掺量取代水泥对比研究混凝土收 第一作者:高志楼,(...