[1]高英力,周士琼,马保国.UFA水泥基材料早期自收缩与干燥收缩研究[J].深圳大学学报理工版,2008,25(1):97-102.
 GAO Ying-li,ZHOU Shi-qiong,and MA Bao-guo.Early autogenous shrinkage and dry shrinkage of cement based materials containing ultra-fine fly ash[J].Journal of Shenzhen University Science and Engineering,2008,25(1):97-102.
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UFA水泥基材料早期自收缩与干燥收缩研究()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第25卷
期数:
2008年1期
页码:
97-102
栏目:
材料科学
出版日期:
2008-01-30

文章信息/Info

Title:
Early autogenous shrinkage and dry shrinkage of cement based materials containing ultra-fine fly ash
文章编号:
1000-2618(2008)01-0097-06
作者:
高英力12周士琼3马保国2
1)长沙理工大学公路工程学院,长沙 410076;
2)武汉理工大学硅酸盐材料工程教育部重点实验室,武汉 430070;
3)中南大学土木建筑学院,长沙 410075
Author(s):
GAO Ying-li12ZHOU Shi-qiong2and MA Bao-guo3
1)College of Highway Engineering,Changsha University of Science Technology,Changsha 410076,P. R. China
2)Key Laboratory of Silicate Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,P. R. China
3)Civil Architectural Engineering College,Central South University,Changsha 410075,P. R. China
关键词:
超细粉煤灰水泥基复合胶凝材料自收缩干燥收缩
Keywords:
ultra-fine fly ashcomposite cement based materialsautogenous shrinkagedry shrinkage
分类号:
TU 528.041;TU 528.044
文献标志码:
A
摘要:
低水胶比条件下水泥基材料的自收缩率已超过干燥收缩率成为导致混凝土过早开裂的隐患.以超细粉煤灰(ultra-fine fly ash,UFA)等量取代水泥20%~40%,配制了UFA水泥基复合胶凝材料,分别对固定水胶比和变水胶比两种情况下的UFA水泥砂浆早期(7 d前)自收缩变形和干燥收缩变形进行试验研究.结果表明,在固定水胶比条件下,砂浆的自收缩率随UFA掺量增加递减,而干缩率却随之增大;在变水胶比条件下,砂浆的自收缩率随水胶比的增加递减,干缩率随之增大.且回归分析表明两种情况下砂浆的自收缩及干燥收缩变形均表现出较好的线性相关;UFA对水泥基材料改性作用明显,在保持相同流动度条件下,UFA的掺入可有效降低用水量,早期及后期强度能赶上甚至超过基准水泥胶砂,弥补了UFA早期不水化所引发的早期强度低缺陷;微观测试表明,UFA在水泥基材料中起到了较好的密实填充、减水分散及增强作用.
Abstract:
Autogenous shrinkage and dry shrinkage of cement based materials, produced by lower water/binder ratios, are the key factors? resulting in the concrete early cracking. Experiments on ultra-fine fly ash (UFA) replaced 20%~40% equivalent cement and UFA blended cement mortars were conducted. Experimental results show that autogenous shrinkage (before 7-day) of UFA mortar reduces and dry shrinkage increase with increase of UFA amount under the condition of fixed water/binder ratio. On the other hand, the autogenous shrinkage of UFA blended cement mortar reduces and dry shrinkage increase with increase of water/binder ratio under the condition of variable water/binder ratio. The better linear relationship between autogenous shrinkage and dry shrinkage is shown by regression analysis. The addition of UFA reduces water demand of cement based materials under the condition of keeping the same fluidity,so early strength and long-term strength of UFA mortar catch or surpass that of reference cement mortar, solving the problem of early strength of UFA mortar being lower because of no hydrating of UFA. The microscopic test results indicate that UFA has the better effects on dense packing, water reducing, dispersing and strength increasing.

参考文献/References:

[1]冯乃谦.实用混凝土大全[M]. 北京: 科学出版社, 2001.
[2]安明哲, 覃维祖, 朱金铨. 高强混凝土的自收缩试验研究[J]. 山东建材学院学报, 1998(6):139-143
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[4]Termkhajornkit Pipat, Nawa Toyoharu, Nakai Masashi. 粉煤灰对自收缩率的影响[J]. 水泥与混凝土研究, 2005, 35(3): 473-482(英文版).
[5]高英力,周士琼. 超细粉煤灰对水泥浆体水化收缩率的影响[J]. Journal of Central South University of Technology (English edition), 2005, 12(5): 596-600(英文版).
[6]谢友均, 马昆林, 刘运华,等. 蒸养超细粉煤灰高性能混凝土性能试验研究[J]. 深圳大学学报理工版, 2007, 24(3): 234-239.

[1]FENG Nai-qian. Practical Concrete Entire [M]. Beijing: Scientice Press, 2001 (in Chinese).
[2]AN Ming-zhe, QIN Wei-zu, ZHU Jin-quan. Study on autogenous of high strength concrete [J]. Journal of Shandong Building Material College, 1998(6):139-143 (in Chinese).
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[4]Termkhajornkit Pipat, Nawa Toyoharu, Nakai Masashi. Effect of fly ash on autogenous shrinkage [J]. Cement and Concrete Research, 2005, 35(3): 473-482.
[5]GAO Ying-li, ZHOU Shi-qiong. Influence of ultra-fine fly ash on hydration shrinkage of cement paste [J]. Journal of Central South University of Technology, 2005, 12(5): 596-600.
[6]XIE You-jun, MA Kun-lin, LIU Yun-hua, et al. Experimental studies on capabilities of steam curing ultra-fine fly ash high performance concrete[J]. Journal of Shenzhen University Science and Engineering,2007, 24(3): 234-239(in Chinese).

相似文献/References:

[1]谢友均,马昆林,刘运华,等.蒸养超细粉煤灰高性能混凝土性能试验研究[J].深圳大学学报理工版,2007,24(3):234.
 XIE You-jun,MA Kun-lin,LIU Yun-hua,et al.Experimental studies on capabilities of steam curing ultra-fine fly ash high performance concrete[J].Journal of Shenzhen University Science and Engineering,2007,24(1):234.

备注/Memo

备注/Memo:
收稿日期:2006-11-08;修回日期:2007-09-14
基金项目:国家高技术研究发展计划资助项目 (2005AA332010);中国博士后科学基金资助项目(20070410969)
作者简介:高英力(1977-),男(汉族),湖北省荆州市人,武汉理工大学讲师、博士.E-mail:stauny@sohu.com
通讯作者:周士琼(1939-),女(汉族),中南大学教授、博士生导师.E-mail:csuhpc@mail.csu.edu.cn
更新日期/Last Update: 2008-02-17