[1]张丽辉,郭丽萍,孙伟,等.高延性水泥基复合材料的流变特性和纤维分散性[J].东南大学学报(自然科学版),2014,44(5):1037-1040.[doi:10.3969/j.issn.1001-0505.2014.05.028]
 Zhang Lihui,Guo Liping,Sun Wei,et al.Rheological property and fiber dispersion of high ductility cementitious composites[J].Journal of Southeast University (Natural Science Edition),2014,44(5):1037-1040.[doi:10.3969/j.issn.1001-0505.2014.05.028]
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高延性水泥基复合材料的流变特性和纤维分散性()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
44
期数:
2014年第5期
页码:
1037-1040
栏目:
材料科学与工程
出版日期:
2014-09-20

文章信息/Info

Title:
Rheological property and fiber dispersion of high ductility cementitious composites
作者:
张丽辉1郭丽萍123孙伟123张文潇1谌正凯1
1东南大学材料科学与工程学院, 南京 211189; 2东南大学先进土木工程材料协同创新中心, 南京 211189; 3东南大学江苏省土木工程材料重点实验室, 南京 211189
Author(s):
Zhang Lihui1 Guo Liping123 Sun Wei123 Zhang Wenxiao1 Chen Zhengkai1
1School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2Collaborative Innovation Center for Advanced Civil Engineering Materials, Southeast University, Nanjing 211189, China
3Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
关键词:
高延性水泥基复合材料 流变特性 荧光显微分析技术 分散系数 聚乙烯醇纤维
Keywords:
high ductility cementitious composites(HDCC) rheological property fluorescence microscopy technology dispersion coefficient polyvinyl alcohol fiber
分类号:
TU528
DOI:
10.3969/j.issn.1001-0505.2014.05.028
摘要:
为了研究高延性水泥基复合材料(HDCC)流变特性对短切聚乙烯醇(PVA)纤维分散性的影响规律,采用流变仪和荧光显微分析技术分别对HDCC浆体的流变特性以及短切PVA纤维在HDCC基体中的分散性进行研究.实验结果表明:HDCC浆体流变行为符合赫切尔-巴尔克模型,浆体流动后,应变梯度随应力增量按幂指数增长;当HDCC浆体塑性黏度为1.3~7.3 Pa·s时,即使短切PVA纤维的体积掺量为1.5%~2.0%,纤维在HDCC基体中的分散系数均大于0.92,实现了均匀分散.合理调整配比中粉煤灰、减水剂和功能性组分的掺量,可调控HDCC浆体塑性黏度并实现短切PVA纤维的均匀分散,为HDCC高延性的理论设计提供实验支持.
Abstract:
In order to investigate the influence of rheological property of high ductility cementitious composites(HDCC)on the dispersion of domestic short polyvinyl alcohol(PVA)fiber, rheometer and fluorescence microscopy technology are used to study the rheological properties of HDCC and the fiber dispersion of PVA fiber in HDCC, respectively. The experimental results reveal that the rheological behavior of HDCC slurry conforms to the Herschel-Bulkley model, in which the shear strain rate exponentially increases with the increment of the shear stress after flowing. Furthermore, when the plastic viscosity of HDCC slurry is around 1.3 to 7.3 Pa·s, even though the volume dosage of short PVA fiber is 1.5% to 2.0%, the dispersion coefficient is also more than 0.92. Thus, the short PVA fiber is dispersed in the HDCC matrix homogenously. Therefore, by reasonably regulating the content of fly ash, superplasticizer and functional components, plastic viscosity of HDCC mortar can be controlled and homogeneous distribution of PVA fibers can be achieved, which provides an experimental support for high ductility design of HDCC.

参考文献/References:

[1] Park W S, Yun H D. Seismic performance of pseudo strain-hardening cementitious composite coupling beams with different reinforcement details[J]. Composites Part B: Engineering, 2011, 42(6): 1427-1445.
[2] Ozbay E, Karahan O, Lachemi M, et al. Dual effectiveness of freezing-thawing and sulfate attack on high-volume slag-incorporated ECC[J]. Composites Part B: Engineering, 2013, 45(1): 1384-1390.
[3] Sahmaran M, Li V C. Durability of mechanically loaded engineered cementitious composites under highly alkaline environments[J]. Cement and Concrete Research, 2008, 30(2): 72-81.
[4] Sahmaran M, Li V C. Durability properties of micro-cracked ECC containing high volumes fly ash[J]. Cement and Concrete Composites, 2009, 39(11):1033-1043.
[5] Zhang Z G, Qian S Z, Ma H. Investigating mechanical properties and self-healing behavior of micao-cracked ECC with different volume of fly ash[J]. Construction and Building Materials, 2014, 52: 17-23.
[6] Li V C. Tailoring ECC for special attributes: a review[J]. International Journal of Concrete Structures and Materials, 2012, 6(3): 135-144.
[7] 张帅. 增稠剂在PVA超高韧性水泥基复合材料中的应用[D]. 大连:大连理工大学土木工程学院,2007.
[8] Ozyurt N, Mason T O, Shah S P. Correlation of fiber dispersion, rheology and mechanical performance of FRCs[J]. Cement and Concrete Composites, 2007, 29(2): 70-79.
[9] Boulekbache B, Hamart M, Chemrouk M, et al. Flowability of fiber-reinforced concrete and its effect on the mechanical properties of the material[J].Construct and Building Materials, 2010, 24(9): 1664-1671.
[10] Yang E H, Sahmaran M, Yang Y, et al. Rheological control in the production of engineered cementitious composites[J]. ACI Materials Journal, 2009, 106(4): 357-366.
[11] Li M, Li V C. Rheology, fiber dispersion, and robust properties of engineered cementitious composites[J]. Materials and Structures, 2013, 46(3): 405-420.
[12] Lee B Y, Kim J K, Kim J S, et al. Quantitative evaluation technique of polyvinyl alcohol(PVA)fiber dispersion in engineered cementitious composites[J].Cement and Concrete Composites, 2009, 31(6): 408-417.
[13] de Larrard F. Concrete mixture proportioning: a scientific approach[M]. London: E& FN Spon,1999:77-122.
[14] 刘建忠. 超高性能水泥基复合材料制备技术及静动态拉伸行为研究[D]. 南京:东南大学材料科学与工程学院,2013.

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备注/Memo

备注/Memo:
收稿日期: 2014-01-13.
作者简介: 张丽辉(1989—),女,硕士生;郭丽萍(联系人),女,博士,副教授, guoliping691@163.com.
基金项目: 国家自然科学基金资助项目(51378113)、中央高校基本科研业务费专项资金资助项目(26220120012).
引用本文: 张丽辉,郭丽萍,孙伟,等.高延性水泥基复合材料的流变特性和纤维分散性[J].东南大学学报:自然科学版,2014,44(5):1037-1040. [doi:10.3969/j.issn.1001-0505.2014.05.028]
更新日期/Last Update: 2014-09-20