[1] Saly Fathy, Gu Chunping, Sun Wei, et al. Main properties of ultra-high performance fiber reinforcedcement composites under couple effect of load and environment [J]. Journal of Southeast University (English Edition), 2012, 28 (2): 184-189. [doi:10.3969/j.issn.1003-7985.2012.02.010]

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Main properties of ultra-high performance fiber reinforcedcement composites under couple effect of load and environment()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

28

Issue:

2012 2

Page:

184-189

Research Field:

Materials Sciences and Engineering

Publishing date:

2012-06-30

Info

Title:

Main properties of ultra-high performance fiber reinforcedcement composites under couple effect of load and environment

Author(s):

Saly Fathy¹;  2;  Gu Chunping¹;  Sun Wei¹

¹ School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
²Department of Civil Engineering, Alexandria University, Alexandria 21532, Egypt

Keywords:

ultra-high performance fiber reinforced cementitious composite;  couple effect of load and environment;  mechanical properties;  durability

PACS:

TU528

DOI:

10.3969/j.issn.1003-7985.2012.02.010

Abstract:

This study aims to reveal the mechanism that how the content of steel fibers and strength grades affect the macro performance of the ultra-high performance fiber reinforced cementitious composite(UHPFRCC)and to study the UHPFRCC durability under the combined effect of loads and environments. Three types of high and ultra-high performance fiber reinforced cement composites with different strength grades(100, 150, 200 MPa)and different steel fiber volume fractions(0%, 1%, 2%, 3%)are prepared. The main properties of mechanical performance and short-term durability are studied. A preloading frame is designed to apply a four-point load external flexural stress with a stress selection ratio of 0.5 for UHPFRCC150 specimens. The results show that the growth in strength grade with a proper content of steel fiber greatly increases the strength and toughness of the HPFRCC and the UHPFRCC while decreasing the dry-shrinkage ratio. For the loaded specimens, the existence of steel fiber can reduce the negative influence of tensile stress on the Cl^- penetration resistance of the UHPFRCC in addition to improving its ability to resist the freeze-thaw damage.

References:

[1] Katrin H, Marco V. Development of the mechanical properties of an ultra-high performance fiber reinforced concrete(UHPFRC)[J]. Cement and Concrete Research, 2006, 36(7): 1362-1370.
[2] Maher K T, George M. Application of ultra-high performance concrete to bridge girders. NDOR: P310[R]. Lincoln: Nebraska Department of Roads(NDOR), 2009.
[3] Sun Wei. New research and application progress of high performance concrete in China [R]. Nanjing, China: Southeast University, 2010.
[4] Zhang Yunsheng, Sun Wei, Chen Shudong, et al.. 1D and 2D carbonation of fly ash concrete under flexural stress [J]. Journal of Southeast University: Natural Science Edition, 2007, 37(1):118-122.(in Chinese)
[5] Zhang Yunsheng, Sun Wei, Chen Shudong, et al. One and two dimensional chloride ion diffusion of fly ash concrete under flexural stress [J]. Journal of Zhejiang University: Science A, 2011, 12(9): 692-701.
[6] Diao Bo, Sun Yang, Cheng Shaohong, et al. Effects of mixed corrosion, freeze-thaw cycles, and persistent loads on behavior of reinforced concrete beams [J]. Journal of Cold Regions Engineering, 2010, 25(1): 37-52.
[7] Nordtest method. Concrete, hardened: accelerated chloride penetration. NT Build 443 [R]. Espoo, Finland: Nordtest, 1995.
[8] Li V C, Strang H, Krenchel H. Micromechanics of crack bridging in fiber-reinforced concrete [J]. Materials and Structures, 1993, 26(8): 486-494.
[9] Yan Handong, Sun Wei, Chen Huisu. The effect of silica fume and steel fiber on dynamic mechanical performance of high-strength concrete [J]. Cement and Concrete Research, 1999, 29(3): 423-426.
[10] Sun Wei, Chen Huisu, Luo Xin, et al. The effect of hybrid fibers and expansive agent on the shrinkage and permeability of high-performance concrete [J]. Cement and Concrete Research, 2001, 31(4):595-601.
[11] Behfarnia K. Studying the effect of freeze and thaw cycles on bond strength of concrete repair materials [J]. Asian Journal of Civil Engineering (Building and Housing), 2010, 11(2): 165-172.

Memo

Memo:

Biographies: Saly Fathy(1985—), female, graduate; Sun Wei(corresponding author), female, professor, academician of China Engineering Academy, sunwei@seu.edu.cn.
Foundation items: The Technical Research Program from NV Bekaert SA of Belgium(No.8612000003), the National Natural Science Foundation of China(No.50908047).
Citation: Saly Fathy, Gu Chunping, Sun Wei.Main properties of ultra-high performance fiber reinforced cement composites under couple effect of load and environment[J].Journal of Southeast University(English Edition), 2012, 28(2):184-189.[doi:10.3969/j.issn.1003-7985.2012.02.010]

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