[1] Saly Fathy, Sun Wei,. Influence of different curing regimes on the microstructureand macro performance of UHPFRCC [J]. Journal of Southeast University (English Edition), 2014, 30 (3): 348-352. [doi:10.3969/j.issn.1003-7985.2014.03.017]

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Influence of different curing regimes on the microstructureand macro performance of UHPFRCC()

养护制度对超高性能纤维增强水泥基复合材料 微观结构及宏观性能的影响

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

Volumn:

30

Issue:

2014 3

Page:

348-352

Research Field:

Materials Sciences and Engineering

Publishing date:

2014-09-30

Info

Title:

Influence of different curing regimes on the microstructureand macro performance of UHPFRCC

养护制度对超高性能纤维增强水泥基复合材料 微观结构及宏观性能的影响

Author(s):

Saly Fathy;  Sun Wei

School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

Saly Fathy;  孙伟

东南大学材料科学与工程学院, 南京 211189

Keywords:

ultra-high performance fiber reinforced cementitious composite(UHPFRCC);  curing regimes;  durability;  microstructure

超高性能纤维增强水泥基复合材料;  养护制度;  耐久性;  微观结构

PACS:

TU528

DOI:

10.3969/j.issn.1003-7985.2014.03.017

Abstract:

This study investigates the influence of different curing regimes on the microstructure and macro properties of ultra-high performance fiber reinforced cementitious composite(UHPFRCC), and aims to discover whether it is possible to produce qualified UHPFRCC using different curing regimes. A control mix of UHPFRCC is prepared. The mechanical performance and the short-term durability of the UHPFRCC matrix under three curing regimes are studied. In addition, the microstructures of the UHPFRCC matrix with different curing conditions are analyzed by combining scanning electron microscopy(SEM)and mercury intrusion porosimetry(MIP). The results explore how different UHPFRCC curing regimes affect its microstructure and how the microstructure affects its macro behavior. Heat and steam curing for 3 d is succeeded to produce the UHPFRCC with nearly the same mechanical properties and durability as those of the 90 d standard curing. However, the heat cured UHPFRCC does not show great resistance to chloride-ion penetration.

研究了不同养护制度对超高性能纤维增强水泥基复合材料(UHPFRCC)微观结构和宏观性能的影响, 并揭示了用不同的养护制度制备性能符合要求的超高性能纤维增强水泥基复合材料的可能性.制备了一种基准的UHPFRCC, 研究了3种养护制度下UHPFRCC 的力学性能及短期耐久性能.此外, 通过结合运用电子扫描电镜(SEM)和压汞法(MIP), 测试了3种养护制度下UHPFRCC的微观结果.研究结果揭示了不同的养护制度对UHPFRCC微观结构的影响以及微观结构对材料宏观性能的影响机制.热养护和蒸汽养护3d与标准养护90 d的UHPFRCC具有相近的力学性能和耐久性.但是, 热养护的UHPFRCC具有相对较差的抗氯离子渗透性能.

References:

[1] Hong K N, Kang S T, Kim S W, et al. Material properties of air-cured ultra-high-performance steel-fiber-reinforced concrete at early ages[J]. International Journal of the Physical Sciences, 2010, 5(17): 2622-2634.
[2] Graybeal B. Ultra-high performance concrete, FHWA-HRT-11-038 [R]. Mclean, VA, USA: Federal Highway Administration, 2011.
[3] Yang S, Millard S, Soutsos M, et al. Influence of aggregate and curing regime on the mechanical properties of ultra-high performance fibre reinforced concrete(UHPFRC)[J]. Construction and Building Materials, 2009, 23(6): 2291-2298.
[4] Yazici H. The effect of curing conditions on compressive strength of ultra high strength concrete with high volume mineral admixtures [J]. Building and Environment, 2007, 42(5): 2083-2089.
[5] Habel K, Viviani M, Denarié E, et al. Development of the mechanical properties of an ultra-high performance fiber reinforced concrete(UHPFRC)[J]. Cement and Concrete Research, 2006, 36(7): 1362-1370.
[6] Nordtest. Concrete hardened: accelerated chloride penetration, NT Build 443 [R]. Espoo, Finland: Nordtest, 1995.
[7] Zhang Y S, Sun W, Chen S D, 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.
[8] Habel K, Charron J P, Braike S, et al. Ultra-high performance fibre reinforced concrete mix design in central Canada [J]. Canadian Journal of Civil Engineering, 2008, 35(2): 217-224.
[9] Abell A B, Willis K L, Lange D A. Mercury intrusion porosimetry and image analysis of cement-based materials [J]. Journal of Colloid and Interface Science, 1999, 211(1):39-44.

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 Scholarship Supported by the China Scholarship Council, the Technical Research Program from NV Bekaert SA of Belgium, the National Natural Science Foundation of China(No.50908047).
Citation: Saly Fathy, Sun Wei.Influence of different curing regimes on the microstructure and macro performance of UHPFRCC[J].Journal of Southeast University(English Edition), 2014, 30(3):348-352.[doi:10.3969/j.issn.1003-7985.2014.03.017]

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