[1] Tian Qian, Sun Wei, Liu Jiaping, et al. Performance of grouts for post-tensioned prestressed structures [J]. Journal of Southeast University (English Edition), 2004, 20 (4): 492-497. [doi:10.3969/j.issn.1003-7985.2004.04.020]

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Performance of grouts for post-tensioned prestressed structures()

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

Volumn:

20

Issue:

2004 4

Page:

492-497

Research Field:

Civil Engineering

Publishing date:

2004-12-30

Info

Title:

Performance of grouts for post-tensioned prestressed structures

Author(s):

Tian Qian¹;  2;  Sun Wei¹;  Liu Jiaping²;  Miao Changwen²

¹Department of Materials Science and Engineering, Southeast University, Nanjing 210096, China
²Jiangsu Institute of Building Science, Nanjing 210008, China

Keywords:

post-tensioned;  cement;  grout;  deformation behavior;  microstructure;  admixture

PACS:

TU39

DOI:

10.3969/j.issn.1003-7985.2004.04.020

Abstract:

New high performance grouts with high volume stability and good fluidity are prepared with Portland cement and a multifunctional admixture(MFA). The rheological characteristics and mechanical performance of the grouts are investigated. The addition of MFA effectively improves the pseudo-plasticity of the grout. The Ma cone flow time decreases obviously, and the bleeding rate tends to be zero. The deformation behaviors of fresh mixture and hardened grout are systematically studied. Mercury injection method(MIP), scanning electron microscopy(SEM)and X-ray diffractory analysis experiments are used to analyze the microstructure evolution of the grouts, which manifests that the co-action of the early bubble reaction and the latter ettringite crystallization ensure the volume stability throughout the whole hydration process and result in refined pore structure of the grout.

References:

[1] Schokker A J, Breen J E, Kreger M E. Grouts for bonded post-tensioned in corrosive environments [J]. ACI Mater J, 2001, 98(4): 296-305.
[2] Kroggel O, Jansohn R, Ratmann M. Progress in application of ultrasound in pulse-echo-technique to examine concrete structures [J]. NDT & E International, 1997, 30(4): 257-265.
[3] Ashar H, Jeng D. Effectiveness of inservice inspection requirements of prestressed concrete containments US experience [A]. In: Proceedings of the Second International Conference on Containment Design and Operation [C]. Toronto, 1990, 2: 222-1236.
[4] Fu Peixing, Li Chenguang. Study of high performance grout material for post-tensioned prestressed structures [J]. Building Technique Development, 1997, 24(5): 21-25.(in Chinese)
[5] Zhao Yuezhou, Hao Faling, Chen Jie. Cause analysis and solution of grouting duct blockage in post-tensioning concrete tube structure construction [J]. Architecture Technology, 2000, 31(7): 458-459.(in Chinese)
[6] Lura P. Autogenous deformation and internal curing of concrete [D]. Delft, Netherlands: University of Delft, 2003. 63-75.
[7] Ei-Ichi Tazawa. Autogenous shrinkage of concrete [A]. In: Proceedings of the International Workshop [C]. Hiroshima: Japan Concrete Institute, 1998. 1-67.

Memo

Memo:

Biographies: Tian Qian(1973—), female, graduate, senior engineer; Sun Wei(corresponding author), female, professor, sunsei@seu.edu.cn.

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