[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(
)
后张有粘结预应力结构灌浆料性能研究
)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
- 后张有粘结预应力结构灌浆料性能研究
- 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.
- 采用波特兰水泥和一种多功能的外加剂(MFA), 配制出具有高流动性和体积稳定性的高性能灌浆料, 并对其流变性能和力学性能进行了试验研究. MFA的加入有效地改善了浆体的假塑性, 不仅显著降低了马氏锥的流动时间, 而且消除了浆体的泌水. 对浆体在新拌阶段和硬化阶段的变形行为进行了全过程的试验研究. 采用MIP, SEM和X-rays等测试手段对浆体微观结构的演变进行了分析. 试验结果表明, 早期的发气以及后期钙矾石结晶的协同作用, 不仅保障了灌浆料在整个水化过程中的体积稳定性, 而且细化了孔结构.
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.