[1]蒋金洋,孙伟,张云升,等.超高程泵送钢纤维混凝土的抗裂性能[J].东南大学学报(自然科学版),2007,37(1):123-127.[doi:10.3969/j.issn.1001-0505.2007.01.026]
 Jiang Jinyang,Sun Wei,Zhang Yunsheng,et al.Research on cracking resistance performance of super vertical-distance pumped steel fiber concrete[J].Journal of Southeast University (Natural Science Edition),2007,37(1):123-127.[doi:10.3969/j.issn.1001-0505.2007.01.026]
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超高程泵送钢纤维混凝土的抗裂性能()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
37
期数:
2007年第1期
页码:
123-127
栏目:
材料科学与工程
出版日期:
2007-01-20

文章信息/Info

Title:
Research on cracking resistance performance of super vertical-distance pumped steel fiber concrete
作者:
蒋金洋 孙伟 张云升 秦鸿根 王晶
东南大学材料科学与工程学院, 南京 211189
Author(s):
Jiang Jinyang Sun Wei Zhang Yunsheng Qin Honggen Wang Jing
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
关键词:
钢纤维混凝土 可泵性 抗裂度 裂缝宽度 粘结力 轴心抗拉强度
Keywords:
SFRC pumpability cracking strength crack width bond stress direct tensile strength
分类号:
TU502
DOI:
10.3969/j.issn.1001-0505.2007.01.026
摘要:
针对超高索塔锚固区的特点,按照抗裂最优,又能高空泵送的原则,制备了钢纤维混凝土,并对其构件的抗裂性能进行了研究.优选出的钢纤维混凝土1 h内泵送性能良好,可以实现一次泵送到306 m的目标.经过计算,纤维体积率为0.8%的钢纤维混凝土能使混凝土结构裂缝的最大宽度降低32%.通过对索塔锚固区的足尺模型试验研究得出:该钢纤维混凝土不仅能够显著提高索塔锚固区混凝土结构的抗裂度和极限载荷,而且能使混凝土结构正常使用极限状态下的载荷增大了将近40%.试验结果也表明其能显著抑制塑性收缩,并且能使干燥收缩值降低50%,同时又具有较高的抗拉强度和钢筋握裹力.
Abstract:
The mix ratio of steel fiber reinforced concrete(SFRC)is optimized by the principles that workability meets the pumping demand and the anti-cracking performance is optimal. The effect of SFRC on the anti-crack performance of reinforced concrete(RC)member is analyzed. It is found that the admixture has good preservation of moisture and adhesion and the fibers distribute homogeneously in one hour out of machine. According to the pumping results, the SFRC can be pumped vertically up to 306 m. Based on the standard computation formula of cracks, the maximum crack width of RC member with 0.8% steel fiber(by volume)is about 32% lower than that of RC member. A experimental research on the full-scale model tests for the steel and concrete composite anchorage zone on the pylon shows that the SFRC not only remarkably increases the crack resistance and the ultimate load, but also makes an enlargement of nearly 40% on the load under normal service conditions. It is also indicated that plastic shrinkage cracking of SFRC in which volume fraction of steel fibers is 0.8% can be restrained obviously and the unrestrained drying shrinkage can be diminished by about 50% at early age. The results confirm that the SFRC can lessen the shrinkage crack of concrete, enhance markedly the bond stress of steel-rebar and the direct tensile strength.

参考文献/References:

[1] Barragán Bryan E,Ravindra Gettu.Uniaxial tension test for steel fibre reinforced concrete — a parametric study [J]. Cement and Concrete Composites,2003,25(7):767-777.
[2] Lee M K,Barr B I G.An overview of the fatigue behaviour of plain and fiber reinforced concrete[J].Cement & Concrete Composites, 2004,26(4):299-305.
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  Jiang Jinyang,Sun Wei,Dai Jie,et al.The key properties and test study of super vertical-distance pumped steel fiber concrete[J]. Journal of Dalian University of Technology, 2007.(to appear)(in Chinese)
[5] 黄承逵.纤维混凝土结构[M].北京:机械工业出版社,2004:140-143.
[6] 中国工程院土木水利与建筑学部,工程结构安全性与耐久性研究咨询项目组.混凝土结构耐久性设计与施工指南[M].北京:中国建筑工业出版社,2004:31-36.
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相似文献/References:

[1]刘永光,曾庆敦.钢纤维混凝土桥面铺装层的细观应力破坏分析[J].东南大学学报(自然科学版),2006,36(5):799.[doi:10.3969/j.issn.1001-0505.2006.05.024]
 Liu Yongguang,Zeng Qingdun.Micro-stress failure analysis of bridge pavement of steel fiber[J].Journal of Southeast University (Natural Science Edition),2006,36(1):799.[doi:10.3969/j.issn.1001-0505.2006.05.024]

备注/Memo

备注/Memo:
基金项目: 国家自然科学基金重点资助项目(59938170)、江苏省重大工程资助项目(STDQ-04HT20SY-010).
作者简介: 蒋金洋(1974—),男,博士生, jinyangjiang@163.com; 孙伟(联系人),女,教授,博士生导师,中国工程院院士,sunwei@seu.edu.cn.
更新日期/Last Update: 2007-01-20