| 引用本文: | 蒋金洋,孙伟,张云升,秦鸿根,王晶.超高索塔锚固区泵送钢纤维混凝土的制备[J].哈尔滨工业大学学报,2010,42(2):307.DOI:10.11918/j.issn.0367-6234.2010.02.028 |
| JIANG Jin-yang,SUN Wei,ZHANG Yun-sheng,QIN Hong-gen,WANG Jing.Preparation of super-high pumping SFRC in anchorage zone between steel anchorage box and cable[J].Journal of Harbin Institute of Technology,2010,42(2):307.DOI:10.11918/j.issn.0367-6234.2010.02.028 |
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| 摘要: |
| 为了提高索塔锚固区混凝土结构的抗裂性能和力学行为,经过优化混凝土基体组成和纤维外形与尺度,制备了索塔锚固区专用的钢纤维混凝土材料.该钢纤维混凝土不仅能够一级泵送到高达300m索塔上,而且该钢纤维混凝土能大幅度降低后期的干燥收缩,提高混凝土基体的抗拉强度和韧性.通过弯曲梁的抗裂性试验和索塔锚固区的足尺模型试验发现:由于钢纤维的加入,使混凝土梁的抗裂度提高了近40%;用该钢纤维混凝土浇筑的拉索锚固区,在受荷时其开裂裂缝的宽度、长度和贯穿裂缝的数目均比用对比混凝土浇筑的相应部位小得多.因此,优选出的钢纤维混凝土不仅能够满足索塔锚固区的要求,而且能够应用到其他受力复杂的区域. |
| 关键词: 钢纤维混凝土 收缩 抗裂度 抗拉强度 韧性 |
| DOI：10.11918/j.issn.0367-6234.2010.02.028 |
| 分类号:U444 |
| 基金项目:国家高技术研究发展计划重点资助项目(2008AA030704) |
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| Preparation of super-high pumping SFRC in anchorage zone between steel anchorage box and cable |
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JIANG Jin-yang, SUN Wei, ZHANG Yun-sheng, QIN Hong-gen, WANG Jing
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School of Materials Science and Engineering,Southeast University,Nanjing 210096,China
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| Abstract: |
| To ensure successful pumping and excellent crack resistance,special SFRC was prepared through optimizing the matrix,the shape and size of fibers.The pumpability,shrinkage,cracking,direct tensile strength and toughness were considered.According to the vertically pumping results,the prepared SFRC can be continuously pumped up to a concrete tower with the height over 300 m.Test results demonstrate that steel fiber can diminish the dry shrinkage of concrete in later period,and can improve the mechanical behaviors of concrete matrix.Results of cracking test indicate that the crack resistance is increased by 40% approximately due to the addition of steel fiber to concrete beam.It is also found that in the full-scale model test of main tower,the maximum crack width,cracking length and run-through crack number of anchorage zone poured by SFRC are all less than those of anchorage zone poured by contrast concrete.Therefore,the prepared SFRC is suitable for anchorage zone of the concrete tower and can be used in other zones suffering complex forces. |
| Key words: steel fiber reinforced concrete (SFRC) shrinkage crack resistance tensile strength toughness |
