| 摘要: |
| 为减小冻融循环对再生混凝土力学性能的影响，提高严寒地区再生混凝土的耐久性能，系统研究了冻融循环作用下再生粗骨料替代率、冻融碳纤维布（CFRP）加固作用顺序对再生混凝土短柱试件承载能力的影响.结果表明：冻融循环作用使再生混凝土短柱试件极限承载力大幅降低，CFRP加固可以使再生粗骨料替代率为0％，50％和100％的再生混凝土短柱试件极限承载力分别提高到冻融前试件极限承载力的1514，1502和2088倍，CFRP加固不仅可以大幅提高再生混凝土的抗冻融损伤性能，还可以有效修复、弥补冻融损伤再生混凝土的承载能力；先CFRP加固后冻融试件的承载能力优于先冻融后CFRP加固试件.用CFRP加固混凝土短柱的环箍力轴向应变关系、混凝土单轴受压主动侧限本构关系和CFRP加固下的混凝土被动侧限本构关系建立了适用于冻融循环与CFRP加固共同影响下的再生混凝土短柱试件极限承载力公式. |
| 关键词: 再生混凝土 冻融循环 CFRP加固 力学性能 |
| DOI：103969/j.issn.1007 9629201903018 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51408382）；教育部创新团队项目（IRT_14R37）；成都大学青年基金资助项目（2018XZB19） |
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| Effects of CFRP Reinforcement on Loading Capacity of Recycled Concrete Column under Cycled Freeze Thaw Environment |
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HE Yuanyuan1, WU Li2, DONG Jiangfeng3, WANG Qingyuan1
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1.Institute of New Energy and LowCarbon Technology, Sichuan University, Chengdu 610065, China;2.Shanxi Electric Power Company, State Grid, Taiyuan 030006, China;3.Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China
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| Abstract: |
| In order to ameliorate the durability of recycled concrete at cold regions, the effects of the replacement rate of recycled concrete and sequence of carbon fiber reinforced polymer(CFRP) reinforcement on the loading capacity of recycled concrete columns under freeze thaw cycled environment were systematically investigated. The experimental result shows that the ultimate bearing capacity of recycled concrete without CFRP reinforcement is significantly reduced by freeze thaw cycle. However, surprisingly, the postmortem CFRP reinforcement with 0％, 50％and 100％ recycled concrete can improve the ultimate bearing capacity of freeze thaw cycled samples to levels of about 1514, 1502 and 2088 times higher than that of the corresponding samples not suffered freeze thaw cycle, respectively. These indicate that CFRP reinforcement is an effective way in recuperating the load bearing capacity and optimizing the damage resistance of recycled concrete under freeze thaw cycled environment. In addition, the pre reinforced columns after freeze thaw cycle still exhibit higher ultimate bearing capacity than that of the original samples without reinforcement. Basing on both the axial compression constitutive model and the relationship between radial force and axial strain, a new load bearing formula is deduced for recycled concrete column under the influence of both CFRP reinforcement and freeze thaw cycle. |
| Key words: recycled concrete freeze thaw cycle CFRP reinforcement mechanical property |
