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THE SPLITTING TENSILE BEHAVIOR OF THE BONDING INTERFACE BETWEEN FRESH STEEL FIBER CONCRETE AND OLD CONCRETE UNDER FREEZE-THAW
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摘要: 通过对105块100mm100mm100mm钢纤维混凝土与老混凝土立方体粘结试块快速冻融后的劈拉试验,探讨冻融循环次数、钢纤维体积率等因素对新老混凝土粘结性能的影响。结果表明,钢纤维混凝土与老混凝土粘结劈拉强度随冻融次数增加而下降、随钢纤维体积率的增加有一定程度提高。最后,建立了考虑老混凝土劈拉强度、冻融循环次数和钢纤维体积率影响的钢纤维混凝土与普通老混凝土粘结劈拉强度的计算模式。Abstract: By the splitting tensile strength experiments on the specimens with the dimension of 100mm @ 100mm @ 100mm, it is explored that the influence of the number of freeze-thaw cycle and steel fiber volume fraction upon the splitting tensile behavior of the bonding interface between fresh steel fiber concrete and old concrete through quickly freeze-thaw testing. The result demonstrates that the splitting tensile strength of the bonding specimen declines with the escalating of the freeze-thaw cycle. s number and the strength aggrandizes a certain extent with the increasing of the steel fiber volume fraction. At last, the calculating formula of the splitting tensile strength of the bonding interface is established, which considers the influence of old concrete. s splitting tensile strength, number of freeze-thaw cycle and steel fiber volume fraction.
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[2] 陈国文.钢纤维混凝土修补技术.施工技术,2004(1):31-33 赵志方,赵国藩,刘健等.新老混凝土粘结的抗拉强度试验研究.建筑结构学报,2001,22(2):51-56 [3] 高丹盈,刘建秀.钢纤维混凝土基本理论.北京:科学技术文献出版社,1994 [4] 赵国藩,赵志方,袁群,等.新老混凝土粘结机理和测试方法研究PP国家基础性研究重大项目(攀登计划B)之5.2(1)课题年度总结报告.大连:大连理工大学, 1997 [5] CECS25B90 混凝土结构加固技术规范 [6] 李平先,赵国藩,张雷顺.环氧砂改善新老混凝土粘结强度试验研究.大连理工大学学报,2005,45(2):254-259 [7] Li Gengying, Xie Huicai, Xiong Guangjing. Transition Zone Studies ofNew-to-Old Concrete with Different Binders. Cement and Concret e Composites, 2001,23(4-5):381-387 [8] DLPT 5150-2001水工混凝土试验规程 [9] 高丹盈,程红强.冻融循环对新老混凝土粘结性能的影响.混凝土,2006(3):29-32 [10] 谢慧才,申豫斌.碳纤维混凝土对新老混凝土粘结性能的改善.土木工程学报,2003,36(10):15-18 -
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