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首页> 外文会议>Fifth ACI International Conference on Innovations in Design with Emphasis on Seismic, Wind, and Environmental Loading; Quality Control and Innovations in Materials/Hot-Weather Concreting Dec, 2002 Cancun, Mexico >Effect of Reinforcing Bar Contamination on Steel-Concrete Bond During Concrete Construction
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Effect of Reinforcing Bar Contamination on Steel-Concrete Bond During Concrete Construction

机译：混凝土施工过程中钢筋污染对钢筋混凝土粘结的影响

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During concrete construction, form oil, bond breaker, concrete splatter and other types of contaminants often contaminate reinforcement. Current specifications and quality control measures require the removal and clean up of these contaminants before the placement of concrete due to a concern of a reduction in bonding capacity. This is costly, labor intensive, and may not be necessary. Currently, there is limited research on the effect of reinforcing bar contamination on the bond between the deformed steel reinforcing bar and concrete. Because of this lack of data, specifications are conservative and require the removal of the contaminant. Inspectors often cite ACI 301-96, Standard Specifications for Structural Concrete, which states, "When concrete is placed, all reinforcement shall be free of materials deleterious to bond." If it could be conclusively proven that this level of care is unnecessary, the construction industry would benefit greatly. To address the effects of contaminants on bond characteristics of deformed steel reinforcing bars, a preliminary study was completed at the University of Mis-souri-Rolla. The research program focused on three contaminants often seen during construction: form oil, bond breaker and concrete splatter. Other variables included size of reinforcing bar, strength of concrete and epoxy versus uncoated reinforcing bar. This paper will provide the experimental program and test procedures as well as the test results and observations. The results reveal that in the majority of situations tested, the ultimate bond stress was not significantly affected by the three contaminants tested. In some cases, the bond breaker and form oil affected the smaller epoxy coated bars, while the effect of concrete splatter was insignificant.
机译：在混凝土施工期间，模板油，粘结破坏剂，混凝土飞溅物和其他类型的污染物经常污染钢筋。当前的规范和质量控制措施由于担心粘结能力的降低，要求在混凝土浇筑之前去除并清除这些污染物。这是昂贵的，劳动密集的，并且可能不是必需的。当前，关于钢筋污染对变形的钢筋与混凝土之间的粘结的影响的研究很少。由于缺少数据，规格比较保守，需要去除污染物。检查人员经常引用ACI 301-96，《结构混凝土标准规范》，其中指出：“放置混凝土时，所有钢筋应不含有害粘结的材料。”如果可以最终证明不需要这种级别的照料，那么建筑行业将受益匪浅。为了解决污染物对变形钢筋的粘结特性的影响，Mis-souri-Rolla大学完成了一项初步研究。该研究计划的重点是在施工过程中经常见到的三种污染物：模板油，粘结破坏剂和混凝土飞溅物。其他变量包括钢筋的尺寸，混凝土和环氧树脂的强度与未涂覆的钢筋的比。本文将提供实验程序和测试程序，以及测试结果和观察结果。结果表明，在大多数测试情况下，三种测试污染物均不会显着影响最终的粘结应力。在某些情况下，破胶剂和成型油会影响较小的环氧涂层胶条，而混凝土飞溅的影响则微不足道。

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