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首页> 外文会议>Transportation Research Board Annual meeting >Effect of Accelerated Curing on Surface Resistivity and Rapid Chloride e Permeability of High Performance Concrete
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Effect of Accelerated Curing on Surface Resistivity and Rapid Chloride e Permeability of High Performance Concrete

机译：加速养护对高性能混凝土表面电阻率和氯离子渗透率的影响

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Recently, many bridges were built using High Performance Concrete (HPC) to increase theirdurability. However, when subjected to cracking or exposed to aggressive environments, theirdurability would gradually diminish, causing corrosion of reinforcement in the deck. Thisphenomenon is one of the major factors causing delamination and structural deficiencies ofconcrete decks. The corrosion risk is directly related to the chloride ion permeability of theconcrete, which can be determined using permeability testing at a minimum of 56 days. Sincethe permeability testing is time consuming and labor–intensive, many of State Department ofTransportations (DOT’s) are exploring the use of more expedient and less variable testingmethods. To evaluate the long-term durability aspects of HPC at an earlier acceptance age butwith lower cost, accelerated curing and concrete resistivity measurement are proposed as apotential replacement. There is a need to understand the effect of accelerated curing on concreteresistivity and chloride ion permeability as a measure of durability.This paper conducts an experimental program to evaluate the effects of accelerated curingon durability performance of HPC. Both the Surface Resistivity (SR) and the Rapid ChloridePermeability (RCP) tests were performed on concrete cylinders cured under accelerated as wellas normal wet curing conditions. Results show that RCP testing can be substituted by SR testingas a measure of the durability of concrete. Moreover, accelerated curing can expedite the timeneeded to test permeability. Additionally, SR testing combined with accelerated curingcorrelated well with results from RCP testing.
机译：最近，许多桥梁是使用高性能混凝土（HPC）建造的，以增加其强度。 耐用性。但是，当遭受破裂或暴露在侵蚀性环境中时，它们的 耐用性将逐渐降低，从而导致甲板中钢筋的腐蚀。这 现象是导致分层和结构缺陷的主要因素之一。 混凝土甲板。腐蚀风险直接关系到氯离子的渗透性。 混凝土，可以使用至少56天的渗透性测试来确定。自从 渗透率测试既费时又费力，许多国务院 运输部门（DOT）正在探索使用更便捷，变化更少的测试 方法。评估HPC在较早的接受年龄时的长期耐久性方面，但是 作为低成本的方法，提出了加速固化和混凝土电阻率测量的方法。 潜在的替代品。有必要了解加速固化对混凝土的影响 电阻率和氯离子渗透率作为耐久性的量度。 本文进行了一个实验程序，以评估加速固化的效果 HPC的耐用性。表面电阻率（SR）和快速氯化物 还对在加速条件下固化的混凝土圆柱体进行了渗透性（RCP）测试 作为正常的湿固化条件。结果表明，RCP测试可以被SR测试取代 作为衡量混凝土耐久性的指标。而且，加速固化可以缩短时间 需要测试渗透率。此外，SR测试与加速固化相结合 与RCP测试的结果很好地相关。

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