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首页> 外文期刊>Cermica >The influence of cement type and admixture on life span of reinforced concrete utility poles subjected to the high salinity environment of Northeastern Brazil, studied by corrosion potential testing
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The influence of cement type and admixture on life span of reinforced concrete utility poles subjected to the high salinity environment of Northeastern Brazil, studied by corrosion potential testing

机译：通过腐蚀电位测试研究了水泥类型和外加剂对巴西东北高盐度环境下钢筋混凝土电线杆寿命的影响

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Reinforced concrete structures installed in coastal zones have constantly been threatened by environmental damaging elements. The chloride ion is known as one of the most aggressive of these elements, causing, among other damages, corrosion of the steel reinforcement and then degradation of the concrete matrix. The goal of this work was to determine the influence of cement type on the resistance and durability of reinforced concrete samples with 25 mm cover thickness, when submitted to aging in a 3.4% sodium chloride aqueous solution and in a high salinity marine environment. Reinforced concrete light poles were cast following the same batching procedures, and after the curing period, they were exposed to atmosphere in a corrosion station near Aracaju, Sergipe State, Northeastern Brazil's coast. Two concrete mixtures were made using CPII-F 32 (filler-modified Portland cement): a mix with no admixture and a mix with addition of 8% silica fume swapping fine aggregates. Another mixture was batched with CPV-ARI RS (high-early-strength Portland cement, with sulfur resistance). All the three mixtures were designed with cement content of about 350 kg/m3. The performance of the structures was evaluated from the results of physicochemical, mechanical and electrochemical testing, after over a year of natural aging. Corrosion potentials of the reinforced concrete samples and of the cast utility poles were measured in terms of the aging time at the natural environment and under chloride ion accelerated aging at laboratory. The half-cell potential measurements showed that the best results were obtained from the mixture containing CPII-F 32 cement and silica fume, followed by the concrete made with CPV-ARI RS cement. The mixture batched with CPII-F 32 cement without admixture presented the worst durability performance.
机译：安装在沿海地区的钢筋混凝土结构一直受到环境破坏因素的威胁。氯离子被认为是这些元素中最具侵蚀性的元素之一，除其他损害外，还会引起钢筋的腐蚀，然后导致混凝土基质的降解。这项工作的目的是确定水泥类型对在3.4％氯化钠水溶液中和高盐度海洋环境中老化的25 mm覆盖厚度的钢筋混凝土样品的抗性和耐久性的影响。按照相同的分批程序浇铸钢筋混凝土灯柱，固化后，将其暴露在巴西东北海岸塞尔吉皮州阿拉卡茹附近的腐蚀站内的大气中。使用CPII-F 32（填料改性的波特兰水泥）制备了两种混凝土混合物：无掺合料的混合物和添加8％硅粉的混合物，以交换细骨料。将另一种混合物与CPV-ARI RS（具有抗硫性的高强度波特兰水泥）分批加入。设计的所有三种混合物的水泥含量约为350 kg / m3。经过一年多的自然老化后，根据理化，机械和电化学测试的结果评估了结构的性能。根据自然环境中的老化时间和实验室中氯离子加速老化的条件，测量了钢筋混凝土样品和浇铸电线杆的腐蚀电位。半电池电位测量表明，从包含CPII-F 32水泥和硅粉的混合物中获得最佳结果，然后是使用CPV-ARI RS水泥制成的混凝土。未掺加CPII-F 32水泥的混合物表现出最差的耐久性能。

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