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首页> 外文期刊>Iranian Journal of Science and Technology, Transactions of Civil Engineering >Determination of Sulfate Resistance of Concretes Containing Silica Fume and Fly Ash
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Determination of Sulfate Resistance of Concretes Containing Silica Fume and Fly Ash

机译：硅粉和粉煤灰混凝土抗硫酸盐性的测定

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摘要

One of the durability problems relating to reinforced concrete buildings is sulfate attack. Sulfate causes certain deteriorations like cracking, expansion and spalling through particular reactions inside concrete. As a result, degradation is observed in concrete strength. In this study, the effect of silica fume and fly ash on sulfate resistance of concrete was investigated. For this purpose, in the produced concrete, silica fume at the ratios by weight of 5%, 10% and 15% and fly ash at the ratios by weight of 10%, 20% and 30% were replaced with cement. Compressive strength, flexural strength and unit weight tests were conducted on the prepared specimens from the produced concrete after 28-, 90- and 180-day curing times. Furthermore, the prepared specimens from the produced concrete were exposed to sulfate effect after 28-day curing time in 100g/l water containing sulfate (Na2SO4) for 90days and 180days to conduct sulfate tests according to ASTM C 1012. Control specimens were compared with the specimens under sulfate attack. The best sulfate resistance performance for both compressive and flexural strengths was taken from the concretes containing 10% fly ash and 5% silica fume. Internal structure was examined through SEM images, EDS and XRD measurements in the control group and those containing mineral at a ratio of 10%. In all groups, cement type (CEM I), total binder amount (400kg/m(3)), sulfate amount (100g/l), aggregate type and its gradation were kept constant.
机译：与钢筋混凝土建筑物有关的耐久性问题之一是硫酸盐侵蚀。硫酸盐会由于混凝土内部的特定反应而引起某些劣化，如开裂，膨胀和剥落。结果，观察到混凝土强度降低。在这项研究中，研究了硅粉和粉煤灰对混凝土抗硫酸盐性的影响。为此，在所生产的混凝土中，用水泥代替水泥烟粉，其重量比为5％，10％和15％，而粉煤灰的重量比为10％，20％和30％。经过28天，90天和180天的固化时间后，对所制备混凝土的样品进行抗压强度，抗弯强度和单位重量测试。此外，由混凝土制成的标本在100 g / l含硫酸盐（Na2SO4）的水中固化28天后，要经受90天和180天的硫酸盐作用，以按照ASTM C 1012进行硫酸盐测试。标本受到硫酸盐侵蚀。从包含10％粉煤灰和5％硅粉的混凝土中获得了抗压强度和抗弯强度最佳的抗硫酸盐性能。通过SEM图像，EDS和XRD测量对对照组以及含有10％比率的矿物质的内部结构进行检查。在所有组中，水泥类型（CEM I），总粘结剂量（400kg / m（3）），硫酸盐量（100g / l），集料类型及其等级保持恒定。

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