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Durability properties of concrete containing metakaolin

机译：含偏高岭土的混凝土的耐久性能

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摘要

The main aim of this study is to investigate the possible effects of metakaolin on strength and durability properties of concrete. For this purpose, concrete mixtures are produced by substituting cement with metakaolin 0, 5, 10 and 20% by weight. The amount of binder for the concrete mixtures are 300 and 400 kg/m~3 with a constant water to cement ratio of 0.6. Compressive and bending strengths, freeze-thaw and high-temperature resistances, capillary coefficients and rapid chloride permeability properties were determined and compared each other. Because of all the experiments conducted, it has been found that the use of metakaolin as a pozzolanic additive in concrete have positive effects especially on compressive and bending strengths, capillary, rapid chloride permeability, freeze-thaw resistance, and high temperatures, up to 800°C. The results indicated that the performance of concrete can be enhanced by metakaolin. Particularly, compressive strength and durability properties have found to be improved with increasing metakaolin content which is attributed to pozzolanic activity and filler effect. Furthermore, metakaolin has relatively positive impacts under elevated temperatures and freeze-thaw effects. However, almost all the strengths of entire concrete specimens are lost at 800°C. Consequently, the optimum metakaolin substitution ratio can be suggested to be 20% as per this study.
机译：这项研究的主要目的是研究偏高岭土对混凝土强度和耐久性能的可能影响。为此目的，通过用0、5、10和20重量％的偏高岭土代替水泥来生产混凝土混合物。用于混凝土混合物的粘合剂的量为300和400kg / m 3，水与水泥的恒定比为0.6。确定并比较了抗压强度和弯曲强度，抗冻融和高温性能，毛细系数和快速的氯离子渗透性。由于进行了所有实验，因此发现在混凝土中使用偏高岭土作为火山灰添加剂具有积极的作用，特别是对抗压强度和弯曲强度，毛细作用，快速的氯化物渗透性，耐冻融性以及高达800的高温℃。结果表明，偏高岭土可以提高混凝土的性能。特别地，已经发现，由于火山灰活性和填料作用，随着偏高岭土含量的增加，抗压强度和耐久性能得到改善。此外，偏高岭土在升高的温度和冻融作用下具有相对积极的影响。但是，整个混凝土试样的几乎所有强度在800°C时都会丧失。因此，根据这项研究，最适偏高岭土的替代比例可以建议为20％。

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