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首页> 美国卫生研究院文献>Materials >Influence of Blended Cements with Calcareous Fly Ash on Chloride Ion Migration and Carbonation Resistance of Concrete for Durable Structures
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Influence of Blended Cements with Calcareous Fly Ash on Chloride Ion Migration and Carbonation Resistance of Concrete for Durable Structures

机译：水泥与石灰性粉煤灰混合对耐久性结构混凝土氯离子迁移和抗碳化性的影响

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摘要

The objective of this paper is to examine the possible use of new blended cements containing calcareous fly ash in structural concrete, potentially adequate for structural elements of nuclear power plants. The investigation included five new cements made with different contents of non-clinker constituents: calcareous fly ash, siliceous fly ash, ground granulated blastfurnace slag, and a reference cement—ordinary Portland cement. The influence of innovative cements on the resistance of concrete to chloride and carbonation exposure was studied. Additionally, an evaluation of the microstructure was performed using optical microscopy on concrete thin sections. Test results revealed a substantial improvement of the resistance to chloride ion penetration into concrete containing blended cements. The resistance was higher for increased clinker replacement levels and increased with curing time. However, concrete made with blended cements exhibited higher depth of carbonation than the Portland cement concrete, except the Portland-fly ash cement with 14.3% of calcareous fly ash. The thin sections analysis confirmed the values of the carbonation depth obtained from the phenolphthalein test. Test results indicate the possible range of application for new cements containing calcareous fly ash.
机译：本文的目的是研究在结构混凝土中含有钙质粉煤灰的新型掺合水泥的可能用途，这些水泥可能足以满足核电厂的结构要素。调查包括五种新水泥，这些水泥由不同含量的非熟料成分制成：钙质粉煤灰，硅质粉煤灰，粒状高炉矿渣粉和参考水泥（普通硅酸盐水泥）。研究了新型水泥对混凝土抗氯化物和碳化作用的影响。另外，使用光学显微镜对混凝土薄片进行了显微组织的评估。测试结果表明，氯离子渗透到掺混水泥中的抵抗力有了实质性的提高。对于增加的熟料替换水平，电阻更高，并且随着固化时间的增加而增加。然而，除了含钙粉煤灰为14.3％的硅酸盐粉煤灰水泥外，掺混水泥制成的混凝土的碳化深度比硅酸盐水泥混凝土高。薄切片分析证实了从酚酞试验获得的碳酸化深度的值。测试结果表明，含钙质粉煤灰的新型水泥的应用范围可能很大。

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