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首页> 外文期刊>Magazine of Concrete Research >Fly ash from modern coal-fired power technologies: chloride ingress and carbonation of concrete
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Fly ash from modern coal-fired power technologies: chloride ingress and carbonation of concrete

机译：现代燃煤发电技术产生的粉煤灰：混凝土的氯化物浸入和碳化

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Low-lime fly ashes produced from modern coal-fired power technologies (developed to enhance efficiency/lower emissions), including nitrogen oxide (NOx) reduction, co-combustion, supercritical steam and oxy-fuel combustion, and their effects on chloride ingress and carbonation of concrete are investigated in this paper. Earlier work indicates that some of these technologies influence fly ash properties, but they mainly follow typical behaviour found for the material (consistence and compressive strength) in concrete. Both accelerated and normal-type exposure tests were carried out on a range of practical water/cement ratio concretes (also enabling interpolation for comparisons at equal 28 d strength). The test fly ash concretes were evaluated against (i) those containing three reference fly ashes covering a range of fineness and (ii) corresponding studies on fly ash concretes from the 1990s. The results show that there was an influence of fly ash fineness, reflected in reactivity/porosity (measured on mortar), and aspects of chemistry on chloride ingress, but there appeared to be minor material effects on carbonation. Comparison with the 1990s data indicated similar behaviour for the materials between studies for both properties. A relationship was also identified for the product of reactive alumina and sub-10 mu m contents of the modern fly ashes and chloride resistance of concrete.
机译：由现代燃煤发电技术（旨在提高效率/降低排放量）产生的低灰粉煤灰，包括减少氮氧化物，共燃烧，超临界蒸汽和含氧燃料燃烧，以及它们对氯化物进入和燃烧的影响本文研究了混凝土的碳化。早期的工作表明，其中一些技术会影响粉煤灰的性能，但它们主要遵循针对混凝土中材料的典型行为（稠度和抗压强度）。加速型和普通型暴露测试均在一系列实用的水灰比混凝土上进行（还可以进行插值，以便在28 d强度下进行比较）。用（i）包含三种粉煤灰覆盖范围细度的那些粉煤灰和（ii）1990年代以来对粉煤灰混凝土的相应研究对测试的粉煤灰混凝土进行了评估。结果表明，粉煤灰细度的影响反映在反应性/孔隙度（在砂浆上测量）以及化学方面对氯化物的浸入，但似乎对碳酸盐化影响不大。与1990年代的数据比较表明，两种性质的研究之间材料的行为相似。还确定了活性氧化铝的产品与现代粉煤灰的10微米以下含量和混凝土的耐氯化物之间的关系。

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