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首页> 外文会议>International Conference on Concrete for Extreme Conditions >ACCELERATED SCREENING TESTS FOR ALKALI AGGREGATE REACTIONS IN HONG KONG
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ACCELERATED SCREENING TESTS FOR ALKALI AGGREGATE REACTIONS IN HONG KONG

机译：在香港进行的碱性聚集反应的加速筛选测试

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摘要

Some 50% of the aggregates used for construction in Hong Kong are imported, mostly from nearby quarries in Mainland China. While local aggregates produced from granite are generally regarded as non-reactive with respect to alkali aggregate reaction (AAR), less can be said about imported aggregates. Structures suffering from the effects of AAR have been reported, investigated and confirmed by the Public Works Central Laboratory (PWCL). Accelerated mortar bar test (AMBT) methods were used at the PWCL for testing the alkaline aggregate reactivity of aggregates, including imported aggregates and recycled aggregates. The results of these tests using four different AMBT methods, originated from Hong Kong, the US, Canada and Europe, are presented and discussed in this paper. This paper also describes a study which compares the results of AMBT using high alkaline cement in forming the mortar bars with those using low alkaline cement but with sodium hydroxide or sodium chloride added. The International Union of Testing and Research Laboratories for Materials and Structures (RILEM) method was used for the AMBT. The differences in the results are highlighted and discussed. The study also investigated the role of alkaline in the cement, and of the sodium ions and hydroxide ions added to the mortar mix during the AMBT in the development of AAR.
机译：香港用于建筑业的骨料中约有50％是进口的，大部分是从中国大陆附近的采石场进口的。虽然一般认为由花岗岩生产的局部骨料相对于碱骨料反应（AAR）不具有反应性，但对于进口骨料而言却少之又少。受公共工程中心实验室（PWCL）的报道，调查和确认，遭受AAR影响的结构。 PWCL使用加速砂浆棒试验（AMBT）方法来测试骨料的碱性骨料反应性，包括进口骨料和再生骨料。本文介绍并讨论了使用来自香港，美国，加拿大和欧洲的四种不同AMBT方法的测试结果。本文还描述了一项研究，该研究将使用高碱性水泥形成砂浆棒的AMBT与使用低碱性水泥但添加氢氧化钠或氯化钠的砂浆棒的结果进行了比较。 AMBT使用了国际材料与结构测试与研究实验室联盟（RILEM）方法。结果的差异将突出显示和讨论。该研究还研究了碱在水泥中的作用，以及AMBT在AAR开发过程中向砂浆混合物中添加的钠离子和氢氧根离子的作用。

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