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首页> 外文会议>International Center for Aggregates Research 5th Annual Symposium Proceedings; Apr 21-23, 1997; Austin, TX >HOW TO AVOID EXCESSIVE EXPANSION OF CONCRETE DUE TO ALKALI-AGGREGATE REACTION
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HOW TO AVOID EXCESSIVE EXPANSION OF CONCRETE DUE TO ALKALI-AGGREGATE REACTION

机译：由于碱-骨料反应，如何避免混凝土过度膨胀

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摘要

Excessive expansion of concrete due to alkali-aggregate reaction (AAR) will not occur if any one of the following circumstances exists: (a) The aggregate is insufficiently reactive, (b) The pH of the pore fluid is not too high, (c) The amount of reaction product formed is not sufficiently large or not sufficiently expansive so that its expansion can cause damage, (d) There is not enough available water to cause the reaction to progress so as to develop the expansive product and to be available for imbibition by the product so as to cause it to swell and disrupt the concrete. Put the other way around, excessive expansion can occur only if there is enough potentially expansive AAR reaction product and water so that, as the product takes up the water and swells, the concrete expands excessively. Hence, what is needed to avoid excessive expansion is to be able to predict the probable reactivity of the available aggregates, the probable mechanisms by which the pH of the pore fluid might get well above the normal 12.6 or so, and, when justified, select and implement appropriate precautions against these eventualities.
机译：如果存在以下任何一种情况，则不会发生因碱骨料反应（AAR）引起的混凝土过度膨胀：（a）骨料反应性不足，（b）孔隙液的pH值不太高，（c ）生成的反应产物的量不够大或膨胀不足，以至于其膨胀会导致损坏;（d）没有足够的可用水来促使反应进行，从而形成膨胀产物并且可用于产品吸水，使其膨胀并破坏混凝土。换句话说，仅当有足够的潜在膨胀的AAR反应产物和水时，才会发生过度膨胀，这样，随着产物吸收水并溶胀，混凝土会过度膨胀。因此，需要避免过度膨胀的是能够预测可用聚集体的可能的反应性，孔隙流体的pH值可能远高于正常值12.6左右的可能机理，并在合理的情况下选择并采取适当的预防措施以应对这些情况。

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