The AAR reaction in concrete dams

机译：混凝土大坝中的AAR反应

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A characteristic 'map cracking' pattern has been observed in an increasing number of old structures. This long term (20 years) deterioration is due to the alkali aggregate reaction (AAR) in concrete between active silica often present in aggregate, alkalis present in cement, and water. This leads to the formation of a gel and the consequent expansion causes cracking and thus weakening of concrete. Reductions of up to 50% in the tensile strength and 60% in elastic modulus have been detected. This process is of general concern throughout the concrete construction industry but the present work is directed towards the application to dams.

机译：在越来越多的旧结构中已经观察到了特征性的“地图开裂”模式。这种长期（20年）的劣化是由于混凝土中经常存在的活性二氧化硅，水泥中存在的碱与水之间的混凝土中的碱骨料反应（AAR）引起的。这导致形成凝胶，并且随之而来的膨胀导致开裂，从而削弱混凝土。已检测到拉伸强度降低了50％，弹性模量降低了60％。这个过程是整个混凝土建筑行业普遍关心的问题，但是目前的工作是针对大坝的应用。

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《International Conference on Structural Integrity and Fracture, SIF 2002, Sep 25-27, 2002, Perth, Australia》|2002年|p.309-313|共5页
会议地点 Perth(AU);Perth(AU)
作者
N. Fowkes; C.A. Pina; J.P. Gomes; R.J. Camara;
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作者单位

Maths Department, University of WA, Perth, Australia;

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原文格式 PDF
正文语种 eng
中图分类一般工业技术;
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1. Modeling Stress-Strain Behavior of Concrete Damaged by Alkali-Aggregate Reaction (AAR) [J] . S.J. Pantazopoulou, M.D.A. Thomas ACI Structural Journal . 1999,第5期

机译：碱-骨料反应（AAR）损伤混凝土的应力-应变行为建模
2. An attempt to validate the ultra-accelerated microbar and the concrete performance test with the degree of AAR-induced damage observed in concrete structures [J] . Andreas Leemann, Christine Merz Cement and Concrete Research . 2013,第Null期

机译：尝试通过在混凝土结构中观察到的AAR引起的破坏程度来验证超加速微棒和混凝土性能测试
3. Overall assessment of Alkali-Aggregate Reaction (AAR) in concretes presenting different strengths and incorporating a wide range of reactive aggregate types and natures [J] . Sanchez L. F. M., Fournier B., Jolin M., Cement and Concrete Research . 2017,第期

机译：碱聚集反应（AAR）在呈递不同强度的混凝土中的总体评估，并掺入各种反应性聚集系类型和自适应
4. Stator Frame Distortion: Living with Alkaline Aggregate Reaction (AAR) on the Concrete Structures of Hydro-electric Dams; A Case Study of at Kpong Hydroelectric Station, Ghana [C] . World Engineers' Convention 2004 vol G: Ecological Material and Green Manufacturing; 20041102-06; Shanghai(CN) . 2004

机译：定子框架变形：在水电大坝混凝土结构上发生碱性聚集反应（AAR）；加纳Kpong水电站的案例研究
5. Identifying Damage, Predicting Expansion, and Determining the Effectiveness of Sealers on Concrete Affected by Alkali-Silica Reaction and Freeze-Thaw. [D] . Waidner, Matthew. 2016

机译：确定受碱-硅石反应和冻融影响的混凝土上的损伤，预测膨胀并确定密封剂的有效性。
6. Interpretation of Impact-Echo Testing Data from a Fire-Damaged Reinforced Concrete Slab Using a Discrete Layered Concrete Damage Model [O] . Changkye Lee, Seong-Hoon Kee, Jun Won Kang, 2020

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机译：使用加速巴西混凝土棱柱试验（aBCpT）评估碱骨料反应（aaR）

The AAR reaction in concrete dams

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