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首页> 外文会议>Canadian Dam Association 3rd Annual Conference, Sep, 2000, Regina, Saskatchewan >Mass Concrete Swelling
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Mass Concrete Swelling

机译：大体积混凝土膨胀

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This paper presents a classification of mass concrete swelling mechanisms. While among practising engineers, concrete swelling and alkali-aggregate reactions (AAR) are very often mistaken one for the other, it appears that AAR is just a particular case of swelling. Usual structures exposed to climatic conditions may exhibit a concrete swelling phenomenon, but the real mechanism, being generally superposed to other destructive phenomena like salt exposure, steel corrosion, freezing-thawing and wetting-drying cycles, is not clearly identified. Due to an accelerated deterioration, long term measurements are not always possible; however mass concrete hydraulic structures, despite having their skin concrete damaged, will show, even after 60 years, their internal swelling core almost intact. No simple explanation is available to justify all the different observed behaviour. An attempt is made to classify the swelling mechanisms into four types: "Chemical swelling", "Hydraulic swelling", "Mechanical swelling" and "Hydrothermal Creep swelling". However, concrete swelling is, in most cases, the consequence of all four above contributions. Considering the case of Beauharnois G. S. as typical, the author proposes the physico-chemical mechanism termed "Hydrothermal Creep" as the best explanation for concrete swelling, based on macroscopic observations (Lupien 1997). This new explanation borrows its basic concepts (saturation, thermal effects, pore pressures, deferred hydration and creep) to the three other swelling models.
机译：本文提出了大体积混凝土膨胀机理的分类。尽管在实际工程师中，混凝土溶胀和碱集料反应（AAR）经常被误认为是另一种溶胀，但似乎AAR只是溶胀的一种特殊情况。暴露于气候条件下的通常结构可能会表现出具体的膨胀现象，但目前尚不清楚确切的机理通常与其他破坏性现象（如盐分暴露，钢腐蚀，冻融和干湿循环）叠加在一起。由于加速恶化，长期测量并不总是可行的。然而，尽管混凝土混凝土表皮受损，但大体积的水工结构即使在60年后仍会显示其内部膨胀核心几乎完整无缺。没有简单的解释可以证明所有不同的观察到的行为都是合理的。试图将溶胀机理分为四种类型：“化学溶胀”，“液压溶胀”，“机械溶胀”和“水热蠕变溶胀”。但是，在大多数情况下，混凝土膨胀是上述所有四个因素的结果。考虑到典型的Beauharnois G. S.的情况，作者根据宏观观察结果提出了被称为“水热蠕变”的物理化学机制，作为混凝土溶胀的最佳解释（Lupien 1997）。这个新的解释借鉴了其他三个溶胀模型的基本概念（饱和度，热效应，孔隙压力，延迟水合作用和蠕变）。

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