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Alkali-Aggregate Reactions in Hydroelectric Plants and Dams Hatch Energy is the world leader in the analysis and remediation of hydraulic facilities affected by AAR. Using Grow3D, a proprietary finite element program developed at Hatch Energy predecessor company, Acres, we have analyzed and assessed more AAR-affected hydraulic structures than any other engineering consulting firm in the world. What is AAR? AAR is a chemical reaction within hardened concrete, which causes it to expand over time. The reaction can continue indefinitely if sufficient alkalis are available to sustain the reaction. The hydroxyl ions of the concrete pore solution (which is highly basic) react with the alkaline and certain mineral phases in the concrete coarse and fine aggregate. The expansion causes cracking in the cement paste and aggregates which adversely affects the mechanical properties of the material. Conditions required for AAR are:
Our Unique Experience: Hatch Energy has assessed numerous AAR-affected mass concrete hydraulic structures including:
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AAR Databases |
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