Abstract
Studies have been made of dissolution kinetics of Portland cement concrete from a masonry dam in service since 1886. Finely ground samples washed free of excess lime and alkalis were used to measure rates of release of calcium and silica into water having a pH of 5·7 and low total hardness. A dissolution rate constant for a second-order process of between 1·0 × kg−6 m4 s−1 and 1·6 × kg−1 m4 S−1 was determined at 21°C. Preliminary results suggest that it is feasible to use quantitative methods of designing hydraulic concrete structures against deterioration by aggressive water, Previously described design procedures to accommodate soluble minerals in foundations of hydraulic structures, may also be used for concrete, mortars and grouts in aggressive environments. The preliminary data need to be extended to validate the proposal, and recommendations are made for that purpose.
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