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The rates at which aggregates approach their 24-h water absorption values have been measured for a variety of aggregates. The aggregates varied widely in both their total pore volume and median pore size. The rates of water uptake were found to vary greatly, with some aggregates taking in about 90% of their 24-h uptake within the first minute and others taking in only about 20%. Larger pore sizes and pore volumes seem to promote faster rates. It was found that aggregates with a rapid uptake would have given erroneous Iowa Pore Index test results. It was also found that there was no correlation between an aggregate's early rate of absorption and its freeze/thaw durability.
Associate professor, School of Civil Engineering, Prudue University, W. Lafayette, IN
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