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摘要

Cement blends incorporating at least 5 and up to 40 % siliceous crop residue ash and cement compositions and products containing said blends are provided. At least about 50 % of the ash particles are in the 10-75 micrometer size distribution range and the mean diameter is greater than 6 micrometers. Methods for decreasing the permeability of hardened cement products and a method for accelerating the early strength of a concrete mixture containing fly ash are also provided.