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The strength accelerating effect of a chloride-free admixture is investigated with two types of commercially available portland cements, each with two different fly ashes. The accelerator is a water-soluble organic material belonging to the carboxylic acid group. The results show that considerable strength increases are produced by the use of this accelerator. For instance, specimens in which 25 and 30% of the portland cement was substituted by fly ash reached or approached the 28-day strength of the control specimens without fly ash but at the same water-cement ratio.
Professor, Drexel University, Philadelphia, PA
Stock #: CCA10044J