Preliminary Study of the Effects of Water-Reducing Retarders on the Strength, Air Void Characteristics, and Durability of Concrete
Thomas D. Larson, John L. Mangusi an dRaymond R. Radomski
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Concretes made with water-reducing retarders showed improved freeze-thaw durability, primarily as a result of increased strength. Specimens made from constant slump, constant cement factor mixtures containing several agents at various dosage levels had higher flexural and comressive strengths than control speciments strengths at 7 and Q8 days correlated significantly with durability factor. Microscopic studies indicated that there were minor differences between the air void systems of control and test concretes. In particular, spacing factors increased with retardation. This appeared to result from. ajr.entrainment by the water-reducing retarders and from bubble dissolution.