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PCA ? -III is based on comb polymer technology and is a generation of admixture that is specially formulated for slump retention. Along with polycarboxylate superplasticizer added into concrete, PCA ? -III has been created to produce superior slump retention. PCA ? -III contains no formaldehyde, calcium chloride or other purposely added chlorides, and will not initiate or encourage the corrosion of the steel present in the concrete. PCA ? -III is formulated to comply with the subsequent specifications for concrete admixture: ASTM494, Type F; BS EN934:2/3.2.3.