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Laboratory investigations carried out at the University of California Engineering Materials Laboratory on concretes containing the two most common types of water-reducers and retarders show that their effectiveness is greatly influenced by the composition of the portland cement.
The effects of three lignin type and of one organic acid type water reducers on properties of fresh concretes and compressive strength of concretes made with four different California portland cements is evaluated. In a second program, a second organic acid type water reducer was used in concretes made with some twenty American cements; compressive strengths of concretes containing these various cements are reported.
Also presented are data demonstrating the effect of water reducers and retarders on the early-age heat of hydration of different cements.
Associate Professor of Civil Engineering, University of California, Berkeley, Calif.
Research Kngineer and Lecturer in Civil Kngineering, University of California, Berkeley, Calif.