Superplasticizers and Air Entraining Agents: State of the Art and Future Needs


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Title: Superplasticizers and Air Entraining Agents: State of the Art and Future Needs

Author(s): M. Collepardi

Publication: Special Publication

Volume: 144


Appears on pages(s): 399-416

Keywords: air-entraining agents; creep properties; durability; freeze-thaw durability; shrinkage; slump; strength; superplasticizers; thermal stresses; water-cement ratio; workability; General

Date: 3/1/1994

New superplasticizers are needed to produce concretes with less variability in the slump of the mix at the time of placement, and therefore with less variability in the water-cement ratio. In particular, there are two factors that affect slump at the time of placement: the procedure of superplasticizer addition (immediate or delayed) and time of transportation from the batching plant to the worksite. A new method to produce frost-resistant concrete in structures is needed that does not depend on the numerous factors affecting air volume and, therefore, the performance of air-entrained concrete. The preceding characteristics should allow the concrete to be manufactured under better quality control, which is already in place in the industrial process of other construction materials, such as steel, polymers, and ceramics.