Split Addition of an HRWRA and its Effect on High-Performance Concrete


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Title: Split Addition of an HRWRA and its Effect on High-Performance Concrete

Author(s): J. J. Schemmel, v. Arora, and J. Williams

Publication: Special Publication

Volume: 148


Appears on pages(s): 301-316

Keywords: admixtures; coarse aggregates; concretes; freeze-thaw durability; high-performance concretes; strength; water-reducing agents; workability; General

Date: 9/1/1994

High-performance concretes (HPC) typically have low w/c to achieve the desired levels of strength and durability. As a result, HPC have a tendency to be stiff and lose their workability rather quickly. Often, high-range water-reducing admixtures (HRWRA) are used to improve the workability of HPC. Care must be exercised when using any admixture, or combination of admixtures, to insure that there are no detrimental side effects that might shorten the life of the concrete. Research has shown that, although retempering concrete with an HRWRA will generally improve workability and maintain the strength of low-w/c concretes, it may also reduce freeze-thaw resistance. Therefore, an experimental study was