Applications of Rheological Modifiers and Superplasticizers in Cementitious Systems

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Title: Applications of Rheological Modifiers and Superplasticizers in Cementitious Systems

Author(s): C. B. Skaggs, W. G. Rakitsky, and S. F. Whitaker

Publication: Special Publication

Volume: 148

Issue:

Appears on pages(s): 189-208

Keywords: cellulose fibers; cement-based systems; compressive strength; grout; polysaccharides; rheological properties; superplasticizers; underwater construction; water retentivity; General

Date: 9/1/1994

Abstract:
The impact of superplasticizers and water-soluble polymers, i.e., rheological modifiers, on the rheology and performance of cement-based systems has been investigated. Combinations of water-soluble polymers and superplasticizers can be used to formulate grouts, mortars, and concretes with properties tailored for specific applications. Cement-based systems studied ranged from highly fluid injection grouts to cohesive, flowable concretes suitable for underwater construction and repair applications. Paper demonstrates how the rheology and performance characteristics of cement-based systems can be manipulated using superplasticizers and rheological modifiers. Specifically, the performance properties of a high-molecular-weight polysaccharide produced to fermentation are compared and contrasted with cellulose derivatives. Combinations of water-soluble polymers and superplasticizers can be formulated to produce a continuum of properties ranging from highly fluid, nonseparating grouts to low-slump concretes with enhanced workability and water retention. Choice of the proper combination of superplasticizer and water-soluble polymer is determined by the functional demands of each application.