Slump Loss and Rheology of Superplasticized Mortar and Concrete With Different Polysaccharide Syrups

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Title: Slump Loss and Rheology of Superplasticized Mortar and Concrete With Different Polysaccharide Syrups

Author(s): G. Mantegazza and E. Alberti

Publication: Special Publication

Volume: 148

Issue:

Appears on pages(s): 105-120

Keywords: admixtures; compressive strength; concretes; flexural strength; mortars (material); polysaccharides; rheological properties; setting (hardening); slump; superplasticizers; workability; Materials Research

Date: 9/1/1994

Abstract:
The rheological properties of fresh mortar and concrete were studied with five types of polysaccharide syrup added to either naphthalene or melamine sulfonate-based superplasticizer. The effects of the binary admixture system (superplasticizer and syrup) on the physicomechanical properties of the cementitious system, based on two types of cement (portland and pozzolan), were studied. The properties, studied at 25 and 40 C, were slump, loss of workability, setting time, and compressive and flexural strength. For one type of syrup added to the superplasticizer, synergistic effects were observed. In particular, it was demonstrated that, at 40 C, it is possible to increase the slump and reduce loss of workability using an admixture based on naphthalene sulfonate, plus Syrup G62 and melamine sulfonate, plus Syrup G62, compared to normal superplasticizer-retarding admixtures.