238.2T-14: Concrete Thixotropy (TechNote)

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Title: 238.2T-14: Concrete Thixotropy (TechNote)

Author(s): ACI Committee 238

Publication: Technical Documents

Volume:

Issue:

Appears on pages(s): 6

Keywords: aggregate segregation; formwork pressure; plastic viscosity; pumpability; rheology; rheometer; static yield stress; thixotropy; yield stress.

Date: 6/1/2014

Abstract:
Fresh concrete can exhibit different rheological behavior when at rest than when flowing. This difference is due to thixotropy, which can have important consequences for formwork pressure, multi-lift casting, slip-form paving, pumping, and segregation resistance. This TechNote defines thixotropy and distinguishes it from other changes in rheological properties; discusses the origins of, test methods for measuring, and factors affecting thixotropy; and concludes with its applications.