ACI PRC-238.2-14: TechNote: Concrete Thixotropy

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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.

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

TechNotes are a committee document that are narrowly focused, single-topic guides, usually practice oriented, that present a specific direction on a particular issue. ACI committee documents (including TechNotes) are reviewed and approved by ACI's Technical Activities Committee.


Document Details

Author: ACI Committee 238

Publication Year: 2014

Pages: 6


Categories: Materials

Formats: PDF

Table of Contents


Description of thixotropy

Origins of thixotropy

Measuring thixotropy

Effects of concrete materials and temperature on thixotropy

Applications of thixotropy


Referenced standards and reports


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