Title: Delayed Ettringite Formation in Concrete Containing Limestone Filler

Author(s): Mohammad A. Aqel, and Daman K. Panesar

Publication: Symposium Paper

Volume: 320

Issue:

Appears on pages(s): 43.1-43.12

Keywords: Steam Curing, Limestone Filler, Concrete Expansion, Delayed Ettringite Formation, Freeze-thaw, Microstructural Analysis

DOI: 10.14359/51701081

Date: 8/1/2017

Abstract:
The focus of this paper is to evaluate the effect of replacing 15% (by weight) of the cement by limestone filler on the concrete expansion due to delayed ettringite formation. The freeze-thaw testing and microstructural analysis were conducted to further assess the damage caused by the expansion due to delayed ettringite formation. This study also evaluates the interplay between cement type (Type GU and Type HS), limestone filler content (0 and 15% by weight), and steam curing temperature (55°C [131°F] and 82°C [180°F]). The results showed that replacing 15% of the cement reduced the expansion of concrete due to delayed ettringite formation. However, this reduction in the concrete expansion was insignificant compared to the reduction in concrete expansion when the steam curing temperature was reduced from 82°C [180°F] to 55°C [131°F] or when cement with low sulfate and alkali contents (i.e., HS cement) was used instead of GU cement.