Potential reduction of concrete deterioration through controlled DEF in hydrated concrete

Lubej, S. and Radosavljevic, M. (2013) Potential reduction of concrete deterioration through controlled DEF in hydrated concrete. International Journal of Physical Sciences, 8 (24). pp. 1307-1318. ISSN 1992-1950

Abstract/Summary

Delayed ettringite formation (DEF) is a chemical reaction with proven damaging effects on hydrated concrete. Ettringite crystals can cause cracks and their widening due to pressure on cracked walls caused by the positive volume difference in the reaction. Concrete may show improvements in strength at early ages but further growth of cracks causes widening and spreading through the concrete structure. In this study, finely dispersed crystallization nuclei achieved by adding air-entraining agent (AEA) and short vibration of specimens is presented as the main prerequisite for reducing DEF-induced deterioration of hydrated concrete. The study presents the method and mechanism for obtaining the required nucleation. Controlling long-term DEF by providing AEA-induced crystallisation nuclei, prevented excessive and rapid initial strength improvements, and resulted in a slight increase of compressive strength of fine grained concrete with only marginally lower density.

Additional Information	DOI 10.5897/IJPS2013.3923 not found
Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/33147
Item Type	Article
Refereed	Yes
Divisions	Science > School of the Built Environment
Uncontrolled Keywords	Delayed ettringite formation (DEF), aerated concrete, strength improvement
Additional Information	DOI 10.5897/IJPS2013.3923 not found
Publisher	Academic Journals
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