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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

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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.

Item Type:Article
Divisions:Science > School of the Built Environment
ID Code:33147
Uncontrolled Keywords:Delayed ettringite formation (DEF), aerated concrete, strength improvement
Additional Information:DOI 10.5897/IJPS2013.3923 not found
Publisher:Academic Journals
Publisher Statement:In accessing the web pages on the International Journal of the Physical Sciences (IJPS) web site, you agree that you will access the contents for your own personal use but not for any commercial use. You can download and you can print out hard copies of any part of the content on IJPS online web site for your personal use. Uses beyond that allowed by the "Fair Use" limitations require permission of the publisher. Any uses and or copies of this Journal in whole or in part must include the customary bibliographic citation, including author attribution, date and article title.


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