Samo Lubej (Author), Milan Radosavljević (Author)

Abstract

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.

Keywords

delayed ettringite formation;aerated concrete;strength improvement;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
UDC: 691
COBISS: 17035542 Link will open in a new window
ISSN: 1992-1950
Views: 987
Downloads: 25
Average score: 0 (0 votes)
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Other data

Secondary language: English
URN: URN:SI:UM:
Type (COBISS): Not categorized
Pages: str. 1307-1318
Volume: ǂVol. ǂ8
Issue: 24
Chronology: 30 June 2013
DOI: 10.5897/IJPS2013.3923
ID: 1439583