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Title:
Potential reduction of concrete deterioration through controlled DEF in hydrated concrete
Authors:
ID
Lubej, Samo
(Author)
ID
Radosavljević, Milan
(Author)
Files:
http://www.academicjournals.org/IJPS/PDF/pdf2013/30Jun/LubejandRadosavljevic.pdf
Language:
English
Work type:
Not categorized
Typology:
1.01 - Original Scientific Article
Organization:
FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
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
Year of publishing:
2013
Number of pages:
str. 1307-1318
Numbering:
Vol. 8, 24
PID:
20.500.12556/DKUM-50443
UDC:
691
ISSN on article:
1992-1950
COBISS.SI-ID:
17035542
DOI:
10.5897/IJPS2013.3923
NUK URN:
URN:SI:UM:DK:U8PQVEMF
Publication date in DKUM:
10.07.2015
Views:
1514
Downloads:
31
Metadata:
Categories:
Misc.
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Record is a part of a journal
Title:
International journal of physical sciences
Shortened title:
Int. j. phys. sci.
Publisher:
Academic Journals
ISSN:
1992-1950
COBISS.SI-ID:
16148758
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