Hardening of concrete with a planned delayed ettringite formation

Samo Lubej (Author), Andrej Ivanič (Author), Milan Radosavljević (Author)

Abstract

Delayed ettringite formation (DEF) in cementitious materials is widely considered as a harmful chemical reaction that causes extensive damages in hardened concrete. However, preventative measures and possible improvements in general are not extensively studied and require further attention. In this study was presented an investigation into a type of controlled DEF in places of finely dispersed crystallisation nuclei and provide evidence that the process may improve compressive strength of cementitious materials. The Alkali-Silica Reaction (ASR) in hydrated concrete was achieved with the addition of fly ash and was further accelerated with the Dugganćs test. Achieved strengths and monitoring of microstructure development conducted with electronic microscopy revealed that growth of ettringite crystals in the nuclei led to harmless internal compressive stresses, expansion of hydrated concrete and overall strengthening of the concrete matrix.

Keywords

delayed ettringite formation;concrete;hardening;

Data

Language:	English
Year of publishing:	2009
Typology:	1.08 - Published Scientific Conference Contribution
Organization:	UM FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
UDC:	691
COBISS:	14199318
ISSN:	1735-5540
Views:	1254
Downloads:	32
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
URN:	URN:SI:UM:
Pages:	7 str.
ID:	8717964