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LABAJ, M. HELA, R. HÁJKOVÁ, I.
Original Title
Nanosilica Activated High Volume Fly Ash Concrete: Effects on Selected Properties
Type
conference paper
Language
English
Original Abstract
By volume, there is no other material used as much as concrete. Its mechanical properties, durability and favorable price makes concrete the perfect construction material. In last few decades, we are seeing a growing trend of partial Portland cement’s replacement with secondary raw materials, most commonly with fly ash. So-called high volume fly ash (HVFA) concretes usually contains over 50% of it. While HVFA concrete’s long-term properties and price are improved over the classical one, its early age properties are often affected negatively. Here, a highly reactive pozzolans enters the scene. Materials like microsilica and metakaolin are known to accelerate concrete’s strength development and improve early age characteristics. In this paper, nanosilica is used for this purpose. These SiO2 nanoparticles possesses a much higher surface area and thus reactivity. Three mixtures with 0, 40 a 60% portland cement’s replacement with fly ash were prepared and tested with and without addition of small amount of nanosilica. Effects on compressive strength and static modulus of elasticity were observed. Results clearly demonstrates that even with dosage in the range of tenths of percent, nanosilica can significantly improve concrete’s properties.
Keywords
HVFA concrete, fly ash, nanosilica, pozzolan.
Authors
LABAJ, M.; HELA, R.; HÁJKOVÁ, I.
Released
1. 12. 2016
Publisher
Trans Tech Publications
Location
Switzerland
ISBN
978-3-0357-1079-3
Book
Special Concrete and Composites 2016
1662-9795
Periodical
Key Engineering Materials (web)
Number
722
State
Swiss Confederation
Pages from
157
Pages to
162
Pages count
6
BibTex
@inproceedings{BUT146083, author="Martin {Labaj} and Rudolf {Hela} and Iveta {Tuscher Hájková}", title="Nanosilica Activated High Volume Fly Ash Concrete: Effects on Selected Properties", booktitle="Special Concrete and Composites 2016", year="2016", journal="Key Engineering Materials (web)", number="722", pages="157--162", publisher="Trans Tech Publications", address="Switzerland", doi="10.4028/www.scientific.net/KEM.722.157", isbn="978-3-0357-1079-3", issn="1662-9795" }