Mechanical and microstructural properties of self-compacting concrete blended with metakaolin, ground granulated blast-furnace slag and fly ash

•The amount of SP increased with the increase of MK and GGBS in SCC to achieve the same consistency as PC.•MK gave the most enhancing effect as an SCM on mechanical and microstructural properties of SCC.•MK and GGBS were able to enhance modulus of elasticity which was correlated well with strength o...

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Bibliographic Details
Published in:Construction & building materials 2017-08, Vol.146, p.658-667
Main Authors: Dadsetan, Sina, Bai, Jiping
Format: Article
Language:English
Subjects:
Analysis
Blast furnaces
Chemical properties
Compressive strength
Concrete mixing
Concretes
Energy dispersive X-ray spectroscopy (EDS)
Fly ash
Ground granulated blast-furnace slag
Kaolin
Materials
Metakaolin
Methods
Mixture design method
Modulus of elasticity
Properties
Scanning electron microscope (SEM)
Self-compacting concrete
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Summary:•The amount of SP increased with the increase of MK and GGBS in SCC to achieve the same consistency as PC.•MK gave the most enhancing effect as an SCM on mechanical and microstructural properties of SCC.•MK and GGBS were able to enhance modulus of elasticity which was correlated well with strength of SCC.•MK has a greater effect on the microstructural strength of the transition zone than GGBS.•Lower Ca/Si ratios indicate the improvement of compressive strength. The aim of this study is to investigate the mechanical and microstructural properties of self-compacting concrete (SCC) mixtures containing three supplementary cementitious materials (SCMs), namely metakaolin, ground granulated blast-furnace slag and fly ash. For the mixtures, cement was replaced by SCMs at different levels. The mechanical properties were evaluated against a control mixture (without SCM). The microstructural properties were examined using SEM and EDS on mixtures with high volume of SCMs. The utilisation of SCMs enhanced compressive strengths. Metakaolin gave the most enhancing effect as a replacement material to cement on mechanical and microstructural properties of SCC at all ages.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2017.04.158