Strength, elastic and microstructural properties of SCCs’ with colloidal nano silica addition

Muhammed Yasin Durgun*, Hakan Nuri Atahan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

One of the concerns regarding the elastic behavior of self-compacting concretes (SCC) is their lower stiffness tendency compared to conventional concretes (CC). Because of mixture design methods applied, SCC mixtures, in general, contains higher amounts of fine materials. The use of high volume of fine materials causes a decrease in the amount of total aggregates which have an important role on the strength and elastic properties of concretes. This paper discusses the results of an experimental study which investigated the strength, elastic and microstructural properties of SCC mixtures modified with different particle sizes of colloidal nano-SiO2 (CNS). CNS samples, having 35, 17, and 5 nm average particle size, were used with the aim of reducing the total fine material (fly ash) content in SCC designs. With the help of CNS, the amount of fly ash in reference SCC mixture design was gradually reduced and replaced with aggregates. The mixtures which fulfill desired fresh SCC properties were subjected to compressive tests at 28th and 120th days. Moduli of elasticity of concrete specimens were also measured. Results have shown that, although the use of CNS in reduced-fly ash content mixtures could not compensate the strength decrement, the stiffness of SCC mixtures containing CNS together with fly ash has been strikingly improved even the increase in total aggregate content is not noteworthy. Microscopic investigations has indicated the development of a dense C-S-H gel and interfacial transition zone.

Original languageEnglish
Pages (from-to)295-307
Number of pages13
JournalConstruction and Building Materials
Volume158
DOIs
Publication statusPublished - 15 Jan 2018

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Ltd

Funding

The authors gratefully acknowledge the financial support provided by TÜBİTAK (The Scientific and Technological Research Council of Turkey) as a part of the project number 214M034. The authors would also like to thank KEMİROPA Company for their support for providing the project with CNS samples.

FundersFunder number
TÜBİTAK
National Council for Scientific Research214M034

    Keywords

    • Colloidal nano silica
    • Compressive strength
    • Fly ash
    • Microstructure
    • Modulus of elasticity
    • Pore structure
    • Self-compacting concrete

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