Shaikh, FUA, Supit, SWM and Barbhuiya, S (2017) Microstructure and Nanoscaled Characterization of HVFA Cement Paste Containing Nano-SiO₂ and Nano-CaCO₃. Journal of Materials in Civil Engineering, 29 (8). ARTN 04017063. ISSN 0899-1561
Abstract
This paper presents the effects of nano-SiO2 and nano-CaCO3 on the microstructure of high-volume fly ash (HVFA) cement paste. The microstructures of HVFA cement pastes containing 40 and 60% Class F fly ash were evaluated at 28 days using nanoindentation, X-ray diffraction (XRD), thermogravimetric (DTA/TGA), and mercury intrusion porosimetry (MIP) analyses. A reduction of calcium hydroxide (CH) was seen in XRD analysis of HVFA pastes containing nanoparticles. This observation was also confirmed in the DTA/TGA analysis. The nanoindentation results also showed the evidence of pozzolanic reaction in the HVFA pastes, where the addition of 2% nano-SiO2 and 1% nano-CaCO3 increased the volume fractions of high-density and low-density calcium silicate hydrate (C─ S─ H) gels and confirmed the ability of nanoparticles to reduce the porosity of HVFA pastes, which was consistent with the MIP analysis. The improved nanostructure and microstructure of HVFA pastes due to the addition of nano-SiO2 and nano-CaCO3 in this study show that high-strength and highly durable sustainable concrete can be produced with lower repair and maintenance requirements for the concrete structures.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2017 American Society of Civil Engineers. This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://doi.org/10.1061/(ASCE)MT.1943-5533.0001898. |
Keywords: | High-volume fly ash; Nano-SiO2; Nano-CaCO3; Microstructure; Nanoindentation; Porosity |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 28 Jan 2019 11:25 |
Last Modified: | 25 Jun 2023 21:41 |
Status: | Published |
Publisher: | American Society of Civil Engineers |
Identification Number: | 10.1061/(ASCE)MT.1943-5533.0001898 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:141610 |