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Developing One-Part Alkali-Activated metakaolin/natural pozzolan Binders using Lime Waste as activation Agent

Kadhim, A, Sadique, MM, Al-Mufti, R and Hashim, KS (2020) Developing One-Part Alkali-Activated metakaolin/natural pozzolan Binders using Lime Waste as activation Agent. Advances in Cement Research. ISSN 0951-7197

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Abstract

Among the several schemes that have been reported to be a satisfactory alternative to Portland cement is Alkali Activated Cement (AAC), which has recently started to gain greater consideration in construction sectors. Conventional two-part alkali activation has many drawbacks, including the activating solution being viscous, problematic and non-user friendly to handle. Thus, this research aims to produce a one-part alkali activated metakaolin/natural pozzolan, by using an earth alkaline source (rich in CaO) from waste material (lime kiln dust), as an activating precursor to break the alumina-silicate crystalline phases. Thermal treatment of materials at two levels of treatment (450°C and 950°C), was used as an assisted activation approach. Analytical techniques including X-Ray powder diffraction XRD, Thermogravimetric Analysis TG-DTA, Fourier Transform Infrared Spectroscopy FTIR and Scanning Electron Microscope SEM, were utilised to investigate the performance of the developed materials at a molecular level. Reduction of crystalline peaks as well as the appearance of new wollastonite minerals within the calcined lime kiln dust, contributed to the development of 27 MPa compressive strength after 28 days. The dissolution made through the pozzolanic reaction as well as thermal treatment evidently contributed to transform crystalline to amorphous phases.

Item Type: Article
Uncontrolled Keywords: 0905 Civil Engineering
Subjects: T Technology > TH Building construction
Divisions: Civil Engineering (merged with Built Env 10 Aug 20)
Publisher: Thomas Telford (ICE Publishing)
Date Deposited: 10 Sep 2020 11:14
Last Modified: 10 Sep 2020 11:14
DOI or Identification number: 10.1680/jadcr.19.00118
URI: http://researchonline.ljmu.ac.uk/id/eprint/13619

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