Mechanical and microstructural properties of Alkali Pozzolan Cement (APC)

Journal article


Kulasuriya, Chandana, Dias, W. P. S., Vimonsatit, Vanissorn and De Silva, P.. (2020). Mechanical and microstructural properties of Alkali Pozzolan Cement (APC). International Journal of Civil Engineering. 18(11), pp. 1281-1292. https://doi.org/10.1007/s40999-020-00534-3
AuthorsKulasuriya, Chandana, Dias, W. P. S., Vimonsatit, Vanissorn and De Silva, P.
Abstract

Alkali Pozzolan cement (APC) comprises a high volume of fly ash, lime, ordinary Portland cement (OPC), and a dry Na2SO4 activator. APC can be stored in dry form and only requires water to create a cementitious binder. Mechanical and microstructural properties of APC were investigated to determine the compressive strength and hydration products of different APC pastes. Air-cured APC pastes (w/b = 0.3) were found to gain 65–77% of the strength of similar OPC pastes at 28 days, while being 75% greater than that of corresponding high-volume fly ash ones. Microstructural properties studied using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and thermal analysis were able to explain the observed mechanical properties. The attacking of the smooth fly ash spheres (observed via SEM) by Ca(OH)2, evidenced by a reduction in the latter (observed through thermogravimetry) over a period of 112 days, could be linked to the strength gain of APC over that period. This strength gain could also be associated with the formation of ‘broad humps’, at the relevant 2θ values (around 29° and 32°) in XRD curves, which became more pronounced with time. Strength could also be correlated to the percentage of hydrate bound water, with the differing amounts of lime consumption by fly ash partly responsible for scatter.

Keywordsfly ash; lime; blended Portland cement; dry Na2SO4 activator; microstructural analysis; strength–microstructure correlation
Year2020
JournalInternational Journal of Civil Engineering
Journal citation18 (11), pp. 1281-1292
PublisherSpringer
ISSN1735-0522
Digital Object Identifier (DOI)https://doi.org/10.1007/s40999-020-00534-3
Scopus EID2-s2.0-85086741818
Research or scholarlyResearch
Page range1281-1292
Publisher's version
License
All rights reserved
File Access Level
Controlled
Output statusPublished
Publication dates
Online19 Jun 2020
Publication process dates
Accepted05 Jun 2020
Deposited08 Jul 2021
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