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Influence of mechanochemical activation on the rheological, fresh and mechanical properties of one-part geopolymer grout.

Authors :
Hamid Abed, Mukhtar
Abbas, Israa Sabbar
Canakci, Hanifi
Source :
Advances in Cement Research; Mar2023, Vol. 35 Issue 3, p96-110, 15p
Publication Year :
2023

Abstract

One-part geopolymer (OPG) grout offers advantages over two-part geopolymer grout in the handling and storage of feedstocks, mainly because of the large quantities of caustic solutions that must be handled for producing two-part geopolymer. However, OPG often suffers from a low degree of reaction, a high number of crystalline by-products and, as a result, low strength. Here, one-part geopolymer was assisted by mechanochemical activation (MC-OPG) to produce grout. The precursor materials (slag and fly ash) and sodium silicate were mechanochemically activated utilising co-grinding to produce a geopolymeric precursor, after which water is the only additive required to initiate the geopolymerisation reaction. The effects of slag/fly ash ratios on grout mixtures were also investigated. A series of tests was examined, including rheological characteristics, setting time, bleeding, unconfined compressive strength (UCS), ultrasonic pulse velocity, scanning electron microscopy and X-ray diffraction. The results showed that the mechanochemical activation technique increased the rheological characteristics and reduced the fresh properties (setting time and bleeding) of geopolymer grout compared to the one-part geopolymer. Considering mechanical properties, the UCS of MC-OPG grout was higher (41–73%) than that of OPG grout. Furthermore, slag content significantly affected the rheological, fresh and mechanical properties of all the geopolymer grouts regardless of the activation method. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09517197
Volume :
35
Issue :
3
Database :
Complementary Index
Journal :
Advances in Cement Research
Publication Type :
Academic Journal
Accession number :
162200971
Full Text :
https://doi.org/10.1680/jadcr.21.00205