Title:
Development of High-Strength Self-Consolidating Geopolymer Concrete
Author(s):
Mahdi Heshmati, M. Neaz Sheikh, and Muhammad N.S. Hadi
Publication:
Materials Journal
Volume:
122
Issue:
6
Appears on pages(s):
85-100
Keywords:
ambient curing; chemical composition; high strength; self- consolidating geopolymer concrete (SCGC); Taguchi method; Technique for Order Preference by Similarity to Ideal Solution (TOPSIS)
DOI:
10.14359/51749127
Date:
11/1/2025
Abstract:
This study comprehensively investigates the development of
ambient-cured self-consolidating geopolymer concrete (SCGC) based on the chemical composition of binders and alkaline activators. Five factors of the chemical composition of binders and alkaline activators, each with four levels, are used to evaluate and optimize the workability and compressive strength of the high-strength SCGC. The designed SCGC mixtures provided sufficient workability properties and compressive strength between 28 and 70.3 MPa (4061 and 10,196 psi). It was found that the SCGC mixture with a binder content of 600 kg/m3 (37.4 lb/ft3), a CaO/(SiO2 + Al2O3) mass ratio of 0.55, an Na2O/binder mass ratio of 0.11, an SiO2/Na2O mass ratio of 1.2, and an Na2O/H2O mass ratio of 0.35 was the optimum mixture, which achieved a slump flow of 770 mm (30.3 in.), 28-day compressive strength of 70.3 MPa (10,196 psi), and final setting time of 80 minutes. The CaO/(SiO2 + Al2O3) ratio in binders, binder content, and Na2O/binder mass ratio have been found to be the most influential factors on the workability and compressive strength of ambient-cured SCGC. Microstructural analysis of SCGC mixtures showed that the increase in the CaO/(SiO2 + Al2O3) ratio promoted the formation of calcium-
aluminate-silicate-hydrate (C-A-S-H) gels and enhanced the compressive strength by filling voids and creating a compact and dense microstructure.
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