Durability of Green Concrete Composed of Fly Ash, GGBS, Quarry Dust, and RCA after Acid Exposure

AbstractGreen concrete utilizes industrial waste resources as fine and coarse aggregates, to partially replace cement in concrete using supplemental cementitious materials. The primary goal of the present study was to explore the acid durability of green concretes with different compressive strength...

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Bibliographic Details
Published in:Practice periodical on structural design and construction 2024-11, Vol.29 (4)
Main Authors: Hiremath, Parameshwar, Parray, Abdul Basit, Hassan, Aamir, Kankeri, Pradeep
Format: Article
Language:English
Subjects:
Acids
Aggregates
Calcium silicate hydrate
Cement
Comparative studies
Compressive strength
Concrete
Concrete aggregates
Cubes
Durability
Dust
Field emission microscopy
Fly ash
GGBS
Industrial wastes
Microstructure
Portland cements
Quarries
Sulfuric acid
Technical Papers
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Summary:AbstractGreen concrete utilizes industrial waste resources as fine and coarse aggregates, to partially replace cement in concrete using supplemental cementitious materials. The primary goal of the present study was to explore the acid durability of green concretes with different compressive strengths of 30 and 40 MPa. In green concrete, fly ash and ground granulated blast furnace slag (GGBS) were adopted as SCMs, and quarry dust (QD) and recycled coarse aggregates (RCA) were adopted as replacements for fine and coarse aggregates, respectively. The acid durability assessment was carried out by immersing concrete cubes in H2SO4 and HCl solutions followed by residual compressive strength comparison. For comparative study purposes, the same grades of ordinary concrete were prepared, tested, and subjected to similar acid exposure. The microstructural investigation was also accomplished by employing field emission scanning electron microscopy (FE-SEM) analysis and energy-dispersive X-ray spectroscopy (EDS). It was found that concrete with 30% GGBS and 20% fly ash and the remaining 50% ordinary portland cement as cementitious materials along with 40% QD and 30% RCA as aggregate replacements gives adequate compressive strength and performs better in aggressive environments as compared to traditional concrete. These mixes were found to have denser microstructures with silica-rich, calcium silicate hydrate (C-S-H) gel.
ISSN:1084-0680
1943-5576
DOI:10.1061/PPSCFX.SCENG-1499