Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Durability studies on conventional concrete and slag-based geopolymer concrete in aggressive sulphate environment

Garg, Atul, Jangra, Parveen, Singhal, Dhirendra, Pham, Thong M. and Ashish, Deepankar Kumar ORCID: https://orcid.org/0000-0003-3690-5752 2024. Durability studies on conventional concrete and slag-based geopolymer concrete in aggressive sulphate environment. Energy, Ecology and Environment 9 , pp. 314-330. 10.1007/s40974-023-00300-w
Item availability restricted.

[thumbnail of Durability Studies on Conventional Concrete and Slag-Based Geopolymer .pdf] PDF - Accepted Post-Print Version
Restricted to Repository staff only until 4 November 2024 due to copyright restrictions.

Download (1MB)

Abstract

As a potential substitute to conventional concrete, slag-based geopolymer concrete can be a promising material towards green and low carbon building approach. However, the lack of understanding of its performance subjected to sulphate environment can prohibit its use to some extent. This study examines the properties of conventional concrete exposed to a severe sulphate environment in comparison with slag-based geopolymer (SGPC). Plain cement concrete (PCC) also known as conventional concrete was cast using ordinary Portland Cement (OPC) as a binder. The durability of both types of concrete was examined by immersing test specimens in sulphate solutions (for varied salt concentrations of 2 and 4 g/l) for different curing ages up to a year. The performance of both types of concrete was studied for both mechanical and durability properties. Mechanical properties included compressive, tensile and flexural strengths (FS), while durability consisted of sorptivity, chloride diffusion, corrosion, EDS and SEM studies. The outcomes of this study revealed that the compressive (CS) and split tensile strengths (STS) of both OPC and SGPC decreased with the increase in magnesium sulphate salt concentrations and curing age. After being exposed to a 4% sulphate solution for 365 days, a decrease in the compressive strength was observed by 36.53% in SGPC and 55.97% in OPC, and a similar trend was found for the FS and STS. Rapid chloride permeability (RCPT) and sorptivity test results showed an increased diffusion with age and thus supported the findings of the compressive strength. Micro-structural properties were also studied, and observations showed that the formation of Sodium alumino-silicate hydrate (N–A–S–H) and Calcium alumino-silicate hydrate (C–A–S–H) was more obvious with the curing age in SGPC. At the same time, C–S–H gel formation decreased in conventional concrete with an increase in sulphate salt concentration. The cumulative effect of all these factors led to a much higher corrosion rate of rebars embedded in conventional concrete than in SGPC. Therefore, slag-based geopolymer concrete performed better than conventional concrete in an aggressive sulphate environment for all curing periods.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Springer
ISSN: 2363-7692
Date of First Compliant Deposit: 7 November 2023
Date of Acceptance: 12 October 2023
Last Modified: 03 Jul 2024 11:50
URI: https://orca.cardiff.ac.uk/id/eprint/163670

Citation Data

Cited 2 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics