Mechanical Strength and Microstructure of GGBS-SCBA based Geopolymer Concrete

Title

Mechanical Strength and Microstructure of GGBS-SCBA based Geopolymer Concrete

Creator

H.M. T.; Unnikrishnan S.

Description

This paper deals with the attempt to develop and study the performance of ground granulated blast furnace slag (GGBS) and sugarcane bagasse ash (SCBA) based sustainable geopolymer concrete. NaOH (8M, 10M, and 12M) and Na2SiO3 were used as alkaline activators with a ratio of 2.5. SCBA mainly acted as amorphous silica and has been utilized as a substitute material for GGBS. The effect of SCBA contents (0%, 5%, 10%, 15% & 20% by the mass of binder) in terms of fresh, hardened, microstructural, and correlation properties of geopolymer concrete developed have been evaluated. Different tests such as the slump cone test, compression test, split tensile test, flexure test, and ultrasonic pulse velocity test were conducted. Scanning electron microscopy, Energy dispersive analysis, and X-ray diffraction analysis were investigated for understanding the microstructural properties. The research findings have shown that with an increase in molarity from 8M to 12M there is an increase in the strength properties of geopolymer concrete. The results in this current study show that 28 days compressive strength was found to increase by 415% when the NaOH molarity was increased from 8M to 10M and 821% when the NaOH molarity was increased from 8M to 12M. The geopolymer concrete developed with 20% SCBA and 80% GGBS with 8M NaOH solution and SS/SH ratio of 2.5 can be used for a target strength of 3035 MPa. Scanning electron microscope images show a packed and dense matrix, which clearly outlines the reason behind the attainment of higher strength in higher molarity of GGBS-SCBA based geopolymer concrete samples and the presence of CASH gel confirmed this in the geopolymer matrix. Furthermore, there is a strong correlation between the experimental findings and the model equations proposed. These presented models will be useful in improving the strength of geopolymer concrete incorporating agricultural and industrial wastes. 2023 The Authors

Source

Journal of Materials Research and Technology, Vol-24, pp. 7816-7831.

Date

2023-01-01

Publisher

Elsevier Editora Ltda

Subject

Calcium aluminate silicate gel; Geopolymer concrete; Scanning electron microscope images; Ultrasonic pulse velocity; X-ray diffraction analysis

Coverage

H.M. T., Department of Civil Engineering, CHRIST (Deemed to be University), Bangalore, India, Department of Civil Engineering, Ballari Institute of Technology & Management, Ballari, India; Unnikrishnan S., Department of Civil Engineering, CHRIST (Deemed to be University), Bangalore, India

Rights

All Open Access; Gold Open Access

Relation

ISSN: 22387854

Format

Online

Language

English

Type

Article

Identifier

https://doi.org/10.1016/j.jmrt.2023.05.051

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