C. Banupriya ¹, Sharon John ¹, R. Suresh ¹, E. Divya ¹, D. Vinitha ¹

Affiliations
1 Department of Civil Engineering, Vel Tech High Tech Dr. Rangarajan Dr. Sakunthala Engineering College, Chennai – 600062, Tamil Nadu, IN

Abstract

Objective: This study mainly focused on use of quarry dust on replaced with river sand for making geopolymer bricks and paver blocks. Method: Investigations were done on usage of eco-friendly Geopolymer Concretes in lieu of OPC concrete for producing geopolymer bricks and paver blocks. Fly ash, GGBS, aggregates and pellet form of sodium hydroxide were mixed together, then, distilled water was added to form alkaline condition. After one-day period, sodium silicate solution was mixed with concrete mixtures to prepare geopolymer concrete. The geopolymer concrete specimen were tested against compressive strength, split tensile strength and flexural strength. Findings: GPCC with 50% sand and 50% quarry dust produced excellent compressive strength, flexural strength and split tensile strength. GPC paver block using 75% GGBS and 25% fly ash shows excellent compressive strength. Geopolymer brick using 65% FA&35% GGBS produced good compressive strength. Applications/Improvements: A high volume fly ash based geopolymer concrete (mix proportion of 65, 70, 75 and 80% FA) used for bricks and high volume ground granulated blast furnace slag based geopolymer concrete (mix proportion of 65, 70, 75 and 80% GGBS) used for pavers blocks.

Keywords

Fly Ash, Geopolymer Bricks, GGBS, Paver Blocks, Quarry Dust

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Sharon John ¹, C. Banu Priya ², Y. Preethy Dharanya ¹, Meera Muthulakshmi ¹, R. Suresh ¹, M. S. Dinesh Kumar ¹, M. S. Hari Krishnan ¹

Affiliations
1 Department of Civil Engineering, Vel Tech High Tech Dr. Rangarajan Dr. Sakunthala Engineering College, Chennai - 600062, Tamil Nadu, IN
2 Department of Civil Engineering, Vel Tech Engineering College, Chennai - 600062, Tamil Nadu, IN

Abstract

Objectives: Numerical investigations were done using corroded and uncorroded coupons, thereby for casting its prevention for the deterioration of structures. Methods/Statistical Analysis: Structural steel which is widely used is almost prone to corrosion in aggressive environments. Consistent replacement of the corroded member is uneconomical and therefore its yield strength has to be determined in order to estimate its reduced stresses of the members. This paper presents the numerical modelling of 4 coupons extracted from angle of 50x50x5mm and 7 coupons extracted from 80NB (nominal bore) mild steel sections subjected to different level of corrosion. The stress strain characteristics for both angular and tubular coupons were obtained from the analyses and verified with the experimental values. Findings: The stress strain characteristics for both angular and tubular coupons were obtained from the analyses and verified with experimental data. The analysis proved to produce excellent results with less than10% difference from its experimental results. Applications: This paper concludes with the numerical studies carried out on stress strain characteristic behavior of corroded coupons extracted from angle and tubular sections. The numerical modeling has been done based on the finite element method in which corroded coupons through experiment has been extracted and simulated using discretisation technique. Later compared and validated with experimental results obtained. This paper presented that due to corrosion in structural steel the yield stress had been reduced than in uncorroded coupons and the corrosion causes loss of mechanical strength on the specimen. The tensile test from the experiment and the numerical investigation provided excellent result while in comparison. It was observed that due to corrosion the physical property of steel was reduced and strength degradation occurred. Hence the numerical modelling technique could determine the stress strain characteristics of coupons successfully without any economic constraints.

Keywords

Coupons, Numerical Study, Stress-Strain Analysis

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