Abstract

This paper assesses the feasibility of using liquid crystal display (LCD) waste glass as a supplementary cementing material in cement mortars. Two different sizes of LCD waste glass powder (LGP) particles were used (5 µm and 12 µm) with two substitution levels with cement in mortar (10% and 20%). The resulting mortars were evaluated for strength, hydration, porosity and durability through various experimental techniques. It was found that LGP particles lead to appreciable strength gain at all ages in comparison with control mortar, especially significant strength gain of 18% was observed at 28-day. This is attributed to the greater gel-space ratio as corroborated by the experimental determination of porosity, which is found less for LGP-incorporated mortars as compared to control cement mortar. The smaller particle size of LGPs not only accelerates the pozzolanic reaction in alkaline cementitious matrix, but also fills the smaller pores, thus reducing porosity and contributing to strength gain. Increased hydration was also elucidated qualitatively by backscattered electron imaging. Due to the increased hydration in LGP-incorporated pastes and mortars, the durability (in terms of chloride ion permeability) has also been found improved. Thus, it is established that 10% (by weight) of cement can be replaced with 12 μm LGP, whereas 20% can be replaced with 5 μm LDP for improved strength and durability. Incorporating LCD waste in mortars and concretes as partial replacement of cement can not only help utilize this potentially hazardous waste, but also significantly reduce the associated carbon dioxide emissions, thus promoting sustainable development.

Highlights

  • Concrete is the most widely used man-made material on earth

  • The current study focuses on liquid crystal display (LCD) waste glass generated from LCD manufacturers due to defects in processing and cutting or bonding in the LCD panels

  • The objective of this this study study was was to the suitability suitability of of LCD waste glass powder (LGP)

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Summary

Introduction

Concrete is the most widely used man-made material on earth. Its annual production is in billions of tons worldwide [1]. Materials 2018, 11, 2538 recycled aggregate concrete [3,16,17], ceramic waste [18,19,20], or crushed bricks [21] Another potentially suitable material for use as supplementary cementing material (SCM) is liquid crystal display (LCD). The current study focuses on LCD waste glass generated from LCD manufacturers due to defects in processing and cutting or bonding in the LCD panels These defective LCD panels contain trace amounts of elements such as copper, manganese, molybdenum, and iron, and cannot be recycled due to extremely intricate recycling processes. The use of LCD glass panel waste as SCM in concrete and mortars has been studied, its detailed hydration attributes have not been investigated. This paper is novel because it investigates the durability of cement mortars, as well as innovatively corroborates the pozzolanic reaction of LGP in an alkaline cementitious matrix by using backscattered electron image analysis

Materials Characterization
Mixture
Compressive Strength Testing
Chloride Diffusion
Porosity and Pore Size Distribution
Compressive Strength
Porosity
ChlorideThe
Findings

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