Incorporating liquid crystal display (LCD) glass waste as supplementary cementing material (SCM) in cement mortars-Rationale based on hydration, durability, and pore characteristics

Seong Kyum Kim, Asad Hanif, Il Young Jang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

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.

Original languageEnglish
Article number2538
JournalMaterials
Volume11
Issue number12
DOIs
StatePublished - 13 Dec 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 by the authors.

Keywords

  • Cement mortar
  • Hydration characteristics
  • LCD
  • Porosity
  • SCM

ASJC Scopus subject areas

  • Condensed Matter Physics
  • General Materials Science

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