Properties of mortars made with waste glass as fine aggregate – a South African study

Palesa P. Mokoni, Stephen O. Ekolu, Harry Quainoo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

An investigation was conducted on the potential use of waste glass (WG) as fine aggregates in mortars. It is estimated that 7.2 % of the waste stream in South Africa consists of glass. Much of this WG is disposed to landfills. In the present study, mortar mixtures of 3.0 aggregate/cement ratio and water/cement ratio of 0.6 were used. WG was incorporated as partial replacement of granite fine aggregate in proportions of 0, 20, 30, 50 and 70%WG. Mortar cubes of 50 mm size and prisms of size 25 x 25 x 285 mm, were prepared. The tests conducted include density and workability, compressive strength and expansion due to alkali-silica reaction (ASR) as per ASTM C 1260. It was found that workability increased with increase in the proportion of WG incorporated into the mixtures, while density and compressive strength correspondingly decreased. Strength loss not exceeding 11% was obtained for proportions of 20 to 30% WG fine aggregate. Also, 20% WG mixture gave ASR expansion of less than 0.10% at 16 days which satisfies the requirement for non-expansive cementitious systems.

Original languageEnglish
Title of host publicationFib Symposium 2016
Subtitle of host publicationPerformance-Based Approaches for Concrete Structures, Proceedings
EditorsHans Beushausen
Publisherfib. The International Federation for Structural Concrete
Pages2140-2144
Number of pages5
ISBN (Print)9782883941229
Publication statusPublished - 2016
EventInternational fib Symposium on Performance-Based Approaches for Concrete Structures, 2016 - Cape Town, South Africa
Duration: 21 Nov 201623 Nov 2016

Publication series

Namefib Symposium
ISSN (Print)2617-4820

Conference

ConferenceInternational fib Symposium on Performance-Based Approaches for Concrete Structures, 2016
Country/TerritorySouth Africa
CityCape Town
Period21/11/1623/11/16

Keywords

  • Alkali-silica reaction
  • Compressive strength
  • Expansion
  • Waste glass

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science (miscellaneous)

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