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The use of waste glass as a partial substitution for fine aggregate in concrete design

Lim, Aaron (2014). The use of waste glass as a partial substitution for fine aggregate in concrete design. Bachelor of Engineering (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Lim, Aaron
Title The use of waste glass as a partial substitution for fine aggregate in concrete design
Institution Charles Darwin University
Publication Date 2014
Thesis Type Bachelor of Engineering (4th Year Project)
Abstract The objective of this thesis is to investigate the long term effects of waste glass as av partial substitute for fine aggregate in concrete. This thesis aims to expand on the body of research conducted by Kenneth K. in his Bachelor of Engineering thesis – “The Applications of Recycled Crushed Glass in Civil Construction in the Northern Territory”.

Early research suggests that using waste glass in concrete will stimulate the Alkali Silica reaction (ASR). The ASR occurs over a long time between an alkaline base and a non-crystalline silica reactant. In this case the acid-base reaction is between the calcium hydroxide (Ca(OH)2) found in the cement paste and the silicic acid (H4SiO4) found in the glass cullets. The reaction can be simplified as follows

Ca(OH)2 + H4SiO4 → Ca2+ + H2SiO42− + 2 H2O → CaH2SiO4 · 2 H2O

This reaction alters the volume of the aggregate and results in the swelling and cracking of the concrete structure.

A preliminary sieve analysis suggests that the composite aggregate will have a denser gradation than the fine aggregate alone. A dense gradation suggests most of the air voids between the materials are filled with smaller particles (Mamlouk et al, 1999). This means the amount of voids within a future concrete mix could be reduced by using the more densely graded composite aggregate. The reduction of voids could further increase the overall strength of the concrete mix.

The difference in density between the glass cullet and the fine aggregate was found to be about 11.5% which is a noticeable difference. The effects of using the composite aggregate and changing the overall density of the concrete mix could have a significant effect on the compressive strength of future concrete mix. It is predicted that the compressive strength of future concrete mixes will suffer as the percent of substitution increases and the overall density decreases.

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