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Viability of using recycled automotive tyre rubber as aggregate in concrete

Sommerville, Samuel James (2014). Viability of using recycled automotive tyre rubber as aggregate in concrete. Bachelor of Engineering (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Sommerville, Samuel James
Title Viability of using recycled automotive tyre rubber as aggregate in concrete
Institution Charles Darwin University
Publication Date 2014
Thesis Type Bachelor of Engineering (4th Year Project)
0912 - Materials Engineering
Abstract Concrete is one of the most extensively used materials within the construction industry. Aggregates make up 70-80% of the concrete mixture, making them the most important components in concrete production; this factor has unavoidably led to an increasing demand in sourcing these natural materials used for their production. The consumption of natural resources develops a growing concern into the sustainability of these practices and a need to preserve these by possibly partially replacing there resources with alternative materials which are recycled or waste materials.

This thesis was conducted to explore the use of recycled automotive tyre rubber as a partial replacement for fine aggregates in concrete construction. The initial part of this thesis the background of the study and the extent of the problem were explored, a review of relevant literature into previous studies within this area was completed. The experimental research for this thesis was begun by conducting tests on the raw materials to determine their properties and suitability for their use in this thesis. Concrete mix designs were then prepared using the Design of Normal Concrete Mixes Second Edition, and a total of 4 mix designs were developed 3 with percentage replacements of fine aggregate of 5%, 10% & 15% of rubber aggregate by volume as well as one control mix with no replacement of fine aggregate was produced for a comparative analysis. Laboratory tests were conducted on the prepared concrete mixes and test cylinders including; slump, unit weight and compressive strength tests, the test results were compared with the respective conventional concrete properties.

The background reading into previous studies and the experimental work completed during this thesis were analysed and it can be concluded that the introduction of crumb rubber into the concrete mixture can decrease the compressive strength in comparison to conventional concrete. However, the presence of the higher levels of moisture in the crumb rubber and its low unit weight in comparison to traditional aggregates have shown potential for an increase in workability, impact resistance, the strength weight ratio and overall flexibility of the concrete. These favourable properties can potentially develop a large market for the rubberized concrete making it a suitable material for such applications as architectural and interior construction, areas where shock wave absorbing or vibration damping is necessary and where resistance to impact or explosion is required. The overall results show that it is possible to use recycled rubber tyres in concrete construction as a partial replacement for fine aggregates, nevertheless, the percentage of replacement should be limited to a specified amount and the application should be restricted to particular cases where the improved properties due to the rubber aggregates are desirable and when the corresponding demerits of the rubber aggregates don’t affect the use of the structure. To understand the extent of the capability of this composite construction material further study has to be done to achieve a standard for the mix design of this relativity unexplored technology.
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Created: Fri, 28 Aug 2015, 10:43:47 CST by Jessie Ng