Interaction of recycled concrete and geogrid reinforcement material 14m high reinforced earth wall

Gibson, Duane Nikalia (2008) Interaction of recycled concrete and geogrid reinforcement material 14m high reinforced earth wall. [USQ Project]

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[Abstract]: Townsville’s former General Hospital site is undergoing a major redevelopment that includes the construction of twelve elevated, level residential allotments with commanding views across Cleveland Bay towards Magnetic Island. To achieve the above development objectives, a large quantity of fill is required and most importantly will need to be retained to construct the allotments. Numerous methods of retainment were investigated
and the reinforced earth option was discovered to be the most feasible.

A recycled concrete fill material, crushed to 100 mm minus, was proposed to be used in the reinforced earth structure. This material was a result of the demolition of numerous buildings from within the site. External advice suggested that the 100 mm minus material would not integrate sufficiently with the reinforcement (Tensar Geogrid) and would need to be crushed further to a 75 mm minus material. This would help to provide enough resistance to achieve the correct pullout characteristics of the reinforcement.

The objective is to create a testing apparatus that makes it possible to test the interaction of the Tensar Geogrid reinforcement with the various gradings of crushed recycled concrete material. These tests can then be analysed to
confirm interaction calculations and the design of the reinforced earth structure.

A plywood box is constructed to allow the compaction of various grades of crushed concrete within. A similar grade of Tensar grid is used for each test and located centrally within the material. The reinforcement material extrudes
from the box allowing a force to be applied. A load gauge records the pullout force applied to pull the Tensar grid from the apparatus.

The results from the individual tests undertaken are analysed against calculations made for the various types of material. The results are then compared against each other to indicate the ability of interaction and performance under load.

Preliminary analysis indicates that failure strength is similar for all tests undertaken, however the rate of failure gives a good indication of the interaction characteristics of the materials.

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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering (Up to 30 Jun 2013)
Date Deposited: 01 Oct 2009 04:19
Last Modified: 01 Oct 2009 04:19
Uncontrolled Keywords: Townsville; Queensland; recycled crushed concrete; Tensar Geogrid reinforcement; reinforced earth structure
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400510 Structural engineering

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