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AuthorMurray Reid, J.
AuthorHassan, Khaled E.
AuthorSirin, Okan
AuthorTaha, Ramzi A.
Available date2021-09-07T06:16:22Z
Publication Date2016
Publication NameGeotechnical Special Publication
ResourceScopus
ISSN8950563
URIhttp://dx.doi.org/10.1061/9780784480137.051
URIhttp://hdl.handle.net/10576/22834
AbstractRecycled aggregates are widely used in unbound applications in many countries. However, in some areas the materials available may not meet all the requirements of the local specifications. This is the case in Qatar, where large quantities of excavation waste are available. The excavation waste described in this paper is a weak limestone and did not meet the requirements for sand equivalent and liquid limit/plasticity index in the Qatar construction specifications. It did meet requirements for mechanical properties, durability and grading. A trial road was constructed to demonstrate the suitability of the recycled aggregates as unbound subbase. The road consisted of three sections: (1) recycled aggregates made from excavation waste; (2) recycled aggregates made from clean crushed concrete; and (3) excavation waste mixed with 20% dune sand. Two layers of subbase were placed in each section, and the stiffness was measured with a lightweight deflectometer on top of each layer. The compacted trial sections gave satisfactory stiffness but did not achieve 100% of the laboratory dry density, as required by the Qatar construction specifications. A trafficking trial was carried out on the top layer of subbase, and the resulting rut depths were measured. In each section, the measured rut depths were less than 10 mm, compared to a limiting value of 30 mm, and the trafficked surface of the subbase showed no signs of damage. An asphalt layer was then placed and the road has been subjected to repeated load coming from heavy trucks for over one year and is showing no signs of deterioration. The site trial demonstrated the suitability of the locally available materials, thus contributing to sustainable construction. ASCE.
Languageen
PublisherAmerican Society of Civil Engineers (ASCE)
SubjectAggregates
Durability
Excavation
Grading
Recycling
Roads and streets
Specifications
Stiffness
Transportation
Asphalt layer
Construction specifications
Crushed concretes
Deflectometers
Limiting values
Recycled aggregates
Repeated loads
Sustainable construction
Concrete aggregates
TitleDemonstrating the Worth of Recycled Aggregates - A Case Study from Qatar
TypeConference Paper
Pagination534-545
Issue Number270 GSP
Volume Number2016-January
dc.accessType Abstract Only


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