The Use of Recycled Concrete Aggregate in a Dense Graded Aggregate Base Course PDF Download
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Author: Thomas Bennert
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 70
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Book Description
Author: Thomas Bennert
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 70
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Book Description
Author: Robert Fredwin Baker
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 64
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Book Description
Author: Filipe Miguel Borges Romero Monteiro
Publisher:
ISBN:
Category :
Languages : en
Pages : 218
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Book Description
Author: Ravindra K Dhir
Publisher: ICE Publishing
ISBN: 9780727764638
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
The book is an ideal source of information on the subject and would be a suitable addition to any library as a resource for researchers seeking to develop an overview of the research on this topic.
Author: Khaled Sobhan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
This study evaluates the benefits to be gained by using a composite highway base course material consisting of recycled crushed concrete aggregate, portland cement, fly ash, and a modest amount of reinforcing fibers. The primary objectives of this research were to (a) quantify the improvement that is obtained by adding fibers to a lean concrete composite (made from recycled aggregate and low quantities of Portland cement and/or fly ash), (b) evaluate the mechanical behavior of such a composite base course material under both static and repeated loads, and (c) utilize the laboratory-determined properties with a mechanistic design method to assess the potential advantages. The split tensile strength of a stabilized recycled aggregate base course material was found to be exponentially related to the compacted dry density of the mix. A lean mix containing 4% cement and 4% fly ash (by weight) develops sufficient unconfined compressive, split tensile, and flexural strengths to be used as a high quality stabilized base course. The addition of 4% (by weight) of hooked-end steel fibers significantly enhances the post-peak load-deformation response of the composite in both indirect tension and static flexure. The flexural fatigue behavior of the 4% cement-4% fly ash mix is comparable to all commonly used stabilized materials, including regular concrete; the inclusion of 4% hooked-end fibers to this mix significantly improves its resistance to fatigue failure. The resilient moduli of stabilized recycled aggregate in flexure are comparable to the values obtained for traditional soil-cement mixes. In general, the fibers are effective in retarding the rate of fatigue damage accumulation, which is quantified in terms of a damage index defined by an energy-based approach. The thickness design curves for a stabilized recycled aggregate base course, as developed by using an elastic layer approach, is shown to be in close agreement with a theoretical model (based on Westergaard's assumptions for rigid pavements), which has been found to explain reasonably well the field behavior of unreinforced and fiber-reinforced concrete slabs on grade. Finally, a preliminary cost analysis demonstrated that the use of stabilized recycled aggregate instead of a standard crushed stone base course can result in a meaningful economic savings.
Author: Mohammad Saeed Pourtahmasb
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 392
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Book Description
Author: Paul Cancino
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 0
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Author: Subhasis Pradhan
Publisher: Springer Nature
ISBN: 9819975166
Category :
Languages : en
Pages : 288
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Book Description
Author: Alan D. Buck
Publisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 50
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Book Description
Supplies of natural mineral aggregates are diminishing as their usage increases. Disposal problems exist because of steadily increasing accumulation of solid wastes. In light of these two situations an investigation was made to evaluate the use of crushed waste concrete as concrete aggregate. If such use is practical, it will help to alleviate both problems. A discarded concrete driveway that contained siliceous aggregates and a laboratory concrete beam that contained limestone as coarse aggregate and natural siliceous sand as fine aggregate were selected. Portions of each kind of concrete were processed into aggregate sizes. Three test mixtures and two control mixtures were made. Specimens from each round of each mixture were tested for compressive strength at different ages up to six months, for resistance to accelerated freezing and thawing, and for volume changes due to temperature changes or to moisture effects at a constant temperature. The aggregate particles produced by crushing concrete had good particle shape, high absorption, and low specific gravity by comparison with conventional natural mineral aggregates. Other results revealed that use of crushed concrete as aggregate (a) had no significant effect on mixture proportions or workability, (b) resulted in slightly lower compressive strengths, (c) had no significant effect on volume response of specimens to temperature or moisture effects, and (d) resulted in a significant increase in frost resistance when the crushed driveway concrete was used, but essentially no effect on frost resistance when the crushed beam was used.
Author: Farhad Reza
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 195
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Book Description
The need to consider sustainability in design dictates that materials should be recycled and reused whenever possible. The Minnesota Department of Transportation (MnDOT) is quite progressive in allowing the use of recycled aggregates in new construction. While the use of recycled concrete aggregate (RCA) in the base course of new pavements is quite common in Minnesota and many other states, it is rarely used in the concrete pavement itself. In fact, Minnesota was one of the few states to build multiple trial projects and has one of the largest number of concrete pavements constructed using the RCA in the concrete itself. The performance of those pavements, most of which are still in service, has never been formally evaluated against similar conventional concrete pavements. This prompted the current research study. Additional objectives were to assess the current state of practice across the nation, conduct experimental investigations using RCA in concrete, assess the sustainability and in particular the economics of using RCA in concrete, and finally to provide some recommendations for guidelines on using RCA in concrete. It has been shown by the authors and other researchers that it is possible to create strong and durable concrete mixtures using RCA as coarse aggregate in volume replacement levels of natural coarse aggregate up to 100%.
