Feasibility of Using Recycled Concrete Aggregate in Dense-graded and Gap-graded Hot Mix Asphalts PDF Download
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Author: Mohammad Saeed Pourtahmasb
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 392
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Book Description
Author: Mohammad Saeed Pourtahmasb
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 392
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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:
Publisher: Transportation Research Board
ISBN: 0309155649
Category : Asphalt concrete
Languages : en
Pages : 285
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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: H. Fred Waller
Publisher: ASTM International
ISBN: 0803118813
Category : Asphalt emulsion mixtures
Languages : en
Pages : 304
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Book Description
In light of requirements that rubber be mixed with any asphalt used in projects receiving federal aid beginning in 1994, and the general increase in the problem of what to do with waste material, 17 papers from a December 1992 symposium in Miami discuss some of the technical and economic considerati
Author:
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 46
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Book Description
This research was focused on evaluating the feasibility of using minimally processed reclaimed asphalt pavement (RAP) as aggregate replacement in concrete pavements. An initial phase of research demonstrated that concretes with up to 50 percent of the fine aggregates and 100 percent of the coarse aggregates replaced with RAP were suitable for concrete pavement. However, the field performance of these mixes was not evaluated. Further, these initial mixes contained a significant proportion of cement in order to achieve the desired performance criteria, hindering the economic benefit of using this recycled material in concrete. Therefore, the research discussed herein focused on: (1) evaluating the field performance of RAP concrete through a field demonstration project, and (2) reducing the amount of cement required in the RAP concrete by including water-reducing admixtures. As part of the field demonstration project, two RAP-concrete slabs were cast on a roadway near Lewistown, MT, and monitored for damage, shrinkage, and curling over a two-year period. There were no logistical issues associated with the construction of the slabs, and no damage and only minor shrinkage/curling was observed. In regards to the mixture optimization, two modified mix designs with reduced cement contents were developed, and evaluated with a suite of mechanical and durability tests. Mechanical properties tested were compressive and tensile strength, elastic modulus, and shrinkage. Durability tests included abrasion, chloride permeability, freeze-thaw resistance, and scaling. These mixes performed well with respect to all tests, with the exception of the chloride permeability. Although both mixes performed well, the resulting mixes were lean and were difficult to get good consolidation. Moreover, the process for batching these mixes may be considered a hindrance, as it involved slump adjusting the mixes with the water-reducing admixture. This was required because the nature of the RAP aggregates made it difficult to adjust mixes for variations in moisture content.
Author: Freddy L. Roberts
Publisher: National Asphalt Pavement Association
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 516
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Book Description
Author: Martins Zaumanis
Publisher:
ISBN:
Category :
Languages : en
Pages : 328
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Book Description
Abstract: The desire to find more sustainable paving practices as well as the dramatically rising binder costs driven by the growing global demand for paved roads, has led to increased interest of the use of reclaimed asphalt pavement (RAP) in very high amounts. So far the major industry trend has been to develop procedures, invest in technologies and build confidence in mixtures with up to 40 % RAP content. However, a few innovators have refined 100 % recycling technologies over the past four decades to a level where routine production of 100 % recycled hot mix asphalt is in clear sight. Rejuvenators are an integral part of 100 % recycled asphalt production and they can also allow to significantly increase the RAP content for conventionally produced asphalt mixtures. An evaluation of the feasibility of production of 100 % recycled hot-mix asphalt was made and the use of rejuvenators is presented in this study. 100 % recycling is discussed by evaluating ten readily available production technologies along with proposing mix design procedures and identifying best RAP management strategies. A total of eleven different products were evaluated for restoring the RAP binder grade with a definite conclusion that achieving target grade (PG or empirical specification) is possible. In addition a rheological, micromechanical and chemical characterization was performed with select rejuvenators and binders from Strategic Highway Research Program (SHRP) library. To further assess the rejuvenators and feasibility of 100 % RAP recycling a series of 100 % mixture tests were performed that indicated significant improvement in low temperature and fatigue cracking resistance while providing a rut resistant mixture. With the use of some rejuvenators a performance equal to that of reference virgin mix was achieved. Based on these findings of rejuvenator effectiveness a methodology for choice of rejuvenator type and dose was proposed. Finally, a cradle-to-gate analysis of environmental effects was performed which indicated 35 % CO2eq savings per ton of produced 100 % RAP asphalt mixture compared to virgin mix while cost analysis showed at least 50 % savings in material related expenses. A short video summarizing the research is available at http://youtu.be/y-rYvdGiEbY.
Author: Haifang Wen
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 44
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Book Description
Author: J. Paul Guyer, P.E., R.A.
Publisher: Guyer Partners
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 33
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Book Description
Introductory technical guidance for civil engineers and construction managers interested in asphalt concrete pavement for streets and highways. Here is what is discussed: 1. DENSE-GRADED HMA 2. MARSHALL MIX DESIGN 3. MIXTURE CONTROL 4. SIGNIFICANCE OF CHANGES IN MIXTURE PROPERTIES.
