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From page 24... ...
AASHTO T 255, Standard Method of Test for Total Evaporable Moisture Content of Aggregate by Drying. This test method covers the determination of the percentage of evaporable moisture in a sample of aggregate by drying both surface moisture and moisture in the pores of the aggregate.
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From page 25... ...
This test method can be used to test AC mixtures in conjunction with mixture design testing to determine the potential for moisture damage, to determine whether or not an antistripping additive is effective, and to determine what dosage of an additive is needed to maximize the effectiveness. This test method can also be used to test mixtures produced in plants to determine the effectiveness of additives under the conditions imposed in the field.
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From page 26... ...
― 2013 Design Manual – bases; asphalt pavements; Chapter 52 Pavement and incidental construction Underdrain Design (shoulder drains) ; and Elements.
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From page 27... ...
. Kentucky TC Aggregate base courses Pavement cross-sections ― (pavement drainage (edge drain, daylight blanket, geogrid)
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From page 28... ...
, and Engineered Granular materials. Mixes; Comprehensive Pavement Design Manual, Chapter 9 – Subsurface Pavement Drainage.
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From page 29... ...
; and materials. Wisconsin DOT Bases and subbases (open- Edge drains Facilities Development graded base)
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From page 30... ...
This e-circular contains papers based on a Sunday workshop at the 92nd Annual Meeting of the TRB in Washington, DC, on enhancing the durability of asphalt pavements. The workshop focused on new design and construction approaches for extending pavement life while also improving their sustainability.
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From page 31... ...
This interactive program allows the pavement design engineer to select values for the critical design parameters. The program then predicts the water film thickness along the line of maximum flow and determines the hydroplaning potential along the flow path.
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From page 32... ...
Information is provided on the maintenance of edge drains, its relation to pavement drainage and performance, and the importance and cost benefits of providing good drainage in highways. Information for the synthesis was collected by surveying US and Canadian transportation agencies and by conducting a literature search to document North American and European practices.
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From page 33... ...
The digest is organized in the following sections: Background; Controversy Over Subsurface Drainage; Key Questions Addressed; Data Collected in Project 1-34 and Data Obtained from Other Sources; Analyses Conducted; Effects of Subsurface Drainage on Flexible Pavements; Effects of Subsurface Drainage on Rigid Pavements; Findings for Retrofitted Edge drains; Cost Effectiveness Findings; Discussion of Findings; and Limitations of Findings. Two tables are included showing, respectively, a summary of AC pavement sections analyzed, and a summary of PCC pavement sections analyzed.
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From page 34... ...
12 incorporates new design charts and procedures developed from laboratory tests of interception capacities and efficiencies of highway pavement drainage inlets. A chart for the solution of the kinematic wave equation for overland flow and a new chart for the solution of Manning's equation for triangular channels are provided.
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From page 35... ...
Edge drains consist of pipes that run along the length of a road to remove moisture from the granular base of the road system. The pipes are placed in a high permeability gravel trench below the shoulder/road surface.
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From page 36... ...
2014. "Impact of Mix Design on Asphalt Pavement Durability." Enhancing the Durability of Asphalt Pavements.
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From page 37... ...
http://www.ucprc.ucdavis.edu/PDF/UCPRC-SR-2005-01.pdf. Moisture damage in asphalt pavements is a complex phenomenon affected by a variety of factors, and has not been fully understood, with major knowledge gaps in three areas: major factors contributing to moisture damage in the field, appropriate laboratory test procedures, and the effectiveness of treatments.
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From page 38... ...
This article explains how moisture damage in asphalt pavements is caused by adhesive failure between the asphalt film and aggregate or cohesive failure within the asphalt binder itself. The author writes that construction practices that trap moisture in pavement layers, such as a high air void content mix placed between low air void content lifts or placing a chip seal over a moisture sensitive pavement, can create moisture damage.
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From page 39... ...
http://onlinepubs.trb.org/onlinepubs/conf/reports/moisture_seminar.pdf. Moisture damage in asphalt pavements is a national concern.
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From page 40... ...
TSRs of high RAP content mixtures as measured by AASHTO T 283 were comparable to those of control mixtures without RAP, indicating similar moisture damage susceptibilities. As might be expected, compared to control mixtures without RAP, the high RAP content mixtures generally had lower fracture energies at test temperatures used to evaluate susceptibility to fatigue and low-temperature cracking.
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From page 41... ...
Asphalt pavements with delamination problems experience considerable early damage because delaminations provide paths for moisture damage and the development of damage such as stripping, slippage cracks, and pavement deformation. Early detection of the existence, extent, and depth of delaminations in asphalt pavements is key for determining the appropriate rehabilitation strategy and thus extending the life of the given pavement.
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From page 42... ...
Although much research has been performed in the United States and abroad on the materials, techniques, and designs for crack sealing and crack filling, variability in the current state-of-the-practice regarding construction techniques and the resulting effectiveness of crack sealing and crack filling have not been investigated. The objective of NCHRP Project 20-07/Task 339 was to identify current best practices for crack sealing and crack filling of asphalt pavements.
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From page 43... ...
Overlay thickness and mix design methods for resisting stripping are the important factors for extending the life of a rehabilitated stripped asphalt pavement. Transportation Research Board.
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