Determining The Degree Of Aggregate Degradation After Using The Ncat Asphalt Content Tester
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Determining The Degree Of Aggregate Degradation After Using The Ncat Asphalt Content Tester
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Author : Randolph Reyes
language : en
Publisher:
Release Date : 1997
Determining The Degree Of Aggregate Degradation After Using The Ncat Asphalt Content Tester written by Randolph Reyes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Aggregates (Building materials) categories.
The purpose of the research conducted was to determine if aggregate degradation takes place and to measure the possible degree of degradation after bituminous mixtures are heated inside the NCAT Asphalt Content Tester. A study was conducted which compared the original aggregate blend (control specimens) to the residual aggregate blend (experimental specimens) obtained after several bituminous mixtures were heated inside the NCAT Asphalt Content Tester. The control specimens and the experimental specimens used to produce the bituminous mixtures were the result of an aggregate sample which was split three times. Two methods of analysis were used to review the gradation results.
Using Ignition Ovens To Determine Asphalt Content And To Prepare Aggregates For Sieve Analysis
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Author : Robert E. Lee
language : en
Publisher:
Release Date : 1996
Using Ignition Ovens To Determine Asphalt Content And To Prepare Aggregates For Sieve Analysis written by Robert E. Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Aggregates (Building materials) categories.
The Materials and Tests Division's Bituminous Section evaluated the ignition method as an alternative to the solvent method for determining asphalt content. Three ovens (the Gilson Asphalt Binder Ignition Furnace, Model HM 378; the NCAT Asphalt Content Tester; and the Troxler Asphalt Quality Analyzer) were evaluated for accuracy, precision, and performance. Ignition was proven to be an appropriate method of determining asphalt content. The test procedure resulting from this work is Tex-236-F, which is included in Appendix A.
Sampling Location Impact On Measured Asphalt Content Of Hot Mix Asphalt
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Author : Mohammad Abu-Hassan
language : en
Publisher:
Release Date : 2002
Sampling Location Impact On Measured Asphalt Content Of Hot Mix Asphalt written by Mohammad Abu-Hassan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Pavements, Asphalt categories.
In May 2000, the Colorado Department of Transportation (CDOT) requested a forensic study of a project located on I-24 north of Denver. The request was made because, within a year of the 1997 overlay, longitudinal cracking appeared in the surface. Transverse cracks were attributed to reflective cracking. However, the longitudinal cracks appeared to be surface initiated. In October 2000, a forensic team reviewed the project and established a sampling and testing plan to take cores from the roadway. Based on data analysis of the cores, the higher than expected in-place air voids, the low effective asphalt, and segregation within the mat, all contributed to the early cracking.
Improving Colorado Transportation Through Investigation And Innovation
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Author : Beth Moore
language : en
Publisher:
Release Date : 1999
Improving Colorado Transportation Through Investigation And Innovation written by Beth Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Transportation categories.
Summary of current research studies.
Performance Evaluation Of Various Corrosion Protection Systems Of Bridges In Colorado
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Author : Yunping Xi
language : en
Publisher:
Release Date : 2004
Performance Evaluation Of Various Corrosion Protection Systems Of Bridges In Colorado written by Yunping Xi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Concrete bridges categories.
Corrosion of reinforced concrete structures has been a significant problem for many state and transportation agencies since the application of deicing salts was introduced. Much research has been conducted to develop corrosion protection systems that can prolong the life span of reinforced concrete structures. The Colorado Department of Transportation (CDOT) has several routine and experimental measures to prevent corrosion of the rebar including epoxy-coated rebar, calcium nitrite admixture, organic corrosion inhibitors, a thick cover of quality concrete, and a waterproofing membrane covered by an asphalt overlay. An extensive literature review was performed to collect information on various corrosion protection systems that have been used in the U.S. and around the world. Current CDOT practices in terms of corrosion protection measures were reviewed. A draft inspection plan for Colorado's bridge structures was proposed.
Particulate Matter From Roadways
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Author : Chatten Cowherd
language : en
Publisher:
Release Date : 1998
Particulate Matter From Roadways written by Chatten Cowherd and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Air categories.
Paved roads constitute a major category of PM-10 and PM-2.5 emissions in urban areas. Paved roadway resuspension processes emit antiskid materials, abraded pavement particles, rubber tire fragments, and dirt that is tracked from unpaved areas. In the Denver area, exceedances of the PM-10 standard in late winter and early spring are related to residual road sand loadings from wintertime antiskid controls. This report presents the results of research, sponsored by the Colorado Department of Transportation, to (a) determine the relationships between the paved roadway surface dust characteristics and fine particle emissions, and (b) evaluate emission control measures that reduce road surface silt loadings (either by preventive or mitigative means). Several types of field studies were used in performing this research. The Correlation Studies entailed simultaneous paved road plume profiling and road surface material sampling at three test sites in the Denver metropolitan area. The composition of collected airborne and surface samples were analyzed by chemical and microscopic analysis. The upwind/downwind airborne particulate matter samples that were selected for analysis included PM-10 and PM-2.5, while the road surface samples included the resuspended PM-10 and PM-2.5 from Midwest Research Institute's Dustiness Test Chamber. The Correlation Studies demonstrated that emission control effectiveness for the paved road resuspension processes can be evaluated in terms of reductions of roadway surface material loadings. Additional composite surface sampling of Denver arterial roadways compared the effects of winter sanding and alternative chemical deicers on surface loadings.
Preliminary Environmental Evaluation Of Caliber M1000 Deicer For Use In Colorado
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Author : William M. Lewis
language : en
Publisher:
Release Date : 2000
Preliminary Environmental Evaluation Of Caliber M1000 Deicer For Use In Colorado written by William M. Lewis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Deicing chemicals categories.
Pccp Texturing Methods
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Author : Ahmad Ardani
language : en
Publisher:
Release Date : 2000
Pccp Texturing Methods written by Ahmad Ardani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Pavements categories.
This report presents a 5-year evaluation and construction details of nine test sections with varying textural characteristics. Included in the report is an overview of the methodologies used to texture concrete pavement surfaces and a discussion of frictional attributes of various textures at different speeds and their impact on noise properties. Also included in the report are descriptions of texture-measuring devices and texture-installing equipment, a description of the state-of-the-art equipment used to acquire sound pressure levels, plus a thorough discussion of data acquisition/analysis. Frictional characteristics of the individual test sections were evaluated using the ASTM E 274 skid testing procedure.
Long Range Cost Estimation Research Project
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Author :
language : en
Publisher:
Release Date : 2000
Long Range Cost Estimation Research Project written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Highway engineering categories.
The purpose of this project was to research long-range (parametric) cost estimation at the Colorado Department of Transportation (CDOT), utilizing AASHTO's Trns.port Cost Estimation and Decision Support software. Info Tech, Inc., analysis reviewed CDOT's current long-range estimation practices and identified revisions which would be needed to satisfactorily meet CDOT's future cost estimating requirements, i.e., in order to develop consistent and reliable cost estimates when little is known about a project. Both item and contract classifications utilized by CDOT in BAMS/DSS were revised to reflect more logical functional groupings. The new contract work type and item classification were used directly to develop an Interim Solution for Long-Range Cost Estimation that uses historical bid-based default prices. Info Tech analysts also researched Internet sources to identify the availability of major item cost data at the regional and national level, including data for multimodal project types.
Effects Of Geometric Characteristics Of Interchanges On Truck Safety
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Author : Bruce N. Janson
language : en
Publisher:
Release Date : 1999
Effects Of Geometric Characteristics Of Interchanges On Truck Safety written by Bruce N. Janson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Roads categories.