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Author : Metro Mix Design Task Force
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (33 download)
Download or read book Denver Metropolitan Area Asphalt Pavement Mix Recommendations written by Metro Mix Design Task Force and published by . This book was released on 1994* with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Colorado Asphalt Pavement Association. Metro Mix Design Task Force
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.3/5 (555 download)
Download or read book Denver Metropolitan Area Asphalt Pavement Mix Design Recommendations written by Colorado Asphalt Pavement Association. Metro Mix Design Task Force and published by . This book was released on 1994 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been estimated that over 60 asphalt mix designs are being specified by the various local governments and design consultants in the Denver metropolitan area. As material batches are ordered for delivery to these various agencies, the producers are required to constantly change their mixing formulations and plant operations. This constantly changing process results in inefficiencies in production time and cost to the buyer, as well as variability in the process. The problem is intensified when towns and communities order small amounts of material for a local street project. In March, 1994 a Government Forum was held in conjunction with the annual meeting of the Colorado Asphalt Pavement Association. At this forum, a decision was made to organize a Task Force to address this problem and provide recommendations for asphalt paving materials in the Denver Metropolitan area. This report presents the recommendations of that Task Force. The recommendations include gradation, asphalt cement type, additives, RAP, voids, and laboratory design properties. Four standard mixes were identified.
Author : Timothy Aschenbrener
Publisher :
ISBN 13 :
Total Pages : 148 pages
Book Rating : 4.3/5 (555 download)
Download or read book High Performance Hot Mix Asphalt Pavements for Intersections written by Timothy Aschenbrener and published by . This book was released on 1995 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: A program has begun in Colorado to prove that HMA pavements can be effectively constructed at intersections and provide significant benefits to the owner. To many highway agencies, performance, construction speed, and cost are the three key issues to consider when rehabilitating or reconstructing high traffic intersections. Therefore, demonstration projects were organized by the Colorado Asphalt Pavement Association (CAPA) to demonstrate performance, construction speed and cost advantages over PCC pavements at high traffic intersections in Colorado. This paper documents the planning, design, and construction processes that were followed to successfully build an HMA pavement at an intersection carrying over 7.7 million 18 kip (8200 kg) ESALs for a 20-year design.
Author : Donna S. Harmelink
Publisher :
ISBN 13 :
Total Pages : 110 pages
Book Rating : 4.:/5 (1 download)
Download or read book Using Ground Tire Rubber in Hot Mix Asphalt Pavements written by Donna S. Harmelink and published by . This book was released on 1999 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Documents the construction and performance of the research study which was initiated to address section 1038(d) of the 1991 Intermodal Surface Transportation Efficiency Act (ISTEA). The project selected to demonstrate the crumb rubber process was located on Platt Canyon (SH 75) from Bowles to C470 in the Denver metropolitan area. The project was a low volume roadway and quantities of crumb rubber introduced into the mix were minimal. This was to reduce risk in terms of premature failure and Colorado's limited experience with crumb rubber. Because of this limited experience, the "dry" process was selected. The project contained four different mix designs. A mix containing 1% [20 lb/ton (10 kg/Mg)] crumb rubber, a mix containing 1 lb/ton (0.5 kg/Mg), a mix containing 3 lb/ton (1.5 kg/Mg) and a mix which contained no rubber were placed on the project.
Author : University of Colorado at Denver. Center for Urban Transportation Studies
Publisher :
ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (137 download)
Download or read book Asphalt Paving Mixtures written by University of Colorado at Denver. Center for Urban Transportation Studies and published by . This book was released on 1986 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yunping Xi
Publisher :
ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.3/5 (555 download)
Download or read book Performance Evaluation of Various Corrosion Protection Systems of Bridges in Colorado written by Yunping Xi and published by . This book was released on 2004 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Ardani Ahmad
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (1 download)
Download or read book Long-term Performance of Accelerated Rigid Pavements, Project CXMP 13-0006-07 written by Ardani Ahmad and published by . This book was released on 1996 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the post-construction evaluation of the fast track pavement in Sterling, Colorado. The field evaluation consisted of visual inspection, fault measurement, profile measurement and distress survey. A set of falling weight deflectometer (FWD) measurements was also acquired to assess the structural responses and to evaluate load transfer efficiency between the slabs. The results of this study demonstrated that fast track concrete can be as durable as the conventional concrete pavement. After seven years of being in service the pavement has shown no sign of fatigue, only some minor distresses unrelated to fast track techniques.
Author : Randolph Reyes
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.3/5 (555 download)
Download or read book Determining the Degree of Aggregate Degradation After Using the NCAT Asphalt Content Tester written by Randolph Reyes and published by . This book was released on 1997 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Sarosh I. Khan
Publisher :
ISBN 13 :
Total Pages : 316 pages
Book Rating : 4.3/5 (555 download)
Download or read book Common Performance Measures Practitioner's Guidebook written by Sarosh I. Khan and published by . This book was released on 1999 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guidebook presents a methodology that uses performance measures common to various transportation modes to perform simplified corridor/project analyses. Evaluation of performance across alternatives and modes is done through a series of manual worksheets by applying an approach based on five core areas including measures of mobility, agency cost, safety, user costs, and air quality. The evaluation can be limited to an analysis based on measures of effectiveness (MOE) or completed to include a measure of economic efficiency. To calculate the measures for each of the core areas, the analyst must describe the corridor or project to be analyzed, conceptualize the alternatives to be examined, collect baseline data pertinent to those alternatives and the chosen analysis framework, and aggregate the corridor into logical segments. For cases where some local data are unavailable, the guidebook includes a series of reference tables with default and average values for variables and parameters involved in the evaluation. After the MOEs under the baseline, No-build, and alternative conditions for each analysis year are summarized, the analyst can employ a multi-criteria ranking approach to select the best alternative action based on performance measures or perform an economic efficiency analysis.
Author :
Publisher :
ISBN 13 :
Total Pages : 720 pages
Book Rating : 4.:/5 (334 download)
Download or read book Accessions Checklist, Colorado State Publications written by and published by . This book was released on 1995 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Donna S. Harmelink
Publisher :
ISBN 13 :
Total Pages : 190 pages
Book Rating : 4.:/5 (1 download)
Download or read book Demonstration of the Placement of Stone Matrix Asphalt in Colorado written by Donna S. Harmelink and published by . This book was released on 1995 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ahmad Ardani
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.3/5 (555 download)
Download or read book Evaluation of Design Build Practice in Colorado, IR(CX)70-4(143) written by Ahmad Ardani and published by . This book was released on 1999 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This final report summarizes the activities that took place on a design-build project in Region I of the Colorado Department of Transportation (CDOT). Under the Special Experimental Project No. 14 (SEP 14), the Federal Highway Administration approved the design-build concept to be used for the 12 mi (19.3 km) reconstruction of I-70 east of Denver. Included in this report are an overview of the design-build concept, discussion of significant events, and results of a questionnaire on design-build methodology. Also included in the report are a description of all the construction modification orders (CMO) and a discussion of quality control/quality assurance processes. The ultimate goal of this study was to identify and document the pros and cons of the design-build practice and to examine its overall applicability to CDOT.
Author : Bud A. Brakey
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.:/5 (1 download)
Download or read book Hot Bituminous Pavement QC&QA Projects Constructed in 1996 Under QPM 2 Specifications written by Bud A. Brakey and published by . This book was released on 1997 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents Tables and Figures which summarize the HBP Quality Level Analysis (QLA) for projects completed in 1996, the second season using the latest significant revision to the specifications. The quality Level (QL) for the elements (sieve analysis, asphalt content, and pavement density) and the item composites are summarized. While QL determines Pay Factor (PF), it is also used to rank contractors' performance. The item QL improved 1.3 percentage points in 1996 over 1995. But the incentive/disincentive payments were not sufficient to cause some of the contractors to improve their process control. Both, the better and porrer performing contractors show up with similar rankings from year to year. The QLA specifications essentially are serving satisfactorily. Implementation: The PF formulas were modified for the 1997 season so as to make the pF continuous in relation to the QL, rather than in steps as has been the procedure. It is suggested the methods of applying weight factors to the element QL's for PF calculations be reviewed for possible changes. Some other changes in the specification and computer software are needed.
Author : Bruce N. Janson
Publisher :
ISBN 13 :
Total Pages : 106 pages
Book Rating : 4.3/5 (555 download)
Download or read book Dynamic Traffic Modelling of the I-25/HOV Corridor written by Bruce N. Janson and published by . This book was released on 1995 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traffic modelling is one means of being able to predict time-varying traffic conditions in an urban roadway network to support traveler information systems and traffic management advisories. The development and testing of DYMOD (a dynamic traffic assignment model) was implemented in the Denver metro area to predict observed volumes and speeds during a typical weekday peak period (5am - 10am). On average, predicted flows agreed to within 12% of actual 5-minute volumes on I-25 through lanes at the detector locations. DYMOD was also able to model incident conditions to generate route diversion planning strategies during lane blocking accidents and to estimate vehicle hours of delay.
Author : William M. Lewis
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (1 download)
Download or read book Preliminary Environmental Evaluation of Caliber M1000 Deicer for Use in Colorado written by William M. Lewis and published by . This book was released on 2000 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Arthur I. Mears
Publisher :
ISBN 13 :
Total Pages : 132 pages
Book Rating : 4.:/5 (1 download)
Download or read book Avalanche Hazard Index for Colorado Highways written by Arthur I. Mears and published by . This book was released on 1995 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study conducted an inventory of existing avalanche paths along Colorado Highways. Information was collected on the size and type of each avalanche path, the historical frequency of avalanche occurrences, the number of avalanche tracks, the length of highway exposed, the volume of traffic on the road, the traffic peak characteristics, the speed of traffic and the consequences of an avalanche encounter with a vehicle. This information was used to generate an Avalanche Hazard Index (AHI) for Colorado Highways. The concept of the AHI has been used in the past as a quantitative measure of the avalanche hazard to traffic. The AHI values calculated in this study are considered relative values and can be used to compare the hazards of particular avalanche paths or avalanche prone routes in Colorado.
Author : Louis Franklin Cohn
Publisher :
ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.3/5 (555 download)
Download or read book Reference Energy Mean Emission Levels Used in STAMINA 2.0 for Highway Noise Prediction in the State of Colorado written by Louis Franklin Cohn and published by . This book was released on 1995 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the test done on noise emission levels found on vehicles in Colorado. It justifies modifications of the STAMINA 2.0 traffic noise prediction model for use in Colorado. Vehicle noise emission measurements were made in accordance with FHWA Report No. DP-45-1R. It was determined that STAMINA 2.0 (with FHWA default emission rates) over predicts the noise levels by approximately 4 dBA and that adjustments to the emission rates in the model should be made. Based on this study CDOT was allowed by FHWA to change the emission rates in STAMINA 2.0. This change in the model has reduced the cost of noise mitigation by reducing height and extent of noise barriers.
