Download or read book 1997 HBP QC for Pay Pilot Projects with Void Acceptance written by Bud A. Brakey and published by . This book was released on 1998 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book HBP Pilot Void Acceptance Projects in Region 2 in 1997 written by Bud A. Brakey and published by . This book was released on 1998 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summaries and analyses of three Void Acceptance (VA) projects are reported and compared with previous VA and quality assurance and quality control (QA & QC) projects. For two of the three projects, the voids filled with asphalt (VFA) averaged 77% (design criteria was 65-75%) and percent air voids (AV) averaged 3.2% (design target was 4.0%). Because compacted bulk specific gravity field tests were higher than lab-mixed design values, for all processes, field AV and voids in mineral aggregate (VMA) averaged 0.4% below design values. VMA was easily met after field targets were adjusted.
Download or read book HBP Pilot Void Acceptance Projects Completed in 1993 1996 written by Bud A. Brakey and published by . This book was released on 1997 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1993, the Colorado Department of Transportation (CDOT) recognized that specifying HBP volumetric properties would likely provide superior pavements. A long range goal was set for acceptance to be based on voids properties. Beginning in 1993, a series of void acceptance (VA) pilot projects were let to contract; by the end of 1996, nine had been completed. Six had conventional mix designs. The last three were designed using Superpave technology. The data for the nine VA projects are summarized and compared with data from concurrent CDOT projects under Quality Level Analysis (QLA).
Download or read book Cracking in Bridge Decks written by Pui-shum B. Shing and published by . This book was released on 1999 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the findings of a study whose primary objectives are to determine the cause of extensive transverse cracking that has been observed in some existing bridge decks, and to identify the change of material specifications and construction practice that is necessary to reduce the severity of deck cracking. To achieve these goals, recent studies on the cause of bridge deck cracking were reviewed, an experimental study was conducted to compare the shrinkage properties of different concrete mixes, and the current material and design specifications and construction practice adopted by the Colorado Department of Transportation (CDOT) were reviewed to identify areas that need improvement. A survey was conducted on seven newly constructed bridges to examine the extent of cracking in concrete decks that were constructed with the different mix designs and curing procedure that were currently used by CDOT.
Download or read book Estimating Link Travel Time on I 70 Corridor written by Sarosh I. Khan and published by . This book was released on 2000 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report represents the findings of a study that demonstrates the feasibility of estimating link travel time and speed in real-time for rural, mountainous sections of interstate freeway in Colorado using vehicles instrumented with global positioning system (GPS) receivers, serving as probes in traffic streams. The system configuration developed includes a cost-effective, portable GPS deployment unit, communication links to a server PC and an integrated prototype system for vehicle tracking and estimating link travel time statistics. This study was carried out in two phases. The objective of the first phase was to identify a cost-effective means of monitoring traffic within a rural, mountainous stretch of the I-70 freeway. An algorithm was developed to estimate average link speed, travel time and the standard error of estimates to provide user information on the reliability of the estimates based on the probe data. The algorithm was tested for different traffic conditions and geometric characteristics of links. In the second phase of the project, a real-time demonstrational prototype was developed to receive, process and estimate link travel time and speed statistics in real-time. The system was tested off-line and on-line based on field data received from the I-70 corridor. In addition, GPS receivers were deployed using a commercial vanpool service and the system was evaluated further.
Download or read book PCCP Texturing Methods written by Ahmad Ardani and published by . This book was released on 2000 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Calculation of Bridge Pier Scour Using the Erodibility Index Method written by George Annandale and published by . This book was released on 2001 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report explains the use of the Erodibility Index Method (also known as Annandale's Method) to calculate bridge pier scour. The method can be used to predict scour in any earth material, including rock and cohesive and noncohesive soils. Earth material properties are represented by a geo-mechanical index that integrates the role of material mass strength, block/particle size, internal shear strength and orientation in quantifying the relative ability of earth material to resist scour. A relationship between the geo-mechanical index and the erosive power of water defines the scour threshold that is used in the scour calculations. By comparing the erosive power that is required to scour an earth material (obtained from the threshold relationship) with the erosive power that is available at the base of a bridge pier, it is possible to calculate scour depth. The report outlines the methods that are used to quantify the geo-mechanical index and those that are used to estimate the erosive power of water flowing around bridge piers, and explains how to calculate scour depth. Application of the method is illustrated with an example.
Download or read book Hot Bituminous Pavement QC QA Projects Constructed in 1997 Under QPM 2 Specifications written by Bud A. Brakey and published by . This book was released on 1998 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Review of the Public Private Initiatives Program of the Colorado Department of Transportation written by Porter K. Wheeler and published by . This book was released on 2000 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report assesses the current Public-Private Initiatives (PPI) program from the perspective of all participants and incorporates best practices from other states. Section 2 summarizes innovative finance. The current PPI program and processes are reviewed in section 3. In section 4 the best practices of selected PPI programs in other states and jurisdictions are examined. In section 5 the recommendations for the Colorado Department of Transportation's considerations are presented in the key areas of policy/legal, process, and management.
Download or read book Evaluation and Comparison of Three Chemical Deicers for Use in Colorado written by William M. Lewis (Jr.) and published by . This book was released on 2001 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Cost benefit Evaluation Committee written by Timothy Aschenbrener and published by . This book was released on 2001 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this evaluation was to document a cost-benefit evaluation of the 3-year warranty specification and projects for hot bituminous pavements (HBP). There were 6 warranty projects evaluated that included 3 projects whose warranty terms had expired. Each warranty project was compared to a comparable non-warranted project.
Download or read book Noise and Skid Measurements on US285 in the Turkey Creek Canyon Area written by Robert LaForce and published by . This book was released on 2001 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the noise measurements taken using a single vehicle on four different pavement surface textures. The pavements were located on US285 southwest of Denver, Colorado. Noise measurements were taken inside the vehicle, 25 ft from the center of the closest driving lane, and near the right rear tire. Skid testing was performed at 40 mph in conformance with the American Society for Testing and Materials procedure E 274 for a ribbed tire. The surface types included longitudinal tined concrete, transverse tined concrete, ground concrete, and an asphalt surface (3/8 in. nominal Stone Mastic Asphalt).
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.
Download or read book Using RTD s Transit Vehicles to Develop Freeway Speed Maps for Colorado written by Sarosh Khan and published by . This book was released on 2004 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Improvements to Mobility Performance Measure Calculations written by BRW Inc and published by . This book was released on 2000 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This current report presents research findings and recommendations for improving several mobility performance measure data collection sources and measurement estimation techniques. Major sections of the report address criteria to report statewide congestion, required enhancements to the existing CDOT travel data collection and analysis system, short-term improvements, and long-term improvements.
Download or read book Long range Cost Estimation Research Project written by and published by . This book was released on 2000 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
