Hbp Pilot Void Acceptance Projects In Region 2 In 1997
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| Author | : Bud A. Brakey |
| Publisher | : |
| Total Pages | : 98 |
| Release | : 1998 |
| Genre | : Pavements, Bituminous |
| ISBN | : |
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.
| Author | : Bud A. Brakey |
| Publisher | : |
| Total Pages | : 90 |
| Release | : 1998 |
| Genre | : Pavements, Bituminous |
| ISBN | : |
| Author | : Pui-shum B. Shing |
| Publisher | : |
| Total Pages | : 182 |
| Release | : 1999 |
| Genre | : Concrete |
| ISBN | : |
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.
| Author | : Bud A. Brakey |
| Publisher | : |
| Total Pages | : 60 |
| Release | : 1998 |
| Genre | : Pavements, Bituminous |
| ISBN | : |
| Author | : Donna S. Harmelink |
| Publisher | : |
| Total Pages | : 120 |
| Release | : 2001 |
| Genre | : Pavements |
| ISBN | : |
This report documents the construction and performance of the Colorado Department of Transportation's (CDOT's) first two Stone Mastic Asphalt (SMA) projects. The first project, located on SH 119 from SH 52 to Longmont, contained three SMA mixes, two polymer-stabilized mixes and one fiber mix. This project successfully demonstrated the design, production and placement of SMA. The second project located on the Colfax Viaduct in Denver was CDOT's first attempt to use SMA on a bridge deck. This project used a polymer-stabilized mix. This project successfully demonstrated the placement of SMA on a bridge deck. SMA is currently being used as a wearing surface in Colorado. Guidelines and a best practice guide have been developed and have been adopted for statewide use. In addition, CDOT's Bridge Branch has developed a specification for using SMA as part of the overlay system.
| Author | : Donna S. Harmelink |
| Publisher | : |
| Total Pages | : 136 |
| Release | : 2002 |
| Genre | : Pavements, Asphalt |
| ISBN | : |
In 1995, the Colorado Department of Transportation implemented the Superpave gyratory mix design to select the optimum asphalt content of a mixture. The optimum asphalt content was not the same as what the department had historically used. The purpose of this study was to gather data to validate the number of gyrations that should be used with the Superpave mix design. Based on the data gathered from the 25 evaluation sections, the optimal number of design gyrations for the Field Mixed/Lab Compacted material is too high. Mixes appear to be too stiff for the traffic and environmental conditions.
| Author | : Sarosh I. Khan |
| Publisher | : |
| Total Pages | : 148 |
| Release | : 2000 |
| Genre | : Travel time (Traffic engineering) |
| ISBN | : |
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.
| Author | : Robert LaForce |
| Publisher | : |
| Total Pages | : 52 |
| Release | : 2001 |
| Genre | : Pavements |
| ISBN | : |
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).
| Author | : Sarosh Khan |
| Publisher | : |
| Total Pages | : 148 |
| Release | : 2004 |
| Genre | : Global Positioning System |
| ISBN | : |
| Author | : Yunping Xi |
| Publisher | : |
| Total Pages | : 166 |
| Release | : 2004 |
| Genre | : Concrete bridges |
| ISBN | : |
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.
