Hbp Pilot Void Acceptance Projects Completed In 1993 1996
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| Author | : Bud A. Brakey |
| Publisher | : |
| Total Pages | : 92 |
| Release | : 1997 |
| Genre | : Pavements, Bituminous |
| ISBN | : |
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).
| 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 | : David A. Price |
| Publisher | : |
| Total Pages | : 62 |
| Release | : 1998 |
| Genre | : Interstate 76 (Colo. and Neb.) |
| ISBN | : |
Portions of the driving lane on I-76 located in the Colorado Department of Transportation's (CDOT's) Region 4 are seriously distressed. To help prolong the life of the Portland Cement Concrete Pavement Region 4 has placed signs advising truckers to use the passing lane between Roggen and the Nebraska state line [approximately 140 miles (225 km)]. A test section well within the signed test area advising the truckers to use the passing lane and a control section just prior to the signed area were established and evaluated over a four year period. Roughness data taken with an Ames Profilograph, slab faulting measured with a Georgia fault meter, and overall physical pavement distress were noted and used as a comparison between driving lane and passing lane within the two sections.
| 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 | : 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.
| 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 | : William M. Lewis (Jr.) |
| Publisher | : |
| Total Pages | : 86 |
| Release | : 2001 |
| Genre | : Deicing chemicals |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 264 |
| Release | : 2000 |
| Genre | : Highway engineering |
| ISBN | : |
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.
| Author | : Kanop Ketchart |
| Publisher | : |
| Total Pages | : 148 |
| Release | : 1997 |
| Genre | : Bridges |
| ISBN | : |
