Long Term Performance Of Accelerated Rigid Pavements Project Cxmp 13 0006 07
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| Author | : Ardani Ahmad |
| Publisher | : |
| Total Pages | : 72 |
| Release | : 1996 |
| Genre | : Pavements |
| ISBN | : |
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 | : Beth Moore |
| Publisher | : |
| Total Pages | : 84 |
| Release | : 1999 |
| Genre | : Transportation |
| ISBN | : |
Summary of current research studies.
| 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 | : 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 | : William M. Lewis (Jr.) |
| Publisher | : |
| Total Pages | : 86 |
| Release | : 2001 |
| Genre | : Deicing chemicals |
| ISBN | : |
| 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 | : 60 |
| Release | : 1998 |
| Genre | : Pavements, Bituminous |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 420 |
| Release | : 1998 |
| Genre | : Colorado |
| ISBN | : |
| Author | : Randolph Reyes |
| Publisher | : |
| Total Pages | : 142 |
| Release | : 1997 |
| Genre | : Aggregates (Building materials) |
| ISBN | : |
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 | : David B. Woodham |
| Publisher | : |
| Total Pages | : 52 |
| Release | : 2002 |
| Genre | : Noise barriers |
| ISBN | : |
The purpose of this project was to document the installation of a post-tensioned concrete masonry sound wall constructed as part of a widening and sound wall project along US 36 near Denver, Colorado. In addition, the wall was instrumented at the time of construction to monitor the loss in prestress in the steel tendons over time due to concrete masonry creep and shrinkage and steel relaxation. Tendon tension was monitored for one year to obtain values for the accumulated losses. Accurate losses in post-tensioned concrete masonry are important for economical design. Currently, there are limited data to support an accurate prediction of prestress loss in concrete masonry.
