› › Construction And Monitoring Of Post Tensioned Masonry Sound Walls

Construction and Monitoring of Post-tensioned Masonry Sound Walls

Author : David B. Woodham

Publisher :

Page : 52 pages

File Size : 50,52 MB

Release : 2002

Category : Noise barriers

ISBN :

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Book Description

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.



Performance Evaluation of Various Corrosion Protection Systems of Bridges in Colorado

Author : Yunping Xi

Publisher :

Page : 166 pages

File Size : 17,68 MB

Release : 2004

Category : Concrete bridges

ISBN :

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Book Description

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.



Structural Masonry Designers' Manual

Author : W. G. Curtin

Publisher : John Wiley & Sons

Page : 357 pages

File Size : 24,36 MB

Release : 2006-07-12

Category : Technology & Engineering

ISBN : 0632056126

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Book Description

This major handbook covers the structural use of brick and blockwork. A major feature is a series of step-by-step design examples of typical elements and buildings. The book has been revised to include updates to the code of practice BS 5628:2000-2 and the 2004 version of Part A of the Building Regulations. New information on sustainability issues, innovation in masonry, health and safety issues and technical developments has been added.



Sampling Location Impact on Measured Asphalt Content of Hot Mix Asphalt

Author : Mohammad Abu-Hassan

Publisher :

Page : 80 pages

File Size : 16,99 MB

Release : 2002

Category : Pavements, Asphalt

ISBN :

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Book Description

In May 2000, the Colorado Department of Transportation (CDOT) requested a forensic study of a project located on I-24 north of Denver. The request was made because, within a year of the 1997 overlay, longitudinal cracking appeared in the surface. Transverse cracks were attributed to reflective cracking. However, the longitudinal cracks appeared to be surface initiated. In October 2000, a forensic team reviewed the project and established a sampling and testing plan to take cores from the roadway. Based on data analysis of the cores, the higher than expected in-place air voids, the low effective asphalt, and segregation within the mat, all contributed to the early cracking.



NBS Special Publication

Author :

Publisher :

Page : 532 pages

File Size : 28,75 MB

Release : 1975

Category : Weights and measures

ISBN :

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Extent of Top-down Cracking in Colorado

Author : Donna S. Harmelink

Publisher :

Page : 64 pages

File Size : 32,11 MB

Release : 2003

Category : Pavements, Asphalt concrete

ISBN :

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Book Description

In 2000, a forensic evaluation was conducted on a project that was exhibiting early longitudinal cracking near the wheel paths. A team of national asphalt experts conducted this forensic evaluation. The forensic team concluded that the cracking on the project was surface initiated cracking and was caused by a number of contributing factors. One of the contributing factors to the early distress that was identified by the experts were the pockets of segregation that were observed at the bottom of the surface lift but were not apparent on the surface. The object of this study was to determine the extent of "top-down cracking" in Colorado, what causes it, how can it be prevented, if it occurs how is the distress treated, and how quickly does the distress need to be treated.



Development of Site-specific ESAL

Author : Sirous H. Alavi

Publisher :

Page : 204 pages

File Size : 19,87 MB

Release : 2002

Category : Pavements

ISBN :

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Book Description

This study was approved by the CDOT's Research Implementation Committee as a high priority research with the goal of improving the accuracy of the existing and forecasted traffic loads of CDOT's highway network. The overall scope of this project involved examination of those resources directly related to the current statewide ESAL classification system and the generation of this final report discussing the research and analysis conducted and recommendation of procedures required for CDOT to develop and implement a more site-specific ESAL classification system. In this study Nichols Consulting Engineers (NCE) analyzed all available CDOT permanent and portable weigh-in-motion (WIM) data.



Corrosion Effects of Magnesium Chloride and Sodium Chloride on Automobile Components

Author : Yunping Xi

Publisher :

Page : 110 pages

File Size : 43,61 MB

Release : 2002

Category : Automobiles

ISBN :

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Book Description

The project consisted of two phases. In the Phase I study, the relative corrosiveness of the two salts [magnesium chloride (MgCl2) and sodium chloride (NaCl)] were examined by SAE J2334 test and ASTM B117 test. In the Phase II study, SAE J2334 test and NACE TM-01-69 test (as modified by the Pacific North States) were applied. Representative metals examined in the project included stainless steel 410 and 304L, aluminum 2024 and 5086, coated automobile body sheets, copper wires, and mild steels.



Cost of Sanding

Author :

Publisher :

Page : 206 pages

File Size : 12,93 MB

Release : 2002

Category : Deicing chemicals

ISBN :

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