Applicability of New Flexible Pavement Smoothness Specification for Asphalt Overlays

1997 ◽  
Vol 1575 (1) ◽  
pp. 18-24 ◽  
Author(s):  
Emmanuel G. Fernando
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Asphalt Concrete ◽  
Surface Preparation ◽  
Flexible Pavement ◽  
Quality Assurance Program ◽  
Ride Quality ◽  
Portland Cement Concrete ◽  
Asphalt Overlays ◽  
Overlay Construction

The Texas Department of Transportation plans to implement smoothness specifications based on profilograph testing for all asphalt concrete paving projects as part of its construction quality control/quality assurance program. Smoothness specifications have been developed for newly constructed asphalt and portland cement concrete pavements. In a move to develop a similar specification for asphalt concrete overlays, the Texas Transportation Institute was asked to evaluate the applicability of the existing flexible pavement smoothness specifications for the quality control and quality assurance of pavement rideability on overlay construction projects. This study was intended to provide the state with the information necessary to evaluate the improvement in ride quality that may be expected from placement of asphalt overlays, particularly for thin overlays [38 to 51 mm (1.5 to 2 in.)], which are generally constructed in Texas. To collect data to determine whether the existing specification can be implemented for overlay construction work, TTI monitored a number of overlay projects during the 1994 calendar year. Profilograph measurements were made during these projects before any surface preparation, after surface preparation, and after placement of the asphalt concrete overlay. All of the projects monitored involved thin overlays. The data collected indicate that the existing smoothness specifications can be implemented on overlay projects, provided that appropriate surface preparations (e.g., milling, level-ups) are conducted to correct existing surface distresses before placement of the overlay.

scholarly journals Constancy tests and quality assurance of the activimeters used in a Radiopharmaceutical Production Unit

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Rodrigo Modesto Gadelha Gontijo ◽  
Andréa Vidal Ferreira ◽  
Leonardo Tafas Constantino Nascimento ◽  
Flávia Mesquita Costa ◽  
Juliana Batista Silva ◽  
...  
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Entire Range ◽  
Quality Assurance Program ◽  
Dose Administration ◽  
Accuracy And Precision ◽  
Background Check ◽  
Linearity Test ◽  
Brazilian Standard ◽  
Equipment Performance

Activimeters (or dose calibrators) are essential instruments to verify activity of radiopharmaceutical after production and also before the dose administration in humans or animals for molecular imaging. The efficiency and safety measurements depend on, beside other factors, constancy tests and quality assurance. Thereby, the aim of this work was to perform constancy tests and quality assurance in the activimeters of the UPPR/CDTN, based on the CNEN-NN 3.05 Brazilian standard and the manufacturer's manual. Physical inspection, auto zero, background check, camera voltage, data check and constancy test were done. In addition, accuracy and precision tests were performed using a set of standard certified radioactive sources (57Co, 133Ba and 137Cs), according to the CNEN NN 3.05 Brazilian standard. Linearity test was also performed to evaluate the response of the equipment in over the entire range of activities used in routine. The equipments are periodically submitted to the quality control tests and the results were compared. After performing the proposed tests it is possible to conclude that activimeters are in accordance with the requirements of the CNEN standard and manufacturer´s manual. A quality control checklist was prepared to guide users and to record the results of quality assurance testing to monitor the equipment performance. This initiative is part of the quality assurance program implemented at UPPR.

scholarly journals Comparison of ergovaline determinations between laboratories in the United States and Japan

2007 ◽  
Vol 13 ◽  
pp. 283-288
Author(s):  
Morrie Craig ◽  
G. Rottinghaus ◽  
K. Walker ◽  
E. Ishikuro
Keyword(s):  
United States ◽  
Quality Control ◽  
Quality Assurance ◽  
Perennial Ryegrass ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
The United States ◽  
Quality Assurance Program ◽  
University Of Missouri ◽  
Keywords Quality Assurance

Quality assurance and quality control is the foundation of any diagnostic test. The two laboratories in the United States that use HPLC to quantitate endophyte toxins in tall fescue (Festuca arundinacea) and perennial ryegrass (Lolium perenne) are Oregon State University (OSU) and University of Missouri (MU). Japan, the major importer of grass straw has six new laboratories that will test agricultural imports for endophyte toxins. A quality assurance program was set up between the Japanese Ministry of Agriculture and the State of Oregon. The latter includes both OSU and the MU. All units are using an accurate crystalline standard and have exchanged "check" samples among themselves. To date OSU and MU have values that differ by 10%. OSU has identified a contaminating and coeluting peak as the cause of the differences. Both laboratories are changing to a Gemini column to rectify the differences. Japanese laboratories are in the process of evaluating their split check samples. Keywords: quality assurance, quality control, endophyte, tall fescue, perennial ryegrass

Statistical Quality Control and Quality Assurance Evaluation of Structural and Paving Concrete

2003 ◽  
Vol 1861 (1) ◽  
pp. 71-85 ◽  
Author(s):  
Ravinder M. Diwan ◽  
Shashikant Shah ◽  
John Eggers
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Control Charts ◽  
Reporting System ◽  
Good Control ◽  
Statistical Quality Control ◽  
Quality Assurance Program ◽  
Major Contributor ◽  
Department Of Transportation ◽  
Structural Concrete

The variability associated with the production, construction, and testing of structural and paving concrete is discussed. Data from more than 900 projects constructed from 1992 through 1999 representing more than 25,000 lots were evaluated. The data were collected from the Louisiana Department of Transportation and Development’s (DOTD’s) computerized Material Test Data Reporting System. The analysis indicated that ( a) overall price reductions were less than 0.2% for structural concrete and about 0.5% for paving concrete, ( b) the thickness of concrete cores is the major contributor to the overall reduction in the price of paving concrete, ( c) there was good control in the production and testing of structural concrete, and ( d) there was an increase in the nonuniformity of paving concrete acceptance criteria. Recommendations include a need to maintain better control of the variability of paving concrete through the application of control charts or unknown variability in the specification types and a need for continued evaluation for monitoring the overall quality control and quality assurance program of the DOTD.

Codes, Standards and Regulatory Topics for Nuclear Facilities

2008 ◽  
Author(s):  
Taunia Wilde ◽  
Shannan Baker ◽  
Gary M. Sandquist
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Regulatory Commission ◽  
Department Of Energy ◽  
Quality Assurance Program ◽  
Nuclear Facilities ◽  
The Us ◽  
Regulatory Commission

The design, construction, operation, maintenance, and decommissioning and decontamination of nuclear infrastructure particularly nuclear power plants licensed in the US by the US Nuclear Regulatory Commission (NRC) or operated by the US Department of Energy (DOE) or the US Department of Defense (DOD) must be executed under a rigorous and documented quality assurance program that provides adequate quality control and oversight. Those codes, standards, and orders regulate, document and prescribe the essentials for quality assurance (QA) and quality control (QC) that frequently impact nuclear facilities operated in the US are reviewed and compared.

Factors Affecting Overlay Ride Quality

2000 ◽  
Vol 1712 (1) ◽  
pp. 58-65
Author(s):  
Kevin K. McGhee
Keyword(s):  
Asphalt Concrete ◽  
Time Of Day ◽  
Ride Quality ◽  
Factors Affecting ◽  
Original Surface ◽  
State Highway ◽  
The Subject ◽  
Asphalt Overlays ◽  
Special Provision ◽  
Highway System

A study was conducted to identify the predominant factors that affect the achievable smoothness of asphalt overlays. The subject was approached from the perspective of a contracting entity (state highway agency). The basis of the study was a roughness survey that incorporated 4270 lane-km (2,650 lane-mi) and two full construction seasons with hot-mix asphalt concrete paving. Among the variables found to be related to the achievable smoothness were the functional classification (highway system), original surface roughness, and a special provision for smoothness. Variables that were found to be not significantly related to the smoothness achieved included surface mix type, the application of additional structural layers, the use of milling, and time-of-day restrictions on construction activities (i.e., nighttime paving).

Development of Quality Control/ Quality Assurance Specifications by Using Statistical Quality Assurance for Asphalt Concrete Pavements in California

1998 ◽  
Vol 1632 (1) ◽  
pp. 13-21 ◽  
Author(s):  
Joe Dobrowolski ◽  
Terrie Bressette
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Asphalt Concrete ◽  
Quality Analysis ◽  
Materials Testing ◽  
California Department ◽  
Statistical Quality ◽  
Industry Group ◽  
Control Quality ◽  
Implementation Program

Since 1992, the California Department of Transportation (Caltrans) has been working to improve quality in construction contracting and ultimately the quality of the product provided to the public. In 1996, Caltrans implemented quality control/quality assurance (QC/QA) specifications for asphalt concrete paving. These specifications require contractor QC and provide rewards or penalties based on statistical quality analysis of eight quality characteristics. These specifications were developed through a joint Caltrans/industry group and are supplemented with a QC manual. They were introduced through presentations to user/producer groups, appointment of district QC/QA coordinators, and training for engineers. In March 1996 the first project using QC/QA specifications for asphalt concrete went to bid and in the first year six projects were completed with them. Early projects were for the most part successful. Throughout 1996-1997, the specifications, the QC manual, and the implementation program were reviewed. Revisions to the specifications have been developed. The specifications and manual, issues, recommendations based on the 1996 projects, changes Caltrans has made for the continued use of QC/QA for asphalt concrete, and anticipated additional endeavors in the areas of QC/QA and materials testing are discussed here.

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