Download or read book Review of Data in Construction Management System CMS and Quality Control and Quality Assurance QC QA Databases to Improve Current Specifications for Superpave and Concrete Pavements in Kansas written by Daba Gedafa and published by . This book was released on 2012 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Statistical specifications for highway construction are usually part of a statistical quality control process. These specifications provide the means to measure the important quality control attributes and ensure their compliance. The pay adjustments, part of these specifications, reflect the amount of deduction or bonus and the optimized risk distributed between the owner and the contractor. The Kansas Department of Transportation (KDOT) has built a comprehensive database of as-constructed properties of materials for Superpave pavements from the tests required as part of the Quality Control/Quality Assurance (QC/QA) program. Currently, KDOT pays incentives/disincentives for air voids and in-place density for Superpave pavements and thickness and strength for PCC pavements. A practical performance model and a composite index that include air voids, in-place density, asphalt content, and voids in mineral aggregate for Superpave pavements and thickness and strength for PCC pavements, respectively are needed to reflect the factors that affect their performance. The main objectives of this study were to investigate the effect of levels of significance and lot size, and to develop practical performance models and composite index for Superpave and PCC pavements in Kansas. Thirty-five Superpave pavements and 13 PCC projects from six administrative districts of KDOT were selected for this study. Lot-wise comparison showed that QC/QA means are significantly different in most cases. The number of cases with a significant difference in means increases with an increase in significance level. Practical performance models and composite index values from multiple quality characteristics have been proposed as integral parts of performance-related specifications (PRS) for Superpave and PCC pavements in Kansas.
Download or read book Review of Data in Construction Management System CMS and Quality Control and Quality Assurance QC QA Databases to Improve Current Specifications for Superpave and Concrete Pavements in Kansas written by Kiran Kumar Uppu and published by . This book was released on 2012 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: A recent study at Kansas State University has shown that asphalt producers in Kansas are producing hot-mix asphalt (HMA) mixtures with lower asphalt contents than those in the job-mix formula. These drier mixtures are thought to be susceptible to moisture. This project evaluated the effect of asphalt content on rutting and moisture resistance of HMA. Two different mixtures and four varying asphalt contents, optimum and lower, were selected. Another large-size mixture with four varying asphalt contents was also studied. The Hamburg Wheel Tracking Device (HWTD) test (TEX-242-F) and the Kansas Standard Test-56 (KT-56), or modified Lottman test, were used to predict moisture damage and rutting potential of these mixes. All specimens tested were prepared with the Superpave gyratory compacter. Results of this study showed the drier mixtures performed better in rutting and were less susceptible to moisture. Asphalt content significantly affects the number of wheel passes in the HWTD test. The study also revealed a weak correlation between asphalt film thickness and performance test results. Thus, the effect of varying asphalt content is somewhat nonconclusive from a durability point of view. However, performance simulations using a theoretical model show that very dry mixes in asphalt pavements are likely to have shorter performance lives.
Download or read book Investigation of Quality Control quality Assurance Data to Review Current Specifications for Portland Cement Concrete Pavement Acceptance in Kansas written by Shuvo Islam and published by . This book was released on 2018 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quality control (QC) and quality assurance (QA) attributes of highway construction must be measured and achieved throughout each project. Statistical specifications are commonly used to ensure compliance of QC and QA attributes, and attribute data must be reviewed periodically to improve specifications for agencies and contractors. The Kansas Department of Transportation (KDOT) typically considers concrete compressive strength and slab thickness to be QC attributes for portland cement concrete (PCC) pavements. This study reviewed KDOT QC/QA data from 24 PCC projects to investigate the effects of statistical level of significance and sample size on pay adjustment. Pay adjustments were calculated based on current KDOT practices and practical performance models (PPMs). Results showed no significant differences between lot means for all projects at any significance level or for any sample size, and no specific patterns were observed in pay adjustments for changing sample sizes. The PPM yielded higher pay deductions compared to current KDOT practices. This study also implemented a multivariate control chart to monitor and regulate the KDOT QC/QA process. Further investigation should explore why no significant differences were evident in lot means for strength and thickness; further research is also recommended to study the effect of sublot size on pay adjustment since pay adjustments can vary with the number of sublots. Coefficients of the PPM methods must be revisited if KDOT implements PPM methods for pay adjustments. Although use of a multivariate process control chart could be useful, especially when multiple variables are included in the QC process, further research is needed to effectively implement multivariate process control charts into the QC process.
Download or read book Advanced Quality Systems written by and published by . This book was released on 2006 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superpave Mix Design written by Asphalt Institute and published by . This book was released on 2001-01-01 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Demonstration Project 42 written by and published by . This book was released on 1980 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EPA Requirements for Quality Assurance Project Plans for Environmental Data Operations DRAFT written by and published by . This book was released on 1994 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quality Assurance Guide Specification written by American Association of State Highway and Transportation Officials. Highway Subcommittee on Construction and published by . This book was released on 1996 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report along with its companion report, Implementation Manual for Quality Assurance include quality control requirements for the contractor and or supplier and quality assurance requirements for the agency. These reports consider the all encompassing concept of quality control, quality acceptance, independent assurance (I.A.) laboratory accreditation, technician training and certification, and contractor quality control plans.
Download or read book Evaluation of State Quality Assurance Program Effectiveness written by James S. Moulthrop and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In early 2008, the Federal Highway Administration issued a task order under the Advanced Quality Systems Indefinite Delivery/Indefinite Quantity Contract for a contractor to quantify the effectiveness of State quality assurance (QA) programs. The objective of the study was to develop, apply, and make recommendations for the use of a procedure that transportation departments could use to quantify and improve the effectiveness of existing quality assurance programs. Based on the knowledge and experience of the research team, four State highway agencies (SHAs) were chosen to participate. An introductory project meeting was held in December 2008, but due to personnel problems, only three agencies participated. The goal of the meeting was to discuss the objectives and scope of the project with State representatives and request their input. The three SHAs agreed to provide QA data from construction projects in their State for the team to analyze. Because sufficient data were not available to accomplish the original task, the scope was modified to use an analysis of acceptance procedures included in the agencies' specifications instead of using actual QA data. In summary, four SHA construction specifications were selected for analysis from three SHAs, two for hot mix asphalt (HMA) pavements and two for portland cement concrete (PCC) pavements. The study shows that either the computer program SPECRISK or computer simulation can be used to analyze the statistical risks of most, if not all, specifications. Both HMA pavement specifications and one of the PCC pavement specifications were amenable to analysis by SPECRISK because they are based on percent within limits as the statistical quality measure. The remaining PCC pavement specification was based on averages and had to be analyzed by computer simulation. Probabilistic Optimization for Profit (Prob. O. Prof) was one of the software programs anticipated to be useful in the analysis. However, it required data that were not available and thus could not be used in the analyses. The report includes analysis of the specifications, particularly the risks involved and recommendations for improving areas that are considered unclear or statistically invalid.
Download or read book Construction QA QC Systems that Work written by George Stukhart and published by . This book was released on 1985 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of State Quality Assurance Program Effectiveness written by James S. Moulthrop and published by . This book was released on 2012 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: In early 2008, the Federal Highway Administration issued a task order under the Advanced Quality Systems Indefinite Delivery/Indefinite Quantity Contract for a contractor to quantify the effectiveness of State quality assurance (QA) programs. The objective of the study was to develop, apply, and make recommendations for the use of a procedure that transportation departments could use to quantify and improve the effectiveness of existing quality assurance programs. Based on the knowledge and experience of the research team, four State highway agencies (SHAs) were chosen to participate. An introductory project meeting was held in December 2008, but due to personnel problems, only three agencies participated. The goal of the meeting was to discuss the objectives and scope of the project with State representatives and request their input. The three SHAs agreed to provide QA data from construction projects in their State for the team to analyze. Because sufficient data were not available to accomplish the original task, the scope was modified to use an analysis of acceptance procedures included in the agencies' specifications instead of using actual QA data. In summary, four SHA construction specifications were selected for analysis from three SHAs, two for hot mix asphalt (HMA) pavements and two for portland cement concrete (PCC) pavements. The study shows that either the computer program SPECRISK or computer simulation can be used to analyze the statistical risks of most, if not all, specifications. Both HMA pavement specifications and one of the PCC pavement specifications were amenable to analysis by SPECRISK because they are based on percent within limits as the statistical quality measure. The remaining PCC pavement specification was based on averages and had to be analyzed by computer simulation. Probabilistic Optimization for Profit (Prob.O.Prof) was one of the software programs anticipated to be useful in the analysis. However, it required data that were not available and thus could not be used in the analyses. The report includes analysis of the specifications, particularly the risks involved and recommendations for improving areas that are considered unclear or statistically invalid.
Download or read book Long Term Pavement Performance Indicators for Failed Materials written by Jaehyun Park and published by . This book was released on 2016-10-31 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: State Transportation Agencies (STAs) use quality control/quality assurance (QC/QA) specifications to guide the testing and inspection of road pavement construction. Although failed materials of pavement rarely occur in practice, it is critical to have a sound decision framework to assist in making data-driven, informed decisions regarding failed materials because such decisions have profound impacts on the long-term performance of the pavement and the operation and maintenance costs of the responsible highway agencies.A performance-related specification (PRS) is a quality acceptance (QA) specification that specifies the acceptable levels of key acceptance quality characteristics (AQCs) that are directly related to fundamental engineering properties, which in turn, determine the long-term performance of the constructed end products. Two PRS tools, PaveSpec for Portland Cement Concrete Pavement (PCCP) and Quality Related Specification Software (QRSS) for QC/QA Hot Mixed Asphalt (HMA) pavement with dense grade mixes, were investigated in this study to develop decision frameworks for PCCP and HMA pavement to assist the decision-making regarding failed materials at INDOT. A large number of simulations of various scenarios in the context of INDOT pavement construction were conducted to fully develop and implement the decision framework.
Download or read book Quality Control for Concrete Paving written by Tara Cavalline and published by . This book was released on 2021 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quality control (QC) by contractors, concrete suppliers, and materials suppliers is an integral component of a transportation agency’s quality assurance (QA) program and supports the construction of quality concrete infrastructure. This guide is intended to serve as a tool that both contractor and agency personnel can use at the batch plant, behind the paver, and at other locations on the job. Contractors can use this guide to improve or enhance their existing QC programs and plans by incorporating the appropriate provisions into their operations. This guide can also help agency personnel become familiar with the components of a comprehensive QC plan for concrete paving projects, the ways such a QC plan benefits agencies, and ways to appropriately incorporate QC requirements into specifications. In addition, this guide provides background knowledge to help agency and contractor personnel understand the elements of an agency’s QA program and why QC is an important part of that program.
Download or read book Measurement and Specification of Construction Quality written by Charles S. Hughes and published by . This book was released on 1998 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This study consisted of testing six projects: three hot-mix asphalt concrete (HMAC) and three portland cement concrete (PCC). The primary objectives were to: (1) determine how current quality control test results vary in construction projects and how this variability affects pavement performance, (2) assess the suitability of current methods of quantifying materials and construction quality and quality variability, and (3) develop and improve methods that minimize current shortcomings. Volume I of this report contains information about the data analysis. Volume II provides information about the data collected and use of the ground penetrating radar to determine thickness of the pavement. Volume II also contains univariate data on each of the tests performed on samples taken from the six projects in this study"--Technical report documentation p.
Download or read book A Computerized Data Management System for U S EPA QA QC Methods written by TO. DiFruscio and published by . This book was released on 1988 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes a user-friendly IBM-PC compatible computer program capable of managing the Quality Assurance/Quality Control (QA/QC) requirements of any size laboratory performing analysis to Environmental Protection Agency (EPA) specifications. The program design criteria addresses the QA/QC requirements of the analysis of sludges, sediments, waters, and other materials. The database is initialized using well established standard data for solids and liquids (for example, Standard Reference Materials from the National Bureau of Standards). The analyst enters the following QC data for the parameters of interest into the database: found concentrations for internal and/or external standards, values for blanks, spike recoveries, replicates, duplicates, and midpoint internal standards. This step is performed for each parameter for each discrete sample set or analytical run. The program then generates control charts for these parameters and creates a QC data sheet, which documents all aspects of the QA/QC requirements for chemical analysis as specified by the EPA. This database management system also transfers the QA/QC documentation into a universal format capable of being used in standard statistical and spreadsheet software, such as Lotus 1-2-3, Supercalc 4, Chartmaster, and others. This allows a wide range of statistical and graphical manipulations to be performed not only on the QA/QC data but on the analytical data as well.
Download or read book Guidelines for Establishing and Maintaining Construction Quality Databases written by and published by . This book was released on 2006 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Construction quality databases contain a variety of construction-related data that characterize the quality of materials and workmanship. The primary purpose of construction quality databases is to help State highway agencies (SHAs) assess the quality of materials production and placement, including the establishment of pay factors for quality. A secondary purpose is to support other agency activities, including performance analysis and improvements to current standards and specifications. These databases have become a critical component in construction quality assurance (QA) programs.
Download or read book Measurement and Specification of Construction Quality written by and published by . This book was released on 1998 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study consisted of testing six projects: three hot-mix asphalt concrete (HMAC) and three portland cement concrete (PCC). The primary objectives were to: (1) determine how current quality control test results vary in construction projects and how this variability affects pavement performance, (2) assess the suitability of current methods of quantifying materials and construction quality and quality variability, and (3) develop and improve methods that minimize current shortcomings. Volume I of this report contains information about the data analysis.
