Download or read book An Assessment of WSDOT s Hot mix Asphalt Quality Control and Assurance Requirements written by Kim A. WIlloughby and published by . This book was released on 2007 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Statistical Assessment of Quality Assurance quality Control Data for Hot Mix Asphalt written by and published by . This book was released on 2009 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quality Assurance Specification Review for Hot Mix Asphalt and Structural Concrete written by Chuck E. Hughes and published by . This book was released on 2000 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report includes three parts: (1) Final Report for Quality Assurance Specifications Review dated May 2000; (2) Addendum to the Final Report dated December 2000; and (3) Draft Construction Manual and Inspection Guidelines dated May 2000. The study tasks included a detailed analysis of the quality assurance (QA) special provision, evaluation of Department and Contractors risks, examination of practice of using Contractors tests results for acceptance, guidelines for effective use of QA specifications by field inspection staff, need for adjustments to material specification limits, interviews with Department and Contractor personnel and the impact of recommended changes to the Contractors.
Download or read book Concrete Pavement Rehabilitation written by and published by . This book was released on 1997 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Load transfer restoration (LTR) is a rehabilitation technique for increasing the load transfer capability of existing jointed portland cement concrete pavement by placement of dowel bars or other mechanical devices across joints and/or cracks that exhibit poor load transfer.
Download or read book Quality Control and Quality Assurance of Hot Mix Asphalt Construction in Delaware written by Radha Akkinepally and published by . This book was released on 2006 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the mid 60's the Federal Highway Administration began to encourage Departments of Transportation and Contractors toward the use of quality control and quality assurance (QA/QC) specifications, which are statistically based. For example, a QA specification has become an important component in organization commitment to overall quality management. This consists of several activities including: process control, acceptance, and sometimes independent assurance of product (Buttlar and Harrell, 1998). These specifications must be designed to reward good quality, and penalize poor quality. The QA specification, also called as the QA/QC specification, is a combination of end-result specifications and materials and methods specifications. The highway agency is responsible for the acceptance of the product that is produced by the contractor following or implementing quality control in order to produce a product that meets the specifications provided by the highway agency. QA specifications typically are statistically based specifications that use methods such as random sampling in which the properties of the desired products or constructions are described by appropriate statistical parameters, and lot by lot testing. These methods would help the contractor know whether or not the operations are producing the acceptable product. Specifications for the construction of asphalt pavements can be classified into propriety specifications, method-related specifications (MRS), end-result specifications (ERS), performance-related specifications (PRS) or combination of these specifications. Propriety Specification This type of specification refers to some specific product or its equivalent in its clauses; therefore, it limits the competition and often results in a cost increase. Since the buyer has to accept the product as a "black box", the buyer's risk is much higher than in the other three types of specifications Method Specification This type of specification outlines a specific material selection and construction operation process to be followed by the contractor in providing a product. Since there is no explicit product specified, this type of specification allows competition among various suppliers and contractors; but, because the buyer sets the requirements for materials and methods, the owner has to bear the responsibility of the performance. End-Result Specification The final characteristics of the product are stipulated in the end-result specification and the contractor is given considerable freedom in achieving those characteristics. It may specify a limit or range for any given material and/or construction characteristic. The risk for the contractor or agency depends on how the acceptance limits and processes are specified. Performance Related Specification (PRS) This type of specification holds the contractor responsible for the finished product's performance; thus, the contractor assumes considerable risk for the performance of the finished product. This type of specification is often used in conjunction with some type of warranty. The challenge here is to use "true" performance indicators, which may not be available for all materials and processes. Statistical acceptance specifications tend to provide a more defensible approach to specifying HMA construction than the previously used methods of specification (Muench and Mahoney, 2001).
Download or read book Guide for Obtaining Cores and Interpreting Compressive Strength Results written by ACI Committee 214 and published by . This book was released on 2003 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide summarizes current practices for obtaining cores and interpreting core compressive strength test results. Factors that affect the in-place concrete strength are reviewed so locations for sampling can be selected that are consistent with the objectives of the investigation.
Download or read book Effectiveness Comparison of TxDOT Quality Control quality Assurance and Method Specifications written by Mansour Solaimanian and published by . This book was released on 1998 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: This purpose of this study was to evaluate the quality of the hot mix asphalt concrete produced under quality control/quality assurance (QC/QA) specification item 3063. During the first phase of this project, conducted between September 1996 and February 1997, an extensive amount of technical information and numerical information was gathered and analyzed. During the second phase of this project, various other activities were carried out, including a survey of other states to assess their approach in developing and implementing QC/QA specifications, a physical survey of QC/QA and non-QC/QA specification projects in Texas, and a limited evaluation of the cost of the projects. This report presents the results, findings, conclusions, and recommendations based on the collected information and on the work performed during the course of this research program.
Download or read book Testing and Inspection Levels for Hot mix Asphaltic Concrete Overlays written by Jeffrey S. Russell and published by . This book was released on 2001 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variability in Highway Pavement Construction written by Charles S. Hughes and published by Transportation Research Board. This book was released on 1996 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis will be of interest to state DOT construction, materials, statistical, specification, and inspection engineers; DOT research staff; pavement construction material suppliers; highway construction contractors; and civil engineering consulting firms, including field and laboratory materials testing personnel. The synthesis describes the state of the practice for defining and measuring variability in highway pavement construction. Data obtained from a review of the literature, a survey of state departments of transportation (DOTs), and discussions with selected state DOT personnel and private materials producers are presented. This report of the Transportation Research Board defines several measures of variability but concentrates on the use of standard deviation as the usual measure of variability. The synthesis updates reported typical variabilities found in materials and construction specifications. Also included are discussions of current research activities as related to variability, how variability can be used in the development of specification limits, the use of incentives and disincentives in specifications, and the need for additional information on the variability of several materials and construction processes.
Download or read book Quality Control and Quality Assurance of Hot Mix Asphalt Construction in Delaware written by Radha Akkinepally and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a study where the objective is the development of an appropriate statistical acceptance procedure for the Delaware Department of Transportation. DELDOT's modification of its specifications for the acceptance of Hot Mix Asphalt (HMA) in order to incorporate quality assurance concepts lead to requirements such as the emphasis laid on the HMA producer in terms of quality control activities such as performing component material tests, tracking test results on control charts and following the plan developed by DELDOT. The incorporation of new statistically based acceptance specifications used new criteria for acceptance rather than the previous methods of minimum test result requirements for numerous criteria. After the statistical acceptance procedure was reviewed and used for quantifying and evaluating the DELDOT's statistical plan, a comparative analysis between the developed procedure and the FAA and FHWA procedure was done for achieving the objective and providing recommendations and new composite pay factors were developed.
Download or read book The Next Step Toward End result Specifications for Hot mix Asphalt Materials and Construction written by Charles S. Hughes and published by . This book was released on 2007 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2000, the Virginia Department of Transportation's (VDOT) Chief Engineer asked the Virginia Transportation Research Council to develop a vision of how and when VDOT would have a working end-result specification for hot-mix asphalt. The response to that question was that it would take several years and many steps to achieve. This report discusses the next step in that ongoing effort, which includes the development and simulated application of two statistical quality assurance (SQA) special provisions, one for asphalt concrete material and the other for asphalt concrete pavement. The criteria for these prototype SQA provisions included the application of standard national terminology and approach, a firm basis in existing VDOT specifications, and quality characteristics that represent the best practical performance measures. This report describes the outcome of a "shadow" application of the proposed SQA specifications to a subset of Virginia's annual maintenance-resurfacing projects. Although the involved production and placement activities were not subject to the requirements of the SQA specifications, the sampling and testing were designed to represent what would have been required had the special provisions been in effect. The study further determined the likely acceptance outcome for each shadow project and explored future modifications to specification limits and pay adjustment criteria. The most desirable benefit from effective end-result specifications stems from the ability to rededicate available inspection to those key production and placement processes (e.g., joint tacking and surface preparation) that cannot be measured upon delivery to the owner/agency. A less desirable, but more tangible, financial benefit results when these specifications permit a reduction in the overall inspection force. One conservative estimate suggests that VDOT could save more than $2 million per year in inspector salaries through an end-result specification for acceptance of hot-mix asphalt pavements
Download or read book Guide for Pavement Friction written by and published by AASHTO. This book was released on 2008 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains guidelines and recommendations for managing and designing for friction on highway pavements. The contents of this report will be of interest to highway materials, construction, pavement management, safety, design, and research engineers, as well as others concerned with the friction and related surface characteristics of highway pavements.
Download or read book Mechanistic empirical Pavement Design Guide written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 2008 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Qualifying Items of Work for End result Specifications written by William E. Elmore and published by . This book was released on 1997 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Texas Department of Transportation (TxDOT) is presently using a quality control/quality assurance (QC/QA) specification for hot-mix asphalt concrete pavement. There is a strong interest in determining if other construction items can be converted to this type of specification. The purpose of this report is to (1) review the experiences of a large number of key states believed to be using these types of specifications, (2) review the TxDOT standard specifications in order to recommend candidates for development, and (3) develop a recommended QC/QA specification for flexible base. Of the 23 states contacted, 19 cooperated in the survey, the majority of which were willing to provide copies of their specifications. Fifteen specifications have been received. Based on the information obtained from these reviews, nine items have been recommended for consideration by TxDOT.
Download or read book Precast concrete piles written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 1986-01-01 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: This technical report covers all aspects of the uses of precast concrete piles - design, manufacture, transport, handling, pitching and driving. Both reinforced and prestressed concrete piles are dealt with and attention is paid to the use of both plan piles and those with enlarged toes. Although the report is a translation of parts of a set of three volumes prodduced in the Netherlands, those parts reproduced are internationally applicable. Special sections deal with the effects of pile driving on adjacent buildings and theor occupants - both as regards vibration and noise.
Download or read book Quality Assurance in Design build Projects written by Douglas D. Gransberg and published by . This book was released on 2008 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
