Quality control and quality assurance of hot mix asphalt construction in Delaware.

Details

• Creators:
  Akkinepally, Radha ; Attoh-okine, Nii
• Corporate Contributors:
  University of Delaware. Department of Civil and Environmental Engineering ; Delaware. Dept. of Transportation
• Subject/TRT Terms:
  • Road construction
  • Hot mix asphalt
  • Quality control
  • Quality assurance
  • Roads--Delaware--Quality control
  • Road construction industry--Delaware--Quality control
  • Highway engineering--Delaware--Quality control
  • Road construction contracts--Delaware
• Resource Type:
  Tech Report
• Geographical Coverage:
  Delaware
• Corporate Publisher:
  Delaware Center for Transportation
• Abstract:
  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).
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17965/dot_17965_DS1.pdf
• File Type:
  [PDF - 1.77 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:dedf4d027fb2885deb2746e311139970f29beaf98c292c6c2bdbf38d5c45cbfe