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:
  Highway Engineering--Delaware--Quality Control Hot Mix Asphalt Quality Assurance Quality Control Road Construction Road Construction Contracts--Delaware Road Construction Industry--Delaware--Quality Control Roads--Delaware--Quality Control
• 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).
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:dedf4d027fb2885deb2746e311139970f29beaf98c292c6c2bdbf38d5c45cbfe
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17965/dot_17965_DS1.pdf
• File Type:
  [PDF - 1.77 MB ]