of the NCDOT Standard Specifications and all applicable Project or Standard Special Provisions provide for Quality Control and Quality Assurance of asphalt pavements by use of a Quality Management System (QMS). The basic concept of this process is that the Contractor performs adequate testing and inspection to insure a quality asphalt pavement and the Department performs adequate testing and inspection to insure that the Contractor’s results are accurate. This system requires both the Department and the Contractor to have technicians that are competent in production, construction, testing, and inspection of asphalt pavements. The general idea is for the Contractor to perform the necessary tests and inspection to insure the likelihood that all mix meets the Specifications instead of “after-the-fact” testing to see if it does meet the Specifications. This approach gives the Contractor much more control over his total operations. He is responsible for his product from the design of the mix to the final acceptance of the pavement. The Department simply monitors his process to be sure that what he is doing is adequate and accurate; and, then performs independent testing to verify the quality of the end product.
The Contractor’s responsibility under the QMS process is referred to as Quality Control (QC). The Department’s responsibility under the QMS process is referred to as Quality Assurance (QA). The Contractor is responsible to provide competent personnel to perform his quality control and the Department is responsible to provide competent personnel to perform their quality assurance. The requirements and details of certification for these personnel to perform the QC/QA work is given in
The requirements for the Contractor’s QC sampling and testing are contained in
of the Specifications and
. The frequency of these activities may vary with the process and the materials. When test results vary from the design and/or specifications, changes to the process shall be made. The frequency of the appropriate QC activities shall be increased until the proper conditions have been restored. The Department’s minimum frequency requirement for QA sampling and testing is specified in
and is covered in detail later in this manual.
The Contractor may utilize innovative equipment or techniques not addressed by the specifications or these provisions to produce or monitor the production of the mix, subject to approval by the Department's Engineer.
QMS is a total process that encompasses the Contractor’s mix design, the QC testing and inspection, and the Department’s quality assurance and acceptance of the Contractor’s process and procedures. Each of these aspects of the total process will be addressed in detail later in this manual. While all of these are very important, the real success of this program is that the Contractor and the Department carry out every aspect of the process such that a quality asphalt pavement is the final product.