FIELD MANUAL For HOT MIX ASPHALT (HMA) - Mississippi ...

CHAPTER 5
CONTRACTOR’S QUALITY MANAGEMENT
PROGRAM
5.1 General. The Contractor is responsible for quality management and maintenance of
a quality control system that furnishes reasonable assurance that the mixtures and all
component materials incorporated in the work conform to contract requirements.
The Contractor is responsible for the initial determination and all subsequent
adjustments in proportioning materials used to produce the specified mixture.
Adjustments to plant operation, spreading, and compaction procedures must be made
immediately by the Contractor when results indicate that they are necessary.
5.2 Sampling.
5.2.1 Aggregate and RAP Stockpiles.
5.2.1.1 Sampling Location. Obtain samples from the stockpiles or cold feed bins
in accordance with AASHTO T 2.
5.2.1.2 Sampling and Testing Frequency. Take the first sample of each stockpile
after the stockpiles have been established at the hot-mix plant and prior to the first
day of mixture production. Thereafter, sample once every eight production samples
with a minimum of one from each stockpile per production week. Stockpile testing
of the aggregate and RAP piles during production will be waived provided that
gradation tests were conducted during the building of the stockpiles (see Subsection
401.02.5.3 of the contract specifications).
5.2.1.3 Testing. Determine the washed gradation of each aggregate stockpile
sample in accordance with AASHTO T 11 and T 27.
Determine the gradation of RAP stockpile samples in accordance with MT-31.
Determine the asphalt content of the RAP stockpile when necessary using the same
procedures used for the design of the mixture (MT-78).
For all 9.5 mm mixtures, and all MT and HT mixtures designed above the maximum
density line, determine the fine aggregate angularity of the aggregate blend in
accordance with ASTM C 1252, Method A. Conduct the tests in an area of the
laboratory not subjected to vibration. This test may be conducted off site.
5.2.2 Asphalt Binder Material. Asphalt binder is accepted in accordance with the
procedures set out in the Materials Division Inspection, Testing, and Certification
Manual Section 2.1.2..
Rev. February 5, 2007 20