1 Mar 98
must be ACI certified as Concrete Field Testing Technicians Grade I, or Concrete Laboratory
Testing Technicians Grade I or II..
(1) Concrete strength. Strength data should always be immediately reviewed and can be
analysed at the construction office, or can be sent to the design office for analysis and rapid
feedback to the construction office.
(2) Aggregate tests. Deleterious materials are particles of aggregate which even at relatively
low percentages can have an adverse effect on the strength and durability of the pavement. These
tests are essential. Only the specific deleterious material test(s) that pertain to the aggregate(s)
being used need to be tested at the frequency specified. Deleterious material testing frequency
must be closely followed, and may be reduced as specified after initial test results are consistently
within required limits. QC and QA testing laboratories should be briefed on the importance and
specific tests required for deleterious materials compliance.
(3) Slump and air content. Slump and air content (particularly in frost regions) must be
checked at the stipulated intervals, but also any time a concrete batch looks suspect.
(4) Test result actions. All of the QC test results must be recorded on control charts which
must be turned in to the Government each day. When any individual tests indicate materials or
work exceed specification limits, specific action is required, including doubling the testing
frequency or stopping work.
t. Mandatory government quality assurance. If government manpower is short, a separate
commercial lab should be contracted for QA testing, using ACI certified Field Testing Technicians
Grade I or Certified Laboratory Technicians Grade I or II. At the beginning of the job, QA
testing frequency should nearly match that of QC testing. After initial QA testing demonstrates
the adequacy of the QC program, QA testing can be scaled back to a rate meeting ER 1180-1-6,
"Construction Quality Management." Preparatory inspections just prior to each concrete
pavement placement should be well documented for use if later problems develop.
u. Project staffing. Proper inspection
of a paving job
of this magnitude
requires at least two
(three is better) experienced full-time Quality Assurance Representatives (QAR). One to monitor
production at the plant and one to monitor placement at the paver. These QAR should be assisted
by adequate office staff to process paperwork. A high priority should be put on keeping the
project adequately staffed.
v. District field support. The design office has a keen interest in concrete pavement
construction support. Personnel experienced in concrete paving are available to answer field
questions and to assist in the field inspection, to conduct a pre-construction paving workshop for