once every 6 months when concrete is being placed, uniformity of
concrete shall be determined in accordance with ASTM C 94/C 94M. The
truck mixers shall be selected randomly for testing. When satisfactory
performance is found in one truck mixer, the performance of mixers of
substantially the same design and condition of the blades may be
regarded as satisfactory.
3.7.2.14
Mixer Uniformity Corrective Action
When a mixer fails to meet mixer uniformity requirements, either the mixer
shall be removed from service on the work, the mixing time shall be
increased, batching sequence changed, batch size reduced, or adjustments
shall be made to the mixer until compliance is achieved.
3.7.3
Reports
All results of tests or inspections conducted shall be reported informally
as they are completed and in writing daily. A weekly report shall be
prepared for the updating of control charts covering the entire period from
the start of the construction season through the current week. During
periods of cold-weather protection, reports of pertinent temperatures shall
be made daily. These requirements do not relieve the Contractor of the
obligation to report certain failures immediately as required in preceding
paragraphs. Such reports of failures and the action taken shall be
confirmed in writing in the routine reports. The Contracting Officer has
the right to examine all test and inspection records.
SECTION 03301A
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