Specs

Bridgestone Retail Operations, LLC
PROJECT MANUAL
Version: January 2012
Concrete sampling shall be performed by an ACE certified technician, Grade 1 or higher.
3.06 Testing Services for Concrete Shall Include:
a. Review Contractor’s proposed materials and mix design for conformance with specifications.
b. Conduct strength tests as required in the Specification:
• Secure composite samples in accordance with ASTM C172. Sample at regularly spaced
intervals from the middle portion of the batch. Sampling time shall not exceed fifteen (15)
minutes.
• Mold and cure specimens in accordance with ASTM C31.
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A minimum of four (4) concrete test cylinders shall be taken for every 100 cubic
yards or less of each class of concrete placed each day and not less than once
for each 4,000 square feet of surface area for slab.
Initial cure during the first 24 hours shall be made by placing cylinders adjacent
to the pour. Protect cylinders for loss of moisture by covering with wet sand,
burlap, visqueen, or curing compound. Protect cylinders from direct sunlight or
radiant heating devices. Do not disturb cylinders.
Do not transport cylinders to laboratory within the first 48 hours. Protect
cylinders from vibration, freezing temperatures and moistures loss during
transportation.
Wet cure cylinders under controlled temperature until testing.
• Test Cylinders in accordance with ASTM C39.
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Date test cylinders and number consecutively. Give each cylinder of each set an
identifying letter (i.e. A, B, C etc.). Prepare a sketch of the building plan for each
test set identifying the placed concrete location(s).
Test one cylinder (A) at 7 days for information
Test two cylinders (B and C) at 28 days and the average of the breaks shall
constitute the compressive strength of the concrete sample.
Retain fourth cylinder (D) for further testing if needed, but do not cylinder for
more than 60 days.
• Conduct slump test for each cylinder set taken in accordance with ASTM C143. Make
additional slump tests for every other load from a stationary mixer or truck to test
consistency. Sampling shall be in accordance with ASTM C172
• Conduct air content test for each cylinder set for concrete exposed to freeze-thaw in
accordance with ASTM C231, ASTM C173, or ASTM C138. Indicate the test method on
the report. Test shall be made at the same time as the slump test.
• Conduct temperature test for each concrete sample.
• In addition to the required information noted previously in this section, record the following
information on concrete compression reports:
o Test cylinder number and letter.
o Specific foundations or structures covered by this test.
o Proportions of concrete mix or mix identification.
o Maximum size coarse aggregate.
o Specified compressive strength.
o Tested compressive strength.
o Slump, air contentment (when applicable) and concrete temperature.
o Date and time concrete was placed.
QUALITY REQUIREMENTS 01400 - Page 6 of 11