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The following step by step procedure shall be followed:
a.
Fabricate all beams for each mixture from the same batch or blend
of batches. Fabricate and cure all beams in accordance with ASTM
C 192/C 192M, using 152 x 152 mm 6 x 6 inch steel beam forms.
b.
Test beams in accordance with ASTM C 78.
c.
Fabricate and cure test beams from each mixture for 3, 7, 14, [28]
and [90]-day flexural tests; 6 beams to be tested per age.
d.
Using the average strength for each w/c at each age, plot all
results from each of the three mixtures on separate graphs for w/c
versus:
3-day flexural strength
7-day flexural strength
14-day flexural strength
[28-day flexural strength]
[90-day flexural strength]
e.
From these graphs select a w/c that will produce a mixture giving
a [28] [90]-day flexural strength equal to the required strength
determined in accordance with paragraph "Average CQC Flexural
Strength Required for Mixtures".
f.
Using the above selected w/c, select from the graphs the expected
3, 7 and 14-day flexural strengths.
g.
From the above expected strengths for the selected mixture,
determine the Ratio of the 7-day flexural strength of the selected
mixture to the [28] [90]-day flexural strength of the mixture (for
CQC control).
h.
From the above expected strengths for the selected mixture,
determine the Ratio of the 14-day flexural strength of the
selected mixture to the [28] [90]-day flexural strength of the
mixture (for acceptance).
i.
No concrete pavement shall be placed until the Contracting Officer
a.
Fabricate all beams and cylinders for each mixture from the same
batch or blend of batches. Fabricate and cure all beams and
cylinders in accordance with ASTM C 192/C 192M, using 152 x 152 mm
6 x 6 inch steel beam forms and 152 x 305 mm 6 x 12 inch steel
cylinder forms.
b.
Test beams in accordance with ASTM C 78, cylinders in accordance
with ASTM C 39/C 39M.
c.
Fabricate and cure test beams from each mixture for 3, 7, 14, [28]
and [90]-day flexural tests; 6 beams to be tested per age.
d.
Fabricate and cure test cylinders from each mixture for 3, 7, 14,
[28] and [90]-day compressive strength tests; 6 cylinders to be
tested per age.
SECTION 02753
Page 49