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Test specimens shall be initially cured onsite, then shall be transported
in an approved manner to an approved testing laboratory meeting the
requirements of ASTM C 1077 within 48 hours of scheduled testing time.
3.7.1.1
Test Panel
One test panel shall be made for every 40 cubic meters 50 cubic yards of
shotcrete placed but not less than one per each shift during which any
shotcrete is placed. Panels shall have minimum dimensions of 450 by 450 by
100 mm 18 by 18 by 4 inches and shall be gunned in the same positions as
the work represented during the course of the work by the Contractor's
regular nozzleman. Panels shall be field cured in the same manner as in
the job. [Three [_____] mm inch diameter cores shall be drilled from each
panel at least 40 hours prior to testing and tested in accordance with ASTM
C 1140.] [Two 100 by 100 by 350 mm 4 by 4 by 14 inch beams shall be saw
cut from the test panels when fiber-reinforced shotcrete is used. The
fiber-reinforced shotcrete beams shall be tested in accordance with ASTM C
1140 [ASTM C 1018.] If the quality of shotcrete is questionable, the
Government may saw or core the panel specimens to determine the shotcrete
quality and if remedial action is necessary.]
3.7.1.2
[Test Cores
Test cores shall be drilled from the structure at least 40 hours prior to
testing and tested in accordance with ASTM C 1140. A set of three cores
shall be taken not less than once each shift that shotcrete is placed nor
less than once for each 40 cubic meters 50 cubic yards of shotcrete placed
through the nozzle. The diameter of core specimens shall be determined in
accordance with ASTM C 42/C 42M.]
3.7.1.3
[Compressive Strength
The compressive strength of the shotcrete shall be determined from the
average of three cores obtained from [a test panel] [the structure]
representing a specific volume of shotcrete and tested on the [_____] day
after [panel fabrication] [placement in the structure.]]
3.7.1.4
[Flexural Strength
The flexural strength of the shotcrete shall be determined from the average
of two test specimens obtained from a test panel and tested on the [_____]
day after panel fabrication.]
3.7.1.5
[Toughness Index
The toughness index of the shotcrete shall be determined from the average
of two test specimens obtained from a test panel and tested on the [_____]
day after panel fabrication.]
3.7.2
Aggregate Moisture
Prior to batching the shotcrete and at least once during a shift in which
shotcrete is being batched, the coarse and fine aggregate moisture content
shall be determined in accordance with ASTM C 566. The batch weights of
both the aggregates and mixing water shall be appropriately adjusted to
account for the available free moisture in the aggregates. The amount of
free moisture in the aggregates, expressed as kilograms pounds of water per
SECTION 03371
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