Mixture Proportions -33710019

cubic meter, yard, shall be recorded on the batching ticket and delivered

to the Contracting Officer prior to placement during the shift. The

Contracting Officer will have the option to request additional aggregate

moisture content tests for each of the required tests.

3.7.3

Grading

The grading of the coarse and fine aggregate shall be determined in

accordance with ASTM C 136. The fine and coarse aggregate grading shall be

determined prior to batching the shotcrete and at least once during a shift

in which shotcrete is being batched. The Contracting Officer will have the

option to require one additional sieve analysis test for aggregate type.

3.7.4

Thickness

The minimum shotcrete thickness shall be as shown in the drawings. The

unhardened shotcrete shall be checked for thickness using a probe by the

nozzleman or laborer at the time of placement. These thickness checks

shall be at 15-minute intervals and all low or thin areas shall be

corrected by applying additional shotcrete.

3.7.5

Mixture Proportions

Record and check mixture proportions at least once per shift for weigh

batching. Record and check mixture proportions as recommended by ASTM C

685/C 685M at least once per shift for volumetric batching and continuous

mixing plants.

3.7.6

Preparations

Prior to each placement of shotcrete, the Contractor's inspector shall

certify in writing or by an approved checkout form that cleanup and

preparations are in accordance with the plans and specifications.

3.7.7

[Air Content

Air content tests shall be conducted on wet-mix shotcrete according to ASTM

C 231 with a frequency of not less than once each shift nor less than once

for each 40 cubic meters 50 cubic yards of shotcrete placed through the

nozzle. Tests shall be conducted on samples taken as the wet shotcrete

mixture is placed in the delivery equipment.]

-- End of Section --

SECTION 03371

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