CCIL Section 3C, 5C Questions and Answers
3C: Cylindrical Moulds for testing specimens should be...
Made of non absorbent surfaces and sufficiently rigid to hold their shape during moulding.
3C: Do not use cardboard moulds when...
Concrete strengths greater than 35MPA
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CCIL Section 3C, 5C Questions and
Answers
3C: Cylindrical Moulds for testing specimens should be... - answer Made of non
absorbent surfaces and sufficiently rigid to hold their shape during moulding.
3C: Do not use cardboard moulds when... - answer Concrete strengths greater than
35MPA
3C: Rectangular Moulds - answer Will be used for Flexural Test Specimens. Mould
shall be at least 50mm longer than length of span. Cross sectional area may not exceed
3mm.
3C: Tamping Rod for 100mm x 200mm... - answer Round Steel Straight tamping rod
10mm+-1mm in diameter, between 450mm no more than 600mm in length with a
hemispherical tip.
3C: For cylinders 150mm in diameter or greater, and for Rectangular Moulds the rod
must be... - answer Steel Straight bar, 16mm +- 1mm in diameter, not less than
450mm nor more than 600mm in length and one hemispherical tip.
3C: Internal Vibrators - answer Vibration Frequency must be 120Hz or Greater.
Outside diameter of vibrating element to be between 20mm to 40mm. The length should
be 50mm less than mould being consolidated.
3C: Vibration of Beams - answer The diameter and the thickness of an element shall
not exceed 1/3 of the width of the mould
3C: External Vibrators - answer Minimum frequency of 60Hz
3C: Dimensions of Steel Strike off Bar - answer 6mm x 25mm x 450mm
3C: Temperature Measuring Device - answer Should be capable of reading 0°-50° C,
Accurate to 0.5°C.
3C: Reference Temperature Device - answer A reference temperature measuring
device for calibration should be accurate and readable to +-0.2°C
3C: Time Constraints - answer The moulding of specimens must occur within 20
minutes, after sampling and including transport and remixing.
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