CCIL Section 3C, 5C EXAM WITH ANSWERS VERIFIED 100%

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

3C: Rectangular Moulds - 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... - 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... - Steel Straight bar, 16mm +- 1mm in diameter, not less than 450mm nor more than 600mm in length and one hemispherical tip.

3C: Internal Vibrators - 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 - The diameter and the thickness of an element shall not exceed 1/3 of the width of the mould

3C: External Vibrators - Minimum frequency of 60Hz

3C: Dimensions of Steel Strike off Bar - 6mm x 25mm x 450mm

3C: Temperature Measuring Device - Should be capable of reading 0°-50° C, Accurate to 0.5°C.

3C: Reference Temperature Device - A reference temperature measuring device for calibration should be accurate and readable to +-0.2°C

3C: Time Constraints - The moulding of specimens must occur within 20 minutes, after sampling and including transport and remixing.

3C: Relation of specimen size and aggregate size - The minimum cross sectional dimension must be atleast three times the max nominal size of the course aggregate in the concrete.

3C: Place of Moulding - They must be stored in level, rigid surface, free of vibration and other disturbances where they are stored for 28 hours +-8h.

3C: Methods of Consolidation for slump greater than 40mm - Rodding

3C: Methods of Consolidation for slump equal to or less than 40mm - Vibration

3C: A Concrete with a specified slump of 80mm or less - May be consolidated by vibration when agreed to by all parties

3C: Placing the Concrete - The concrete shall be placed in two or three equal layers.

3C: Strength specimens of less than 35 MPA - Must have no depressions or projections larger than 3mm.

3C: Strength specimens of = to or greater than 35 MPA - Must have no depressions greater than 1mm.

3C: Test Specimens - Must have length twice the size of the diameter.

3C: Rodding - Rodding should penetrate 25mm into the underlying layer, and the sides of the mould should be tapped lights 10 to 15 times with a mallet.

3C: Superplasticized mixed with a specified slump greater than 180mm shall be consolidated by? - 40% of the number of strokes required.

3C: Strokes, Rod Diameter and number of layers for 100, 150, 200 and 250 diameter cylinders - 20, 10, 3
25, 16, 3
50, 16, 3
75, 16, 3