CCIL A23.2-3C - Making and curing compression specimens Questions and Answers
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Module
CCIL
Institution
CCIL
CCIL A23.2-3C - Making and curing compression specimens Questions and Answers
When can you use cardboard moulds to cast compression cylinders?
When you satisfactory documentation indicating the cylinders produced will have compressive strengths equivalent to those obtained by rigid, non-absorbent...
when can you use cardboard moulds to cast compress
what are the specifications for an internal vibrat
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CCIL A23.2-3C - Making and curing
compression specimens Questions and
Answers
When can you use cardboard moulds to cast compression cylinders? - answer When
you satisfactory documentation indicating the cylinders produced will have compressive
strengths equivalent to those obtained by rigid, non-absorbent moulds, and if the
concrete is less than 35 MPa
What are the specifications for an internal vibrator? - answer 120Hz, diameter of
vibrating element 20mm to 40mm, length of vibrating element 50mm less than height of
mould being consolidated.
For cylindrical and beams, what are the ratio of the diameter/width to diameter of
vibrating elements? - answer For cylindrical min. ratio of 4:1, for beams max 1/3rd
the width of the beam
What are the specs for external vibrators? - answer 60Hz, with a means of clamping
the moulds securely to the apparatus. A tachometer should be used to check frequency
of vibration.
What is the temperature range for water storage tanks and moist cabinets/rooms? -
answer 23d celcius +/- 2d
How often should a temperature recorder be verified? - answer At least every 6
months or whenever there is a question of accuracy?
Reference temperature devices shall be readable and accurate to? - answer 0.2d
celcius
When does the moulding have to be complete after sampling? - answer 20 minutes
max
How long do the moulded specimens need to be stored during their initial cure? -
answer 28hr =/- 8hr
When do specimens need to be vibrated rather than rodding? - answer If the slump
is less than or equal to 40mm
When finishing specimens, what is the max allowable depression/projection? - answer
3mm for less than 35MPa, 1mm for 35MPa or greater.
How far down should the rod penetrate the layer below? - answer 25mm
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