CCIL COMPREHENSIVE EXAMS UPDATED
QUESTIONS AND ANSWERS SURE A+
✔✔Tamping Rod for 100mm x 200mm cylinders - ✔✔Diameter 10mm +/- 1mm and a
Length of 450mm to 600mm. One end must be hemispherical.
✔✔Tamping Rod for cylinders 150mm or greater, and rectangular moulds -
✔✔Diameter 16mm +/- 1mm and a Length 450mm to 600mm. One end must be
hemispherical.
✔✔Internal Vibrator requirements - ✔✔Rigi, flexible shaft; powered by electric motor.
Frequency 120Hz or greater. Outside diameter 20mm to 40mm. Minimum height 50mm
less than specimen being consolidated.
✔✔Ratio for vibrating cylinders - ✔✔4.0 or higher
✔✔Vibrating beams - ✔✔The diameter of the element or thickness of a square vibrating
element shall not exceed 1/3 the width of the mould.
✔✔External vibrator requirements - ✔✔Table/plank type. Minimum 60Hz. Clamp mould
securely to apparatus.
✔✔Head mallet weight - ✔✔0.6 kg +/- 0.3 kg.
, ✔✔Strike-off Bar - ✔✔Steel. 6mm x 25mm x 450mm.
✔✔Water Tank temp and reading frequency and accuracy - ✔✔23 +/- 2 degrees C.
Temperatue readings must be taken twice daily and be within 0.5 degrees accuracy.
✔✔Water Tank Cleaning frequency - ✔✔When water contains 3g/L Ca at intervals not
to exceed 24 months.
✔✔Water Tank Room humidity, temp, and temp reading frequency/accuracy - ✔✔95%
or greater humidity, 23 +/- 2 degrees C, temperature readings twice daily 5 days a week
within 0.5 degrees C accuracy.
✔✔Temperature measuring range and accuracy requirement - ✔✔Devices must be able
to measure temperatures between 0 and 50 degrees C, accurate to 0.5 degrees C.
✔✔Moisture Room temp frequency and accuracy - ✔✔Temperature must be read every
15 mins by a recorder- Must be accurate to 1 degree C.
✔✔Verify temperature recorder accuracy - ✔✔Every 12 months or whenever there is a
question of accuracy
✔✔Reference Temperature Measuring Device accuracy - ✔✔Available for calibration of
other devices, MUST be accurate to +/- 0.2 degrees C. Must have certificate or
document available for view.
✔✔Specimens must be moulded within what time? - ✔✔20 minutes after sample time,
including transport and remixing.
✔✔Specimen/Aggregate Size ratio - ✔✔Diameter of a cylindrical specimen, or cross-
sectional dimension of a beam shall be at least 3 times the size of the coarse aggregate
used in the concrete.
✔✔Handpicking can be used for what/when - ✔✔Can be used to remove over-sized
aggregate before casting cylinders.
✔✔Cylinder Moulding Location/time required sitting still - ✔✔Mould closest to where
cylinders will initially cure. Must stay in cure location for 28 +/- 8 hours.
✔✔Consolidating Test Specimens (rodding or vibrate) - ✔✔Rodding used with slump
greater than 40, vibration used with slump equal or less than 40.
✔✔Placing Concrete In Moulds layer amounts - ✔✔2 or 3 lifts or layers.
QUESTIONS AND ANSWERS SURE A+
✔✔Tamping Rod for 100mm x 200mm cylinders - ✔✔Diameter 10mm +/- 1mm and a
Length of 450mm to 600mm. One end must be hemispherical.
✔✔Tamping Rod for cylinders 150mm or greater, and rectangular moulds -
✔✔Diameter 16mm +/- 1mm and a Length 450mm to 600mm. One end must be
hemispherical.
✔✔Internal Vibrator requirements - ✔✔Rigi, flexible shaft; powered by electric motor.
Frequency 120Hz or greater. Outside diameter 20mm to 40mm. Minimum height 50mm
less than specimen being consolidated.
✔✔Ratio for vibrating cylinders - ✔✔4.0 or higher
✔✔Vibrating beams - ✔✔The diameter of the element or thickness of a square vibrating
element shall not exceed 1/3 the width of the mould.
✔✔External vibrator requirements - ✔✔Table/plank type. Minimum 60Hz. Clamp mould
securely to apparatus.
✔✔Head mallet weight - ✔✔0.6 kg +/- 0.3 kg.
, ✔✔Strike-off Bar - ✔✔Steel. 6mm x 25mm x 450mm.
✔✔Water Tank temp and reading frequency and accuracy - ✔✔23 +/- 2 degrees C.
Temperatue readings must be taken twice daily and be within 0.5 degrees accuracy.
✔✔Water Tank Cleaning frequency - ✔✔When water contains 3g/L Ca at intervals not
to exceed 24 months.
✔✔Water Tank Room humidity, temp, and temp reading frequency/accuracy - ✔✔95%
or greater humidity, 23 +/- 2 degrees C, temperature readings twice daily 5 days a week
within 0.5 degrees C accuracy.
✔✔Temperature measuring range and accuracy requirement - ✔✔Devices must be able
to measure temperatures between 0 and 50 degrees C, accurate to 0.5 degrees C.
✔✔Moisture Room temp frequency and accuracy - ✔✔Temperature must be read every
15 mins by a recorder- Must be accurate to 1 degree C.
✔✔Verify temperature recorder accuracy - ✔✔Every 12 months or whenever there is a
question of accuracy
✔✔Reference Temperature Measuring Device accuracy - ✔✔Available for calibration of
other devices, MUST be accurate to +/- 0.2 degrees C. Must have certificate or
document available for view.
✔✔Specimens must be moulded within what time? - ✔✔20 minutes after sample time,
including transport and remixing.
✔✔Specimen/Aggregate Size ratio - ✔✔Diameter of a cylindrical specimen, or cross-
sectional dimension of a beam shall be at least 3 times the size of the coarse aggregate
used in the concrete.
✔✔Handpicking can be used for what/when - ✔✔Can be used to remove over-sized
aggregate before casting cylinders.
✔✔Cylinder Moulding Location/time required sitting still - ✔✔Mould closest to where
cylinders will initially cure. Must stay in cure location for 28 +/- 8 hours.
✔✔Consolidating Test Specimens (rodding or vibrate) - ✔✔Rodding used with slump
greater than 40, vibration used with slump equal or less than 40.
✔✔Placing Concrete In Moulds layer amounts - ✔✔2 or 3 lifts or layers.
