CCIL Concrete Exam Questions And Answers 100% Verified.
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Course
CCIL
Institution
CCIL
CCIL Concrete Exam Questions And
Answers 100% Verified.
Procedure for sampling plastic concrete includes - answerEvery precaution that will assist in
obtaining samples that are truly representative of the nature and conditions of the concrete
When sampling from a truck agitator or truck mixer, ...
CCIL Concrete Exam Questions And Answers 1 00% Verified. Proced ure for sampling plastic concrete includes - answer✔✔Every precaution that will assist in obtaining samples that are truly representative of the nature and conditions of the concrete When sampling from a truck agitator or truck mixer, - answer✔✔The sample shall be taken between the 10% and 90% points of the discharge Grab Sampling - answer✔✔The operation of securing at one point of the discharge the required volume of representative material in as short a period of time as possible. Sampling for uniformity of mixed concrete includes: - answer✔✔Obtaining three grab samples of concrete for comparative purposes while the mixer is being emptied and keep the samples separate to represent the designated portions in the batch rather than combined to form a composit e sample. When 100 mm x 200 mm cylinders are to be cast: - answer✔✔A minimum 20 L sample shall be obtained. When 150 mm x 300 mm cylinders are to be cast: - answer✔✔A minimum 30 L sample shall be obtained. When 150 mm x 150 mm x 535 mm cylinders are to be cast: - answer✔✔A minimum 55 L sample shall be obtained. For more than three cylinders or beams, the minimum volume shall be increased - answer✔✔By a value equal to the volume of the extra specimens, plus 10%. Sampling shall by performed - answer✔✔By passi ng a receptacle completely through the discharge stream or by completely diverting the discharge into a sample container. The sample shall be obtained, transported, and remixed - answer✔✔Within 10 minutes. The sample shall be protected - answer✔✔From sun, wind, and other sources of rapid evaporation and from contamination. When the concrete contains aggregate larger than that appropriate for the size of the moulds or equipment to be used, - answer✔✔the sample shall be wet sieved prior to testing. For all de nsity tests, an unsieved sample shall be used. Do not use cardboard moulds: - answer✔✔When the specified concrete strength is greater than 35 MPa. Rectangular moulds: - answer✔✔Should be at least 50 mm longer than the length of the span. Moulds shall be watertight and made of rigid, nonabsorbent material. Tamping rod for 100 x 200 mm cylinders - answer✔✔Straight steel 10 + - 1 mm in diameter and betwe en 450 and 600 mm in length, having at least one end rounded to a hemispherical tip. Tamping rod for cylinders 150 mm in diameter or greater - answer✔✔Straight steel 16 + - 1 mm in diameter and between 450 and 600 mm in length, having at least one end round ed to a hemispherical tip. The frequency of vibration of an internal vibrator shall be a minimum of - answer✔✔120 Hz The outside diameter of the internal vibrator shall be - answer✔✔20 to 40 mm The minimum length of the internal vibrator shall be - answer✔✔50 mm less than the height of the mould being consolidated For vibration of cylinders, the ratio of the diameter of the cylinder to the diameter of the vibrating element shall be - answer✔✔4.0 or higher For vibration of beams, the diameter of the vibratin g element or thickness of a square vibrating element shall not exceed - answer✔✔One third of the width of the mould External vibrators, if required, shall be of the table or plank type, and have a minimum frequency of - answer✔✔60 Hz Weight of the rubber r awhide mallet - answer✔✔0.6 + - 0.3 kg Steel strike bar dimensions - answer✔✔6 mm x 25 mm x 450 mm Water storage tanks shall be kept at a temperature of - answer✔✔23 +- 2 C Manual temperature recordings of water storage tanks shall be taken - answer✔✔Twice daily, at least 5 days per week The water in the storage tanks shall be saturated with - answer✔✔Calcium hydroxide To maintain saturation in water storage tanks, - answer✔✔Excess calcium hydroxide shall be present Water storage tanks shall be cleaned and r efilled with water containing - answer✔✔3 g/L of calcium at intervals not to exceed 24 months
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