ACI Concrete Field Testing Technician - Grade 1 (Canada) 100% Accurate.

The standard practice describes the _____ _____ and _____ required to obtain a representative sample of fresh concrete and to assess its tractability to the structure it represents. - ANSWER procedures, location and sample size The procedures used in sampling shall include the use of every precaution that will assist in obtaining samples that are truly representative of the _____and _______ of the concrete. - ANSWER nature, conditions Intermittent scooping of the sample in shovelfuls or bucketfuls into a wheelbarrow or tray as the concrete continues to flow down the delivery chute is an acceptable technique? - ANSWER False The concrete sample must be protected at all times from sun, wind,____and - ANSWER rapid evaporation, contaminants the minimum size sample for making strength test cylinder specimens is - ANSWER 20l for 100x200mm 30l for 150x300mm 55l when 3 flexural beams are made When sampling for uniformity of mixed concrete____grab samples shall be obtained from widely separated portions of the batch during discharge - ANSWER Three The sample form a mixer must be obtained between the ____% and ____%points of the discharge - ANSWER 10, 90 When the concrete contains aggregate whose nominal size is larger than that permitted for a particular test method, the sample of concrete must be _____before making the test(except for Density tests) - ANSWER Wet Sieved(over the appropriate sieve size) Air content (pressure method) measurement and slump must both be completed within___minutes of transporting and remixing of the sample - ANSWER 10 Moulding of concrete strength cylinders must b e completed within____minutes after the sample has been transported and remied. - ANSWER 20 What document produced by the concrete supplier contains information relating to identification of the concrete sample? - ANSWER The delivery ticket Describe the operation of obtaining a sample for evaluation of concrete quality. - ANSWER Obtain a single grab sample at one point of the discharge in as short a time as possi