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Procedure 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
Method of consolidation for specimens that have a slump greater than 40 mm -
ANSWER-Rodding
Method of consolidation for specimens that have a slump less than 40 mm -
ANSWER-Vibration
Method of consolidation for specimens that have a slump of exactly 40 mm -
ANSWER-Vibration
When the specified compressive strength of a flexural strength specimen is LESS
than 35 MPa, the depressions or projections can not be larger than -ANSWER-3
mm
When the specified compressive strength of a flexural strength specimen is
GREATER than or EQUAL to 35 MPa, the depressions or projections can not be
larger than -ANSWER-1 mm
What tool do you use to finish a beam? -ANSWER-Wood float
, Compression tests specimens shall be cylindrical, with a length equal to -
ANSWER-Twice their diameter
The sides of a mould shall be tapped smartly -ANSWER-10 to 15 times with a
mallet, to avoid any air bubbles
Flowing superplasticized concrete mixes with a slump greater than 180 mm shall
be consolidated with -ANSWER-40% the number of strokes per layer
If a 150 x 300 mm mould has superplasticizer in it, with a slump of 190 mm, how
many times shall it be rodded? -ANSWER-10
If a cylinder has a diameter of 100 mm, how many times shall it be rodded? -
ANSWER-20
If a cylinder has a diameter of 200 mm, how many times shall it be rodded? -
ANSWER-50
If a cylinder has a diameter of 150 mm, how many times shall it be rodded? -
ANSWER-25
If a cylinder has a diameter of 250 mm, how many times shall it be rodded? -
ANSWER-75
A vibration mould shall be filled and vibrated in how many layers? -ANSWER-2