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WorksheetsDay 89-Dec 26-Diploma-worksheet-Mix composition&Special concrete
Total questions: 15
Worksheet time: 11mins
As per IS 456, concrete grades less than M20 are classified as:
Design mix
Standard mix
Nominal mix
Special concrete
The reference code for concrete mix proportioning is:
IS 456
IS 10262
IS 383
IS 2386
The mix proportion of M20 nominal concrete is:
1 : 2 : 4
1 : 3 : 6
1 : 1.5 : 3
1 : 4 : 8
The target mean compressive strength is calculated using the expression:
fck−1.65s
fck+s
fck+1.65s
fck+2s
For severe exposure condition (plain concrete), the maximum free water–cement ratio permitted is:
(a)
For every additional 25 mm increase in slump, the increase in water content should be:
(a)
Which concrete uses polymer as binder instead of cement?
(a)
Lightweight concrete always contains lightweight fine aggregates only.
True
False
Aspect ratio of fibres is defined as length divided by diameter.
True
False
Assertion (A): Fibre reinforced concrete improves ductility of concrete.
True
False
Concrete grade greater than M20 is classified as ______ mix.
Design mix
Nominal mix
Standard mix
Trial mix
The assumed standard deviation for M35 concrete as per IS 10262 is (a) .
Target compressive strength depends on characteristic strength and (a)
For extreme exposure condition, the minimum grade of concrete is (a) .
Maximum water content for 20 mm aggregate is (a) kg/m^3.
