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The construction joints in cement concrete:
should not be provided at the corners
should be spaced at a distance of 3m apart in case of huge structures
should be located where shear force is large
should be located where bending moment is large
The fineness modulus of an aggregate is roughly proportional to:
average size of particles in the aggregate
grading of the aggregate
specific gravity of the aggregate
shape of the aggregate
The aggregate is said to be flaky when:
its length is equal to 1.8 times its mean dimension
its length is equal to its mean dimension
its least dimension is equal to its mean dimension
its least dimension is three fifth of its mean dimension
The soundness of cement is tested by:
Vicat’s apparatus
Le Chatelier’s apparatus
Compression testing machine
Standard briquette test
In lime concrete, lime is used as:
admixture
binding aggregate
fine aggregate
coarse aggregate
The minimum quantity of cement content needed in one m$$^3$$ of a reinforced concrete which is exposed to sea weather conditions is (in kg):
350
200
250
300
Shrinkage in concrete increase its:
bond strength
compressive strength
flexural strength
tensile
The strength of concrete mainly depends on:
quality of fine aggregate
water cement ratio
fineness of cement
quality of course aggregate
Green concrete may be made by adding:
iron hydroxide
barium manganate
iron oxide
chromium oxide
Gypsum is added to cement in small quantity to:
control initial setting time
control final setting time
give colour to the cement
make cement hydrophobic
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