1.Curing of pavements, floors, roofs and slabs, is done by-Ponding method
2.The centroid of compressive force, from the extreme compression
fiber, in limit state design lies at a distance of-0.416 xu
Where xu is the depth of neutral axis at the limit state of collapse
3.The bulk density of aggregates, depends upon- (A) Shape, (B) Grading, (C) Compaction
4.In symmetrically reinforced sections, shrinkage stresses in concrete
and steel are respectively-Tensile and compressive
5. Cold drawn wires - has high tensile strength.
Cold drawn wires
6.Concrete gains strength due to-Hydration of cement
7.To determine the modulus of rupture, the size of test specimen
used is-150 × 150 × 700 mm
8.Tricalcium aluminate (C3A)-Generates less heat of hydration
9.If the various concrete ingredients i.e. cement, sand and
aggregates are in the ratio of 1:3:6, the grade of concrete, is-M 10
10.Admixtures which cause early setting and hardening of concrete
are called-Accelerators
11.For a reinforced concrete
section, the shape of shear stress diagram is-Parabolic above neutral axis and rectangular below neutral axis
12.Allowable shear strength of concrete, depends upon-Shear strength
13.In slump test, each layer of
concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for-25 times
14.The individual variation between test strength of sample should
not be more than - ± 15 % of average
15.For performing compressive strength test of Cement-Cement and standard sand mortar are used in the ratio of 1 : 3
