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271.

After the curing of 28 days, the concrete gains strength upto

A.	40%	B.	67%
C.	100%	D.	122%

272.

Proper curing of cement concrete, is good for its

A.	volume stability	B.	strength
C.	wear resistance	D.	all of these

273.

Under normal circumstances, the beam soffits may be removed after

A.	2 days	B.	7 days
C.	14 days	D.	21 days

274.

Vertical sides of columns may be stripped after

A.	1 to 2 days	B.	7 days
C.	14 days	D.	21 days

275.

In concrete walls, construction joints should be provided at the

A.	floor level	B.	soffit level of lintels
C.	sill level of windows	D.	all of these

276.

The construction joints in cement concrete

A.	should be located where bending moment is large	B.	should be located where shear force is large
C.	should not be provided at the corners	D.	should be spaced at a distance of 3 m apart in case of huge structures

277.

The construction joints are generally provided in concrete

A.	roads	B.	retaining walls
C.	lining of tunnels	D.	all of these

278.

The most useless aggregate is, whose surface texture is

A.	smooth	B.	glossy
C.	granular	D.	porous

279.

The bulk density of aggregates depends upon its

A.	shape	B.	grading
C.	compaction	D.	all of these