Highway Engineering Objective Questions and Answers

134. For maximum strength and durability minimum percentage of cement, by weight is

135. Pick up the incorrect statement from the following. If water cement ratio is

A. increased, strength of concrete increases

B. decreased, strength of concrete increases

C. increased, strength of concrete is not affected

136. To indicate proper control of consistency of a freshly mixed concrete for pavement construction, the slump should be between

137. Minimum number of 50 kg cement bags per cubic metre of concrete for a mix corre-sponding to crushing strength 280 kg/cm2 at 28 days, are

138. If E is the modulus of elasticity of the concrete in kgkm2, d is the slab thickness in cm, 1.t is the Poisson's ratio for the concrete, k is the sub-grade modulus kg/cm3, the radius r of relative stiffness in cm,

139. When load is applied on concrete pavement

A. away from edges, the maximum bending moment is negative

B. away from edges, the maximum bending moment cause compression

C. on the edges, the maximum stress is parallel to the edge of the slab

D. none of these.

Discussion

140. If d is the thickness of a concrete pavement, the equivalent radius b of resisting section for an interior loading, is

A. b = 10.6 + d2 - 0.675 d

B. b = 1.6 + d2 + 0.675 d

C. b =-111.6 + d2 - 3.675 d

D. b = /1.6 + d2 - 0.675 d.

Discussion

Civil Engineering Objective Questions { Highway Engineering }