Concrete Technology (81-100)

Updated: Apr 10, 2020

81. The limits of percentage p of the longitudinal reinforcement in a column is

given by 0.8% to 6%


82. The minimum diameter of longitudinal bars in a column is 12 mm

83. The minimum cover to the ties or spirals should not be less than 25 mm


84. The load carrying capacity of a helically reinforced column as compared to that of a tied column is about 5% more


85. A reduction factor Cr to load carrying capacity of a long column is given by






86. The diameter of ties in a column should be more than 5 mm and also more than one-fourth of diameter of main bar


87. Due to circumferential action of the spiral in a spirally reinforced column

both the capacity of column and ductility of column increase

88. Maximum percentage reinforcement in case of slabs is limited to 4


89. Which of the following R.C. retaining walls is suitable for heights beyond 6m?

counterfort type

90. For the design of retaining walls, the minimum factor of safety against over

turning is taken as 2.0

91. In counterfort type retaining walls

i) the vertical slab is designed as a continuous slab

ii) the heel slab is designed as a continuous slab

92. A T-shaped retaining wall mainly conssits of three cantilevers


93. In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on the inner face in one direction


94. The main reinforcement in the toe of a T shaped R C. retaining wall is provided on bottom face perpendicular to the wall

95. The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining

wall is provided more on front face than on inner face


96. The main reinforcement in the heel of a T shaped R.C. retaining wall is provided on top face perpendicular to wall


97. In a counterfort retaining wall, the main reinforcement is provided on the

bottom face infrontcounterfort,inclined face in back counterEort

98. In counterfort retaining walls, the main reinforcement in the stem at support is provided only on inner face

99. In the design of a front counterfort in a counterfort retaining wall, the main

reinforcement is provided on

bottom face near counterfort,top face near centre of span

100. In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on front face only

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