The average 28 days compressive strength of at least three 15 cm concrete cubes prepared with available water as compared to the average strength of three similer concrete cubes prepared with distilled water, should be at least
Options
A. 70%
B. 80%
C. 90%
D. 95%
Correct Answer
90%
Structural Design Specifications problems
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1. The maximum bending moment in a purlin of length L when subjected to a distributed load ?, is assumed
4. The ratio of the effective length to the least radius of gyration of a tie member of a roof truss, which gets subjected to reversal of stress shall not exceed
5. Pick up the correct statement applicable to cased columns.
Options
A. Single I-beam or channels back with or without flange plates may be used
B. The overall dimensions of the steel section do not exceed 750 x 450 mm over plate if used
C. The column is unpainted and is solidly encased in ordinary dense concrete with 10 mm aggregates having a minimum of cube strength 160 kg/cm2 at 28 days
D. The surface and edges of the steel column should be provided a concrete cover not less than 50 mm
9. If b is the width of a beam, x is the spacing of the stirrup and fc is the characteristic strength of stirrups, the minimum cross sectional area of stirrup legs, should be equal or greater than
