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  Welcome friends, We shall learn about the various questions which are frequently ask by an  interviewer In the field of infrastructure.  So let's get start....... EMBANKMENT/SUBGRADE/BORROW AREA •Liquid Limit  <50% •Plastic Limit  < 25% •Proctor Density(Min. Value) For Embankment =1.52 to 1.60 gram/cubic centimeter For Subgrade= 1.75 gram/ cubic centimeter Sub-grade top • Field Dry Density (FDD) For Embankment= min. 95% For Sub grade = min. 97% •Number of test For Embankment = 1set/3000 sq.meter(1set=10pits) For subgrade= 1set/2000 sq.meter (1 set=10 pits) GRANULAR SUB- BASE •Maximum thickness of single compacted layer = 200 mm • Minimum thickness of single compacted layer( only when GSB is laying in two layers) = 150 mm •Max. Allowable size of aggregate =75mm •Number of grading of GSB = 6 •Liquid limit  should not be  more than 25% ( test procedure as per IS 2720 (part 5)). •Plasticity ind...

STRUCTURE DEPARTMENT MOST IMPORTANT INTERVIEW QUESTIONS specification related to concrete • Allowable free fall height of concrete = 1.5 meter • Minimum thickness of slab = 125mm •Tolerance limit of cube= +2mm • Number of cubes required with respect to concrete quantity •Grades of concrete •Min. Concrete deposition temperature= 5°C • Max. Concrete deposition temperature= 30°C ( in no case 40°C) •Density of PCC(plain cement concrete) = 2400KG/cubic meter • Density of RCC = 2500KG/cubic meter •Concrete placing time when it has been discharged from Transit Mixer(Agitator)=30 minute • Size of cube = 0.150 * 0.150 * 0.150 ( All dimensions are in meter)  =150 * 150 *150 (All dimensions are in mm) •Fly ash when used, Shall neither be less than 20% nor shall be greater than 30% of the total by mass of OPC and fly ash and shall be conform to grade - 1of IS:3812 specification related to Reinforcement ( Re- bar) •Requirement of Binding wir...

RCC (Reinforced cement concrete) Column/Strut All details about the Column (a compression member in structure) Column -Reinforced concrete columns are used to transfer the load of the structure to its foundations. These are reinforced by means of main longitudinal bars to resist compression and/or bending; and transverse steel (ties) to resist bursting force. The column or strut is a vertical compression member, the effective length of which exceeds three times its least lateral dimension(LLD). (A) LongItudInaI Reinforcement- In a reinforced column, the area of longitudinal reinforcement shall not be less than 0.8 percent nor more than 6 percent of the gross cross-sectional area of the column. The area of longitudinal reinforcement should normally not exceed 4  percent of the gross cross sectional area of the column. This percentage can  be considered as the maximum from practical considerations. However where bars from one column have to be lapped w...