As per IRC 58-2015 Clause 5.7.3.6 , a minimum CBR of 8 % is recommended for 500 mm of selected soil used as subgrade.
2. What is code reference from which you are performing CBR test with 3 energy level as per MORTH 5 revision ?
AASHTO Designation: T 193-99 -2003
3. What is the limit of Air Voids , flow & VFB in Dense Bituminous Macadam mix design ?
The limit of Air voids , flow & VFB is 3 -5% , 2- 4 mm & 65-75% simultaneously.
4.What should be the minimum required density of Subgrade soil as per MORT&H 5th revision ?
17.5 KN/m³ or 1.78 gm /cc
5.What is the softening point of VG 30 & VG40 grade bitumen ?
The softening point of VG30/VG 40 grade bitumen is 47 ºC / 50ºC
6.What will be the maximum allowable size of granular material for subgrade soil as per MORT&H specification ?
Allowable size of granular material in subgrade is 50 mm
7.What is the maximum Liquid Limit & Plasticity Index allowed in earth work in embankment/subgrade soil ?
Clay should have Liquid Limit less than 50 % & PI should always be less than 25 %.
8.What is the frequency of taking core for BM/DBM/BC for checking of compaction & thickness of laid layer as per MORT&H 5th revision ?
One core at 700 m²
9.What is the maximum Aggregate Impact Value of aggregate allowed for Bituminous concrete(BC) work in flexible pavement ?
AIV should not be more than 24%.
10.What is the minimum cement content & maximum W/C ratio for M 25 RCC concrete for moderate condition as per MORT&H 5TH Revision ?
Minimum Cement Content 340 Kg & Maximum W/C ratio is 0.45
11.What is the density frequency of compacted layer in Embankment & subgrade/Shoulder ?
1 set of 10 test for 3000 m² of Embankment / 1 set of10 test for 2000 m² of Subgrade/Shoulder.
12.What is difference between Specific Gravity & Density ?
Bulk density is the ratio between soil weight to the total volume of the soil but Specific Gravity (G) is the ratio of the weight in air of a given volume of soil solids at a stated temperature to the weight in air of an equal volume of distilled water at that temperature . Specific gravity has no unit and it is generally used in design of concrete/bituminous mix.
13.What is the maximum Aggregate Impact Value of aggregate for concrete work ?
45%
14.What is the rate of spray of Prime Coat over WMM ?
0.7 -1.0 kg/m²
15.Which IS code specified the specification of aggregates ?
IS 383-2016
16.How much Kinetic Viscosity of VG 40 bitumen is ?
The Kinematic Viscosity of VG 40 grade bitumen is 400 cst minimum at 135 º C
17.What is the dry density of WMM & GSB material in your project ?
The density of WMM/GSB in our project is 2.23 /2.24 gm/cc
18.What is the minimum cement content & maximum W/C ratio for Pile concrete as per IRC 78 -2014 Cl 709.1.9 ?
Minimum amount of cement content 400 kg/m³ & maximum W/C ratio is 0.40
19. What will be the minimum cement content as per IRC SP 49 2014 for DLC mix design ?
140 kg / m³
20.How many samples you take for 900 m² of DLC laying ?
3 samples (9 Cubes)
What is the Nominal size of aggregate for grade 1 Bituminous Concrete?
19 mm
What is the maximum limit of FI+EI for Dense Bituminous Macadam as per MORT& H 5th revision ?
Maximum FI+EI limit is 35%
What is setting time RS1 & SS1 Emulsion?
15 to 30 minutes for RS1 & 24 hours for SS1
How many cube mould required for 110 m³ concrete ?
4 +1+1=6 samples means 18 cubes as IS 456-2000
As per MORT&H 5th revision how many grades of GSB are there?
Six grades are there.
No comments:
Post a Comment