Match the following lists with corresponding acceptability limits of physical properties of aggregates for Bituminous Macadam construction, that is recommended by the Ministry of Road Transport and Highways specifications for Road and Bridge works :
| List-I | List-II |
|---|---|
| P.Los Angeles abrasion value | 1.12% maximum |
| Q.Aggregate impact value | 2.25% maximum |
| R.Soundness loss with sodium sulphate test | 3.30% maximum |
| S.Aggregate stripping value | 4.40% maximum |
Select the correct answer using the code given below :
- A1 2 3 4
- B4 3 1 2Correct
- C3 1 2 4
- D2 1 3 4
Solution
Concept
MoRTH limits for aggregates in bituminous macadam
Step-by-step solution
1. Los Angeles abrasion value: 40% max → 4. 2. Aggregate impact value: 30% max → 3. 3. Soundness (sodium sulphate, 5 cycles): 12% max → 1. 4. Stripping value: 25% maximum (as listed in the question) → 2.
Explanation
MoRTH Table 500-8 limits the LAAV to 40 percent and the AIV to 30 percent for bituminous macadam. The sodium sulphate soundness loss is 12 percent. The remaining limit in the list, 25 percent, goes with the stripping value.
Why the other options are wrong
The other codes assign the 12% soundness limit or the 40% limit to the wrong property.
Shortcut
LAA 40, AIV 30, soundness (Na₂SO₄) 12, stripping 25.
Common mistake
Interchanging LAAV and AIV limits.
Correct answer: B) 4 3 1 2