Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

3. Section-400
6. The thickness of single compacted layer should not be more than 100 mm with smooth wheel
roller and 200 mm with vibratory roller.
B. Quality Control Requirements
1. Materials
The material shall be crushed rock. If crushed gravel/ shingle is used, not less than 90% by weight
of the gravel/shingle pieces retained on 4.75 mm sieve shall have at least two fractured faces. The
aggregate shall conform to the physical requirements and grading indicated in Tables 411.1 and
411.2
TABLE 411.1: PHYSICAL REQUIREMENTS OF AGGREGATES
Test Test Method Requirements
1 Aggregate Impact Value. IS:2386 (Part 4) or IS:5640 30 Maximum
2 Flakiness Index IS: 2386 (part 1) 25 Maximum
3 Water Absorption.* IS:2386 (Part 3) 2% maximum
4 Liquid limit of material passing 425 micron. IS:2720 (part 5) Not more than 25
5 Plasticity Index of material passing 425 micron. IS:2720 (Part 5) Not more than 6
*If the water absorption is more than 2 percent, the Soundness test should be carried out as per IS:2386 (Part 5)
2. Horizontal Alignment: As per Sub-section 406
3. Surface Level
The tolerance in surface levels of crusher run macadam base shall be (±) 10 mm for machine laid
and (±) 15 mm for manually laid course.
4. Surface Regularity
TABLE 411.2: AGGREGATE GRADING REQUIREMENTS
IS Sieve Designation Percent Passing by weight
53 mm Max. size 37.5 mm Max. size
63 mm 100
45 mm 87-100 100
22.4 mm 50-85 90-100
5.6 mm 25-45 35-55
600 micron 10-25 10-30
75 micron 2-9 2-9
The maximum allowable difference between the pavement course and a 3 m straight edge shall
not exceed 12 mm for longitudinal profile and 8 mm for cross profile respectively.
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