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Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

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3. Section-500<br />

TABLE 504.2: PHYSICAL REQUIREMENTS FOR AGGREGATES FOR BITUMINOUS MACADAM<br />

Property Test Specification<br />

Particle Shape Flakiness Index IS:2386 Part 1 Max. 25 per cent<br />

Strength Aggregate Impact Value IS:2386 Part 4 Max. 30 per cent<br />

Durability Soundness IS:2386 Part 5<br />

Loss in Weight<br />

SodiumSulphate Max. 12 per cent<br />

Magnesium Sulphate Max. 18 per cent<br />

Water Absorption Water Absorption IS:2386 Part 3 Max. 2 per cent<br />

Stripping Coating and Stripping of bitumen- aggregate Min. retained coating:<br />

mixtures IS:6241 95 per cent.<br />

In colder regions of India or where the percent passing 0.075 mm sieve is on the higher side of the range,<br />

appropriate bitumen contents may be upto 0.5 percent higher, subject to the approval of the Engineer.<br />

2. Horizontal Alignment<br />

The edges of the bituminous macadam base should be correct within a tolerance limit of (±) 30<br />

mm in plain and rolling terrain and (±) 50 mm in hilly terrain<br />

3. Surface Level<br />

The tolerance in surface level of the bituminous macadam would be (±) 6 mm.<br />

4. Surface Regularity<br />

The maximum allowable difference between the road surface and a 3 m straight edge would be 12<br />

mm <strong>for</strong> longitudinal profile and 8 mm <strong>for</strong> cross profile.<br />

5. <strong>Quality</strong> Control Tests<br />

5.1 Tests Prior to Construction<br />

TABLE 504.3: COMPOSITION OF BITUMINOUS MACADAM<br />

IS Sieve (mm) Cumulative Per cent Passing<br />

by weight of Total Aggregate<br />

26.5 100<br />

19 90-100<br />

13.2 56-88<br />

4.75 16-36<br />

2.36 4-19<br />

0.03 2-10<br />

0.075 0-5<br />

Bitumen content, % by weight of total mixture 3.3-3.5<br />

Bitumen penetration Grade 35 to 90<br />

The quality control tests to be carried out prior to construction are indicated in Table 504.4.<br />

90

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