Volume-IF - JantERmantER

3.6.2.2 Aggregates
DCPL-K4A02
The Binder shall be straight run bitumen of a suitable grade as directed by the
Engineer complying with IS:73.
The aggregates shall consist of crushed stone, crushed gravel (shingle) or other
stones. They shall be clean, strong, durable, of fairly cubical shape and free of
disintegrated pieces, organic and other deleterious matter, and adherent coats. The
aggregates shall preferably be hydrophobic and of low porosity.
The aggregates shall satisfy the physical requirements set forth in Table-VI.
TABLE-VI
PHYSICAL REQUIREMENTS OF AGGREGATES
FOR BITUMINOUS MACADAM
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Sl. No. Test Test method Requirements
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1. Los Angeles Abrasion * IS:2386 35% Maximum
Value
(Part IV)
2. Aggregate Impact Value * -do- 30% "
3. Flakiness Index IS:2386 35% "
(Part I)
4. Stripping Value IS:6241 25% "
5. Water Absorption IS:2386 2% "
(Part III)
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* Aggregates may satisfy requirements of either of the two tests.
The aggregates for bituminous macadam for different thicknesses shall conform to
the grading A or B given in Tables VII & VIII.
TABLE-VII
AGGREGATES GRADING FOR 75 MM COMPACTED
THICKNESS OF BITUMINOUS MACADAM
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Sieve
Percent by weight passing the sieve
Designation ________________________________________
Grading A
Grading B
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63 mm 100
50 mm 90-100
40 mm 35-65 100
25 mm 20-40 70-100
20 mm - 50-80
12.5 mm 5-20 -
(PCA.775.S034sca7) V.II-D2/S-VII : 15