4127.01DESCRIPTION
Crushed stone, gravel, slag, sand, and filler from an approved source. Crushed gravel may be used to satisfy crushed particle and friction requirements for flexible paving mixtures. Produce crushed gravel as a separate operation by crushing the portion of a gravel aggregate retained on a screen at least 1/4 inch larger than the sieve size that 100% of the gravel will pass after crushing.
4127.02COARSE AGGREGATE
Meet the requirements of Table 4127.02-1:
4127.03
Aggregate for Flexible Paving Mixtures
Table 4127.02-1: Coarse Aggregate Quality (Flexible Paving Mixtues) Type B Type A Coarse Aggregate Maximum % Maximum Test Method Quality % Primary Other Abrasion
Absorption(a)
6.0
6.0
6.0
Alumina(b, c)
1.0
1.5
1.8
A Freeze
Clay Lumps/Friable Particles
2.0
3.0
3.0
(b) (c)
Materials I.M. 368
Iowa DOT Materials Laboratory Test Method No. 215 When a coarse aggregate for use in asphalt fails absorption using Iowa DOT Materials Laboratory Test Method No. 201; absorption determined by Materials I.M. 380 (Vacuumsaturated specific gravity & absorption) will be used. The 6.0% maximum absorption applies. If the Alumina value passes, the A-Freeze is not needed for specification compliance. If the Alumina value fails, determine the A Freeze value for specification compliance. Alumina does not apply to gravel.
Organic Material (a)
AASHTO T 96 Iowa DOT Materials Laboratory Test Method No. 201 Iowa DOT Materials Laboratory Test Method No. 222 Iowa DOT Materials Laboratory Test Method No. 211, Method A
4127.03 A.
0.01
0.01
0.01
FINE AGGREGATE. Natural sand meeting the requirements of Table 4127.03-1. A gradation for wearing course mixture of no more than 50% retained between two consecutive standard sieves below the No. 4 sieve or gravel aggregate with 100% passing the 3/8 inch sieve meeting these requirements. Table 4127.03-1: Fine Aggregate Quality (Flexible Paving Mixtures) Type A Type B Fine Aggregate Maximum Maximum Test Method Quality % % Iowa DOT Materials Organic Matter 0.01 0.01 Laboratory Test Method No. 215 Clay Lumps/Friable Particles
1.5
3.0
Materials I.M. 368(a)
Shale
2.0
5.0
Materials I.M. 344
B.
Crushed gravel or stone processed from coarse aggregate meeting the requirements of Article 4127.02.
Revetment Stone, Erosion Stone, and Gabion Stone
4127.04
4130.01
COMBINED AGGREGATES.
A.
Use aggregate, which does not contain adherent films of clay or other matter that will prevent coating of particles with asphalt binder. Meet gradations of Materials I.M. 510.
B.
Coarse and fine aggregate shall meet quality requirements of Articles
and 4127.03 before combining aggregates
4127.05MINERAL FILLER
For fine material added to the mixture, separate from cold feed, meet the requirements for mineral filler in AASHTO M 17, except determine the gradation according to AASHTO T 11.