Both the materials and the source of the supply must be approved by the Engineer or the designated representative of the Engineer prior to the delivery of any materials.
(Ordinance 2007-106, App. B, adopted 3/20/07)
A.
Bituminous Materials.
Bituminous materials for the surfacing shall be 120-250 penetration asphalt cement. The Engineer or the designated representative of the Engineer will designate the asphalt penetration to be used. The asphalt material specified herein shall be either a naturally homogenous oil or a homogenous residue from oil. It shall not have been distilled at a temperature high enough to injure the oil, and shall not foam when heated to 347° F. It shall be free from water and shall meet the following requirements:
A.A.S.H.T.O. | ||||
|---|---|---|---|---|
Test Method | 135 | 175 | 230 | |
Penetration at 77° F, 100 gms. 5 sec. | T-49 | 120–150 | 150–200 | 210–250 |
Ductility at 77° F, cms., not less than | T-51 | 100 | 70 | 70 |
Flash Point, degrees F, not less than | T-79 | 450 | 450 | 450 |
Melting Point, degrees F | T-53 | 104–140 | 95–130 | 86–122 |
Solubility in Carbon Tetrachloride not less than | T-44 1 | 99.5% | 99.5% | 99.5% |
Loss on heating at 325° F 5 hrs. not more than | T-47 | .75% | .75% | .75% |
Penetration of residue from loss on heating 77° F, 100 gpms., 5 sec. as compared to penetration before heating not less than | T-49 | 70% | 90% | 125% |
Oliensis Spot Test | T-102 | Neg. | Neg. | Neg |
1 Except CCL 4 is used instead of CS 2 |
B.
Precoated Aggregate.
The aggregate shall be composed of sound and durable particles of gravel or stone, shall be free from organic matter, clay, loam, or pebbles coated therewith, and shall not contain more than five (5) percent of slate, shale, schist, or soft particles of sandstone. No local caliche or other material and dust coated character shall be used. The material shall be of source proven satisfactory for this use. When tested by approved laboratory methods, each shall meet the requirements specified below:
SEAL COAT | ||
|---|---|---|
Aggregate - | Retained on 3/8" screen..... | 0% |
Retained on 1/4" screen..... | 2-20% | |
Retained on 10 mesh sieve..... | 70–100% | |
Retained on 20 mesh sieve..... | 95–100% | |
The natural limestone rock asphalt aggregate shall have an average bitumen content from 4 to 8 percent by weight of naturally impregnated asphalt, as determined by Test Method Tex-215-F, and shall contain not more than 2 percent by weight of any one of or combination of iron pyrites or other objectionable matter, as determined by Test Method Tex-217-F, Part I.
The percent of wear, as determined by Test Method Tex-410-A, for each of the materials shall not exceed 35 percent.
The percent of wear on natural limestone rock asphalt aggregate as determined by Test Method Tex-410-A shall be made on that portion of the material retained on the No. 4 sieve, having a naturally impregnated asphalt content of less than 1 percent.
Crushed gravel shall have a minimum of 85 percent of the particles retained on the No. 4 sieve with more than one crushed face, as determined by Test Method Tex-413-A (Particle Count).
(Ordinance 2007-106, App. B, adopted 3/20/07)