422 SECTION 817
817.01 Salvaged Base Course
A.General. Salvage base course must include a minimum of 30 percent of one or more of the following materials: − existing bituminous material; − existing concrete material; − stockpiled bituminous material; and − stockpiled concrete material. The remaining portion of the salvage base material may be composed of the following materials: − virgin aggregate; − existing aggregate base; − existing bituminous material; − stockpiled bituminous material; − existing concrete material; and − stockpiled concrete material. The total amount of bituminous material in salvaged base course is limited as specified in Section 817.01 D, “ Salvage Base Course Containing Bituminous Material ”. If seeking to substitute virgin aggregate in lieu of sal vaged base course, submit a written request, including a detailed justification. If the request is approved, the virgin material must meet the requirement of class 5 aggregate as specified in Section 816.02, “Miscellaneous Aggregates” . If the quantity of removed material exceeds the amount of salvaged base course needed for the work, dispose of the excess material in accordance with Section 107.17, “Removed Material” . Produce salvaged base that is free of reinforcing steel, soil, scoria, and other deleterious materials.
B.Salvaged Base Course Gradation. Sieve Size Percent Passing 1-1/2 inch 100 1 inch 90 - 100 No. 4 35 - 85 No. 30 16 - 50 No. 200 0.0 - 12.0
C.Virgin Aggregate for Blending with Salvage Base Course. Provide virgin aggregate meeting the requirements of Class 5 aggregate in Section 816, “Aggregates” when blending with salvage base course.
D.Salvage Base Course Containing Bituminous Material.
1.General. If salvaged base course is to be placed beneath a concrete surface, the salvaged base course may be composed of 100 percent recycled bituminous material. If salvaged base course is to be placed beneath a bituminous asphalt surface or used as a final surfacing, the following specifications apply.
2.Blending Bituminous Material Obtained from the Work. If using bituminous material salvaged from the work, create blended material that is between 30 and 50 percent salvaged bituminous material, by weight of the blended stockpile.
3.Existing Bituminous Material Stockpiles. If using stockpiled bituminous material, limit the amount of asphalt binder material in the stockpile using one of the following methods:
a.Extraction Test Method. Obtain three samples of the material in accordance with ND T 2 under the supervision of the Engineer. The Engineer will take possession of the samples and determine the amount of asphalt binder in stockpile. The Engineer will determine the percentage of asphalt binder in the stockpile in accordance with AASHTO T 164 and average the results obtained from the three samples. The material will be rejected if any single sample has a value greater than 4.0 percent or the average extraction is greater than 3.5 percent. If the stockpile is rejected, the stockpiled material may be blended with other material.
b.Blending by Weight. Create blended material that is betw een 30 and 50 percent bituminous material, by weight of the blended stockpile.
818.01 General Requirements
At the time of delivery, submit a certificate of compliance for each car and tank truck of material. In addition to the requirements of Section 106.01 C, “Certificate of Compliance” , provide the following information on each certificate of compliance:
1.Destination;
2.Gross, Tare, and Net Weights if Shipped by Truck;
3.Car Initials and Number or Tank Truck Number;
4.Type and Grade of Bitumen;
5.Date of Shipment; and
6.Specific Gravity.
818.02 Specific Requi Rements
A.Performance Graded (PG) Asphalt Cement. If the Performance Graded (PG) asphalt cement called for in the plans contains an S, H, V, or E designation, use PG asphalt cement that meets AASHTO M 332 Base asphalt may be modified with Polyphosphoric Acid (PPA). PPA may make up no more than 0.50 percent of the finished binder, by weight. The Engineer will accept PG asphalt according to the Combined State Binder Test Group procedures. Under the observation of the Engineer, obtain one s ample for every 250 tons of material for each supplier and grade of asphalt cement, or fraction thereof.
B.Rapid-Curing Cutback Asphalt. Use rapid-curing cutback asphalt that meets AASHTO M 81.
C.Medium -Curing Cutback Asphalt. Use medium -curing cutback asphalt that meets AASHTO M 82.
D.Slow -Curing Cutback Asphalt. Use slow -curing cutback asphalt that meets ASTM D 2026, except that the minimum flash point for the SC 800 shall be 240°F.
E.Cationic Emulsified Asphalt.
1.Cationic Emulsified Asphalt. Use cationic emulsified asphalt that meets the requirements of AASHTO M 208.
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Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 457–458 of 550. View official source ↗