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Home / DOT Specifications / Pennsylvania / Publication 408 — Specifications / 312
Base Courses (300-399)

312CRUSHED AGGREGATE BASE COURSE, TYPE DG

PA · 2026 Standard SpecificationsBook pages 221–222View official source ↗

341.1 341.2(g)

341.1DESCRIPTION —This wo rk is the on -grade construction and material processing of a cold recycled

asphalt base course ( CRABC ) that uses emulsified asphalt , or foamed asphalt stabilizing agents, combined with RAP, RAM, cement, or virgin aggregates. Construction typically includes milling to an indicated depth, adding and mixing emulsified asphalt or foamed asphalt , placing, compacting, and testing.

341.2MATERIAL —

(a)Reclaimed Material. Reduce oversized material until 95 % of the material passes the 2 -inch sieve.

Incorporate all reclaimed material into the CRABC .

1.RAM. As specified in Section 703.1, Table A or 703.2, Table B. The Contractor may use RAM from

the project or from stockpiles off the project.

2.RAP. Processed paving material containing asphalt and aggregates.
(b)Asphalt Material. Furnish PG 64S -22, PG64V -22, PG64E -22, PG 58S -28, or PG 58 V-28 material

conforming to AASHTO M 332, for Performance -Graded Asphalt Binder using Multiple Stress Creep Recovery

(MSCR)Test, except as revised in Bulletin 25. Obtain material from a source listed in Bulletin 15 for the

specified grade. Provide QC testing and certification as specified in Sections 106.03(b) and 702.1(b)1. Provide the Representative a copy of a signed Bill of Ladi ng for asphalt binder on the first day of paving and when the batch number changes.

(c)Emulsified Asphalt Material . Add emulsified asphalt material to the reclaimed material according to

the approved mix design. Use one of the following emulsified asphalt materials, conforming to the applicable requirements of Bulletin 25:

• Emulsified Asphalt —MS-2, CMS -2, SS -1, CSS -1, SS -1h, CSS -1h, HFMS -2h, HFMS -2, HFMS -2s, HFMS -2P, SS-1hP, CSS -1hP.

(d)Portland Cement. Section 701
(e)Aggregate. Section 703.2 Type A, AASHTO No. 8, No. 57, or No. 67.
(f)Mixture Design.
(1)Emulsified Asphalt Stabilizing Agent . Obtain samples of each reclaimed material and perform

testing to establish the mix design. If RAM is included in the depth indicated for removal, take separate samples of RAP and RAM. Establish the mix design according to Bulletin 27 and submit the mix design as specified in Section 108.03 (b)3.

(2)Foamed Asphalt Stabilizing Agent . Obtain samples of each reclaimed material and perform

testing to establish the mix design according to AASHTO MP 38 and submit the mix design as specified in Section 108.03(b)3. Perform the mix design using the asphalt material performance grade and supplier that will be used during the project . If there is a change in source or grade of the asphalt material , a new mix design is required.

(g)Mixture. Combine the reclaimed material, aggregates, and emulsified asphalt or foamed asphal
Source: Pennsylvania Department of Transportation Specifications, 2026 Edition. Pages 221–222 of 1,522.
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313 SUPERPAVE ASPHALT MIXTURE DESIGN, STANDARD CONSTRUCTION, BASE COURSE