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Home / DOT Specifications / Pennsylvania / Publication 408 — Specifications / 314
Base Courses (300-399)

314SUPERPAVE ASPHALT MIXTURE DESIGN, STANDARD CONSTRUCTION, ASPHALT RICH BASE COURSE

PA · 2026 Standard SpecificationsBook pages 231–235View official source ↗

344.4(a) 344.4(c)

1.c Calcium Chloride Additive. Gallon.

1.d Magnesium Chloride Additive. Gallon.

(b)Asphalt Tack Coat. Section 460.4.
(c)Asphalt Fog Seal. Section 472.4.

350.1 350.3(d)

350.1DESCRIPTION —This work is preparation of subgrade, as specified in Section 210, and construction

of a compacted aggregate subbase.

350.2MATERIAL —

(a)Aggregates. Unless otherwise indicated or directed , TypeS or better, No. 2A and /or No. OGS, as

specified in Sections 703.2 and 703.5.

350.3CONSTRUCTION —

(a)Equipment.
1.Compaction Equipment. Sections 108.05(c) 3.i or 4
(b)General. For quantities greater tha n 1,500 tons, prepare and submit a Subbase Delivery Plan to the

Representative, if directed. Indicate the construction equipment and methods necessary to deliver and place the subbase in a manner that is not detrimental to the subgrade. Do not begin subbase operations until the Representative reviews the Subbase Delivery Plan. Prepare the subgrade as specified in Section 210 before placing subbase. Correct any deficiencies in the subgrade, as specified in Section 210, before placing the subbase. Do not place subbase material on soft, muddy, or frozen areas. If directed, correct unsatisfactory subbase conditions developing ahead of the base and paving operations by removing the subbase, correcting the subgrade problem, and replacing the subbase.

(c)Mixing. Use acceptable methods to mix materials and water before delivery to the project. Use a

blend of materials from different sources only if allowed. Use material containing enough moisture to prevent segregation during stockpiling, hauling, and placing, and to minimize water added during compaction. Maintain subbase in a well -moistened condition from before placement to compaction.

(d)Placement. Before placing subbase, construct berms to confine the material. Verify the Class 4,

Type A geotextile has been installed as specified in Section 210.3(b). Place the subbase before paving and as indicated . Control the subbase elevation and depth as specified in Section 210.3(c); except do not use templates if the subbase is trimmed using an automatic grading machine. Place the material on the subgrade and geotextile by back dumping then spreading the subbase ahead of all equipment. Spread, in a manner not causing segregation, to a uniform depth of the layer being placed. Do not make abrupt turns with tracked equipment that would result in pulling, folding, or tensioning of the fabric. Do not disturb or damage the geotextile during the installation of the overlying subbase. Repair any damaged geotextile at no additional cost to the Department . For rigid pavement and shoulders, p

Source: Pennsylvania Department of Transportation Specifications, 2026 Edition. Pages 231–235 of 1,522.
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313 SUPERPAVE ASPHALT MIXTURE DESIGN, STANDARD CONSTRUCTION, BASE COURSE
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