SS318-002020-01.docx
DOCX document 35 KB Posted
- Attached to
- Construction, University Drive Bike Lanes
- Solicitation number
- IFB-114424
- Issued by
- Fairfax County, Virginia
About this file
This is a supplemental specifications document issued by the Virginia Department of Transportation (VDOT) on August 2, 2023, establishing guidelines for pavement interlayer installation on road and bridge projects. The document amends Section 318 of VDOT's 2020 Road and Bridge Specifications to provide detailed requirements for the overlapping of adjacent interlayer rolls and bond strength specifications. The specifications address roll selection considerations, overlap placement restrictions, minimum overlap dimensions, and tack coat application requirements to ensure proper interlayer installation across all projects utilizing these materials.
The specifications establish that adjacent interlayer rolls must be overlapped, seamed, or fastened according to manufacturer instructions unless superseded by stated requirements. Key technical requirements include: overlaps must measure a minimum of 2 inches (50 mm); overlaps are prohibited in wheel paths and under construction joints; all longitudinal and transverse overlaps must receive a secondary tack coat between fabric layers; and contractors must ensure adequate bond between existing surfaces, interlayers, and new overlays. Contractors must comply with all requirements unless otherwise approved by the Engineer, with bond strength verification conducted according to Section 310.03(c) standards.
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Text version
Guidelines: Use on all projects.
SS318-002020-01 August 2, 2023
VIRGINIA DEPARTMENT OF TRANSPORTATION
2020 ROAD AND BRIDGE SUPPLEMENTAL SPECIFICATIONS
SECTION 318 – PAVEMENT INTERLAYERS
SECTION 318 – PAVEMENT INTERLAYERS of the Specifications is amended as follows:
Section 318.03(c) – Overlapping of Adjacent Interlayer Rolls is replaced by the following:
Overlapping of Adjacent Interlayer Rolls: Adjacent interlayer rolls shall be overlapped, seamed, or fastened per the manufacturer’s instructions; however, those instructions shall not supersede the requirements below.
1. When selecting roll sizes of interlayer products, and particularly when selecting the roll width, the lane width and any additional width needed for longitudinal overlap shall be considered.
2. When the size of the roll is less than that of the installation, then overlapping of the material will be required and the following will apply:
a. Overlaps are not allowed in the wheel path and/or under the construction joint;
b. Minimum overlaps shall not be less than 2 inches (50 mm), and
c. All longitudinal and transverse overlaps shall receive a second tack coat between the fabric overlaps.
Each of the requirements applies unless otherwise approved by the Engineer.
Section 318.03(e) – Bond Strength is inserted as follows:
Bond Strength: The Contractor shall ensure an adequate bond is made between the existing surface, interlayer, and the new overlay. The referee system for bond strength according to Section 310.03(c) is applicable for pavement interlayer placement.
File details come from the government source that posted it. Updated .