SS220-002020-01.docx

This document is a 2020 Road and Bridge Supplemental Specifications amendment issued by the Virginia Department of Transportation on August 28, 2020, specifically addressing Section 220 concerning concrete curing materials. The amendment establishes revised specifications for four primary curing material products: waterproof paper, polyethylene (PE) film, a combination of burlap and PE film, and burlap used independently. Each material specification references relevant industry standards, including ASTM C171 for waterproof paper and PE film products, and AASHTO M 182, Class 3 for burlap materials. The waterproof paper requirement specifies that one side must be composed of white, light-reflecting paper, while PE film must maintain a nominal thickness of 3.0 mils with a minimum thickness of 2.5 mils at any point. The combined burlap and PE film product must achieve a total weight of 11 ounces per square yard with 11 threads of burlap per inch and must be securely bonded to prevent separation.

The specifications for standalone burlap products incorporate a quality acceptance standard that allows for a 10 percent variation in individual sample weights, with final acceptance based on the average weight of all submitted samples. The amendment establishes that any individual sample falling outside the 10 percent tolerance threshold will result in rejection of the entire lot, ensuring consistent material quality across all concrete curing applications on Virginia Department of Transportation projects.