211— Proof Rolling

211.1 Description

1 Furnish and operate, at the direction of the RCE, heavy, pneumatic -tire equipment for testing the roadway embankment and subgrade for stability and uniformity of compaction.

211.2 Materials

1 None specified.

211.3 Construction

211.3.1 Equipment

1 Use equipment for proof rolling that inc ludes a fully loaded tandem axle dump truck or an equivalent accepted by the RCE. Use only equipment with air -filled pneumatic tires. Ensure that the tires have a pressure between 70 and 90 psi while proof rolling . Use equipment with tires mounted on articulated axles so that all wheels on the same axle carry approximately equal loads when operated over uneven surfaces.

211.3.2 Operation

1 Proof roll each lift of embankment and subgrade that has an elevation of 5 ft or less below the finished subgrade elevation before placement of subsequent lifts, or as directed by the RCE. Perform proof rolling in t he presence of the RCE or the RCE’s certified earthwork, drainage, and base inspector. Operate proof rolling equi pment at a speed between 200 and 300 ft per minute. Make a minimum of five passes over each area proof rolled. Correct areas that are unstable or non- uniform. After correction of these deficient areas, repeat the proof rolling operation.

211.4 Measurement

1 No specific measurement is made for the work involved in proof rolli ng.

211.5 Payment

1 This work includes furnishing all labor, equipment, fuel, and ballast for loading; loading and unloading ballast as directed; and increasing and decreasing tire pressure as directed. This work is considered incidental to embankment and subgrade compaction and no direct payment is made for this work.