Low Volume Roads Chapter 12: Roadway Materials

Course Synopsis:

This course material derives from a Best Management Practices Field Guide as produced by the USDA, Forest Service. The quiz author is J. Cloyce Darnell, P.E.

Did you know? Road surface stabilization using coarse rock larger than about 7.5 cm should be avoided, because coarse rock is difficult to drive upon or keep stabilized on the road surface, and it damages tires.

Low Volume Roads (LVRs) are normally considered as roads with relatively low use, an Average Daily Traffic (ADT) of less than 400 vehicles per day, design speeds typically less than 50 mph, and corresponding geometry. Most roads in rural areas are Low Volume Roads.

Understanding the engineering principles and practices uniquely applicable to the design, construction, and maintenance of bridges for Low Volume Roads allows the engineer to determine and implement the Best Management Practices described herein. This course provides specific information and engineering criteria regarding Roadway Materials and Material Sources for Low Volume Roads.

Course Objectives:

This course teaches the following specific knowledge and skills regarding Roadway Materials for Low Volume Roads in the following categories:

• Commonly Used Surface Types and Structural Sections

• Improving Structural Capacity

• Aggregate Options to Prevent Rutting

• Soil-Aggregate Mixture Physical States

• Compaction Procedures

• Recommended Practices

• Practices to Avoid

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