01732667

Component

http://www.trb.org/Publications/Blurbs/179567.aspx

Gravel is the most common surfacing material for unpaved roads and the most common material for stabilizing unpaved roads. However, suitable gravel is often unavailable or expensive in some areas because of a lack of natural gravel deposits or for other reasons. In such cases, alternate road stabilization materials are needed. Boiler ash from energy generation at pulp and paper mills is a wood-based industrial byproduct that is common in forested regions that often have thriving timber and paper industries. Beneficial re-use of industrial byproducts including boiler ash, is environmentally desirable. Benefits of using pulp and paper mill boiler ash for road stabilization include reduced gravel mining and hauling and reduced solid waste going to landfills. A demonstration project used various applications of paper mill boiler ash to stabilize two low-volume roads with different soil types. The road subgrade properties were tested in-place and in the lab before and after road stabilization. This paper presents the construction procedures, test results, information on the performance of the two treated roads, the environmental concerns, and a comparison of costs with similar gravel surfacing road projects. Pulp and paper mill boiler ash appears to be effective for road stabilization especially in very sandy soils, and may be cost-competitive with other stabilization techniques in many situations.

01730920

English

pp 358-371

2019-9

Transportation Research Circular

12th International Conference on Low-Volume Roads

Digital/other

Figures; References; Tables

Cost effectiveness; Demonstration projects; Earth roads; Fly ash; Low volume roads; Sandy soils; Soil stabilization; Unpaved roads

Highways; Materials; Pavements

TRIS, TRB, ATRI

Mar 3 2020 9:19AM