00469173

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http://onlinepubs.trb.org...trr/1987/1128/1128-005.pdf

https://scholar.google.co...icks&publication_year=1987

Load restrictions to reduce or preclude pavement damage during spring thaw periods are widely used in the United States and Europe. Load restrictions are primarily applied to low-volume road networks. In recent years extensive examinations of load restriction-related issues have been conducted in states such as Alaska, Minnesota, and Washington. The development of guidelines for use in determining where to apply the load restrictions and their magnitude is reported in this paper. A survey of current practice in the United States and Canada revealed that load restrictions are applied mostly to pavements that have subgrades composed of moisture-susceptible silts and clays. It also revealed that the restrictions are mostly applied to aggregate and asphalt-surfaced pavements. The maximum legal loads are generally reduced about 40 to 50 percent for single axles and 30 to 50 percent for tandem axles during the spring thaw period. The current study recommends that load restrictions be applied whenever a pavement's spring surface deflections are greater than 45 to 50 percent of summer deflections. The extent of load restrictions suggested is a minimum of 20 percent and a maximum of 60 percent. A load reduction range of 40 to 50 percent should accommodate a wide range of pavement conditions.

Publication of this paper sponsored by Committee on Low-Volume Roads. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01418142

pp 42-52

1987

Transportation Research Record

0309045053

Print

Figures (5) ; References (15) ; Tables (9)

Clay; Deflection; Guidelines; Load limits; Low volume roads; Pavements; Silts; Subgrade (Pavements); Thaw

Spring breakup

Administration and Management; Design; Highways; Pavements; I10: Economics and Administration; I22: Design of Pavements, Railways and Guideways

TRIS, TRB, ATRI

Jun 30 1988 12:00AM

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