Campus Units

Civil, Construction and Environmental Engineering

Document Type

Conference Proceeding


International Foundations Congress and Equipment Expo 2021

Publication Version

Accepted Manuscript

Link to Published Version

Publication Date


First Page


Last Page


Research Focus Area

Transportation Engineering, Geotechnical/Materials Engineering



Conference Title

International Foundations Congress and Equipment Expo 2021

Conference Date

May 10–14, 2021


Dallas, TX


Granular-surfaced roads comprise 73% of Iowa’s county road network. The surfaces of these gravel roads undergo mechanical and chemical deterioration over time due to extreme weather conditions and traffic loads. The goal of the present study is to improve our understanding of the mechanical deterioration that affects the performance of different geological types of coarse aggregates used in granular roads and shoulders. Samples of coarse aggregates were collected from four different quarries in Iowa. Laboratory gyratory compaction tests (GCT) were performed on specimens of the quarry samples to simulate their degradation under traffic loading conditions over time. From the results of GCTs, breakage parameters are evaluated, and relationships between dry unit weight, shear strength, and compaction energy are established for the different aggregate types examined. From these relationships, an efficient field-compaction energy criterion is determined to maximize density and shear strength while minimizing over-compaction and breakage of the aggregates.


This is a manuscript of a proceeding published as Lamba, Kanika H., Jeramy C. Ashlock, Bora Cetin, and Franciszek Hasiuk. "Evaluation of Mechanical Degradation and Change in Geotechnical Shear Resistance Parameters of Coarse Aggregates under Traffic Loading." In IFCEE 2021, pp. 349-360. This material may be found at DOI: 10.1061/9780784483435.034. Posted with permission.


This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers.

Copyright Owner

American Society of Civil Engineers



File Format


Published Version


Article Location