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Title:Aggregate Subgrade Improvements Using Quarry By-products: A Field Investigation
Author(s):Qamhia, Issam I. A.; Tutumluer, Erol; Wang, Han
Subject(s):Aggregate Subgrade Improvement
Quarry By-product Aggregates
Field Evaluation
Case Study
Sustainable Construction
Nondestructive Testing
Aggregate Blends
Abstract:This report presents a case study for constructing aggregate subgrade improvement (ASI) layers using quarry by-product aggregates (QBA), a quarry mix of large primary crushed rocks (PCR) and sand-sized quarry fines. The construction took place at Larry Power Road in Bourbonnais Township in Kankakee County, Illinois, where the Illinois Department of Transportation placed two QBA mixes. The first mix (QBA_M1) consisted of 45% quarry by-products and 55% railroad ballast–sized 3×1 PCR. The second mix (QBA_M2) consisted of 31% and 69% quarry by-products and PCR, respectively. Two conventional ASI sections were also constructed conforming to Illinois Department of Transportation’s CS02 gradation. All sections consisted of a 9 in. (229 mm) QBA/PCR layer topped with a 3 in. (76 mm) dense-graded capping layer. Laboratory studies preceded the construction to recommend optimum quarry by-product content in the QBA materials and construction practice. The Illinois Center for Transportation research team monitored the quality and uniformity of the construction using nondestructive testing techniques such as dynamic cone penetrometer, lightweight deflectometer, and falling weight deflectometer. The segregation potential was monitored by visual inspection and imaging-based techniques. Short-term field evaluation of the constructed QBA layers, particularly QBA_M2 with a 31% quarry by-product content, showed no evidence of abnormal segregation and did not jeopardize the structural integrity of the QBA ASI layers, which had slightly lower but comparable strength and stiffness profiles to the conventional ASI sections. The use of QBA materials in ASI was field validated as a sustainable construction practice to provide stable pavement foundation layers.
Issue Date:2021-06
Publisher:Illinois Center for Transportation/Illinois Department of Transportation
Citation Info:Qamhia, Issam I. A., Erol Tutumluer, and Han Wang. 2021. Aggregate Subgrade Improvements Using Quarry By-products: A Field Investigation. A report of the findings of ICT-R27-SP43. Illinois Center for Transportation Series No. 21-017. Research Report No. FHWA-ICT-21-012. Illinois Center for Transportation, Rantoul, IL.
Genre:Technical Report
Rights Information:No restrictions. This document is available through the National Technical Information Service, Springfield, VA 22161.
Date Available in IDEALS:2021-06-07

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