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Title:

Implementation Framework of the UIUC Aggregate Base Rutting Model Using Constrained and Stepwise Regression Statistical Techniques

Accession Number:

01698444

Record Type:

Component

Abstract:

This paper presents findings from a research study focused on calibrating and improving the robustness and implementation of a permanent deformation model for unbound aggregate base/subbase materials, recently developed at the University of Illinois at Urbana-Champaign (UIUC) and referred to as the UIUC rutting model. The developed model provides estimates for permanent strains as a function of number of load cycles, applied wheel load deviator stress, and the ratio of mobilized shear stress to strength. Sixteen aggregate materials from the state of North Carolina (NC) were tested for permanent deformation both at their source gradations, and an engineered mid-range gradation used in NC for base courses. Based on multiple linear regression analyses, the four model parameters were determined to estimate the laboratory measured permanent strains with high accuracy. Two statistical approaches, constrained and stepwise regression techniques, were then employed to reduce the variability in the values of the regression model parameters for different materials, increase the robustness, and express the model parameters as function of material properties such as shear strength, morphological shape properties, gradation properties, and compaction characteristics. Results from stepwise analyses indicated that the most accurate predictions could be achieved by considering particle shape properties. Finally, a framework was established to realistically predict unbound aggregate permanent deformation trends of flexible pavement base and subbase layers using the UIUC model parameter equations provided in this paper from stepwise regression and the physical/mechanical properties of the aggregate materials determined from standard laboratory tests conducted by transportation agencies.

Supplemental Notes:

This paper was sponsored by TRB committee AFD80 Standing Committee on Pavement Structural Modeling and Evaluation.

Report/Paper Numbers:

19-05649

Language:

English

Corporate Authors:

Transportation Research Board

Authors:

Qamhia, Issam I A
Moaveni, Maziar
Byun, Yong-Hoon
Feng, Bin
Tutumluer, Erol

Pagination:

5p

Publication Date:

2019

Conference:

Transportation Research Board 98th Annual Meeting

Location: Washington DC, United States
Date: 2019-1-13 to 2019-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

References

Uncontrolled Terms:

Unbound aggregate base courses

Geographic Terms:

North Carolina

Subject Areas:

Highways; Pavements

Source Data:

Transportation Research Board Annual Meeting 2019 Paper #19-05649

Files:

TRIS, TRB, ATRI

Created Date:

Dec 7 2018 9:23AM