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Title:

Conceptual Development of Nomograph to Estimate Modulus with Progressive Fatigue: An Inclusive Application of Dynamic Semicircular Bending Test

Accession Number:

01660203

Record Type:

Component

Abstract:

The objective of this research study was to estimate the degradation of asphalt materials properties measured by modulus based on the continuous fatigue process with the help of fracture characteristics. A total of eighteen asphalt mixtures were prepared, and dynamic semi-circular bending (SCB) test was conducted at three test temperatures. A series of parameters were determined and evaluated to understand the fracture properties of various asphalt mixtures using linear elastic fracture mechanics (LEFM) principles. In addition, the initial moduli of all the mixtures were characterized using |E*| dynamic modulus test, and fracture properties obtained from dynamic SCB test were employed to estimate the reduction coefficient (δ sub SCB) with respect to the initial modulus. The study framework offered the flexibility to change the input variables during the calculation procedure of δ sub SCB. Further, a nomograph was developed using graphical relationship amongst the fracture properties to estimate δ sub SCB for quick approximation purposes. Overall, this study established the correlation between reduction in the modulus and fracture properties, and further developed the conceptual outline to formulate a nomograph that could conveniently estimate the residual modulus of asphalt mixtures with respect to specified lengths of crack growths. It is envisioned that the procedure developed in this study would be useful for comprehensive evaluation of fatigue cracking of asphalt mixtures, and can potentially serve as a helpful tool to estimate/forecast residual life of different asphalt pavements.

Supplemental Notes:

This paper was sponsored by TRB committee AFK50 Standing Committee on Structural Requirements of Asphalt Mixtures. Alternate title: Conceptual Development of Nomograph to Estimate Modulus with Progressive Fatigue: An Inclusive Application of Dynamic Semi-circular Bending Test.

Report/Paper Numbers:

18-03821

Language:

English

Authors:

Saha, Gourab
Biligiri, Krishna Prapoorna

Pagination:

16p

Publication Date:

2018

Conference:

Transportation Research Board 97th Annual Meeting

Location: Washington DC, United States
Date: 2018-1-7 to 2018-1-11
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2018 Paper #18-03821

Files:

TRIS, TRB, ATRI

Created Date:

Jan 8 2018 10:57AM