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Title:

Investigation of Testing Variables of Semicircular Bending Test for Asphalt Concrete Mixtures: Experimental-Statistical Approach

Accession Number:

01592577

Record Type:

Component

Abstract:

Given the fact that fracture is a primary distress resulting from pavement failure, it is important to identify and characterize the fracture/cracking properties of asphalt concrete mixtures and to include them in pavement design processes. This paper examines the testing variables of a reliable and practical semicircular bending (SCB) test for evaluating the fracture characteristics of asphalt concrete mixtures at intermediate service temperature conditions. Four testing variables (i.e., specimen thickness, notch length, loading rate, and testing temperature) of the SCB test were selected due to their significant effects on mixture fracture characteristics. Coefficient of variation (COV) of the mixture fracture energy was used to evaluate the repeatability of test results due to the variations of each testing variable. Statistical analyses were then conducted to investigate the minimum number of SCB specimens to be tested for a representative test result with the four test variables determined. A range of 0.1 mm/min. to 5 mm/min. for the loading rate, a notch length from 5 mm to 25 mm, and a SCB specimen thickness of 40 mm to 60 mm were found to result in a relatively low COV (≤10%) of the mixture fracture energy. In the range of testing temperatures attempted in this study, fracture energy at around 15° C showed the lowest testing variation. The statistical analysis of a total of 18 SCB specimens indicated that five to six SCB specimens would be a reasonable sample size that can properly represent the asphalt concrete fracture behavior of the entire population (18 specimens, in this case) with a 95% level of confidence.

Supplemental Notes:

This paper was sponsored by TRB committee AFK50 Standing Committee on Characteristics of Asphalt Paving Mixtures to Meet Structural Requirements. Alternate title: Investigation of Testing Variables of a Semi-Circular Bending (SCB) Test for Asphalt Concrete Mixtures: Experimental-Statistical Approach.

Monograph Accession #:

01584066

Report/Paper Numbers:

16-4540

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Nsengiyumva, Gabriel
You, Taesun
Kim, Yong-Rak
Beran, Matt

Pagination:

19p

Publication Date:

2016

Conference:

Transportation Research Board 95th Annual Meeting

Location: Washington DC, United States
Date: 2016-1-10 to 2016-1-14
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Subject Areas:

Design; Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2016 Paper #16-4540

Files:

TRIS, TRB, ATRI

Created Date:

Jan 12 2016 6:01PM