Probability of functional failure using deformation strength (SD) of polymer-modified asphalt concretes

Wonbae Kim; Byeong-Ho Lee; Kyong K. Yun; Kwang W. Kim

doi:10.22702/jkai.2026.16.1.5

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2026 Vol.16, Issue 1 Preview Page Next Page

Probability of functional failure using deformation strength (S_D) of polymer-modified asphalt concretes 개질 아스팔트 혼합물의 변형강도를 이용한 기능성 파괴 확률 연구

30 June 2026. pp. 53-64

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Abstract

The deformation strength (S_D) was developed to measure the deformation resistance of the asphalt concrete material at high temperature (60°C). The static pressure is applied through a loading head to create a load-induced spot deformation which is similar to the one created by a static wheel loading. The S_D is one of mix-design criteria for asphalt mixture in Korea. The minimum (critical) values of S_D for surface course of 2^nd class road pavement and of 1^st class highway pavement are 3.2 MPa and 4.25 MPa, respectively, which were set forth by Ministry of Land, Infrastructure and Transport, Republic of Korea. In this study, a total of 30 random field samples of polymer-modified asphalt (PMA: PG76-22) mixtures for dense-graded surface course were collected from nation-wide field sites. Three specimens with 100 mm in diameter were prepared using a gyratory compactor to measure S_D for each site mix. The statistical data analysis was performed to estimate population mean (μ) and standard deviation (σ). Statistical data show that the S_D mean of 4.93 MPa satisfied the mix-design criterion of 4.25 MPa. The coefficient of variation (V_c) of modified mixes was 9.31%, which is known to be lower level than that of normal mixes. The chi-square goodness of fit test was performed to determine how well the sample data distribution fits to normal distribution theoretically. As a result, the S_D data were found to be fit to the normal distribution at α = 0.05. The process means (SD) for each functional failure (inducing rutting) level was suggested for field strength quality control. The suggested process means for PG76-22 mixtures were 4.83, 5.0 and 5.43 MPa for the probability of functional failure (Pf) of 0.1, 0.05 and 0.01, respectively. In stead of using mix-design criterion S_D value (4.25 MPa), if those values of SD are applied to the field mix quality control, the rutting cause will be significantly reduced on the pavement.

Keywords

Polymer-modified asphalt, Deformation strength (S_D)

Process mean

Standard deviation

Coefficient of variation

Field mixture

Quality control

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Information

Publisher :KOREAN ASPHALT INSTITUTE
Publisher(Ko) :한국아스팔트학회
Journal Title :Journal of the Korean Asphalt Institute
Journal Title(Ko) :한국아스팔트학회지
Volume : 16
No :1
Pages :53-64
Received Date : 2026-06-05
Revised Date : 2026-06-19
Accepted Date : 2026-06-24
DOI :https://doi.org/10.22702/jkai.2026.16.1.5

Journal of the Korean Asphalt Institute ISSN:2234-0785(Print) 2635-9553(Online) 한국아스팔트학회지

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