Understanding background of development and principle of deformation strength (SD)

Kwang W. Kim; Sungjin Lee; Wonbae Kim

doi:10.22702/jkai.2026.16.1.2

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2026 Vol.16, Issue 1 Preview Page Next Page

Understanding background of development and principle of deformation strength (S_D) 변형강도의 개발 배경과 원리의 이해

30 June 2026. pp. 11-25

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Abstract

This technical note was written to explain the theoretical background in developing deformation strength (S_D) and principle of the equation for determining S_D from Kim Test result. The Kim Test was developed to measure the vertical deformation (y) of asphalt concrete specimen at the peak load (P) applied by a static loading (30 mm/min) to the center of specimen heated at 60°C. The S_D is the strength against deformation of the semi-plastic materials when they are failed with an apparent deformation. The main idea is to adopt y as a variable for computing S_D, in addition to the failure load (P). Since the S_D is calculated using two variables (y and P), the y is key variable for determining S_D when Ps are identical, and it is possible to distinguish the strong material against deformation. Therefore, the originality of this invention is that, a static loading is applied locally at the top center of specimen and the S_D is obtained as a function of y and P. For the case of the same P, the higher S_D is obtained from the material with smaller y, unlikely to the elastic material testing, which dose not take into account for the magnitude of deformation. Since S_D was found to have high correlation with rut parameters, it was adopted as a mix-design criterion of Korea Ministry of Land, Infrastructure and Transport (MOLIT). However, to apply S_D more widely in asphalt pavement industry, the background and principle of S_D should be more publicized to engineers.

Keywords

Asphalt mixture

Rutting

Deformation strength

S_D

Vertical deformation

High temperature

References

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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 :11-25
Received Date : 2026-05-29
Revised Date : 2026-06-11
Accepted Date : 2026-06-16
DOI :https://doi.org/10.22702/jkai.2026.16.1.2

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

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