Evaluation of Rutting Performance of Asphalt Concrete Layers Using Multi-Depth Deflectometers (MDD)

Nakseok Kim 대한토목학회 2004 KSCE journal of civil engineering Vol.8 No.4

Development of a Practical Rutting Characterization Method for Bituminous Mixtures

Kim, Nakseok The Korean Society of Disaster Information 2014 한국재난정보학회 논문집 Vol.10 No.1

The main objective of materials testing is to simulate in-situ field conditions as closely as possible, including loading conditions, climatic conditions, etc. Also, the test method should be easy, inexpensive, simple, and efficient to conduct to become an acceptable standard laboratory testing method for many agencies. Based on these reasons, a new test method employing repetitive axial loading with confinement was developed to evaluate the rutting(permanent deformation) of asphalt concrete. The new laboratory test protocol was developed based on the study of the various structural analysis and field data. This protocol divides asphalt layer(s) into three categories depending upon the depth. Different temperatures and vertical stress levels were used in these areas. 재료시험의 주 목적은 작용되는 하중과 기후조건을 포함하여 현장조건과 가급적으로 유사한 조건하에서 모사하는 것이다. 또한 시험법은 쉽고 저렴하며 시험을 수행하기 간단하며 시험결과가 효율적 이어서 많은 기관에서 표준시험법으로 수용할 수 있어야한다. 본 연구에서는 이러한 내용에 근거하여 새로운 시험법인 구속응력을 가진 반복 축 하중시험이 아스팔트 콘크리트 혼합물의 소성변형 시험으로 개발되었다. 본 연구에서 제시하는 소성변형 시험은 다양한 구조해석과 현장 데이터의 분석을 근거로 개발되었다. 본 아스팔트 콘크리트의 소성변형 시험법에서는 포장의 깊이에 따라 3가지 범주로 분류 하였다. 각 범주마다 다른 온도와 수직응력을 적용하여 시험을 수행하였다.

Multi-Laboratory Validation Study on Resilient Modulus of Asphalt Concrete Using SHRP LG Device

Nakseok Kim 대한토목학회 1999 KSCE journal of civil engineering Vol.3 No.1

Development of Rutting Prediction Model of Flexible Pavement using Repetitive Axial Loading Test

Kim, Nakseok The Korean Society of Disaster Information 2017 한국재난정보학회 논문집 Vol.13 No.4

The primary objective of this research is to develop a rutting performance prediction model of flexible pavement. Extensive laboratory testings were conducted to achieve the objective. A new test method employing repetitive axial loading with confinement was also adopted to estimate the rutting performance of asphalt concrete in the research. The rutting prediction model employes a layer-strain theory. The required rutting coefficients for the prediction model were determined through the laboratory rutting characterizations of the asphalt concrete layer materials. Within the limits of this study, a laboratory rutting prediction model of flexible pavement using repetitive axial loading test was presented. It is noted that the developed rutting prediction model simulates propery the behaviors of flexible pavement layer materials. 본 연구의 주 목적은 연성 도로포장의 소성변형 예측모델을 개발하는 것이다. 목적을 수행하기 위하여 다양한 실험실 시험이 수행되었다. 소성변형 량을 측정하기 위하여 측면 구속압을 제공하는 새로운 반복 일축압축시험이 채택되었으며 소성변형 예측모델은 층별-변형률 이론이 적용되었다. 예측모델의 소성계수는 아스팔트 콘크리트 재료의 소성변형시험을 통하여 결정되었다. 본 연구가 수행된 범위내에서 반복 일축압축시험을 통한 연성포장의 소성변형 예측모델이 제안되었다. 제안된 소성변형 예측모델은 연성포장 층 재료의 거동을 적절하게 모사하는 것으로 나타났다.

반복 축하중 시험을 이용한 연성포장의 소성변형 예측모델 개발

Nakseok Kim 한국재난정보학회 2017 한국재난정보학회 논문집 Vol.13 No.4

본 연구의 주 목적은 연성 도로포장의 소성변형 예측모델을 개발하는 것이다. 목적을 수행 하기 위하여 다양한 실험실 시험이 수행되었다. 소성변형 량을 측정하기 위하여 측면 구속 압을 제공하는 새로운 반복 일축압축시험이 채택되었으며 소성변형 예측모델은 층별-변형 률 이론이 적용되었다. 예측모델의 소성계수는 아스팔트 콘크리트 재료의 소성변형시험을 통하여 결정되었다. 본 연구가 수행된 범위내에서 반복 일축압축시험을 통한 연성포장의 소성변형 예측모델이 제안되었다. 제안된 소성변형 예측모델은 연성포장 층 재료의 거동을 적절하게 모사하는 것으로 나타났다. The primary objective of this research is to develop a rutting performance prediction model of flexible pavement. Extensive laboratory testings were conducted to achieve the objective. A new test method employing repetitive axial loading with confinement was also adopted to estimate the rutting performance of asphalt concrete in the research. The rutting prediction model employes a layer-strain theory. The required rutting coefficients for the prediction model were determined through the laboratory rutting characterizations of the asphalt concrete layer materials. Within the limits of this study, a laboratory rutting prediction model of flexible pavement using repetitive axial loading test was presented. It is noted that the developed rutting prediction model simulates propery the behaviors of flexible pavement layer materials.

Characteristics of hot mix asphalt containing steel slag aggregate according to temperature and void percentage

Kim, Kyungnam,Haeng Jo, Shin,Kim, Nakseok,Kim, Hyunwook Elsevier 2018 Construction and Building Materials Vol.188 No.-

<P><B>Abstract</B></P> <P>This study investigated the behavior of hot mix asphalt mixture containing steel slag aggregate (SHMA). Compared to hot mix asphalt mixture containing granite aggregate (GHMA), SHMA increased strains by approximately 15%; however, a void percentage of 4.2% or higher resulted in a strain similar to that of GHMA. Furthermore, the dynamic modulus of SHMA remained higher than that of GHMA because SHMA exhibited favorable aggregate interlock due to its high strength and grain shape. In addition, when the target air void was increased to 4.5%, SHMA showed improvements in rut resistance, tensile strength, and toughness of 121, 110, and 114%, respectively, compared to GHMA.</P> <P><B>Highlights</B></P> <P> <UL> <LI> SHMA demonstrated higher strains than GHMA except at void fractions >4.5%. </LI> <LI> SHMA showed improvement in rut resistance, tensile strength, and toughness. </LI> <LI> Dynamic modulus of SHMA was higher than that of GHMA for all temperatures. </LI> <LI> SHMA can significantly improve performance when appropriately treated. </LI> </UL> </P>

아스팔트 콘크리트 혼합물의 소성변형시험 개발

Nakseok Kim 한국재난정보학회 2014 한국재난정보학회 논문집 Vol.10 No.1

재료시험의 주 목적은 작용되는 하중과 기후조건을 포함하여 현장조건과 가급적으로 유 사한 조건하에서 모사하는 것이다. 또한 시험법은 쉽고 저렴하며 시험을 수행하기 간단 하며 시험결과가 효율적 이어서 많은 기관에서 표준시험법으로 수용할 수 있어야한다. 본 연구에서는 이러한 내용에 근거하여 새로운 시험법인 구속응력을 가진 반복 축 하중 시험이 아스팔트 콘크리트 혼합물의 소성변형 시험으로 개발되었다. 본 연구에서 제시 하는 소성변형 시험은 다양한 구조해석과 현장 데이터의 분석을 근거로 개발되었다. 본 아스팔트 콘크리트의 소성변형 시험법에서는 포장의 깊이에 따라 3가지 범주로 분류 하 였다. 각 범주마다 다른 온도와 수직응력을 적용하여 시험을 수행하였다. The main objective of materials testing is to simulate in-situ field conditions as closely as possible, including loading conditions, climatic conditions, etc. Also, the test method should be easy, inexpensive, simple, and efficient to conduct to become an acceptable standard laboratory testing method for many agencies. Based on these reasons, a new test method employing repetitive axial loading with confinement was developed to evaluate the rutting(permanent deformation) of asphalt concrete. The new laboratory test protocol was developed based on the study of the various structural analysis and field data. This protocol divides asphalt layer(s) into three categories depending upon the depth. Different temperatures and vertical stress levels were used in these areas.

강상판형교 교면포장 공법 비교 연구

Nakseok Kim 한국재난정보학회 2012 한국재난정보학회 논문집 Vol.8 No.2

A Study on ActivationA Study on Activation Plan for Construction Management(CM) in Korea

Nakseok Kim,Hyosung Park 한국방재학회 2016 Journal of Disaster Management Vol.1 No.1

The more professional and systematic Construction Management(CM) system came into request to achieve business target effectively, as construction industry had grown at the trend of complication, specialization and high-tech dramatically in Korea. In this trend, ‘Responsible construction type CM’ was refreshingly introduced to contract with CM system for general construction works at the time of revision ｢Construction Industry Framework Act｣ in May 24, 2011. Responsibility Supervision(RS) system was converted into ‘Acting director right CM’ system at the time of general revision, from ｢Construction Technology Management Act｣ to ｢Construction Technology Promotion Act｣ in May 14, 2014. In this manuscript the results of the analysis between domestic RS system and advanced country CM system are summarized. It aims to draw up the future-oriented construction policy proposals in order to boost domestic CM system based on the results. The policy proposals for construction are suggested about the expansion plan of CM application target, training plan of CM expert, restructure organization plan of the Ministry of Land, Infrastructure and Transport(MOLIT) etc.

친환경 아스팔트 도로포장의 현장 공용성 분석

Nakseok Kim 한국재난정보학회 2013 한국재난정보학회 논문집 Vol.9 No.1