알갱이 형태의 유색첨가제를 이용한 칼라 아스팔트 혼합물의 공용성 평가 연구

이상염,안용주,문성호,김영민 한국도로학회 2011 한국도로학회논문집 Vol.13 No.4

Asphalt concrete pavement can be widely seen on urban streets, highways, parking lots, and bike trails. Asphalt concrete pavement is relatively temperature sensitive materials due to the viscoelastic behavior, which can be defined as flexible performance in summer and rigid performance in winter. In terms of maintenance, it can be fixed quite easily if damaged. In addition, asphalt concrete pavement is generally found to be black and grey in color. However, several colors can be adopted to change the appearance of plain old boring, black and grey. Generally, there are two types of color systems in hot mix asphalt concrete materials. One system uses colored cementitious material that is applied to pavement surface through coating the surface of the asphalt pavement. The major disadvantage to this system requires a careful skill set to be used on the construction site in order to prevent taking off the cementitious material. The other coloring system colors the asphalt hot mixtures through using color additives. The main advantage to this system is that the asphalt pavement layer is colored using the same techniques that are already used in paving. The disadvantage is that the colors are limited to mainly reds and browns. In this study, a suggested color additive was evaluated, based on rutting, moisture sensitivity, and fatigue cracking performance. 아스팔트 콘크리트 포장은 많은 곳에서 쓰여지는 것을 볼 수 있다. 도심지 도로, 고속도로, 주차장, 그리고 자전거 도로에 이용되고 있다. 사용재료의 성질을 보면 비교적 온도에 민감한 재료로 분류될 수 있다. 여름철에는 유연한 성질을 보여주고 있고겨울철에는 강성의 성질을 보여주고 있다. 포장관리의 측면에서는 손상된 부분에 대해서는 비교적 쉽게 보수할 수 있는 점을들 수 있다. 그리고 일반적인 아스팔트 포장의 색깔은 검정과 회색으로 구성되어 있음을 알 수 있는데 이들 아스팔트 포장은다양한 칼라로 표현할 수 있는데 크게 두 가지의 방법으로 칼라포장을 시공할 수 있다. 첫 번째로 시멘트 형태의 칼라도료를아스팔트 포장에 칠하는 방법으로 도료가 벗겨지는 것을 방지하기 위해서는 주위를 요하는 시공이 요구된다. 두 번째의 방법은 칼라 첨가제를 이용한 칼라 아스팔트 시공을 들 수 있다. 본 방법은 원하는 아스팔트 층에 대해 전체적으로 색을 입히는 방법으로 장점으로는 일반적으로 쓰고 있는 혼합물 배합설계를 이용할 수 있다는 점이다. 단점으로는 주로 빨간색 그리고 갈색으로만 색깔을 표현할 수 있는 것이다. 본 연구에서는 제시된 첨가제를 이용하여 영구변형, 수분민감도 및 피로균열에 대한 공용성을 평가하고자 한다.

하모니 검색 알고리즘을 이용한 피로균열의 포장설계 및 유지보수 시기 결정

이상염,문성호 한국도로학회 2014 한국도로학회논문집 Vol.16 No.6

PURPOSES : This research describes how to predict the life cycles of fatigue cracking based on NCHRP Report 704 as well as modifiedharmony search (MHS) algorithm. METHODS : The fatigue cracking regression model of NCHRP Report 704 was used in order to calculate the ESAL (Equivalent SingleAxle Load) numbers up to pavement failure, based on using material parameters, composite modulus, and surface pavement thickness. Furthermore, the MHS algorithm was implemented to find appropriate material parameters and other structural conditions given the number ofESALs, which is related to pavement service life. RESULTS: The case studies show that the material and structural parameters can be obtained, resulting in satisfying the failure endurance ofasphalt concrete structure, given the number of ESALs. For example, the required ESALs such as one or two millions are targeted to satisfy theservice performance of asphalt concrete pavements in this study. CONCLUSIONS : According to the case studies, It can be concluded that the MHS algorithm provides a good tool of optimizationproblems in terms of minimizing the difference between the required service cycles, which is a given value, and the calculated service cycles,which is obtained from the fatigue cracking regression model.

SBR Latex를 이용한 흙 포장의 재료특성 연구

이상염,황성도,양성린 한국도로학회 2014 한국도로학회논문집 Vol.16 No.5

PURPOSES : The purpose of this study is to determine the optimum addition rate of SBR latex through the evaluation of durability andstrength of SBR latex applied soil pavement. Formerly used materials such as fly ash and cement in soil pavement had resulted in decreaseddurability due to micro crack by heat of hydration and shrinkage crack in winter. However, that agglutinated polymers help adhesion toaggregate increased comes up with preventing the crack opening when the number of capillary tubes of SBR latex get decreased in thehydration process of cement. Therefore, in this study, it is suggested that the evaluation of the field applicability of soil pavement be conductedthrough the performance lab test in terms of strength increment, adhesion improvement, and crack resistance based on SBR latex addition rate. METHODS: In order to evaluate the field applicability of soil pavement, SBR latex was added 0 to 3% by 1% increment, with fixed cementcontents of 3% and 5%. The resistance of shear failure and crack of soil pavement were evaluated by performing the uniaxial compressivestrength test and indirect tensile strength test at -20 and 20℃, respectively. RESULTSCONCLUSIONS: It was found out that from both tests, resistance of shear failure and crack were improved with increment ofcuring time, and especially more than 2% of SBR latex addition rate and 5% cement content gave better results.

화력발전소 고장이력을 기반으로 한 터빈 위험도 평가 시스템 개발

이상염,박현구,김영주,박상호 대한기계학회 2019 大韓機械學會論文集B Vol.43 No.2

It is necessary to select suitable plant facilities for overseas power generation projects. Among them, turbines are required to be verified and evaluated during the initial construction. There are specifications, performance, and cost of the turbine that can be evaluated, but there is a need for a method of verifying in terms of risk. In this paper, we developed a model that can show the risk of turbine based on the power plant failure history data, and developed software that can compare and analyze the risk results using it. The developed software can be performed in a short time compared to the quantitative risk assessment, and has the advantage of providing intuitive results. It will provide useful information to engineers who need to determine maintenance cycles as well as overseas power generation users who select turbines. 해외발전사업 수주를 위해 적합한 화력발전소 설비의 선별이 필요하고, 그 중 대표적인 설비인 터빈은 초기 건설시 검증 및 평가가 필수적이다. 터빈의 평가할 수 있는 방법들로 사양, 성능, 비용 등이 있지만, 위험도 측면으로 검증하는 방법이 필요하다. 본 논문에서는 발전소 고장이력자료에 기반하여 터빈의 위험도를 나타낼 수 있는 모델을 개발하고, 이를 사용하여 위험도 결과를 비교/분석할 수 있는 소프트웨어를 개발하였다. 개발된 소프트웨어는 정량적 위험도 평가에 비해 단기간에 수행이 가능하며, 직관적인 결과를 제시하는 장점이 있다. 터빈을 선별하는 해외발전사업 사용자뿐만 아니라 정비 주기를 결정해야 하는 엔지니어에게 유용한 정보를 제공할 것이다.

지표투과레이더 취득신호 분석을 통한 도로하부 이상구간 탐지기법 연구

이상염 한국방재안전학회 2016 한국방재안전학회 학술대회 논문집 Vol.2016 No.-

도로포장 하부 공동 존재여부를 파악하기 위해 하부상태 정보를 획득할 수 있는 지표투과레이더(Ground Penetrating Radar, GPR)가 비파괴시험으로 각광을 받고 있으나 경험에 근거한 정성적 분석으로 인해 정확도는 높지 않다. 정확한 분석 정보와 정량적 해석을 통한 분석기술이 요구된다. 따라서 본 연구에서는 시험구간 (Test bed)에서 GPR 조사로부터 취득한 결과를 분석하여 이상구간을 선정할 수 있었으며, 분석을 위해 심도별 신호의 형상을 중첩시키는 방법과 신호주기에 의한 면적값을 비교하는 방법을 사용하였다 For finding sinkholes, it would be essential to understand cavities under the pavement. GPR is useful to acquire condition information under the pavement because GPR is non-destructive test. However, the accuracy of the test is not high enough. This is owing to the analysis depended on monotonous experiences. It needs improved analysis method with precise assessment and quantitative interpretation. Consequently, this study concentrates on developing several analysis methods by using test bed. To be specific, the obtained signals in test bed are overlapped or piled up for checking abnormal section.

자치구 포장상태평가등급 기준 개선 및 포장상태 예측지수 개발

이상염,전진호 한국도로학회 2016 한국도로학회논문집 Vol.18 No.6

OBJECTIVES : This study develops an evaluation method, which is useful to inspect pavement condition of specific boroughs. This is because pavement condition is broadly divided into five grades via visual inspection, which does not consider the types of deteriorations, and is decided by an investigator having a subjective viewpoint. This visual inspection method is not a satisfactory method for accurate maintenance when various deteriorations occur. METHODS: The performance model considers several factors such as crack, rutting, and IRI. This method is also modified from borough SPI based on SPI (Seoul Pavement Index). Considering limited budget of borough, PI (prediction index) is suggested, which is related to the grade of pavement condition evaluation and type of materials. Practical correlation review is also conducted with statistical verification by using the Monte Carlo simulation. RESULTS: The results of the study show that modified criteria are reasonable. First, the comparison between the visual inspection result and the SPI result indicates that the R-square value is sufficiently high. Second, through the common section, each evaluation method could be compared, and the result shows considerable similarity, which increases when the range is modified. Finally, PI for predicting remaining life and the random number SPI have common parts, which means that each indicator would be adequate to be used as an evaluation method. CONCLUSIONS : Comparison and analysis results show that the developed evaluation method is reasonable for specific boroughs where financial support is inadequate for the evaluation process by using the newer equipment. Moreover, for more accurate evaluation method, previous visual inspection data should be utilized, and the database of inspection equipment have to be collected.

슬러지 투입 및 휠트랙킹 시험을 이용한 블록 포장의 기능적 투수평가

이상염,정훈희,문성호,박대근,박경민 한국도로학회 2011 한국도로학회논문집 Vol.13 No.3

주된 도시들의 불투수성 포장화에 따른 현상으로 토양의 사막화를 일으키고 있으며, 나아가, 도시 온난화 현상을 발생시켜도시지역의 평균 온도를 올리는 원인이 되고 있다. 이로 인해 우수가 투수성 토양에 흡수되거나 잔류되어야 하는 양이 줄어듦에 따라 자주 도심지내에서 범람이 되는 현상을 보여주고 있다. 결국은 우수시스템이 제대로 작동하지 않고 침식이 발생하고있다. 투수성 포장시스템과 관련해서는 블록 포장이 여러 군데서 수년 동안 사용되어 왔다. 또한 투수성 블록 포장은 전통적으로 사용된 아스팔트 포장 및 콘크리트 포장에 비해 다양한 형태로 사용될 수 있는 장점과 더불어 타 포장보다 미적으로 낳은면을 보여 주고 있다. 따라서 도로의 현장 조건을 모사하기 위해 본 연구에서는 실험용 슬러지 및 휠 트래킹 장비를 이용한 블록 포장의 기능적인 투수성 평가를 실시하였다. As the percentage of permeable ground is reduced due to the increased impermeable roads of major cities, a heat island phenomenon can be dominantly observed, resulting in increased temperature. In addition, rainfall that would have been naturally absorbed and retained by the permeable ground is overflowed due to large volumes of run-off water, resulting in more sewer failures and increased erosion. In terms of permeable pavement system, block paving has been used anywhere as well as provides many years of service. The permeable block paving is an effective alternative to the more traditional asphalt or plain concrete for minor roads; furthermore, it looks a lot better than other pavements. In this study, the functional drainage evaluation of block paving was carried out, considering the usage of experimental sludge and wheel tracking test, in order to simulate the field condition of roads.

서울시 내부순환도로 교면포장 형식에 따른 소음특성 연구

이상염,진정훈,문성호,문학룡 한국도로학회 2012 한국도로학회논문집 Vol.14 No.2

타이어와 포장노면과의 마찰음을 측정하기 위해서 기존 연구를 통해 신뢰성 및 일관성이 검증된 NCPX(Noble Close Proximity) 방법을 이용하여 다양한 교면포장형식에 대해 소음측정을 실시하였다. 또한 이번에 실시한 측정은 표면 마이크로폰을 이용하였다. 서울시 내부순환도로의 교면포장 일부 구간을 대상으로 포장형식에 따라서 소음측정을 하였으며, 4개의 교면포장형식에 대한 소음특성을 평가하는데 적절한 실험법임을 알 수 있었다. 시험결과 소음관점에서 차이가 있음을 확인할 수 있었다. 본 측정을 통해 교면포장 표면조건 및 주행속도에 따라 타이어와 포장노면과의 마찰음이 다르게 나타남을 알 수 있었다. 그리고 1/3 옥타브 밴드 해석을 실시한 결과에 있어 교면포장의 종류에 따라 시공전후로 소음특성이 다른 것을 알 수 있었다. A measuring technique for tire-pavement interaction noise that uses a proposed noble close proximity(NCPX) method, which has been proofed in terms of the reliability and consistency of interaction noise measurement through several researches, equipped with surface microphones has been adopted in order to perform bridge deck pavement noise evaluations on four different pavement surfaces. Through field testing measurement of bridge deck pavement in Seoul inner ring road, the appropriate noise-measuring procedures have been used for evaluating the noise characteristics of four different surfaces. Measuring results show that tire-pavement noise levels vary depending on the surface types and vehicle speeds. Furthermore, the different characteristics of tire-pavement interaction noise can be found before and after the new surface construction of bridge deck pavements in terms of the 1/3 octave band analysis of vehicle speed.

실내 및 포장가속시험을 이용한 아스팔트 혼합물의 소성변형 모형 개발

이상염,이현종,허재원,박희문 한국도로학회 2008 한국도로학회논문집 Vol.10 No.4

The pavement performance model is the most important factor to determine the pavement life in the mechanistic-empirical pavement design guide (MEPDG). As part of Korean Pavement Research Program (KPRP), the Korean Pavement Design Guide (KPDG) is currently being developed based on mechanistic-empirical principle. In this paper, the rutting prediction model of asphalt mixtures, one of the pavement performance model, has been developed using triaxial repeated loading testing data. This test was conducted on various types of asphalt mixtures for investigating the rutting characteristics by varying with the temperature and air void. The calibration process was made for the coefficients of rutting prediction model using the accelerated pavement testing data. The accuracy of prediction model can be increased when by considering the effect of individual rutting properties of materials rather than shear stresses with depths. The pavement performance model is the most important factor to determine the pavement life in the mechanistic-empirical pavement design guide (MEPDG). As part of Korean Pavement Research Program (KPRP), the Korean Pavement Design Guide (KPDG) is currently being developed based on mechanistic-empirical principle. In this paper, the rutting prediction model of asphalt mixtures, one of the pavement performance model, has been developed using triaxial repeated loading testing data. This test was conducted on various types of asphalt mixtures for investigating the rutting characteristics by varying with the temperature and air void. The calibration process was made for the coefficients of rutting prediction model using the accelerated pavement testing data. The accuracy of prediction model can be increased when by considering the effect of individual rutting properties of materials rather than shear stresses with depths.

실내 및 포장가속시험를 이용한 아스팔트 혼합물의 소성변형 모형 개발

이상염,이현종,허재원,박희문,Lee, Sang-Yum,Lee, Hyun-Jong,Huh, Jae-Won,Park, Hee-Mun 한국도로학회 2008 한국도로학회논문집 Vol.10 No.4

The pavement performance model is the most important factor to determine the pavement life in the mechanistic-empirical pavement design guide (MEPDG). As part of Korean Pavement Research Program (KPRP), the Korean Pavement Design Guide (KPDG) is currently being developed based on mechanistic-empirical principle. In this paper, the rutting prediction model of asphalt mixtures, one of the pavement performance model, has been developed using triaxial repeated loading testing data. This test was conducted on various types of asphalt mixtures for investigating the rutting characteristics by varying with the temperature and air void. The calibration process was made for the coefficients of rutting prediction model using the accelerated pavement testing data. The accuracy of prediction model can be increased when by considering the effect of individual rutting properties of materials rather than shear stresses with depths. 포장 공용성 모델은 역학적-경험적 포장설계법에서 포장의 수명을 결정하기 위한 가장 중요한 인자이다. 한국 포장연구 프로그램의 일환으로 한국형 포장설계법이 역학적-경험적 방법에 근거하여 현재 개발중에 있다. 본 연구에서는 포장 공용성모델중 아스팔트 혼합물의 영구변형 예측모델을 삼축압축 반복재하시험을 이용하여 개발하였다. 본 시험은 다양한 아스팔트 혼합물에 대하여 온도와 공극률을 변화시켜 하중재하 횟수에 따른 혼합물의 영구변형 특성을 조사하였으며, 본 시험결과를 이용하여 예측모델의 계수값을 결정하였다. 영구변형 예측모델의 계수값은 포장가속시험결과를 토대로 다양한 혼합물에 대한 시험결과를 이용하여 깊이에 따른 전단응력의 변화를 고려한 통합적인 소성변형 모델계수값을 정하는 것보다 혼합물의 종류에 따른 모델계수를 산정하는 것이 보다 정확한 결과를 예측할 것으로 판단된다.