• Scientific Paper

    Viscosity evaluation of asphalt binders containing petroleum resin
    Navid Hemmati, Hyunhwan Kim, Mithil Mazumder, Soon-Jae Lee and Kyu Dong Jeong
    This study presents an experimental evaluation of viscosity changes in asphalt binders containing petroleum resin. Petroleum resin (PE) as one of the ... + READ MORE
    This study presents an experimental evaluation of viscosity changes in asphalt binders containing petroleum resin. Petroleum resin (PE) as one of the tackifier polymers has been considered to conduct this viscosity measurement in asphalt binders. PG 64-22 and PG 76-22 asphalt binders were modified using three PE contents of 0%, 5% and 10%. The viscosity values of asphalt binders were measured at five testing temperatures of 120°C, 135°C, 150°C, 165°C and 180°C. The test results suggested that (1) at lower temperatures of 120°C and 135°C, the PE resulted in increasing the viscosity of asphalt binders, (2) at higher temperatures of 150°C, 165°C and 180°C, the PE addition seemed to show little effect on the viscosity behavior of binders, and (3) at relatively high temperature, the binder viscosity was so low that it was difficult to statistically verify the effect of PE. - COLLAPSE
    June 2021
  • Scientific Paper

    A study on aging characteristics of blowed warm mix asphalt bindera research on the application status and considerations of warm mix asphalt

    발포 중온아스팔트 바인더의 산화특성 연구

    Sang Gab Cho and Tae Soon Park

    조상갑, 박태순

    Blowing agent is a material that has been applied for a long time in household goods such as plastics, rubber, paper, leather ... + READ MORE
    Blowing agent is a material that has been applied for a long time in household goods such as plastics, rubber, paper, leather, etc. in various industrial fields. Attempts to apply it to asphalt began in Japan in the early 1990s, and began to be used in some areas in Hokkaido from the mid-1990s. Warm Mix Asphalt using a blowing agent is evaluated as a Warm Mix Asphalt method because it can reduce carbon dioxide and reduce production and compaction temperatures to a greater extent compared to the existing Warm Mix Asphalt method. Considering this point, it is necessary to conduct a study on the applicability of the Warm Mix Asphalt using the blowing agent in Korea by applying the advantages of the blowing agent to asphalt. This study was a basic study on the possibility of developing Warm Mix Asphalt using a blowing agent, and it was examined by conducting an indoor test by mixing it with an asphalt binder and a mixture using an industrial blowing agent currently produced in Korea. This paper provides an extensive literature review especially on Warm Mix Asphalt (WMA) technology. A wide considerations of construction example, current issues and future research topics on WMA were performed. It is well known that WMA is an environment friendly, next generation asphalt pavement technology. However, due to lack of long-term performance evaluation and corresponding results, more prudent consideration on applying WMA on asphalt pavement field is needed. In addition, more extensive studies on gas ventilation system development, evaluation during WMA production and optimized additives development with application process are crucially recommended. Based on this paper, readers can understand advantages, disadvantages and challenges on WMA well in many specialized areas. - COLLAPSE
    June 2021
  • Scientific Paper

    Comparative analysis of porous pavement mixtures through production inspection and accredited test results

    배수성 아스팔트 포장의 생산점검을 통한 혼합물 비교분석

    Junseong Choi, Jaesoon Choi and Tae Soon Park

    최준성, 최재순, 박태순

    It is necessary to check the current level of technology whether the mixture of Porous pavement, which has recently been highlighted for ... + READ MORE
    It is necessary to check the current level of technology whether the mixture of Porous pavement, which has recently been highlighted for the improvement of quality of life and reinforcement of LID design, exhibits appropriate performance satisfying Porous guidelines through the optimal production process. In this study, binders and mixtures were collected from production sites at the same time the production process of Porous mixtures was checked. and blind tests were conducted through an authorized testing institution. As a result of analyzing the test results, it was found that the know-how in the production process is needed to improve the storage stability of the Porous pavement binder and to properly manifest the properties of the PG grade and unification of dual standards and development of standards related to performance. In addition, it was found that performance improvement and stabilization of the Tensile Strength Ratio and Dynamic Stability were necessary for the Porous pavement mixture. - COLLAPSE
    June 2021
  • Scientific Paper

    Comparison of specimen height measurement methods for correction on marshall stability

    마샬 안정도 보정을 위한 높이측정 방법 비교분석

    Jun Seong Choi and Hyeon Ho Jin

    최준성, 진현호

    There are guidelines for measuring the height of the specimen when proceeding the Marshall Stability Test in Korea, and most of the ... + READ MORE
    There are guidelines for measuring the height of the specimen when proceeding the Marshall Stability Test in Korea, and most of the tests are conducted in accordance with this regulation. However, those regulations are not followed well on the site due to their specificity. In this study, Marshall specimen height measurement method is proposed for overcoming plaguesomeness in the lab. Based on existing regulations and guidelines through literature analysis and experiments, 2 point measurement is proposed comparing with 4 point measurement. - COLLAPSE
    June 2021
  • Scientific Paper

    A study on the characteristics of epoxy asphalt bridge pavement constructed on steel top plate of suspension bridge in Korea

    국내 현수교량의 강상판에 시공된 에폭시 아스팔트 교면 포장의 특성 연구

    Jung Hoon Jin and Youngdoo Jang

    진정훈, 장영두

    Epoxy asphalt concrete bridge pavement applied to steel deck suspension bridges in Korea has been constructed since it was first introduced in ... + READ MORE
    Epoxy asphalt concrete bridge pavement applied to steel deck suspension bridges in Korea has been constructed since it was first introduced in 2013, with three using U.S.-made binders and one using Chinese-made binders. Although domestic steel structure engineers were worried about durability due to the 5 cm thickness of the bridge pavement, it was spot-lighted as an economic method in terms of reducing the dead load of the structure. Epoxy asphalt concrete bridge pavement, which was constructed for the first time in Korea, is made in China. Five months after the completion of the bridge, serious paving damage occurred, and the entire bridge was removed, and the bridge was re-constructed as a Chinese products in 2014. However, it was damaged again, so we have been re-paving it after cutting it with other paving materials since 2018. The American epoxy asphalt concrete bridge pavement was paved with suspension bridges in 2015 and re-paved with other paving materials in 2019 due to aggregate detaching after four years in service. Two suspension bridges paved in 2015 and 2018 with epoxy asphalt concrete bridge pavement, a U.S. product, are currently in public service without any problems. In this study, we would like to analyze the problems of epoxy asphalt concrete bridge pavement, which was introduced for the first time in Korea, and the case of early damage. In addition, we would like to analyze the characteristics of epoxy asphalt concrete bridge pavement, which is an American product, and suggest a plan to be constructed with excellent quality in Korea in the future based on accumulated experience. - COLLAPSE
    June 2021
  • Scientific Paper

    Analysis of aging discrepancy and serviceability by mixing method of recycled asphalt mixture

    혼합방법에 따른 순환아스팔트 혼합물의 노화상태 차이와 공용특성 분석

    Yeongsam Kim, Kyongae Ahn, Kwang W. Kim and Sungun Kim

    김영삼, 안경애, 김광우, 김성운

    This study was designed to analyse the short-coming of conventional instant mixing (IM) method for recycling reclaimed asphalt pavement (RAP) in recycled ... + READ MORE
    This study was designed to analyse the short-coming of conventional instant mixing (IM) method for recycling reclaimed asphalt pavement (RAP) in recycled mix. During this IM process, RAP and new materials are instantly mixed in a mixer for a short time period without knowing the aged binder in the RAP is not properly rejuvenated by virgin binder. To overcome this problem, a new mixing method, that is called a stage mixing (SM) by which the RAP and virgin binder are mixed first and then new aggregates are mixed together, was developed. The objective of this study is to show aging difference between binders on new and RAP in a recycled mix which was produced by IM, and to present how the aging difference is turned out in performance. To evaluate whether or not the RAP binder is rejuvenated well, gel-permeation chromatography (GPC) was used to examine the binder located new and RAP coarse aggregate particles separately in a recycled mix. Indirect tensile strength (ITS), deformation strength (SD), wheel tracking and tensile strength ratio (TSR) tests were conducted to evaluate to performance for both mixtures. Results showed that there were significant aging level differences between the mixes produced by IM and SM. The mixes by IM were turned out to show higher stiffness and poorer serviceability performances than the mixes by SM in all four testing evaluated in this study. Therefore, it was concluded that the recycled mix should be produced by stage mixing technique for better performing recycled mixes. - COLLAPSE
    June 2021
  • Scientific Paper

    Performance evaluation of asphalt pavements for bicycle road

    자전거도로용 아스팔트 포장 성능 평가

    Kyu-dong Jeong and Seong-Lin Yang

    정규동, 양성린

    Various asphalt pavement was constructed and evaluated to find ways to reduce damage to bicycle road pavement. The results showed that the ... + READ MORE
    Various asphalt pavement was constructed and evaluated to find ways to reduce damage to bicycle road pavement. The results showed that the 10 mm asphalt mixture had a higher indirect tensile strength and a lower cantabro loss rate compared to the 13 mm asphalt mixture, and similar skid resistance. Warm-mix asphalt mixtures were evaluated to perform well in most cases compared to HMA. Porous asphalt pavements with resin binder had a high cantabro loss late compared to straight asphalt binder. - COLLAPSE
    June 2021
  • Technical Notes

    The reaction and effects of titanium dioxide (TiO2) used as the material of photocatalytic-pavement-method

    광촉매포장의 재료로 사용되는 이산화티타늄(TiO2)의 반응과 효과

    Il Hwan Kang, Tae Soon Park, Young In Lee and Dong Min Cho

    강일환, 박태순, 이영인, 조동민

    Photocatalyst research started with hydrogen production using photolysis of water in 1972 and has recently been expanded to various fields such as ... + READ MORE
    Photocatalyst research started with hydrogen production using photolysis of water in 1972 and has recently been expanded to various fields such as decomposition of environmental pollutants, odor removal, and antibacterial. As a photocatalyst is also applied to asphalt pavement, photocatalytic pavement is attracting attention as an alternative to fine dust reduction. This study aims to understand the principle and construction method of photocatalyst packaging by studying the reaction and effect of titanium dioxide used as a photocatalyst as a literature study. Titanium dioxide decomposes pollutants through a strong reduction reaction in which excited electrons and holes are generated in response to light, and active oxygen and hydroxyl groups are generated. It was confirmed through research cases that nitrogen gas is reduced when titanium dioxide is coated on asphalt pavement. - COLLAPSE
    June 2021
  • Scientific Paper

    Performance characteristic analysis for the pavement on approach slab

    교량 접속부 포장의 공용 특성 분석

    Kyungha Lee

    이경하

    Deteriorations of pavement on the approach slab that connects the bridge and pavement section have been frequently generating. The objectives of this ... + READ MORE
    Deteriorations of pavement on the approach slab that connects the bridge and pavement section have been frequently generating. The objectives of this research are to find the main sources that can cause pavement deteriorations. This research investigated the causes of pavement distresses on the approach slab and suggested possible maintenance approaches. According to the on-site investigation, the cracking of slab, the displacement of abutment and the void under the slab is found mainly. The big void is mainly found by the loss of backfill materials more than the void of slab. From the result of the IRI survey results of approach slab, it is examined that the standard distance of IRI survey on the approach slab is 20m. The maximum settlement is found between buffer slab and pavement. - COLLAPSE
    June 2021
  • Scientific Paper

    A case study on the seismic stability evaluation of reclaimed land for road

    도로 성토지반에 대한 지진시 안정성평가 사례연구

    Jae-Soon Choi

    최재순

    Liquefaction earthquake damage occurred in Pohang in 2017. Since then, there is a growing opinion that count-measures for seismic road stability are ... + READ MORE
    Liquefaction earthquake damage occurred in Pohang in 2017. Since then, there is a growing opinion that count-measures for seismic road stability are needed. In particular, research on securing seismic road safety in the reclaimed land with a high possibility of liquefaction is receiving great attention. In this study, an earthquake stability evaluation was performed on the road filled ground to be built in a large-scale reclaimed area in the West Sea. At this time, the dynamic behavior of the reclaimed land for road was predicted through numerical simulation using the effective stress analysis model and the shaking table test. - COLLAPSE
    June 2021
  • Scientific Paper

    A study on the characteristics of waterproof layer breakage of steel deck plate bridges in the field

    현장에서 공용중인 강상판 교량의 방수층 파손 특성 연구

    Jung Hoon Jin and Youngdoo Jang

    진정훈, 장영두

    Domestic steel plate bridges have various waterproofing methods. Waterproofing of bridges shall be conducted to prevent rust that may occur on steel ... + READ MORE
    Domestic steel plate bridges have various waterproofing methods. Waterproofing of bridges shall be conducted to prevent rust that may occur on steel plates. The waterproofing of the bridge face of the steel plate is also related to the paving to be constructed on the waterproof layer. This study aims to investigate and analyze the waterproof methods of steel plate bridge in Korea. In addition, several steel plate bridges in Korea that had problems with waterproofing were investigated for damage in waterproofing during the re-paving process. In addition, the waterproof condition of the bridge was investigated during the inspection of the steel plate bridges. Through these data surveys, we intend to analyze the characteristics of the waterproof layer of steel plate bridges. As a result of this study, the waterproofing method of steel plate with Guss asphalt paving method and rubber asphalt waterproofing method showed excellent anti-corrosion effect. - COLLAPSE
    June 2021