다양한 등급 도로에 있어 순환골재 사용 비율에 따른 순환 가열아스팔트의 사용성 검토 연구

정종석,박용부,전진호,이시원,문성호 한국도로학회 2019 한국도로학회논문집 Vol.21 No.4

PURPOSES : The recent increase in the application of reclaimed asphalt pavement (RAP) calls for more research focusing the evaluation of pavement performance. For this matter, this study aims at evaluating pavement performance using the application rate of RAP. METHODS: To obtain mixtures with RAP aggregate application rates of 10%, 25% and 30%, the gyratory compaction method was applied regarding the mix design process for determining the optimum asphalt content (OAC). Additionally, the in-direct tension (IDT) test, deformation strength test (DST), tensile strength ratio (TSR) test and dynamic modulus (DM) test were conducted to verify the effect of RAP application rate on pavement performance. Based on the above-mentioned results, performance evaluation was done to these RAP application of design or utilization to construction site. The performance evaluation analysis was performed using the Korean Pavement Research Program (KPRP) of second level for the pavement design. RESULTS: From the DST results, the rutting resistance was improved as the application rates of RAP were increased. Additionally, all the IDT and toughness results satisfied the quality standards of the asphalt concrete pavement. However, the results did not conform with the tensile strength ratio standards with the application rates of RAP of 25% and 30%. This means that the standards, which should be considered when the addictive regeneration material is applied to the mixture when the RAP application rate is over 25%, were reflected. CONCLUSIONS : The predicted performance decreased from the second level performance analysis with the increase in the RAP application rates. All the cases satisfied the design standards (fatigue cracking, rutting depth and international roughness index (IRI)). However, the results of them closed to these standards (up to 94% (Fatigue)).

運動負荷에 따른 血液成分의 變化 : 1,500m 選手와 射擊 選手를 中心으로 Between 1,500m Runners and Shooters

鄭鍾錫 朝鮮大學校 敎育大學院 1986 敎育論叢 Vol.2 No.5

유럽의 기능성 콘크리트 포장

정종석,조윤호,양성철,이승우,Jeong, Jong-Seok,Jo, Yun-Ho,Yang, Seong-Cheol,Lee, Seung-U 한국도로학회 2004 도로 : 도로학회지 Vol.6 No.4

단지 내 도로 포장설계를 위한 공사차량 대수 추정 방법론 개발 기초연구

정종석,박용부,연규민,김인태,조정연 한국도로학회 2019 한국도로학회논문집 Vol.21 No.5

PURPOSES : As road pavement design in an apartment complex varies from one site to another, it is practically difficult to calculate and estimate the traffic volume of construction vehicles. Therefore, this study introduces a methodology to estimate the number of construction vehicles and use it as an indicator to evaluate the conditions of road pavement in an apartment complex. METHODS: Through a literature review and site survey, the operational status of the construction vehicles passing through the site was identified, and the factors affecting the number of construction vehicles were analyzed. The methodologies used to estimate the number of construction vehicles were verified by calculating the Cumulative Load Prediction Index (CLPI), which is a predictive index of the cumulative load on each path. By using this index, the traffic volume of construction vehicles can be estimated based on the number of households in an apartment complex. To prove this definition, we examined the surface and core conditions, and compared the results against the predicted values. RESULTS : By comparing the Cumulative Load Prediction Index with the crack rate on the pavement surface, we obtained a correlation coefficient of 0.92. Furthermore, the analysis indicated that the core condition rate would decrease as the Cumulative Load Prediction Index increased. This correlation between the Cumulative Load Prediction Index, and the pavement surface and core status demonstrates that the traffic volume can be estimated by considering the number of households. CONCLUSIONS: The Cumulative Load Prediction Index presented in this study is a suitable indicator for estimating the conditions of the road pavement in an apartment complex by considering the number of households in the complex, even if the construction processes and characteristics vary.

주류물류비 절감방안 및 주류물류의 향후 과제

정종석,Jeong, Jong-Seok 한국주류산업협회 1996 주류산업 Vol.16 No.4

시멘트물류 : 경쟁과 협력의 조화

정종석 한국시멘트협회 1997 시멘트 Vol.146 No.-

정숙도 개념을 이용한 Whitetopping 포장의 현장적용

정종석,조윤호,이강원 한국도로학회 2005 한국도로학회논문집 Vol.7 No.1

Maturity method is a non-destructive method for estimating in-place concrete strength as a function of time and temperature. The main objective is to use maturity method determining joint sawing and traffic opening time for whitetopping construction in Korea. Another objective is to investigate the influence of air temperature in the correspondence to slab temperature and maturity value. For determining the joint sawing and traffic opening time, thermachron i-button and strain gage were inserted in the fresh concrete in the slab and a maturity value was calculated at desired times. In-place strength was then estimated from a pre-established relationship between maturity values and compressive strength. The results showed that there are significant differences between the estimated strength obtained from maturity curve and in-place concrete strength. The reasons are that the gain of in-place concrete strength was influenced by several factors in the field such as curing conditions, air temperature, and wind speed etc. Also, the results showed that air temperature had significant influence on slab temperature and maturity value. The slopes of maturity curves exponentially decrease as air temperature decreases. This means that maturity value sharply dropped as air temperature decreases.

개화기 미션 스쿨 스포츠 활동의 체육사적 의의

정종석,임영무 한국교원대학교 학교체육연구소 2013 학교체육연구소지 Vol.20 No.1

The purpose of this study was to find out the introduction process of western sports and sports activities of mission schools from the entrance of Christian missionaries in modern times of Korea to Gyeongsulgukchi (thirty years in Daehan Empire from the p

SWMM-LID 모델을 이용한 토지주택연구원의 물순환 개선효과 평가

정종석,정광욱,강수만,현경학 한국물환경학회 2018 한국물환경학회지 Vol.34 No.3

SWMM-LID was calibrated with flow monitoring data in LHI to evaluate runoff after LID application. The flow rate in the B basin was estimated to be 0.94 and 6.15 for O/S and Dv, respectively. In the A and C basins, the difference between the observed and simulated data was greater than in the B basin. As a result of runoff reduction efficiency by the application of LID facilities, the change of infiltration increased from 34.6% to 45.8% in the entire watershed, and the runoff decreased from 58.8% to 46.3%. In the runoff reduction of each LID facility, rain garden E showed the highest effect with 99.9% and bioretention B showed the lowest effect with 27.5%. In order to evaluate the efficiency of each LID facility, a comparison is made between the pore volume (V) of the LID and the catchment area (A). The runoff showed a runoff reduction effect of about 70% above the 0.1 volume/area (V/A) value. As a result of examining the runoff reduction with LID facilities by the LID module of SWMM, a reasonable design is possible by reflecting the appropriate LID volume to drainage area.

도심지 내 복층 저소음포장 설치에 따른 소음저감 사례연구

정종석,손정락,이수형,양홍석 한국도로학회 2016 한국도로학회논문집 Vol.18 No.5

PURPOSES : In this study, noise reduction effect of a two-layer porous asphalt pavement was investigated through site measurement and computer simulation. METHODS: To examine noise reduction effect, a 3 km long quiet pavement was installed by removing previous normal pavement, which had a rather low porosity. The studied site was a high-rise apartment building surrounded by the quiet pavement and Seoul ring road with heavy traffic volume, indicating relatively high background noise. RESULTS: The measurement result before and after installing the quiet pavement showed a noise reduction effect of 4.3 dB(A) at a distance of 7.5 m from the road. After validating the accuracy of simulation using SoundPLAN, the reduction in SPL(sound pressure level) at the facades by the quiet pavement was predicted by considering five different road conditions generating traffic noise from each road or in the combination of the quiet pavement and Seoul ring road. In the case of no noise from Seoul ring road, noise reduction at the facades was 4.2 dB(A) on average for 702 housing units. With background noise from Seoul ring road, however, the average SPL decreased to 2.0 dB(A). Regarding subjective response of noise, the number of housing units with a noise reduction of over 3 dB(A) was 229 out of 706 units (approximately 32%). For 77 housing units, the noise reduction was between 1~3 dB(A), while it was less than 1 dB(A) for 400 housing units. CONCLUSIONS: The overall result indicates that the quiet pavement is useful to reduce noise evenly at low and high floors compared to noise barriers, especially in the urban situation where background noise is low.