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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Highway Engineering
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Journal DOI :
Korean Society of Road Engineers
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Volume & Issues
Volume 13, Issue 4 - Dec 2011
Volume 13, Issue 3 - Sep 2011
Volume 13, Issue 2 - Jun 2011
Volume 13, Issue 1 - Mar 2011
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Landscape Preference and Image Property according to Middle Span and Sag Ratio of the Suspension Bridge
Jang, Young-Ju ; Son, Seung-Neo ; Kum, Ki-Jung ; Oh, Heung-Un ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 1~11
DOI : 10.7855/IJHE.2011.13.1.001
This study is aimed at suggesting a plan for creating a landscape environment by grasping a landscape preference according to the change of middle span and sag ratio which is a consideration factor when designing the suspension bridge representing long-span bridges and image property of the bridge while applying SD method to a relation between landscape preference and image factor, and a connection of design element with image factor. An analysis on landscape preference about the bridge landscape showed from what the longer the length of middle span, the extent of sag ratio of preference decreased, the longer the middle span low sag ratio was preferred and the higher the landscape preference became. In landscape preference and image factor, the attribute of sag ratio with high landscape preference was all positively correlated with "stability", "plasticity", and "aesthetic" but an influence of "plasticity" was insignificant. In the relation between design element and image factor, the factor of middle span and sag ratio was more related to the factor of "stability" and the lower the sag ratio and the longer the middle span, the higher the "stability" was rated. This result showed the image property of "plasticity" was insignificant among the one of preference in landscape and to highlight the one of "plasticity" a complementary experiment was done with a change in balance and symmetry elements not in proportional element of middle span and sag ratio. The result showed the image property of "plasticity" was more highlighted in the suspension bridge of 3-tower and different bilateral symmetry at sag, and when designing the landscape of suspension bridge later on, the elements of balance and symmetry as well as the proportional element should be considered and reflected in the design.
Analyzing the Characteristics of Traffic Accidents and Developing the Models by Day and Night in the Case of the Cheongju Arterial Link Sections
Kim, Tae-Young ; Lim, Jin-Kang ; Park, Byung-Ho ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 13~19
DOI : 10.7855/IJHE.2011.13.1.013
The purpose of this study is to analyze the characteristics of traffic accidents and to develop the models by day and night-time in the case of the arterial link sections. In pursuing the above, this study uses the 224 accident data occurred at the 24 arterial link sections in Cheongju. The main results analyzed are as follows. First, it was analyzed that the number of accidents during day was more than night, but the accidents rate during night was higher than day. Second, four models which were all statistically significant were developed. Finally, the differences between the day and night models were comparatively analyzed using independent variables.
A Study on The Frost Penetration Depth of Pavement with Field Temperature Data
Shin, Eun-Chul ; Lee, Jae-Sik ; Cho, Gyu-Tae ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 21~32
DOI : 10.7855/IJHE.2011.13.1.021
The frost penetration depth of pavement is usually estimated from the freezing index that made temperature data analysis of 30 years and decided the thickness of anti-frost layer. The field monitoring region in study was divided into five regions by freezing index 550~650
day and 350~450
day. Each region has three-section of road pavement such as cutting area, boundary area of cutting and banking, and lower area of banking. The field monitoring system was established both in the section of anti-frost layer and in the section without anti-frost layer. The data analysis was conducted for determination of frost penetration depth within the paved road by the field monitoring system. The result showed that The temperature of subgrade without anti-frost layer shows below zero in centigrade for the region of freezing index 550~650
day, up and down around zero degree in subgrade for the region of freezing index 450~550
day, and there is no place existed below zero degree in subgrade for the region of freezing index below 450
day. With comparison of field frost penetration depth for the cross-sections of pavement, the cutting area shows the greatest frost penetration depth, and less influence of frost penetration depth for the boundary area of cutting and banking, and the least influenced for the lower area of banking.
A Study on Establishing the Subbase Compaction Control Method based on the In-situ Elastic modulus
Choi, Jun-Seong ; Kim, Jong-Min ; Han, Jin-Seok ; Kim, Bu-Il ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 33~40
DOI : 10.7855/IJHE.2011.13.1.033
The resilient modulus which is presented mechanical properties of compacted subbase material is the design parameter on the Mechanistic - Empirical pavement design guide. The compaction control method on the Mechanistic - Empirical pavement design guide will be the way to confirm whether the in-situ elastic modulus measured after the compaction meets the resilient modulus which is applied the design. The resilient modulus in this study is calculated by the neural network suggested by Korea Pavement Research Program, and degree of compaction as the existing compaction control test and plate bearing capacity test(PBT) was performed to confirm whether the in-situ elastic modulus is measured. The Light Falling Weight Deflectometer(LFWD) is additionally tested for correlation analysis between each in-situ elastic modulus and resilient modulus, and is proposed correlation equation and test interval which can reduced overall testing cost. Also, the subbase compaction control procedure based on the in-situ elastic modulus is proposed using the in-situ PBT and LFWD test result.
An Experimental Evaluation and Comparative Evaluation on Pavement Design of Warm-Mix Asphalt Mixture Using Aspha-min
Jin, Myung-Sub ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 41~48
DOI : 10.7855/IJHE.2011.13.1.041
Warm-Mix Asphalt(WMA) mixtures, which meet environmental protection and have high energy efficiency, are emerging as an alternative to hot-mix asphalt mixtures. The objective of this study is to evaluate WMA made with Aspha-min in the laboratory and to compare the design results accomplished by new Mechanistic-Empirical Pavement Design Guide(MEPDG) with control mixture. An asphalt mixture with a nominal maximum size of 12.5mm and PG64-28 binder was used. Resilient modulus tests for a control mixture and WMA with 0.3% and 0.5% of Aspha-min were conducted. The results obtained by MEPDG after inputting the test output into the design indicated that the predicted rut depth of WMA using Aspha-min was much lower than that of control mixture, and showed that WMA was more resistant to rutting than control mixture.
Developing the Traffic Accident Models by the Function of Arterial Link Sections in the Case of Cheongju
Kim, Jin-Sun ; Kim, Tae-Young ; Kim, Kyung-Hwan ; Park, Byung-Ho ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 49~57
DOI : 10.7855/IJHE.2011.13.1.049
This study deals with the traffic accident of arterial link sections in the case of Cheongju. The purpose of the study is to develop the traffic accident model by the function of arterial links. In pursuing the above, this study gives particular attentions to developing the appropriate models using the accident data of main and minor arterial roads divided by 472 small link sections. The main results analyzed are as follows. First, as the t test on the accident characteristics of main and minor arterial roads shows that there are differences in the number of accident and EPDO(equivalent property damage only) between two roads, the development of models by function is analyzed to be appropriate. Second, it is analyzed that ZINB models are all statistically suitable to the number of accident and EPDO of main arterial roads. Third, the analysis shows that EPDOs of minor arterial roads fit to ZINB, and the number of the accident fit to ZIP model. Finally, the common variables of main arterial roads are evaluated to be the traffic volume and the number of inflection point, and those of minor be the average grade.
Effectiveness of Positive Guidance for Speed Reduction at Signalized Intersection by Using Driving Simulator
Noh, Kwan-sub ; Lee, Jong-hak ; Kim, Jong-min ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 59~67
DOI : 10.7855/IJHE.2011.13.1.059
It can prevent traffic accidents in a way as taking precautionary measures for road safety at signalized intersection in advance. Particularly, traffic accidents can be reduced at relatively low cost without redesigning alignments. That is 'Positive Guidance method' which can help prevent traffic accidents through improvement of road facilities at signalized intersection. In this study, potentially higher hazardous signalized intersection due to speeding was selected through site investigation. Field analysis at designated section was conducted and devised a plan for improvements of road facilities. Subjects drove in driving simulator in 3-D virtual reality of designated intersection. Based on data from simulator, statistical analysis(t-verification) was conducted for 'Before and After effectiveness' of speed reduction. As a result, it indicates that speed reduction was effective after improvements at each spot in driving simulator. In the future, hazardous signalized intersections which can be applied for PG method will be effective for road safety based on this research.
Development of Traffic Accident Frequency Prediction Model in Urban Signalized Intersections with Fuzzy Reasoning and Neural Network Theories
Kang, Young-Kyun ; Kim, Jang-Wook ; Lee, Soo-Il ; Lee, Soo-Beom ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 69~77
DOI : 10.7855/IJHE.2011.13.1.069
This study is to suggest a methodology to overcome the uncertainty and lack of reliability of data. The fuzzy reasoning model and the neural network model were developed in order to overcome the potential lack of reliability which may occur during the process of data collection. According to the result of comparison with the Poisson regression model, the suggested models showed better performance in the accuracy of the accident frequency prediction. It means that the more accurate accident frequency prediction model can be developed by the process of the uncertainty of raw data and the adjustment of errors in data by learning. Among the suggested models, the performance of the neural network model was better than that of the fuzzy reasoning model. The suggested models can evaluate the safety of signalized intersections in operation and/or planning, and ultimately contribute the reduction of accidents.
Evaluation of the Performance on Coating on Roller Compacted Concrete Pavement for Bike Roads
Lee, Chang-Ho ; Lee, Seung-Woo ; Kim, Seong-Kil ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 79~86
DOI : 10.7855/IJHE.2011.13.1.079
Recently, usage bicycle is encouraged to reduce fuel consumption and air pollution. For this purpose, bike road constructions are actively performed. However, types of pavement used in bike roads have high construction cost and performance comparing the required capacity of bike roads. Thus, an economical pavement type for construction is necessary for the effective development. Roller compacted concrete pavement have good requirements, such as easy construction and low costs, high structural performance of hydration and internal communication aggregation on compaction for bicycle roads. However, the pool landscape surface and resistance to deicer damage cannot be applied to the construction of bicycle roads. Thus, for solving this problem used coating which may have effect of improving the landscape and environmental resistance. To examine this effect were evaluated performance of roller compacted concrete pavement on the coating.
A Study on the Development of Green Road System for Heat Energy Harvesting
Jo, Byung-Wan ; Lee, Duk-Hee ; Lee, Dong-Yoon ; Lee, Chang-Sub ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 87~96
DOI : 10.7855/IJHE.2011.13.1.087
According to adverse effects of ecosystems due to a bulk of fossil fuel consumption, utilization of sustainable and renewable energy is required. In this paper, converting the energy crisis into an opportunity of new growth is expected by converting heat energy in asphalt pavement into electric power using thermoelectric effect. For this, experiments of inserting heat collector pipe and thermoelectric element into asphalt were performed, and the electric power of heat energy harvesting was measured for development of efficient harvesting system of heat energy. As the results of experiments, electric conversion of average 19.86W per day is possible at
conversion area at a depth of 5cm, and possibility of this system was confirmed. Consequently, a systematic "Green Road" using sustainable heat energy source in asphalt pavement simultaneously with environmental maintenance and econovic growth was suggested.
Freeway Crash Frequency Model Development Based on the Classification of Geometric Alignment Type
Kim, Sang-Youp ; Choi, Jai-Sung ; Lee, Soo-Beom ; Kim, Seong-Min ; Cho, Won-Bum ; Kim, Yong-Seok ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 97~105
DOI : 10.7855/IJHE.2011.13.1.097
This paper presents how one can investigate the effects on crash occurrence of freeway geometric design elements including the horizontal, vertical alignment and road environment. At present, the available research results for the most part involve geometric data analysis that are obtained along a relatively long section of freeway, and, because of the long section's diverse geometric conditions, the results tend to miss the specific local geometric impacts on vehicle crashes. In this regard, this research attempts to establish vehicle crash models based on a set of freeway geometric patterns whose crash generating characteristics are identical because they are homogeneous in terms of producing the same vehicle operating speeds, and subsequently their actual relationships are described by providing statistical analysis made in this research. Also each standard is comprised of part of straight, curve and continuous curve. This research has revealed that each type of model has different relation between accident and geometry structure. This research results should be useful for doing more reasonable highway designs and safety audit analysis.
Valuation of Road Guard System to Reduce Road-Kills
Lee, Byung-Joo ; Kim, Tae-Sik ; Chung, Bong-Jo ; NamGung, Moon ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 107~118
DOI : 10.7855/IJHE.2011.13.1.107
This study carries out to evaluate the value of introducing the road guard system that merges the function of a fence that induces wild animals and a grass inhibitor to an existing guard rail that acts as road safety facilities. For this purpose, we surveyed that road user's willingness-to-pay and recognition characteristics for road safety facilities using contingent valuation Method. By establishing a willingness-to-pay assumption model, the average willingness-to-pay was 5,018 won, which was higher than the average proposed amount of 3,883 won and shows that the road guard system is an appropriate alternative facility to increase road safety and reduce road kills. Therefore, it would be prudent to review the introduction of the road guard system to newly constructed roads or current roads in operation as a way of reducing road kills. In the future, the road guard system must be tested in areas that are highly susceptible to road kills after consulting with the relevant highway managing authorities to conduct a comparison study on the before and after installation effect of the road guard system to investigate its operation and the current status of road kills to clearly identify its effectiveness.
The Effects Analysis and Model Project on Speed Management in Commerical Area Street
Shim, Kywan-Bho ; Heo, Nak-Won ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 119~127
DOI : 10.7855/IJHE.2011.13.1.119
The main purpose of this paper is to apply Zone 30 system which is being experimented in advanced country for the solution of controlling the residential street's speed to our country with the consideration of the real condition of our street and traffic and to run this system as an example to analyze the effect and at the same time, analyze the problem and get appropriate preparation for this system to be widespread. The area to run this model project is Goyang City Ilsan-Gu.(
) which is close with the commercial area reflecting the opinion of experts and an on-site verification by the National Police Agency T/F and is having a heavy pedestrian traffic and the risk of pedestrian accident. Firstly we defined residential street and residential street area to review the system and devided the residential street type to establish a plan of operation. Afterwards, we thoroughly examined the model project area and analyzed the problem and solution. We finally completed establishing a facilities by conference with a local autonomous entity with the improvement of facility's sketch at the analysis of the model project area. The result of effects analysis which we devided after and before of establishment is that vehicle speed be reduced 5~15km/h, and traffic accidents has decreased by 24 percent.
Assessment of Environment - Friendly Degree in Road routes
Kang, Ho-Geun ; Kim, Sang-Tae ; Kim, Heung-Rae ; Park, Tae-Kweon ; An, Seong-Sun ; Lee, Sang-Eun ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 129~138
DOI : 10.7855/IJHE.2011.13.1.129
This research has proposed a quantitative environmental assessment method of road routes based on the various policies and literature, and applied such proposal to the planned road routes to evaluate the environment-friendly road routes. Accordingly, the case sections per each region of Joong-bu, Gang-won, and Nam-bu were selected to execute the proposed environmental assessment method. Consequently, it has been confirmed that the distribution of environmental score of the subject region of each case section varied. In particular, for the Gang-won region, the high scores took up the most. Also, to indicate the degree of environment per each section, a route which minimizes the environmental effects per subject region was created to analyze the environmental degree per each section. As a result, the section in the region with the highest environmental sensitivity, in other words the Gang-won region with many high scores, had the lowest environmental degree.
A Study on the Application of Very Rapid Hardening Acrylic Polymer Modified Concrete for Bonded Concrete Overlay Method
Lee, Seung-Woo ; Kim, Young-Kyu ; Lee, Poong-Hee ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 139~148
DOI : 10.7855/IJHE.2011.13.1.139
Asphalt concrete overlay method is used by general maintenance and rehabilitation of construction for aged concrete pavement in Korea. However, in case of the AC overlay method to extend service life of the existing concrete pavements, various distresses of reflection crack, pothole and rutting are the typical problems of the asphalt overlay on existing concrete pavement since it has different physical characteristics between asphalt overlay and existing concrete pavement. To achieve this, application of concrete overlay method is required instead of AC overlay method. Concrete overlay method has advantages that can reduce maintenance cycle and costs since it has excellent bearing value for heavy vehicles and no rutting. However, technical problems of detour road construction, traffic control and other disadvantages happened by long curing time. Thus, in this study and experimental research were launched to evaluate the workability, durability and resistance against environmental loading of Very Rapid Hardening Acrylic Polymer Modified Concrete(VRH-APMC) for application of bonded concrete overlay method. Test results showed that the compressive and bond strength were exceed 21MPa and 1.4MPa of target strength after four hours for rapid traffic opening properties. And tests of resistance against environmental loading results showed that VRH-APMC secured excellent durability. Thus, it was known that VRH-APMC was suitable material for large scale bonded concrete overlay method, and it was possible to use maintenance and rehabilitation method which needs enough workability and rapid traffic opening.
The Simulator Study on Driving Safety while Driving through the Longitudinal Tunnel
Ryu, Jun-Beom ; Sihn, Yong-Kyun ; Park, Sung-Jin ; Han, Ju-Hyun ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 149~156
DOI : 10.7855/IJHE.2011.13.1.149
Considerable evaluation is needed to design a new longitudinal tunnel in advance because it damaged drivers' driving safety and heightened the possibility of traffic accidents with its physical characteristics. Specifically, considering traffic psychological and ergonomic factors was very important to prevent the difficulty of maintaining safe speed, the increase of the drowsy driving, the fatality of traffic accidents, and subjective feelings such as anxiety while driving a car through the tunnel, from design to construction. This study dealt with driving safety evaluation of an original road alignment design for the longitudinal tunnel (length: above 10km) with a driving simulator, and helped us to improve an original road alignment design and make an alternative road alignment design with presenting risky districts. The results of experiment showed that inflection points were revealed more risky districts, because they impaired driving safety and elevated driver workload while driving a car through around the inflection points of two-way route. Finally, the limitations and implications of this study were discussed.
Variation of Image Analysis Results for Determining the Characteristics of the Air-Void System on Hardened Concrete
Jeon, Sung-Il ; An, Ji-Hwan ; Lee, Jin-Beom ; Kwon, Soo-Ahn ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 157~168
DOI : 10.7855/IJHE.2011.13.1.157
Recently, the cases of freeze-thaw distress on concrete pavement in domestic have been reported periodically. Hereupon, the necessity to establish the standard of spacing factor came to the fore. The test method for analyzing spacing factor is provided in the standard of ASTM C 457. Since researchers tend to judge study results subjectively, the results should be revised throughly. Image analysis program for determining the characteristics of air-void system on hardened concrete identify air void through the difference of a color. The pixel intensity values used in this program have a significant effect on the analysis results. This study compared the automated void count by varying pixel intensity values with the manual void count in order to determine the optimum range of pixel intensity values. Also, this study analyzed the air-void characteristics on eight kinds of concrete mixtures. In this study, it was confirmed that the variation of void counted manually was around 10% from the results of round robin test, and that the optimum range of pixel intensity values is around 80~90. And it was also confirmed that air content (as a whole) was increased generally and spacing factor was decreased by increasing air-entrainer content. But some concrete mixtures showed a tendency that air content was constant and spacing factor was decreased by increasing air-entrainer content. This causes the air entrained by air-entrainer has more influence on spacing factor than air content. Also, the deviation of spacing factor by cutting position of concrete specimen was about 30~100
because of the limit of 2-D image analysis. The additional study about variation of spacing factor by cutting position of concrete specimen will be performed later.
An Experimental Study on Relation between compressive strength and Shear Wave velocity for characteristics of coarse aggregate size and type of cement
An, Ji-Hwan ; Jeon, Sung-IL ; Nam, Jeong-Hee ; Kwon, Soo-Ahn ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 169~175
DOI : 10.7855/IJHE.2011.13.1.169
Strength is one of the very important factors to evaluate the physical properties of concrete. Aggregate forms the most parts in concrete. Cement as a binder in concrete is also closely related to strength. This experiment was tested to understand the effect of the characteristics of aggregate and cement on the relationship between concrete compressive strength and Shear Wave velocity. It was experimented by the different types of cement and maximum coarse aggregate sizes. Type I cement and rapid setting cement was used. Aggregates from three different regions were used. Aggregate of 19mm and 13mm maximum coarse aggregate sizes was used for grading. The relationship between compressive strength and Shear Wave velocity was tested under the condition of same mixture. LA wear test was used to quantify the characteristics of aggregate. As a result, the relationship between concrete compressive strength and Shear Wave velocity was affected by the types of cement, but regular relationship was appeared regardless of types of aggregate, grading and abrasion ratio.
Field Application Evaluation of Black VES-LMC
Jung, Won-Kyong ; Kil, Yong-Su ; Kim, Yong-Bin ; Yun, Kyong-Ku ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 177~183
DOI : 10.7855/IJHE.2011.13.1.177
VES-LMC(very-early strength latex modified concrete) has been widely used as repair material for bridge deck overlay or rehabilitation, because it could be opened to the traffic after 3 hours of curing. However, the bright color of VES-LMC disturb driver's sigh. A black VES-LMC, matching to asphalt concrete, was developed and applied at a filed for driver's comfort and safety. The black VES-LMC included 2% carbon black in cement weight ratio. A series of performance evaluation for black VES-LMC was done in terms of field applicability, pavement color and temperature change. The field applicability test result showed that there were no change of workability, slump and air void, and the compressive strengthen developed more than 20MPa after 4 hours of placement. The thermal stress of black VES-LMC was smaller than that of OPC and asphalt concrete, which means the stability of black VES-LMC. The performance evaluation result showed that the black VES-LMC could prevent road icing at below zero temperatures and promote thawing at melting temperature.
A Study on Evaluation of Aircraft Rapid Arresting System Using the Numerical Analysis
Lee, Young-Soo ; Kim, Choon-Seon ; Ha, Wook-Jai ; Han, Jae-Hyun ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 185~195
DOI : 10.7855/IJHE.2011.13.1.185
Aircraft-related accidents cause mass casualties and major material damages. At present, runway-related accidents in our country account for 28% of all air accidents. Furthermore, internationally 33% of all air accidents is connected with runway. To prevent these accidents, FAA mandates the installation of aircraft rapid arresting system(ARAS) at the runway end safety areas which do not meet the FAA requirements. Even if the areas satisfy the conditions, FAA recommends the installation of ARAS to ensure the safety. In accordance of the international affairs, the domestic studies for ARAS are in progress and the legal formalities for domestic adoption of ARAS is under way. In this study, we analyzed the stopping distance, drag force, vertical force and tire penetration of runway overrun to assess the performance of ARAS reasonably by using two different kinds of analysis programs. The first is ARRESTOR program adopted by FAA, and the second is LS-DYNA which is available for 3-dimensional nonlineal dynamic analysis. As a result, analytically the stopping distances between two programs are similar. The drag force is rather different, but the tendencies are similar. Later on, the 3-dimensional simulation analysis considering various air-craft condition and properties of packaging materials is necessary. In addition, ongoing development of simulation analysis program is required for more accurate analistic results.
Applicability of K-path Algorithm for the Transit Transfer of the Mobility Handicapped
Kim, Eung-Cheol ; Kim, Tea-Ho ; Choi, Eun-Jin ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 197~206
DOI : 10.7855/IJHE.2011.13.1.197
The Korean government concentrates on supplying public transit facilities for the mobility handicapped. In other hands, increasing needs of transfer information when the mobility handicapped use transit facilities are substantial but not satisfactory as a whole. This study focuses on evaluating the applicability of developed K-path algorithm to provide user-customized route information that could make an active using of public transit while considering the mobility handicapped preferences. Developed algorithm reflects on requirements considering transfer attributes of the mobility handicapped. Trip attributes of the handicapped are addressed distinguished from handicapped types such as transfer walking time, transfer ratio, facility preferences and etc. This study examines the verification and application of the proposed algorithm that searches the least time K-paths by testing on actual subway networks in Seoul metropolitan areas. It is shown that the K-path algorithm is good enough to provide paths that meet the needs of the mobility handicapped and to be adoptable for the future expansion.
A Study for the factors affecting to the life of Asphalt Overlay on Aged Cement Concrete Pavement
Son, Hyeon-Jang ; Askhat, Turgynbekuly ; Kim, Young-Kyu ; Lee, Seung-Woo ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 207~221
DOI : 10.7855/IJHE.2011.13.1.207
More than sixty percentage of highway in South Korea were constructed by concrete pavements and more than half of the concrete pavements were twenty years or older. The most of highway have difficulty in providing detour due to the traffic and road condition of South Korea. So far, asphalt concrete has been used for the overlay of aged cement concrete pavement. However, the frequent early damage and maintenance of typical asphalt overlay due to repetitive maintenance causes inconvenience of road users and expensive costs. It is necessary to investigate the factors affecting the performance of asphalt concrete overlay to improve the performance of asphalt overlay. However, the performance data of asphalt concrete overlay in South Korea does not exist. In this research, to investigate on the factors affecting the life of asphalt concrete overlay was attempted based on statistical analysis of the performance data of asphalt concrete overlay included in LTPP (Long-Term Pavement Performance) Database of U.S.A.
Behavior and Design of Terminal Joint Width between Post-Tensioned Concrete Pavement and Jointed Concrete Pavement under Temperature Changes
Kim, Dong-Ho ; Lee, Bong-Hak ; Kim, Seong-Min ; Park, Seong-Tae ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 223~228
DOI : 10.7855/IJHE.2011.13.1.223
The initial joint width design of the terminal joint between post-tensioned concrete pavement (PTCP) and jointed concrete pavement (JCP) was studied in this research. The joint width between PTCP and JCP directly affects noise and ride quality. If the initial joint width is very large, noise increases and ride quality decreases. If the initial joint width is very small, on the other hand, under high temperatures, PTCP slabs can blow up, or failures near the joint can occur due to excessive compressive stresses. The terminal joint width behavior between PTCP and JCP near Jumunjin at Donghae expressway under temperature changes was measured in August and November 2010 and the data was analyzed. From this study, the design methodology of the optimal initial terminal joint width was proposed.
Early-Age Behavior Monitoring of Bus-Stop-Section Pavement Constructed Employing Precast Concrete Pavement Method
Oh, Han-Jin ; Kim, Seong-Min ; Hwang, Ju-Hwan ; Park, Won-Joo ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 229~237
DOI : 10.7855/IJHE.2011.13.1.229
This study was conducted to investigate the early-age performance of precast pavements constructed by replacing existing asphalt pavements for a bus stop section in urban bus only lanes. The behavior monitoring items included the differences in the levels between asphalt and precast pavements at the entrance and exit of the precast pavement, joint widths and level differences between precast slabs, slab settlement, and skid resistance at the slab surface. The applicability of diamond grinding techniques was also investigated. The results of this study showed that the slab level, joint width, settlement, and skid resistance were not much changed as time passed, which implied that the precast pavements stably sustained vehicle loads. It was also found that employing diamond grinding could much improve the leveling between precast slabs and the surface skid resistance.
Numerical Analysis of Fiber Reinforced Concrete Base Subjected to Environmental Loads
Cho, Young-Kyo ; Kim, Seong-Min ; Park, Jong-Sub ; Park, Young-Hwan ;
International Journal of Highway Engineering, volume 13, issue 1, 2011, Pages 239~249
DOI : 10.7855/IJHE.2011.13.1.239
The behavior of the fiber reinforced concrete (FRC) base under environmental loads was analyzed numerically as a fundamental study to develop a high structural and functional performance composite pavement system in which the base was formed using FRC and the asphalt or cement concrete surface was placed on it. A two-dimensional finite element model of the FRC base was developed and the sensitivity study was performed with the variables including slab thickness of base, thermal expansion coefficient, elastic modulus, and tensile and compressive strengths. The crack spacing and crack width were selected as representatives of the base behavior. The effects of the selected variables on the crack spacing and crack width were analyzed and the sensitive variables were determined. The results of this study could be useful to determine the optimal material properties of the FRC base for combining well with the surface materials.