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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 19, Issue 3_6 - Nov 1999
Volume 19, Issue 2_6 - Nov 1999
Volume 19, Issue 1_6 - Nov 1999
Volume 19, Issue 3_5 - Sep 1999
Volume 19, Issue 2_5 - Sep 1999
Volume 19, Issue 1_5 - Sep 1999
Volume 19, Issue 3_4 - Jul 1999
Volume 19, Issue 2_4 - Jul 1999
Volume 19, Issue 1_4 - Jul 1999
Volume 19, Issue 3_3 - May 1999
Volume 19, Issue 2_3 - May 1999
Volume 19, Issue 1_3 - May 1999
Volume 19, Issue 3_2 - Mar 1999
Volume 19, Issue 2_2 - Mar 1999
Volume 19, Issue 1_2 - Mar 1999
Volume 19, Issue 3_1 - Jan 1999
Volume 19, Issue 2_1 - Jan 1999
Volume 19, Issue 1_1 - Jan 1999
Selecting the target year
Estimating Delay of Vehicles Entering Roundabouts Using Gap Acceptance Functions
Son, Young-Tae ; Jun, Jin-Sook ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1043~1043
This paper describes a model development to estimate delay of vehicles entering into circulating flow at roundabouts. The model was developed in two steps. First step is developing a function of a gap accepted by drivers entering into circulating flow at stop lines of roundabouts. Logit model was used and the parameters were estimated through field data analysis. Second step is to build a M/G/l queueing model utilizing the established gap acceptance function developed in the first step. The developed model is applied to estimate delay of vehicles at roundabouts which have one circulating flow lane and one approach lane.
Performance Evaluation of Asphalt Concrete Test Pavement Using Aggregate Gradation Against Plastic Deformation in Incheon International Airport
Wee, Seong-Dong ; Yoo, Tai-Sung ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1049~1049
The test pavement, which was designed as the standard structure of asphalt concrete pavement in Incheon International airport, was placed and evaluated to validate its application. After several repetitions using the truck, which can load the capacity of total weight 84 ton, the plastic deformation was severely developed in the surface layer of test pavement. The deteriorated pavement was removed and a new pavement with 15cm thickness was placed in surface layer. For performance test of the pavement the following three conditions were applied. 1) FAA19mm or Superpave gradation, 2) Optimum Asphalt Contents (O.A.C) by AI (MS-2) mixing design method, 3) Dividing surface layer (15cm) by wearing course (5cm) and Intermediate course (10cm). The purpose of the test pavement was to validate the designed standard asphalt cement pavement as well as to evaluate the anti-plasticity and performance of the asphalt mixtures using above conditions in six test sections. The results of laboratory wheel tracking test and in-situ pavement performance showed that the test sections using above three conditions improved the resistance for plastic deformation and decreased the construction cost than other test sections by conventional gradation and mixture design method.
Load Transfer Efficiency of Undoweled Jointed Concrete Pavement
Yun, Kyong-Ku ; Kwon, Soon-Min ; Lee, Joo-Hyung ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1061~1061
The purpose of this research was to analyze the load transfer efficiency of undoweled jointed concrete pavement based on lean concrete layer through a series of FWD tests in field. The results are follows: The load transfer efficiency of the undoweled JCP is dependent on the slab temperature at the time of measuring rather than the age of pavement system, because of larger affect of aggregate interlocking which is heavily depended on the behavior of slab expansion and contraction. The load transfer efficiency of the doweled almost maintain 100% regardless to the variation of slab temperature. However, the load transfer efficiency of the undoweled showed very low values below 50% under the slab temperature of
. The load transfer efficiency is very sensitivity to the slab temperature, thus, care should be taken at field survey. From the analysis of variance the pavement with/without dowel bars exert the most influential variable on the mean and standard deviation of load transfer efficiency at a confidential level around 90 at both of Chungbu highway and 88 highway, followed by FWD survey time and loading levels, sequently. The loading levels within the currently used in this survey didn't affect to the response at all. Thus, the dowel bar was necessary in order to keep load transfer efficiency high and to minimize the joint related distresses.
Analysis of Lab Test Results of a CRM Asphalt Mixture with Wet Process
Lee, Kyung-Ha ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1071~1071
The asphalt mixture with CRM (Crumb Rubber Modifier) is known to show a better performance in resisting thermal cracking, fatigue cracking, and rutting, compared with the conventional mixture. In this research, the lab tests on the physical and the mechanical characteristics of the domestic crumb rubber modified asphalt binder and conventional asphalts (AP-3, AP-5) were conducted. The test result shows that CRM asphalt has better physical characteristics than conventional asphalts and that CRM asphalt mixture has a higher resistance to thermal cracking and toughness than other mixtures. In the wheel tracking test, the gap grade mixture with CRM showed superior performance compared with other mixtures, but open grade mixture was not superior to other mixtures. In the tracking test, the gap grade mixture with CRM showed better resistance than other mixtures, but open grade mixture did not show better resistance than other mixtures.
A Study on the Quasi-static Backanalysis of Layer Properties of Flexible Pavement in Consideration of In-situ Temperature
Choi, Jun-Seong ; Kim, Soo-Il ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1081~1081
Most of the existing backcalculation program can't evaluate the dynamic effect of the deflection basin from the Falling Weight Deflectometer (FWD). Therefore the prototype of quasi-static backcalculation program has been developed, but it needs to be improved for expanding application on the four-layer asphalt concrete pavement with black base in Korea. To determined quasi-static correction factors, 20,412 models with various depths of bedrock are designed based on the parametric study. For all models, quasi-static surface deflections converted from dynamic surface deflections using quasi-static correction factors were compared with static surface deflections calculated by static analysis. Through the comparison study the accuracy and efficiency of quasi-static correction factors are verified. From the Multi-Depth Deflectometer (MDD) test results, it is found that improved backcalculation program gives the most reliable results when compared with results from several other computer codes in use. Backcalculated layer moduli are taken into account the effects of the seasonal and hourly temperature variations. To evaluate a pavement performance, the moduli of asphalt concrete layer predicted by field tests during the specific test periods must be converted into correction moduli with respect to reference temperature. In this study, the relationship between test temperatures and FWD backcalculated moduli is presented based on FWD test results at different temperature conditions. The temperature correction procedure is also suggested using the temperature-FWD backcalculated moduli relationship. Through the comparison study of the seasonal FWD test, it is shown that the relationship proposed in this study and the temperature correction procedure are valid and efficient.
Evaluation of Flexible Pavement Behavior under Various Vehicle Speed
Lee, Kang-Jin ; Choi, Jun-Seong ; Kim, Soo-Il ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1093~1093
The pavement behavior must be evaluated under various vehicle speed when determining the dynamic interaction between the loading vehicle and pavement system. To evaluate the dynamic behavior on asphalt concrete pavement under various vehicle speed, truck moving tests are carried out. Interior deflections of the pavement are measured from Multi-Depth Deflectometer (MDD). From the test results with respect to vehicle speed, it is found that vehicle speed has significant effect on actual response of the pavement system. The lower vehicle speed generate the higher interior deflections, and the lower dynamic modulus. From the results of evaluating the life time (load to failure) using existing performance model, it is found that the life time of pavement is shorter in low vehicle speed than high speed. ABAQUS, a three-dimensional dynamic finite element program (3D-DFEM), is used to analyze flexible pavements subjected to moving load at various speed and compared with In-situ test results. Through the comparison study, it is found that the linear elastic model for pavement behavior under various vehicle speed is not adequate. The procedure to analyze the effect of vehicle speed is presented using visco-elastic concept.
Evaluation of the Hot-In-Place Recycling Method (A Case Study)
Park, Tae-Soon ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1103~1103
Hot in-place recycling was used to rehabilitate a section of roadway in Indiana in 1994. A 25-mm overlay was placed over the recycled layer. Shortly after construction, moderate to severe bleeding was observed in isolated areas throughout the recycled section. This was the first full-scale, mainline usage of hot in-place recycling by the Indiana Department of Transportation, so this bleeding was a cause for concern. This study was carried out to investigate the potential causes of the blee ding of the pavement. Asphalt core samples were taken from the bleeding and non-bleeding areas of the pavement. Test results support the conclusion that the bleeding was not caused by the recycling process or migration of excessive tack coat, but more likely was due to the high and variable asphalt content of the surface layer itself.
Development of Algorithm for Progressing the Positional Accuracy in Dynamic Positioning of GPS
Chang, Yong-Ku ; Kang, In-Joon ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1113~1113
Positional information of moving object was analyzed by radiowave telegraphed in Global Positioning System and displayed in digital map. Dynamic positioning methods using GPS are method analyzing code of GPS and carrier phase method. Positional data of GPS satellite is displayed coordinate system of WGS84 ellipsoid. But Korea is using coordinate system of Bessel ellipsoid. Therefore, we must convert coordinate system on WGS84 ellipsoid acquired by GPS to Bessel ellipsoid using Korea. How to change from WGS84 ellipsoid coordinate to Bessel ellipsoid coordinate are MRE method, Standard Molodensky method, Bursa Wolf method, Molodensky Badekas method. Therefore, the method of map matching and dead reckoning, converting coordinate system, accurate analysis of map projection is paralleled to progress of positional accuracy of dynamic moving. Therefore, author developed the conversion algorithm of coordinate system about MRE, Standard Molodensky, 7- parameter of Bursa-Wolf method and Molodensky-Badekas between WGS84 ellipsoid and Bessel ellipsoid to enhance the positional accuracy of dynamic positioning in this papaer. And author analyzed conversion algorithm of coordinate systems. Author proposed the optimal conversion algorithm of coordinate system.
A Case Study of Tunnel Keyblock Stability Using the Block Theory
Lee, In-Mo ; Park, Jun-Kyung ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1123~1123
Using the actual unrolled joint trace which was developed in the OO telecommunication tunnel during tunnelling, various analysis methods based upon block theory were performed. The deterministic analysis and probabilistic keyblock concept were applied and their results were compared with the observed failure. The deterministic analysis results had a large difference compared with the observed failure pattern. The more was the block failure likelihood (P(B))which was defined by the product of the joint combination probability, the shape parameter and the instability parameter, the more were the frequencies of failures observed. The analysis method which considers the joint combination probability gave more similar results to the observed data than deterministic analysis. Furthermore, individual keyblock analysis was performed by means of the newly developed program. While the positions of the keyblocks were predicted properly by the individual keyblock analysis, the predicted sizes of the keyblocks were found to be different from the observed data due to the effect of the in-situ stress and secondary block.
Verification of the Grouting Effect using Seismic Tests and Back Analysis
Lee, Jun-Seok ; Bang, Chun-Seok ; Mok, Yeong-Jin ; Jo, Seong-Ho ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1135~1135
The reinforcement effect of the grout-reinforcement technique, which has been widely used as a tunnel reinforcement, is not fully investigated so far and, therefore, rules-of-thumb approach or experiments on core specimen have been used to verify the groutability. In this regard, a Spectral-Analysis-of-Surface-Waves (SASW) test as well as a Crosshole test can be employed to determine the reinforcement effect quantitatively and, furthermore, a new design approach on the permeation grouting can also be utilized to estimate the material properties of intact rock and joint stiffnesses. In this study, the above mentioned test and design method are introduced to the tunnel structure under construction and it has been found that the joint stiffnesses can be increased up to 6 times.
A Study on the Utilization of Coal Refuses as Subbase and Layer in Road Construction
Park, Heung-Gyu ; Kim, Nam-Ok ; Choi, Mun-Ho ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1143~1143
This study aims at investigating the chemical and physical properties of coal refuses in order to utilize the coal refuses dumped from the domestic coal mines as subbase and layer in road construction. In this connection, we have made unconfined compression strength and freezing-thawing tests on the cement-added coal refuses to improve their engineering properties. Test results are : It is shown that since coal refuses meet the domestic specification criteria, in the light of compaction, shearing strength, permeability, and CBR, they can be used as subgrade and road bed materials. It is also found out that once we add cement to coal refuses, we can expect to improve durability against unconfined compression strength increase and freezing-thawing, and accordingly to utilize the cement-added coal refuses as subbase and base course.
Characteristics of Longitudinal Discharge Capacity for PDBs and the Effect of Well Resistance
Kim, Soo-Sam ; Kang, Min-Soo ; Lee, Jin-Tae ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1151~1151
For the evaluation of well resistance which is the effect of resistance to the internal flow within the drain, longitudinal discharge capacity tests for the different kinds of PDBs were performed with various test conditions in this study. By analyzing the test results from these tests, proper shapes and composite structures which vertical drains with the adequate performance should retain were described. Eventually, the range of minimum required discharge capacity for field application was presented by analytical comparative study with conventional radial consolidation theories proposed so far.
Study on the Evaluation of Tensile Strength Mobilized during the Installation of PDB (Prefabricated Drain Board)
Kim, Soo-Sam ; Kang, Min-Soo ; Kim, Ji-Yong ; Han, Sang-Jae ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1165~1165
In this study, through the investigation on the tensile strength of PDB which has been broadly in use for numerous fields, it was apprehended that the establishment of appropriate specification for the tensile strength of PDB and the unified procedure for the measurement of tensile strength are imminent for the present. For this, appropriate method of measurement for tensile strength of PDB was presented from laboratory test results with various conditions and the calculation of mobilized strength during the installation of vertical drains was implemented.
The Elasto-Plastic Behavior of Sand-Bentonite Mixtures
Hwang, Shin-Il ; Jeong, Sang-Seom ; Kim, Soo-Il ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_6, 1999, Pages 1179~1179
The undrained behavior of isotropically consolidated clay-sand mixtures was investigated using the automated triaxial testing apparatus. Overconsolidation ratio, effective mean pressure and clay content (up to 20% bentonite) were the factors varied in the experimental investigation. Twenty undrained tests were conducted on clay-sand mixture with clay contents of 10, 15 and 20% by mixing a weighted quantity of the air-dried soils. According to experimental results, there exists an unique failure line whose slope is lower than sand's and higher than clay's. The transition from dominantly sand behavior to a behavior in which the clay has a strong influence appears to occur around 20% for quartz-bentonite mixtures. The test results were analyzed and their behaviors were interpreted within the framework of plasticity constitutive model for clay-sand mixtures. The approach here has certain conceptual links with the Cam clay series of elastio-plastic models, but includes the more general starting assumption that the yield function, plastic potential and failure locus should be given quite distinct mathematical expressions. It is shown that the proposed model is able to predict closely the N.C. and heavily O.C. behavior of mixtures.