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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
Korean Society of Civil Engeneers
Editor in Chief :
Volume & Issues
Volume 18, Issue 3_6 - Nov 1998
Volume 18, Issue 2_6 - Nov 1998
Volume 18, Issue 1_6 - Nov 1998
Volume 18, Issue 3_5 - Sep 1998
Volume 18, Issue 2_5 - Sep 1998
Volume 18, Issue 1_5 - Sep 1998
Volume 18, Issue 3_4 - Jul 1998
Volume 18, Issue 2_4 - Jul 1998
Volume 18, Issue 1_4 - Jul 1998
Volume 18, Issue 3_3 - May 1998
Volume 18, Issue 2_3 - May 1998
Volume 18, Issue 1_3 - May 1998
Volume 18, Issue 3_2 - Mar 1998
Volume 18, Issue 2_2 - Mar 1998
Volume 18, Issue 1_2 - Mar 1998
Volume 18, Issue 3_1 - Jan 1998
Volume 18, Issue 2_1 - Jan 1998
Volume 18, Issue 1_1 - Jan 1998
Selecting the target year
Optimum Mix Design of Pavement Concrete Incorporating Fly-Ash
Yun, Kyong-Ku ; Lee, Joo-Hyung ; Jung, Young-Hwa ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 609~609
The most of highway in Korea have been paved by concrete since last ten years. The recycling of fly ash in pavement concrete may result in economics, the improvement of concrete qualify and the reservation of environment. This paper focused on the series of experiment and statistics analysis with experimental variables such as fly ash substitute ratio, water-cement ratio and maximum size of coarse aggregate in order to investigate the feasibility of recycling of fly ash in pavement concrete, to see the strength characteristics and to propose the optimum mix design based on the previous results. The results of experiments and analysis were follows; The substitute ratio of fly ash affected most seriously to the flexural strength of pavement concrete among main variables, followed by maximum size of coarse aggregate and water-cement ratio, Thus, attention should be shown in order to recycle the fly ash in pavement concrete which is designed and controled by flexural strength rather than compressive strength. The interaction between fly ash substitute ratio and coarse aggregate size was the biggest. The optimum mix design was determined by target compressive strength and flexural strength. The optimum mix design for highway pavement concrete with 32mm of maximum size of coarse aggregate and 45% of W/C could incorporate up to 5.0% and 2.5% of fly ash at
of target flexural strength, respectively. The optimum mix design for airport pavement concrete with 40mm of maximum size of coarse aggregate and 37% of W/C could incorporate up to 4.5% and 2.0% of fly ash at
of target flexural strength, respectively.
A Study on the Evaluation of Layer Properties of Flexible Pavement with Respect to Dynamic Effects of Falling Weight Deflectometer I : Development Backanalysis Procedure
Choi, Jun-Seong ; Lee, Seung-Hoon ; Kim, Soo-Il ; Yoo, Ji-Hyeun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 623~623
Most backcalculation programs used to evaluate pavement layer properties assume dynamic deflections as static deflections. This research aims to take into consideration the dynamic effects of the deflection basin from the Falling Weight Deflectometer(FWD) in the backcalculation procedure. Dynamic effects of FWD data were studied analytically and pseudo-static deflection factors were proposed. Pseudo-static deflection factors were derived from the regression analyses between the static and dynamic calculated deflection basins for three-layer systems with asphalt stabilized babe in asphalt concrete pavement. Bedrock thicknesses of 2m, 4m, 6m, and 20m were considered for analyses, Based on the results from the regression analyses, average relative error was found to be 2.2% between the psuedo-static deflections converted from dynamic deflections and static deflections. The algorithm in "Backanalysis of Asphalt Layer Modulus and Thickness" was modified to reflect the dynamic effects in the backcalculation process. A modified backcalculation procedure, DYN-BAL, was developed using the pseudo-static deflection factors. For the verification of a modified backcalculation procedure, DYN-BAL, numerical model tests were carried out. This paper (Part I) presents the pseudo-static backcalculation procedure, and a companion paper (Part II) presents the reliability of this approach in which the backcalculation procedure was verified using field and lab tests.
Evaluation of Rut and Fatigue Resistance of Selected Polymer-Modified Asphalt Concretes
Kim, Kwang-Woo ; Cho, Hee-Won ; Do, Young-Soo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 635~635
This study was carried out to evaluate resistance characteristics against both rutting and cracking of asphalt mixture that was made of polymer-modified asphalt binders. Asphalt binder used in this study was
, penetration grade of 85-100, and polymers for modifying asphalts were domestic LDPE (Low-density polyethylene) and SBS (Styrene-butadiene-styrene). Aggregates were a crushed gneiss and granite which were most widely used in the middle part of Korea. Using those materials, dense-graded asphalt mixtures were made based on Marshall mix design. Slab specimens were made and evaluated for rut resistance at
through wheel tracking test. Marshall specimen was used for tensile fatigue test in indirect tensile mode. As a result, polymer modified asphalt mixtures clearly showed an improved performance than normal mixtures did.
Development of an Algorithm for the Shrinkage-Expansion Corrections of the Cadastral Maps
Kim, Byung-Guk ; Kang, Tae-Seok ; Kim, Sang-Su ; Jeong, Dong-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 645~645
Current methods for correction of the expansion-shrinkage problem of the cadastral maps use the 4 corner points of the border lines as the control points for the transformation. Whereas, the new method proposed in this paper is using the grid points overlayed on the original cadastral maps. Thus this method makes the distortion be corrected locally. To test performance of the new method, a couple of sample cadastral data were generated, distorted and then corrected by the method. Then, the corrected data were compared to the originally generated data and the RMS error of
was obtained, which was within the error allowance for digital cadastral maps.
Analysis Of The Three Dimensional Position Using Digital Photogrammetry and GPS
Yeu, Bock-Mo ; Choi, Song-Wook ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 653~653
Recently, digital photogrammetry, three dimensional positioning using digital imagery, is researched lively. Also, GPS, positioning system using satellites, is acquired its utilities in many parts because it is very easy to get the three dimensional coordinates using GPS around the world. In this study, the program is developed for automatic process of digital photogrammetry and the VAN that has CCD cameras and GPS receivers onboard is built for mobile positioning system. Also, the three dimensional positioning toward 20 objects is done using left and right imagery of CCD cameras and GPS. For a base research in real-time photogrammetry, the three dimensional positioning is performed using continuous imagery and GPS and the three dimensional positioning accuracy is analyzed.
A Study on Improvement of Ground Reinforcement and Construction Method for Tunnel Cross-over the Han River - Concentrating on a Case Study on Small Falling of Rocks the riverbed Tunnel in the Han River -
Woo, Jong-Tae ; Yang, Tae-Seon ; Koo, Jai-Dong ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 669~669
Concentrating on small falling of rocks the riverbed tunnel in the Han River, it is studied on improvement of ground reinforcement and construction method. As the result, adit tunnel connected to main tunnel should be located under the good geological conditions instead of considering simple spacing prior to working road. The excavation of the adit tunnel under the poor geological conditions which is accumulated by blasting vibration demands the method to decrease the vibration effects. Also, under the same ground reinforcement conditions, the comparative study on mechanical excavation and blasting method should be performed, respectively.
Reliability-Based Analysis of Toppling Failure in Rock Slopes
Lee, Myung-Jae ; Lee, In-Mo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 679~679
This paper presents the results of sensitivity analysis performed on toppling failure of rock slopes to verify a newly developed reliability-based model considering uncertainties. The parameters that are needed for sensitivity analysis are the variability of discontinuity properties (orientation and strength of discontinuities), the loading conditions, and the rock slope geometry. The variability in orientation and friction angle of discontinuities, which can not be considered in the deterministic analysis, has a great influence on the rock slope stability. The stability of toppling failure in rock slopes is more influenced by the selection of dip direction of cutting rock face than any other design variables. The case study shows that the developed reliability-based toppling analysis model can reasonably assess the stability of rock slope.
Lubrication of Specimen Ends for Granular Materials in Element Tests
Park, Choon-Sik ; Jang, Jeong-Wook ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 689~689
In order to find the proper composition of lubrication layer to be used for element tests of granular materials in the laboratory, a series of direct shear tests between a granular material specimen and a lubrication layer was performed. The granular materials used ranged from a fine sand to a gravel with
. The lubrication layer consisted of a layer of silicone grease and a latex rubber disk, and its variations. Based on the test results the following points are shown : For Silver Leighton Buzzard Sand (
) and Hime Gravel (
), a proper amount of powder should be added to the original grease in order to improve the qualify of lubrication by preventing the squeezing out of grease from the places of stress concentration in the proximity of particles indenting the lubrication layer. At the same time, the amount of powder should not be too much in order not to increase the shear resistance of a mixture of grease and powder. Fly ash is suggested as a proper type of powder. By this method, even for Hime gravel, a low value of
of around 0.8 degrees at normal stress of
can be obtained.
A Study on the Variation of Soil Properties and Disturbance Effects with Sampling Methods
Lee, Yong-Gil ; Lee, Young-Nam ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 699~699
The effects on sampling distrubance to undrained shear strength and deformation characteristics of clay have been investigated using soil samples obtained from block sampling method and piston sampling method. Physical properties of clay soil studied were characterized using isotropic consolidation undrained triaxial test, eodometer test, soil index test and consistency test. The purpose of this study is to examine the differences of soil properties between block sample and piston sample in terms of sampling disturbance effects. The change of soil properties and degree of sample disturbance have been observed in terms of the volume change, stress-strain curve, the maximum shear strength, axial strain in failure and the elastic modulus of soil. Experimental investigation of the study indicated following facts. First, Piston sampling method gives a smaller void ratio than block sampling method under the same loading condition. Second, the sample disturbance degree could be quantified by comparing the consolidation curve and the volume change during consolidation under field effective stress. Third, the peak shear strength of block sampled soil was higher than that of piston sampled soil but axial strain in failure was vice verse, which means that sampling methods have a considerable effects on stress-strain behavior of soil.
Characteristic Study of Negative Skin Friction on Model Pile
Lee, Kyu-Hwan ; Shim, Min-Bo ; Yi, Chang-Tok ; Lee, Song ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 711~711
In many cases of founding structures on soft soil, pile foundation proves to be the only logical and economical choice. Current method of predicting negative skin friction along the pile shaft in clay could overpredict the estimated capacity. Therefore, understanding the nature and behavior of negative skin friction along the pile shaft is absolutely essential. This paper describes the measurement of negative skin friction on the model piles driven in the cylindrical chamber filled by remolded marine clay. The model pile was driven after around 90% consolidation of soft ground applied the load to induce settlement in the ground during the test. Three instrumented systems, load cells were installed on the model piles consisted of three parts to measure the negative skin friction forces independently. Pore pressures and ground movements in the ground were monitored throughout the period of investigation. The measured negative skin friction were also compared to the forces obtained from pull-out pile test. The results were analyzed and discussed in the paper.
A Study on the Backfill Loads on the Buried Metal-Polyethylene Composite Pipe(I) - In-situ test for the buried pipe and Finite Element Analysis -
Chung, Jin-Ho ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 725~725
The variations of the backfill loads acting on the metal-polyethylene composite pipes buried in various trenches backfilled afterward were investigated in this study. The reliability of the finite element analysis used in this study was examined by an in-situ test for the buried pipe. The backfill loads and deflections on the real-size pipe buried on-site were measured while increasing the backfill height. Further investigations were made for the variations of the backfill loads as a function of several important parameters such as backfill soil, backfill height(
), diameter of the pipe(
), and trench width(
). The backfill load appears to be greater for clayey sandy soil(SC) than silty sandy soil(SM) with increasing the pipe diameter for the given backfill height, and with incresing the backfill height for the given pipe daimeter. The backfill load with 90% of compaction degree is gloater than that with 85%.
A Study on the Backfill Loads on the Buried Metal-Polyethylene Composite Pipe(II) - Marston-Spangler's Theory -
Chung, Jin-Ho ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 741~741
We have studied the variation of the backfill load applied on a flexible pipe with trench width and backfill height for the cases of a narrow trench as well as a wide trench based on the theory of Marston-Spangler. Our conclusions from this study are summarized in the following. 1) The backfill load increases with increasing trench width but becomes invariant when trench width becomes greater than the transition width. The backfill height increases with increasing
but decreases with decreasing
. 2) The backfill load is independent of
for a narrow trench but increases with increasing
for a wide trench where the rate of increase also increases. 3) The optimum value of
for a metal-polyethylene composite pipe is found to be 0.0. 4) The backfill load increses with increasing backfill height as long as backfill width is less than the transition width when
= 0.0. The rate of increase however reduces for a trench whose width is greater than a certain value of transition width. 5) For a given transition width with
= 0.0, there exists a critical value of backfill height depending on the backfill materials(or on
) where a narrow trench can be formed.
Comparison of Single and Double Surface Work Hardening Models for Granular Soil
Kang, Byung-Sun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_5, 1998, Pages 759~759
Among various constitutive models proposed thus far in order to predict the behavior of granular soils with different stress paths, Lade's two models, one with a single yield surface and the other with two intersecting yield surfaces which have been evaluated to be of high applicability, are compared. As a series of stress path test results for granular soils showed that plastic deformation, let alone elastic one developed on yield surface and the direction of stress had an influence on the direction of plastic deformation increment. Lade's double surface work-hardening model presented better accordence to test results than single surface one. Also the behavior of actual foundation was more accurately by double surface model.