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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 17, Issue 3_6 - Nov 1997
Volume 17, Issue 2_6 - Nov 1997
Volume 17, Issue 1_6 - Nov 1997
Volume 17, Issue 3_5 - Sep 1997
Volume 17, Issue 2_5 - Sep 1997
Volume 17, Issue 1_5 - Sep 1997
Volume 17, Issue 3_4 - Jul 1997
Volume 17, Issue 2_4 - Jul 1997
Volume 17, Issue 1_4 - Jul 1997
Volume 17, Issue 3_3 - May 1997
Volume 17, Issue 2_3 - May 1997
Volume 17, Issue 1_3 - May 1997
Volume 17, Issue 3_2 - Mar 1997
Volume 17, Issue 2_2 - Mar 1997
Volume 17, Issue 1_2 - Mar 1997
Volume 17, Issue 3_1 - Jan 1997
Volume 17, Issue 2_1 - Jan 1997
Volume 17, Issue 1_1 - Jan 1997
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Correlation analysis on the Marshall Properties and Resilient Modulus of Asphalt Concrete Mixture
Lee, Kyong-Ha ; Lee, Kwang-Ho ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_5, 1997, Pages 495~495
Resilient modulus is a physical property which represents the characteristics of pavement system subject to cyclic loading. In '86 AASHTO guide, resilient modulus was adapted as main input variable of pavement thickness design. In this study, resilient modulus test, Marshall stability test and indirect tensile strength test were performed on the asphalt concrete specimen made of 4 types of aggregate from different regions. Resilient characteristics were analyzed and typical value of resilient moduli of domestic asphalt concrete were determinated. Resilient modulus test results show that density. VFA, void and VMA are affecting to resilient modulus, and density is the most important factor among them. Marshall stability and indirect tensile strength are proportional to resilient modulus and Marshall stability is more significant than indirect tensile strength. The range of resilient modulus at 95% confidence level in domestic asphalt concrete is
at surface course, and
at asphalt treated base.
Determination of the Relationship Between Mixture Characteristics and Moisture-Induced Property Changes of Asphalt Mixtures
Kim, Nam-Ho ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_5, 1997, Pages 505~505
The effects of moisture were evaluated by determining the fundamental low temperature properties of field cores from the 22 field test sections at two different levels of moisture: consequently, it was found that changes in moisture within asphalt concrete mixtures may affect fundamental low temperature properties even when the moisture changes do not affect the integrity of the mixture. An attempt was made to explain the changes in physical properties induced by moisture in terms of fundamental characteristics of the mixture. The effect of moisture changes appears to depend on the following: mixture type, particularly as defined by pore volume and pore structure characteristics: the degree of saturation of the pores: and whether or not the pore water is frozen.
Evaluation of Resilient Modulus and Indirect Tensile Strength with Different Compaction Methods
Lee, Kwan-Ho ; Park, Tae-Soon ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_5, 1997, Pages 521~521
A lot of laboratory tests have been used to determine the mechanical properties of asphalt mixtures. As the most widely used compaction method, the Marshall compactor has been employed to fabricate asphalt mixtures. However, the compaction method adopted in the Marshall method is somewhat different to the compaction in fields which is simulated by kneading action. The difference of compaction method can affect on evaluation of the performance of asphalt mixture in the laboratory. In this study, the Marshall compactor and the Gyratory compactor were used to fabricate asphalt mixtures to investigate the effect of the different compaction method. The two mechanical tests, the resilient modulus test and the indirect tensile test, were carried out. At low temperature (
), the resilient modulus (
) of the gyratory compacted specimen shows higher than that of the Marshall compacted specimen in the both grade of asphalt mixtures. However, at high temperature (
of the Marshall compacted specimen is higher than that of the gyratory compacted specimen. In AC-10 asphalt specimens, the tensile strength for the gyratory compaction is slightly higher than for the Marshall compaction. However, the change of tensile strength is not significant for AC-20 asphalt specimen with both compaction.
A Study on the Elasto-plastic Analysis of Grout-reinforced Tunnel
Lee, Jun-Seok ; Bang, Chun-Seok ; Yeom, Ju-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_5, 1997, Pages 531~531
Grouting technique is widely used when in-situ geologic condition of the tunnel alignment is relatively poor or the thickness above the tunnel is not thick enough to form an arching effect. However, mechanical behavior of the grout-reinforced tunnel is not fully understood so far and, therefore, engineering rule-of-thumb is commonly applied during designing procedure. In this paper, an elasto-plastic analysis of the composite material, in which in-situ soil and grouting materials are assumed to be scattered in regular pattern. is performed to obtain more accurate mechanical behavior of the grout-reinforced tunnel. The proposed model is developed by considering yield functions of the constituent materials at the same time and verified by employing 3-dimensional finite element analysis of the footing structure involving grout-reinforcement within in-situ soil. Also, through elasto-plastic analysis of the grout-reinforced tunnel, it is proved that the homogenization technique adopted in this study can be applied to both elastic and elasto-plastic range of the material behavior. The proposed model is expected to applied to design of the ground improvement technique directly and future work will be concentrated on the parametric studies of the material characteristics and geometry of the grout as well as in-situ soil.
Applicability of Cross-shaped Mandrels to Vertical Drain Soil Improvement Method
Kang, Min-Soo ; Kim, Soo-Sam ; Jang, Yeon-Soo ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_5, 1997, Pages 541~541
Laboratory smear zone tests are performed with various model mandrels including cross shaped mandrels and the range of smear zones are evaluated. Efficiency of various shaped mandrels is analyzed using the Barron's and Hansbo's analytic solutions of consolidation for consolidation time of plastic drain boards with respect to the relative distance of PDBs and drainage depth of clay. It was recognized from the test results that the cross shaped mandrels can reduce the smear effect to minimum and maximize the discharge capacity. Differences in consolidation time between the two analytic solutions were significant. This means that the analytic solution which can account for the smear and well resistance effect should be used to design the spacing of PDBs for improving weak clays.
The Stability of Landfill Liner Systems on A Side Slope
Lee, Kwang-Yeol ; Kim, Soo-Seok ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_5, 1997, Pages 549~549
In this study, theoretical analysis of stability of liner systems in a side slope are presented considering the interface frictions and height of waste piles, the shear force acting on a side slope of liner systems is determined utilizing a height of waste piles and an interface friction between liner materials. Also, a variation of required strength of liner materials is presented depend upon the interface friction and height of waste piles. In this research, the results showed that the required tensil strength of liner materials exponentially increases as increase of a hight of embankment, that shear force acting on liner systems for incineration ashes are greater than that for municipal wastes. It is proved that the liner system installing geosnthetics above the geomembrane(HDPE) underling compacted clays is the most effective for stability against tensil failures on a side slope.
The Effect of Principal Stress Rotation in Torsion Shear Test on Sand
Nam, Jung-Man ; Hong, Won-Pyo ; Yun, Jung-Mann ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_5, 1997, Pages 557~557
A series of torsion shear tests were performed on the Santa Monica Beach Sand to investigate the effect of rotation of principal stress axes, which was able to apply independently vertical stresses, confined pressure and torque, respectively. From results of torsion shear tests, it was found that the direction of plastic strain incremental vector at failure coincided with the stress vector in physical stress space and showed a good agreement with nonassociate flow rule in work-space. Also, the directions of strain increment along stress path essentially coincided with the directions of major principal stress increment at small stress levels or in the early stage of tests, but as the stage of stress path approached to failure point, it showed typical isotropic plastic behavior that the directions of strain increment were gradually changed to coincide with the direction of the major principal stress.
An Analysis on the Behaviour of Stress-Strain Relation of Decomposed Granite Soil Using Single Work Hardenning Constitutive Model by Lade
Shin, Bang-Woong ; Lee, Kwang-Dong ; Oh, Se-Wook ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_5, 1997, Pages 565~565
This paper aimed at predicting the behaviour of stress-strain relation of decomposed granite soil using single work hardening constitutive model by Lade. Sample soil is weathered granite soil that be founded at Cheongju district. To determine soil parameters, isotropic consolidation tests and cylinderical triaxial compression tests are performed. at this time the compaction energy of 95% on the laboratory testing was maintained in order to regulate fracture effect by virtue of the compaction. Basic physical properties is determined by geotechnical tests, and for application single work hardenning constitutive model, the soil parameters (11) needed in this model were determined. Prediction of stress-strain relation by FEM program of this model were compared with results of laboratory testing.
Bearing Capacity of Strip Footing on Geogrid-Reinforced Slope
Yoo, Chung-Sik ; Lee, Dae-Young ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_5, 1997, Pages 579~579
This paper presents the results of laboratory model footing tests on the bearing capacity behavior of strip footing on geogrid reinforced slopes. For the model tests, the reinforced slopes were artificially created using the raining technique with sand. A wide range of conditions were analyzed by varying geogrid reinforcing patterns. Furthermore, model tests were simulated using finite element analysis with the aim of investigating the mechanics behavior of the reinforced slope such as failure mechanism and force distribution in geogrid. Based on the results of model tests, both qualitative and quantitative relationships were established between the bearing capacity and the geogrid design parameters such as depth, length, and number of layers. In addition, optimum reinforcing patterns were suggested for the slopes reinforced with single, double, and triple geogrid layers.
Soil Improvement by Quick Lime Mixing
Chun, Byung-Sik ; Kim, Soo-Sam ; Koh, Kyung-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 3_5, 1997, Pages 589~589
The quick lime mixing method, one of the ground improvement techniques, improves ground because quick lime expands. decreases water contents, thermogenesis and hardens soft ground by chemical interaction between soil minerals and quick lime while quick lime changes into slaked lime and through this research it was certificated that soil was improved while quick lime changes into slaked lime and by pozzolan reaction the strength of soil was increased. The two types of improvement of ground by lime mixing are shallow mixing and deep mixing methods. In this study. shallow lime mixing method was performed. For this analysis. the mechanism of reaction between quick lime and ground is analyzed and specific gravity, grain size, chemical components of quick lime are analyzed by the laboratory test. Also, the properties of the ground mixed with quick lime such as strength, degree of compaction, temperature at slaking reaction, decrease of water contents, and the result of SEM and X-Ray diffraction are analysed from the laboratory test.