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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 16, Issue 3_6 - Nov 1996
Volume 16, Issue 2_6 - Nov 1996
Volume 16, Issue 1_6 - Nov 1996
Volume 16, Issue 3_5 - Sep 1996
Volume 16, Issue 2_5 - Sep 1996
Volume 16, Issue 1_5 - Sep 1996
Volume 16, Issue 3_4 - Jul 1996
Volume 16, Issue 2_4 - Jul 1996
Volume 16, Issue 1_4 - Jul 1996
Volume 16, Issue 3_3 - May 1996
Volume 16, Issue 2_3 - May 1996
Volume 16, Issue 1_3 - May 1996
Volume 16, Issue 3_2 - Mar 1996
Volume 16, Issue 2_2 - Mar 1996
Volume 16, Issue 1_2 - Mar 1996
Volume 16, Issue 3_1 - Jan 1996
Volume 16, Issue 2_1 - Jan 1996
Volume 16, Issue 1_1 - Jan 1996
Selecting the target year
Pyrolized Carbon Black from Scrap Tires as a Reinforcing Agent for Hot Mix Asphalt
Park, Tae-Soon ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_4, 1996, Pages 313~313
The main objective of this study is to evaluate the viability of using Pyrolized Carbon Black (CBp) derived from waste tires as a reinforcing agent in asphalt mixtures. Commercial Carbon Black (CB) has been previously shown to reduce the rutting resistance, the temperature susceptibility and the cracking propagation potential of asphalt concrete. It was believed that CBp could produce similar benefits, and this laboratory study has shown that such is the case. Different ratios of CBp and CB (5%, 10%, 15% 20% by weight of asphalt) were blended with two grades of asphalt (AC-10 and AC-20) . The Marshall method. the Gyratory Testing Machine, the Dynamic Creep Testing (Confined), the Indirect Tensile Testing and the Resilient Modulus Test were performed The test results were compared to the CB mixtures and the conventional mixtures. The analyses of test results show that the typical performance of CBp modified asphalt mixtures is improved with respect to commercial carbon black and conventional asphalt mixtures. The rutting potential, and the temperature susceptibility can be reduced by the inclusion of CBp in the asphalt mixture. A pyrolized carbon black content of 10% to 15% by weight of asphalt is recommended for the improvement of asphalt concrete.
A Study on Property Changes of Asphalt Mixture Induced by Moisture - Based on Experimental Investigation of Indirect Tensile Creep Test at Low Temperature -
Kim, Nam-Ho ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_4, 1996, Pages 323~323
This study evaluated the effects of moisture on low-temperature asphalt mixture properties by determining the fundamental low temperature properties of field cores from the 22 field test sections at two different levels of moisture. The goal was to get an indication of how much these properties may have changed in service. The idea was to introduce moisture into the mixtures without causing significant breakdown of the mixtures due to stripping or disintegration. The indirect tensile creep and failure test at low temperature (ITLT), which was selected by SHRP to support the mixture specification for thermal cracking, was performed on field cores at two temperatures and two levels of moisture. Master compliance curves and fracture properties were generated and compared to evaluate the changes in fundamental low temperature properties at two different levels of moisture. The key finding from this work was that changes in moisture condition within asphalt mixtures had a significant effect on the low temperature properties of asphalt mixtures. These changes in property have proven to have a significant effect on the thermal cracking performance of asphalt pavements (Kim, 1994). The changes in properties and performance occur even when moisture does not damage the mixture significantly. This research finding may indicate the mixture property determined by the current testing system for field cores that does not consider the moisture-induced property changes may not be a true representation of in-situ property of asphalt mixture in fold.
Automatic Acquisition of Topographic Informations for Geospatial Information System Using the Digital Photogrammetry
Yoo, Hwan-Hee ; Cho, Hae-Yong ; Song, Young-Sun ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_4, 1996, Pages 335~335
Digital photogrammetry is concerned with capturing, processing and analyzing digital images. Ultimately, the goal is to automatically produce photogrammetric products, such as a digital map which may form the database for a Geospatial Information System. In this paper, we present an overview of the system for topographic information acquisition which was developed to do DEM and digital orthophotos generation, as well as 3D animations and could suggest the following results. First, the digital photogrammetric S/W was developed to be used for DEM and digital orthophotos generation, extraction of 3D coordinates of road and building edges using the digital images captured by video cameras. Second, in order to do the overlap of digital orthophotos and edges of road and building, the 3D perspective view, as well as the 3D animation, we suggested the mapping system which was linked digital photogrammetric S/W and AutoCAD/3D STUDIO by an AutoLISP program. The mapping system, which we developed, is expected to be used to get topographic informations in general planning for construction work and landscape architecture.
Deformation Monitoring of a Structure Using a Vision Metrology System
Lee, Jin-Duk ; Fraser, Clive S. ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_4, 1996, Pages 343~343
The recent appearance of still video cameras has given a further boost to single sensor vision metrology system development. These cameras, which incorporate on-board image storage, offer the flexibility of a film-based camera because the on-line link to an external computer is no longer required when capturing images. This paper reports on a test measurement carried out to ascertain the suitability of vision metrology approach for monitoring the deformation of a concrete silo support structure. It is ascertained that still-video imagery, coupled with digital image mensuration and restitution techniques, offers a 3-D measurement tool which is well suited to deformation monitoring in close range engineering and industrial applications. This project demonstrates the high accuracy potential which exceed 1:120.000 and operational flexibility of the vision metrology approach.
Data Processing of Vibration Records and Its Application
Paik, Young-Shik ; Mok, Young-Jin ; Lee, Seok-Jin ; Lee, Yong-Bum ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_4, 1996, Pages 351~351
A new method to generate one type of vibration measure from another, among three types (particle acceleration, particle velocity, and displacement), was developed by using Fourier transform and a digital filter. Monitoring dynamic displacements directly by using displacement sensors (ex: LVDT) is very formidable because of their limited tracking capability of high-frequency vibration. However dynamic displacement records can be in directly generated by applying the new method to measured acceleration or velocity records. The applicability of the method was successfully demonstrated at a blasting site. Also, a new method of vibration evaluation was presented in terms of displacements calcuated from acceleration records.
A Comparative Study on Slope Stability of Analysis Methods
Lee, Chong-Kyu ; Chang, Seo-Man ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_4, 1996, Pages 359~359
In practice, general limit equilibrium methods are used in the analysis of slope stability because of its relative simplification. The actual failure surface based on limit equilibrium method, however, hardly coincide with the analytical values, and neither consider the settlement of slope, nor recognize stress concentration during failure. On the otherhand, the advantage of the finite difference method consist in its facility to take into account settlement of slope, stress concentration and anisotropy of the materials. Four failure site data and two types of hypothetical slopes with 10 different slope angles are analysed, and the results of two analytical methods are compared. The safety factor and failure mode based on two analytical methods show that the above results are similar in the cases of failure sites and unstable slopes cases. In the cases of the relatively stable slopes, however, the results of limit equilibrium method are higher value of safety factor than those of finite difference method. And it is believed that the finite difference method can provide much significant information about the slope behaviour on the prefailure stress-strain mechanism.
Coupling Effect between Stresses and Strains in Soil Behavior
Hong, Won-Pyo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_4, 1996, Pages 369~369
The coupling effect between stresses and strains in soils, in which axial stress and shear stress were applied, could be observed in torsion shear tests on clay and sand. A coupling effect between shear stress and axial strain has been developed when shear stress was applied while the axial stress was held essentially constant. A similar coupling effect between shear strain and axial stress has been developed in tests in which shear stress was applied and held constant and the axial stress was varied. These coupling effects between stresses and strains cannot be predicted by theory of elasticity because the coupling effect is one of the typical behavior of plastic materials. The predicted response by the isotropic single-hardening constitutive model shows the coupling effect as the same as the results of experiments on clay and sand. Thus the model based on elasto-plastic theory can explain the coupling effect in soil behavior during reorientation of principal stresses.