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Evi Aprianti
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International Association of Lowland Technology In Collaboration with Hasanuddin University and Saga University Address Faculty of Engineering, Center of Technology Building, 1st Floor Jalan Poros Malino km. 6, Bontomarannu, Gowa Indonesia Postal Code: 91711
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Lowland Technology International
Published by International Association of Lowland Technology
ISSN : 13449656     EISSN : 21878870     DOI : https://doi.org/10.0001/ialt_lti
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Transportation
The Lowland Technology International Journal presents activity and research developments in Geotechnical Engineering, Water Resources Engineering, Structural Engineering, Transportation Engineering, Urban Planning, Coastal Engineering, Disaster Prevention and Mitigation Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 5 Documents
 1 
Search results for , issue "Vol 12 No 2, Dec (2010)" : 5 Documents clear
EVALUATING STABILITY OF RIVERBANKS REINFORCED WITH ROCKFILL COLUMNS W. F. Abdulrazaq; M. C. Alfaro; J. A. Blatz
Lowland Technology International Vol 12 No 2, Dec (2010)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents the results of stability analysis of natural and stabilized riverbanks. Limit Equilibrium Method (LEM) and Finite Element Method (FEM) were used in the analysis. In the FEM, two approaches were employed: 1) combined LEM and FEM, and 2) FEM with the shear strength reduction (SSR) technique. The limit equilibrium method and the finite element method of stability analysis produced similar calculated factor of safety values. This provides confidence that either method estimates similar factor of safety values for natural and stabilized riverbanks. Based on the FEM analysis, it was shown that the centre-to-centre spacing between columns plays a major role in increasing the factor of safety. The calculated maximum shear strain in the stabilized riverbanks is reduced with a closer spacing rows. This is important since lesser slope displacements are required to mobilize the necessary shear resistance for closer rockfill column spacing.
MECHANICAL BEHAVIOR OF CRUSHED ROCK BASE (CRB) UNDER REPEATED LOADS K. Siripun; P. Jitsangiam; H. Nikraz
Lowland Technology International Vol 12 No 2, Dec (2010)
Publisher : International Association of Lowland Technology

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Abstract

This paper aims to report the mechanical behavior of a crushed rock base (CRB) subjected to repeated loads from Repeated Loads Triaxial (RLT) test with various stress paths in order to improve more understanding of roads based materials on mechanistic-empirical pavement design and analysis. As is well known, pavement suface rutiing, longitudinal and alligator cracks are normally the main cause of damage in flexible pavements. Factors contributing to such damage are the excessive irreversible and reversible deformation of a base layer including the behavior of a mechanical response of CRB under traffic load is not well understood. In this study, the shakedown concept was utilized to describe and determine limited use of CRB subjected to different stress condition defined by the stress ratio (the ratio of vertical major stress, σ1 and a horizontal minor stress, σ3) in order to simulate the real condition of pavement. The study reports that CRB was defined the working stress ratio of 11 in pavement structure and will show rutting deterioration at the large number of load cycles after a stable state. Moreover, the mechanical responses were investigated and limit ranges of using CRB in pavements were determined.
PHOSPHORUS RECOVERY FROM WASTEWATER BY HYDROTALCITE AND ZEOLITE Y. Mishima; H. Araki
Lowland Technology International Vol 12 No 2, Dec (2010)
Publisher : International Association of Lowland Technology

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Abstract

A system using hydrotalcite and zeolite is developed for the recovery of phosphorus from wastewater having low phospate concetrations. As HT and Ze is independently used, redundant ion species are produced in a desorbing solution. As HT and Ze are used in combination, however, the opposite redundant ion species can be used to desorb PO43- and NH4+, respectively. Simply alkaline NaCl solution is used to desorb/regenerate HT/Ze. Moreover, desorbed substances can be recovered as magnesium ammonium phosphate (MAP) by the addition of Mg. In this paper, the desorption of PO43- and NH4+ from HT and Ze into a single desorbing solution and phosphorus recovery from the desorbing solutions as MAP are experimentally investigated. It is verified that the single desorbing solution can simultaneously desorb HT and Ze. Whereas 95% of phosphate was recovered from the desorbing soluition in which PO43- and NH4+ were accumulated, most of the recovered phosphorus was not MAP but Mg3(PO4)2 (MP). However, when the initial concentrations of PO43- and NH4+ in the desorbing solution increased, MAP was procuded rather easily and more than 90% of P was recovered. Further investigation into application for the practical plant is necessary.
REASONABLE MANAGEMENT INDEX IN FILL LOADING WITH VACUUM CONSOLIDATION METHOD BASED ON FEM ANALYSES M. Shahiduzzaman; Y. Tanabashi; H. Kawabata; Y. Jiang; S. Sugimoto
Lowland Technology International Vol 12 No 2, Dec (2010)
Publisher : International Association of Lowland Technology

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Abstract

Vacuum consolidation method (VCM) is one of the recent methods being utilized for the improvement of soft ground. This method can forcibly drain pore water, and increase ground strength by loading with vacuum pressure. A fill loading with vacuum consolidation method (FLVCM) is reported to be able to control lateral displacement and upheaval of the surrounding area during rapid fill loading. However, the behavior of this combination of benefits on ground deformation is not fully clarified within FLVCM. Fill design and site management depends on experience with the technique. In this study, numerical simulation has been carried out by finite element method (FEM) for the quantitative evaluation of the deformation suppression effect of FLVCM on the soft grounds of Ariake clay in Japan. The utility of FLVCM was confirmed by comparison of observed and analytical ground deformation. In addition, numerical simulations have been carried out under various conditions of vacuum pre- and post-loading pressures and fill speeds. It looks as though a reasonable management index can be easily obtained by site measurement of deformation.
THERMAL ENVIRONMENT OF TIDAL MUD OF ARIAKE SEA M. A. Moqsud; S. Hayashi; D. Suetsugu; Q. S. Bushra
Lowland Technology International Vol 12 No 2, Dec (2010)
Publisher : International Association of Lowland Technology

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Abstract

A remarkable decrease of catch of shells was observed during the last three decades in the Ariake Sea, Japan. The higher content of acid volatile sulfide (AVS) is responsible for the unfavorable geo-environmental condition of the Ariake Sea. This paper presents an assessment of the thermal environment of the Ariake Sea tidal flat as a part of geo-environmental condition study. To observe the daily and seasonal variation of temperature in different depths, temperature was measured by inserting the thermocouple at various specified depths and at 0.10 m depths interval in the last week of every month at study areas in the Ariake Sea tidal flat, respectively. Thermal properties of the sea mud were measured by using the thermal properties analyzer (KD2). It was observed that during the spring and summer heat was transferred from subsurface to the deeper depth however during winter, and autumn the opposite phenomena happened. This type of temperature profile in the tidal flat helps to enter the sea laver treatment medicine during winter and consequently deteriorate the mud and again helped to increase remediation of the Ariake sea tidal mud naturally during summer.

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