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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 6 Documents
 1 
Search results for , issue "Vol 18 No 4, March (2017)" : 6 Documents clear
Effectiveness of slurry wall for lead retention in contaminated soil C. Teerawattanasuk; P. Voottipruex
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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Abstract

This paper examines the hydraulic conductivity and strength properties of several bentonite�cement (BC) mixtures and to delineate the influence of the cementitious material content, bentonite, and curing time upon the strength and hydraulic conductivity of BC barrier materials. The two ratios of cementitious material to bentonite-water slurry used were 7.5%, and 15%. Samples were cured for a period of 7, 14 and 28 days at 100% humidity, after which samples of each mixture underwent permeability and unconfined compression testing. It can be seen that unconfined compressive strength (qu) of specimen increased as cement content increased due to the hydration products. However, the qu of specimen decreased as bentonite content increased due to high expansion. Specimens with high cement content form a low permeability material that keeps high lead contaminant in top and middle portion in the specimen. The results shows that qu increase as cement content and curing period increase while the permeability coefficient decrease as curing period and cement content increase. Moreover, the effectiveness of slurry wall for lead retention contaminated soil can be obtained by using the optimum bentonite-cement proportion of B10C15.
Trichloroethylene-alcohol-water solubility characteristics with implications for partitioning tracer tests at DNAPL contaminated sites A. Putthividhya; K. Manajit
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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Abstract

Dense nonaqueous phase liquids (DNAPLs) widely occurred at numerous subsurface sites can act as long-term sources of both vapor-phase and groundwater contamination. Successful remediation and effective risk assessment of DNAPLcontaminated sites is limited by current source zone characterization techniques and DNAPL unique behavior. A relatively new method of DNAPL-contaminated site characterization involved the use of partitioning tracers to provide estimates of the known amount of DNAPL. A new practical continuous flow system was developed in this work to explore the DNAPL’s partitioning tracer-water solubility characteristics under pure phase and selected cosolvents conditions which can be crucial for estimate retardation factors of various tracers with implications for partitioning tracer tests at DNAPL-contaminated sites. Trichloroethylene (TCE) was selected as a representative of DNAPL due to its unique properties and solvent effects. Bromide was employed as a non-partitioning tracer, while three alcohols (i.e., iso-propanol, methanol, and ethanol) effluents were determined as a function of time under pure solvent and 30% cosolvent additions. The three alcohols appeared to have been used successfully as a partitioning tracers for detection of potential DNAPL saturation. Moment analysis of breakthrough curves allowed TCE and alcohol mass recovery and retardation factor calculation, and therefore could further estimate apparent DNAPL saturation. Assuming that partitioning to TCE-DNAPL is the only mechanism for retention of alcohols in the system, flow rate and various alcohol fraction additions seemed to have no major influence on retardation factor estimation of partitioning tracers in the system.
Research on indicator system and carbon emissions of lowcarbon eco-city - A case study in Hangzhou, China J. Ge; M.Y. Lu; J. Lu; X.Y. Luo; Y. Zhu
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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Abstract

Based on an extensive review of 31 international and domestic indicator systems, a system, which consists of 6 primary categories, 19 secondary categories, and 39 indicators is proposed for Transfer Science and Technical Park in Hangzhou city, covering sustainable development in environment, urban space and green building, transportation, energy and resource, governance and infrastructure, and economy aspects. Then all indicators are classified into three implementation stages (e.g. regional control indicators, park management indicators, and block control indicators) to ensure the fully accomplishment of low-carbon targets, which are always neglected by researchers, planners, governments and city managers. In the end, two scenarios are adopted, while the former is developing in traditional way and the latter is under the circumstance that all indicators are accomplished, to calculate the carbon reduction in order to quantitatively evaluate the effect of the indicator system. The results reveal that the policy makers should give the priority to indicators related to green buildings (e.g. ratio of green buildings), utilization of renewable energy, green transportation (e.g. mixed land use, green travel, green vehicles, etc.), greenery (green coverage ratio, multi-coat landscaping planting system etc.) while establishing policies and guidance towards a low-carbon eco-city.
Effects of surface geology and topography on the damage severity during the 2015 Nepal Gorkha earthquake K. Sharma; M. Subedi; R.R. Parajuli; B. Pokharel
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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Abstract

An earthquake of moment magnitude (Mw) 7.8 struck Nepal at 06:11 UTC on April 25, 2015. A field reconnaissance was carried out immediately after the main shock. This paper presents the accelerograms and the geology of Nepal. The acceleration response spectra of the motions at the valley show a prominent amplification at the period of 5 sec. This paper describes the effects of local geology and topography on the damage severity during the earthquake. The damage patterns illustrate the strong influence of local geology conditions on the severity of the damage at many places, like soil amplification in Gongabu, Machhapokhari, Ramkot, Purano Naikap, areas along the major rivers in Kathmandu Valley with loose alluvium deposits, and ridge effects on the Swayambhu Nath hill and Chautara. The effect of low frequency amplification caused by the Kathmandu Valley basin is evident from the severe damage to well-designed tall buildings in Kathmandu. Severe damages including ground fissures and liquefactions were observed adjacent to basin edges around the Kathmandu Valley. It was concluded on the basis of the observation that local geology, rather than engineering features of structures, largely determined the severity of damage during the earthquake.
Geomorphic approach of controlling mass movements on Tama Koshi road in Central Nepal M.R. Dhital
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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Abstract

The heavy monsoonal precipitation of 2012 in central Nepal triggered off or reactivated many mass movements on the Tama Koshi road. A site survey of unstable grounds was carried out to recommend short- and long-term control measures. The landslide control works were recommended mainly on the basis of detailed geomorphic mapping supplemented with some geotechnical investigation of soils, and most of these structures are working satisfactorily.
Strains induced around cutoff walls of earth dam under full reservoir and drawdown conditions S.S. Athani; C.H. Solanki; B.G. Mohapatra; G.R. Dodagoudar
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents the study pertaining to the strains that are developed near the cutoff walls employed in the foundation medium of the dam section. A total of sixteen finite element simulations are considered in the study, where the combination and placement of the cutoff walls in the foundation medium are varied. A cutoff wall is made to act as a seepage barrier with assigned linear elastic properties. A hypothetical earth dam of height 35 m is provided with a slope of 1V: 2.5H for both the downstream and the upstream sides. The finite element analyses are carried out using PLAXIS – 3D to obtain the principal strains and their variation with respect to time for two different conditions viz. Full reservoir steady seepage and Drawdown conditions. The variations in strains in the dam section and in the foundation medium are found to be more predominant for the two barriers with increased Young’s modulus having a spacing of 15 m, first one being located at 0 m and second at 15 m from the center of the dam. The excessive strains would initiate cracks in the cutoff walls. This fact has to be taken to advantage while finalizing the sections for the cutoff walls.

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