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Evi Aprianti
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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 463 Documents
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Improvement of Soft Bangkok Clay using Kaolin-Quick Lime Geopolymer Suman Manandhar; Panich Voottipruex; Siripat Maneekaew; Chairat Teerawattnasuk; Ittipon Meepon
Lowland Technology International Vol 22 No 3 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i3, Dec.734

Abstract

The engineering properties of C-QG geopolymer were evaluated to ascertain the viability of using this material as an embankment structure fill material and also the efficacy of geopolymer stabilization in improving mechanical behavior of soft clay. Results from strength assessments with the usage of UCS and indirect tensile strength were used to establish the performance of the C-QG geopolymer. Quicklime mixed with 6 molar NaOH gave the maximum unconfined compressive strength. qu of the samples increases significantly to 127% as the temperature increase from 28 °C to 70 °C indicating that the optimum curing temperature was 70 °C. Elastic modulus of samples increases with curing temperature increase. The mixing ratio of C:QG 60:40 exhibited highest elastic modulus. E50 increases with increasing in geopolymer content and approximately equal to 869.82qu. This secant modulus can be used for pavement design in Thailand. The highest indirect strength at all curing temperatures was obtained samples with mixing ratio of C:QG 80:20. The curing temperature increased from 28 °C to 70 °C, the indirect tensile strength increased by 50 percent indicating that the optimal curing temperature is 70 °C. The strength development from the UCS tests demonstrates the binding properties of the QG geopolymers. At curing temperature of 70 °C, the sample exhibit more particle arrangement than the sample curing under 70 °C . It can be anticipated that the curing temperature of 70 degrees is suitable for polymerization reaction.
Optimisation of Geotechnical Properties of Spent Ore for Road Construction in Ghana BERNARD OFOSU; Micheal Affam; Farouk Omar Uman; Vincent Acquah Bondzie
Lowland Technology International Vol 22 No 4 (2021): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i4.741

Abstract

Mining operations generate large volume of wastes (spent ore) and due to its potential toxic nature, it is managed in accordance to very strict environmental regulations in Ghana. The spent ore can be reutilized as a construction material especially for road, however, due to its granular nature, it is not possible to compact the materials to achieve the required strength for engineering purposes. Laterite which is abundantly found in Ghana was used to improve the engineering properties of spent ore for road base and subbase construction. The laterite was added to the spent ore in range of 10% to 50% to form composites. Physical and engineering laboratory tests including moisture content, Atterberg Limits, compaction and Californian Bearing Ratio were conducted on the composites in accordance with British Standards. The results show that the Liquid Limit of the composites are between 18.7% and 30%, the Plasticity Index are between 1.3% and 11.3%. The soaked CBR values are between 32% and 62%, the unsoaked values are between 31% and 64%. The results show that, 30% addition of the laterite will improve the spent ore for only subbase construction based on Ghana Highway Authority standards for base and subbase materials in Ghana.
Motorcycle accident model for highlands regions by applying Generaliazed Linear Model (GLM) Sobri Abusini; L Ambarwati
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v20i3, Dec.747

Abstract

Motorcyclists are the major victims in highway accidents due to instability of motorcycle vehicle and driver behavior. Currently, insufficient studies related to motorcycles accident model considering road geometry and traffic characteristics in highland regions were conducted. This study carried out the investigation on crashes involving motorcycle, development of motorcycle accident model for highland regions of Malang City, East Java Province as a case study. The research analysis employed the Generalized Linear Model (GLM). The model was developed by using accidents data from Police Department and investigation of traffic and road geometry as black spots. On ten road sections investigated and distributed questionnaires to 100 respondents, the respondents experience 1-2 times accidents with light injuries (26%) and serious injuries (11%), and no injury (3%). Accidents occur at noon (11%) and afternoon (13%) and due to their own fault and crashing with other motorcycle (27%). The results are found out that motorcycle accident model influenced by traffic factors, i.e. flow and speed and also road geometric factors, i.e. lane width (LW), shoulder width (SW), number of lanes (NL), number of access roads (NA) and walkway width (WW).
Effect of Diameter, Root Moisture Content, Gauge Length and Loading Rate on Tensile Strength of Plant Roots and Their Contribution to Slope Stability Damtew Tsige Melese
Lowland Technology International Vol 22 No 4 (2021): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i4.749

Abstract

Root tensile strength is a crucial parameter for enhancement of soil shear resistance against failure. Mechanical stabilization of plant roots depends on the tensile strength properties of roots, friction properties, and root density and its network. The aim of the study is therefore, to conduct combined effect of various influential factors (diameter of the root, specimen length, testing speed, and root moisture variation) on the root tensile strength properties of plant roots. The root system of five selected plant species are studied. Intact and undamaged root specimens sampled and tested for root characteristics and tensile strength (Tr) at different root moisture content with different diameter classes. The result of the study further revealed that (a) testing speed has insignificant influence on plant root tensile strength (b) specimen length and plant root tensile strength showed a significant negative linear correlation (c) root diameter and tensile strength showed negative power function correlation (d) root moisture content had slightly negative correlation with root tensile strength. From five tested plant species, the highest tensile strength recorded in Salix subserrata followed by Eucalyptus globules. Therefore, Salix subserrata is a promising species for slope stabilization because of its root mechanical characteristics.
Analysis and Graphical Expression of Vitality Spatial Planning for a Lowland Healthy Campus Community J.R SHI; X.M. Zhao; Y.Y. Zhang
Lowland Technology International Vol 22 No 4 (2021): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i4.752

Abstract

ABSTRACT: On the basis of combing related theories of the vitality of the existing public space and summarizing the five indexes of the vitality of public space, the author designs questionnaire survey, in which participants evaluate the importance of each index in campus activity space and collects relevant information about spatial cognition. The survey found that the overall user considered all five indicators to be important. Empirical analysis is made to quantify the content of the five evaluation indexes of campus space characteristics, and to analyze the influence of space environment characteristics on the outdoor activities of the users. By establishing the correlation mathematical model, we can conclude that the change of spatial vitality index (independent variable) can affect the user's behavior activity (dependent variable), and then we can get the quantitative calculation method of campus public space vitality.
THE COMPRESSIVE STRENGTH ON C-TYPE FLY ASH-BASED GEOPOLYMER MORTAR Erniati Bachtiar
Lowland Technology International Vol 22 No 2 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i2, Septemb.754

Abstract

Reducing and replacing the use of cement in construction work is one way to create an environmentally friendly city. Cement production produces the effect of carbon dioxide, which creates a greenhouse effect. It is necessary to utilize renewable resources that can replace the function of cement to reduce pollution. This research aimed to determine the value of crystallization and amorphous in two types of fly ash in South Sulawesi-Indonesia. The materials used in this research are sand, fly ash, Sodium Hydroxide, and Sodium Silicate. Samples using fly ash originating from two different steam power plants, which are named fly ash A and fly ash B. Comparison of chemicals Sodium Hydroxide and Sodium Silicate in the manufacture of activators, is 1: 2. The amount of sand used is 2.75 from the amount of fly ash. There are two variations of Mortar samples, namely samples using fly ash A (FA_A) and fly ash B (FA_B). GM_FAA is the A-fly ash geopolymer mortar, and MG_FAB is the B-Fly ash geopolymer mortar. The results showed that the percentage of crystals and amorphous in A-Fly ash (FA_A) were 51.02% and 48.97%, while B-Fly ash (FA_B) was 51.28% and 48.71%, respectively. The use of FA_A material in the production of geopolymer mortars has a higher strength than mortars that use FA_B. The use of a suitable activator composition in making mortars using FA_A is 10 M Natrium Hidroksida with alkaline Modulus 2, while mortars using FA_B is 6 M Natrium Hidroksida with alkaline modulus 1.5.
LONG-TERM MONITORING AND MODELING EXTENT OF AGRICULTURAL-DERIVED NITRATE CONTAMINATION IN SHALLOW GROUNDWATER SYSTEMS OF THAILAND AND POSSIBLE LINKS TO SURFICIAL SOURCES Aksara Putthividhya; Sasin Jirasirirak; Ratchapon Pipitsombat
Lowland Technology International Vol 22 No 2 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Undesirable chemical dissolution in groundwater can cause very serious health problems, whether the chemicals are naturally occurring or anthropogenic origin. In Thailand, soil and groundwater pollution has continued to increase due to population growth and agricultural development in the past decades. Nitrate contamination in groundwater has long been discovered in Thailand, arising from intensive agriculture with excessive fertilization. Contaminant transport modeling efforts in this paper were made to extend further long-term monitoring of nitrate contamination level in Suphanburi and Kanchanaburi and investigate any links of contaminant hotspots in groundwater with possible surface sources for further planning and management. Analysis of 160 groundwater samples collected from domestic and monitoring wells at various depths (100 samples from less than 30 m deep, and 60 samples from more than 30 m deep) for nitrogen (as NO3-), K, sulphate (as SO42-) and other chemicals was carried out. Aqueous NO3- concentration levels in groundwater varied from as low as 0.18 to maximum of 151 mg/L (maximum concentration level = 45 mg/L; Ministry of Natural Resources and Environment Thailand). Consistent K and NO3- patterns from monitoring and production wells in the study area revealed that nitrate source was agricultural origin rather than sewer leakage. 30% of shallow groundwater samples (< 30 m) were detected with higher nitrate concentration than MCL whereas only 23% of groundwater samples taken from > 30 m deep were found contaminated, suggesting the direct association of major nitrate contamination in groundwater aquifer with their potential agricultural sources above ground (i.e., vegetable farming and rice paddy field). The numerical model was developed to generate regional groundwater flow characteristics and piezometric level distributions using the USGS 3D finite-difference code MODFLOW-2000. The well-calibrated regional groundwater flow model was coupled with MT3D to simulate laboratory- and regional-scaled aqueous nitrate transport as well as to project far-future nitrate migration characteristics. Simulated nitrate plume mobility can extend more than 50 km further downstream from the hot spots, suggesting that systematic monitoring well network as well as remediation programs are required for contaminant risk analysis and reduction. Future projections of nitrate transport model can be used to test “what-if” scenarios to improve effectiveness and efficiency of potential nitrate management, planning, and monitoring programs.
Kinetic, isothem and mechansim in paraquat removal by adsorption processes using different biochars TOAN CHI NGUYEN
Lowland Technology International Vol 22 No 2 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i2, Septemb.769

Abstract

This study aimed to explore the isotherm, kinetic and mechanism of paraquat adsorption in aqueous solution by coconut fiber (CFB), corn cob (CCB), bagasse (BGB) and rice husk (RHB) biochars.The method for biochar characteristics are identified using SEM, BET, and FTIR. Kinetic and isotherm data are according to the Pseudo-second-order and Langmuir models. The biochars are arranged according to their capacity: CFB (12, 72 mg/g), CCB (10.27 mg/g), RHB (9.72 mg/g), BGB (7.79 mg/g) where specific surface area and pore volume determine adsorption capacity. The intraparticle diffusion model is used to assess the kinetic rate of the adsorption process, which indicates the rate constant of the external diffusion phase where Kip1 moves faster than the Kip2 and Kip3 phases. Film diffusion has a role in the adsorption process. Pore filling, diffusion, hydrogen bonding, π-π and electrostatic interactions contribute to the mechanism of adsorption. CFB has the highest adsorption capacity (12.72 mg/g), and can be an alternative adsorbent.
THE WALKABILITY OF TRANSIT ORIENTED DEVELOPMENT (TOD): A CASE STUDY OF BANGKOK METROPOLITAN, THAILAND PAWINEE IAMTRAKUL; I-soon Raungratanaamporn; Jirawan Klaylee; Sararad Chayphong
Lowland Technology International Vol 22 No 4 (2021): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i4.772

Abstract

To cope with the crisis of traffic congestion, Transit Oriented Development (TOD) which promotes moving people rather than cars becomes a powerful tool to be considered to alleviate urban mobility problem. To increase transit patronage, non-motorization travel, revenue increase, and urban diversity with livability enhancement, consideration on creative physical form of urban spaces in proximity to transit station must be evaluated. This study considered all aspects of transit station area within walking distance to attract physical activity and balance transportation by incorporating useful variables on evaluation of walking environment within the TOD. This study selected 10 mass transit (sky train) stations in Bangkok, Thailand to investigate the walkability of transit development, and recommend a suitable development of station area’s method that could provide greater accessibility in higher-density settings for non-auto commuting. This could be an explicit policy objective to provide an alternative approach incorporating transportation system with an efficient land use patterns through TOD, with the aim of using the strategic location in the walkability of mass transit stations as an integral part of the existing and future urban development.
The Suitability of Artificial Neural Network Application to Predict Sekayam River Discharge in West Kalimantan, Indonesia Henny Herawati; Suripin Suripin; Suharyanto Suharyanto; Trias Wigyarianto; Kartini Kartini
Lowland Technology International Vol 22 No 2 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i2, Septemb.773

Abstract

Data availability of on a river discharge is the key to waterworks planning. Unfortunately, not all rivers have long and complete historical data records to support the planning. Therefore, a hydrological model capable of predicting long-term river discharge is needed. There are many hydrologic models that have been developed, ranging from the simplest ones by using empirical black-box model, to complex ones with physical white-box model. This study used ANN application due to its data requirement that is applicable to be met in study area, Sekayam River, a part of Kapuas Subwatershed, namely Kembayan Watershed. Although the available data is relatively minimal, which is only rainfall and evaporation data, the ANN application can predict river discharge that is close to the measurement in the field, with a mean square error (MSE) of 0.25. The results show that ANN application was able to predict river discharge reasonably with climate and rainfall data as the input. Deviation may occur due the broad scope of the research area, Kembayan Watershed, a Kapuas Subwatershed which amounted to 2,290 km2.

Page 40 of 47 | Total Record : 463

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