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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 9 Documents
 1 
Search results for , issue "Vol 21 No 3, Dec (2019)" : 9 Documents clear
Effect of Polymer and Portland Cement on Strengthen Crushed Rock for Pavement Base S. Chaiyaput; D. T. Bergado; J. Ayawanna
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

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Abstract

The effect of concurrent use of liquid polymer and Portland cement as a reinforced material in crushed rock pavement base was investigated in this work. The strength of polymer-treated crushed rock (treated crushed rock) and ordinary crushed rock (untreated crushed rock) were characterized and compared. In strength analysis, the California bearing ratios (CBR) of untreated and treated crushed rock were determined under unsoaked and soaked conditions to simulate post-flood pavement damage. The unconfined compressive strength (UCS) was evaluated under unsoaked conditions for 2h, 1-day, 3-day, 7-day, and 28-day curing periods. The results showed that the CBR of untreated and treated crushed rock under soaked and unsoaked conditions were positively correlated with dry density. The CBR under the unsoaked condition of untreated crushed rock was identical to that of treated crushed rock. Meanwhile, under the soaked condition, the CBR of treated crushed rock was twice as higher than the untreated crushed rock. The swelling indices were 0% for both untreated and treated samples. The UCS of treated crushed rock showed positively correlation with the curing time. The use of liquid polymer and Portland cement, therefore, improved the strength of crushed rock pavement base in which effectively mitigate the post-flood pavement damage.
Prediction Formula For Unconfined Compressive Strength of Cement Treated Soft Soil During Full Age J. J. Yang; H. Liu; Q. Liu; M. R. Dong; M. Wang; R. Mi
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

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Abstract

Cement stabilization method is one of the ground improvement techniques and has been also used for the purpose of utilization of dredged clay or construction muck. The long-term strength of cement soil is influenced by many factors such as cement content, water content, curing age and soil properties. In this study, a new formula without fitting parameters, which was based on the functional relationship without fitting parameters between the unconfined compressive strength and the curing age which was proposed by Yang et al., was proposed for predicting the unconfined compressive strength of cement treated soil during full age, The results show that the formula can properly predict the strength growth of cement treated soil by comparing with the experimental data that was cited from the literatures.
Foreign tourist behavior and perception of motorcycle accident risk in Chiang Mai, Thailand P. Iamtrakul; S. Chaypong; J. Klaylee
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

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Abstract

Motorcyclists are one of the most vulnerable road user groups in developing world, especially Thailand. Due to its propensity to threats during traveling, tourism industry has some reservations on its quality and adequacy for travel. More specifically, traveling with motorcycles in unfamiliar route has been found to be a major risk for all motorcyclists. Thus, this study aimed to explore relationship this risk poses to the foreign tourists with respect to socio-economic, knowledge and perceptions of those motorcyclists, by conducting the site investigation together with a questionnaire survey. A total of 400 samplings of foreign tourists in Chiang Mai, Thailand was analyzed by applying logistic regression based on binary model. This research found the important factors influencing this risk behavior relatively in high proportional order as follows; 1) understanding of the traffic regulations and 2) possession of adequate and valid travel insurance. Therefore, safety knowledge training especially as it relates to traffic regulation for accident prevention could play a key role in prevention of motorcycle‐related injuries and fatalities. This promising intervention in highly recommended in environments where road safety measures, particularly enforcement activities, are commonly limited.
Potential failure of Soekarno Bridge Foundation Cause of Liquifaction F. J. Manopo; A.G.D. Warouw; J.R. Talumepa; C.J. Manoppo
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

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Abstract

Earthquake occurring may trigger many secondary hazards. One of those hazards is liquefaction which is a phenomenon where part of soil loses it stiffness due to cyclic load. This paper evaluates the liquefaction potential of Ir. Soekarno Bridge located in Manado, Indonesia using its own soil properties acquired from standard penetration test (SPT). Using Simplified Seed & Idriss (1971) as the basis method, based on this method, if the safety factor value exceeds one, the soil has a liquefaction potential. Calculation were done using NovoLiq software with the peak ground acceleration (PGA) = 0.732 g and shallow water table. Analysis result by applying previous soil and earthquake parameters shows that there is a potential of liquefaction on the bridge’s foundation at the layer I ~ II (0 ~ 12m). Further analysis of the foundation stability against liquefaction using Pile Group GEO5 software shows there is increasing of horizontal displacement by 19.4 mm at service load, settlement increase by 0.7 mm at service load, and bearing capacity wearing off equal to 19008.45 kN. Based on analysis results, we conclude that the Ir. Soekarno Bridge have a potential of liquefaction during 7.5 Mw earthquake.
The Effect of Thermal Activation Time and Different Curing Condition On Bamboo Ash Andi Dibya Widadi
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v21i3, Dec.711

Abstract

At the time of the execution of the construction project are frequent discrepancies between a sign and a schedule of realization in the field that can lead to an implementation time and swelling she cost so that the actions of the project becomes obstructed. The delay in the implementation of the construction project could be addressed by conducting acceleration in its implementation in order to achieve the targets of the plan. However in decision-making to accelerate the implementation of the work certainly should pay attention to factors of financing so that the expected results are valid minimal cost without neglecting the quality standards that you want. One method of acceleration duration that can be used this way is a method of exchanging time and costs or time cost trade off. The purpose of this method is to speed up the implementation of the project and analyze the effect of time can be shortened by the addition of costs so as to note the most maximum acceleration and the most minimal. The calculation starts with the search for critical path and then going to get charged slammed into do the slopes. Next suppressor duration starts from the activity that has the lowest cost. From the results of both the addition of overtime hours, the addition of 4 (four) hours of overtime are more advantageous in terms of costs and time because the total cost of the guardian only happens in relatively small amounts and the resulting time efficiency is higher than additions to the 7 (seven) overtime hours.
The Effect Of Thermal Activation Time and Type Of Fly Ash On The Compressive Strength Of High Volume Fly Ash-Bamboo Mortar S. Hamzah; E. Aprianti
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

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Abstract

A growing number of concrete productions per year will lead to increase manufactured cement significantly. Bamboo is one of the main materials from agriculture, it has many function particularly in the field of agriculture. This research is including waste materials origin from bamboo. The methodology used are curing in a hot water after 24 h and curing at the room temperature. The compressive strength is equal to the mortar containing 100% cement. Thermal activation then following air curing (HAC) is the effective way to produce a denser microstructure of mortar containing cementitious materials and consequently to achieve the higher compressive strength with lower water absorption.
Experimental Study On Clay Stabilization With Waste Limestone From Marble Industri A. B. Muhiddin; T. Harianto; A. Arsyad; Indrayanti .
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

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Abstract

In this research, chemical stabilization on clay soils was performed using waste limestone powder from marble industry and acrylic acid. The research was aimed to analyze the characteristics of waste marble, to analyze clay strength before and after stabilized with waste marble powder, to analyze the effect of acrylic acid as activator in clay stabilization using waste marble, and finally to study the microstructure of soil stabilized by marble powder and acrylic acid solution. Laboratory tests were performed by mixing marble powder in the amount of 5%30% of clay and with addition of acrylic acid solution as much as 5%-15% of water mixed. For soil microstructure study, SEM and XRD tests were conducted. Clay mixture with 20%-30% of marble powder increased CBR value to more than 6%. Addition of acrylic acid solution with optimum content of marble powder with 3- and 7-day curing increased the value of UCS to medium consistency. Marble powder contains dominantly of CaO compound of 97.15% which is an effective material for clay soil stabilization. These results show that the mixture of clay with marble powder and acrylic acid as stabilization agents could increase soil bearing capacity for road subgrade layer.
Geometric Registration of High Spatial Resolution Images Based on Google Earth Image and Global DEM Data J. T. Zhang; X. XU; J. Zhang
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

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Abstract

application of remote sensing technology is expanding. Before the application of remote sensing images, geometric registration and other preprocessing are often required for tilt correction and projection error correction, which often requires the selection of ground control points. Given the lack of measured ground control points, the correction accuracy will be greatly limited. In this paper, a remote sensing image orthographic correction process based on Google earth and Global DEM is proposed. First, in ENVI5.3, the image to be corrected and the reference image (Google Earth image) were automatically matched with the corresponding ground object points to obtain the coordinate file of the correction control point (.pts), and the coordinates were converted to plane coordinates. Under the ArcGIS10.2 platform, the data of the coordinate table of the correction control points were converted into the ArcGIS point file (SHP). Finally, the point file was spatially superimposed with the elevation data of Global DEM to obtain the elevation value, and then the ground control point file with elevation value was obtained, and then the orthographic correction with control points was carried out. The result showed that compared with the orthophoto correction without control points, the processing process adopted in this paper can improve the accuracy of correction, and the accuracy can meet the requirements of the 1:10000 land survey in the working base map. This research is expected to provide a new method for obtaining high-quality digital orthophoto images needed for land surveys.
An AN ANALYSIS OF SURABAYA RIVER CARRING CAPACITY BASED ON THE LAND-USE DIFFERENCES Yulfiah Yulfiah Yulfiah
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v21i3, Dec.890

Abstract

Surabaya River has been indicated receiving a great pressure from the activities of people living and industries along the river. Currently, this river is still the major source of water supply for Water Source Department in Surabaya City (“PDAM Surabaya”). For this reason, the prediction of carring capacity in Surabaya River is needed. The ecosystem degradation is expected to decrease. The calculation is based on the differences of the existing land-use in the Surabaya watershed. The results of the load capacity demonstrate that the maximum BOD (Biologycal Oxygen Demand) and permitted BOD waste have a relatively wide tolerance span on some segments. Therefore, it takes a long time to reach critical points and positions on some segments. However, the maximum tolerance of BOD load and BOD of waste permitted in the dry season is lower than in the rainy season. Briefly, excessive waste disposal must be controlled to create a sustainable ecosystem in Surabaya River.

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