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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 463 Documents
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Strength Improvement of Cement Stabilized Soil by Binder Mineral Additive T. Harianto; F. Sitepu; Jasrudin .
Lowland Technology International Vol 21 No 2, Sep (2019)
Publisher : International Association of Lowland Technology

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Abstract

The stability of the underlying soil significantly influences pavement construction for long-term performance. Subgrades often have a low bearing capacity in order to achieve adequate capacity under traffic loading. This study presents the strength and bearing capacity of the road pavement by utilization of a binder mineral powder for soil-cement stabilization. The Unconfined Compression Test (UCT) and California Bearing Ratio (CBR) test conducted at optimum moisture content (OMC) and maximum dry density (MDD). The dry-wet cycle (D-W) test also conducted to observe the strength behavior of the stabilized soil. The results show that the mix of the binder mineral and soil-cement, resulting in higher strength and bearing capacity. The strength characteristics of stabilized soil with binder mineral tend to decrease for the initial cycle slightly. In contrast to untreated soil, the strength significantly decreased by subjected to the wet-dry cycle test. These characteristics change of stabilized soil may lead to potential using of binder mineral as an additive for soil-cement stabilized.
Effects of ship waves on riverbank erosion in the Mekong delta: A case study in An Giang province C. N. Thang; T. Hino; C. N X Quang; L G Lam
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.696

Abstract

The Mekong Delta is facing with more and more serious riverbank landslides which have a great impact on people's lives, assets and lives, as well as the socio-economic development of local people. There are many causes of riverbank landslides. This study focuses on the causes of riverbank erosion by ship waves. With increasing traffic density, erosion resulting from increasingly serious. In this study, surveying and collecting wave parameters generated by different means were carried out, and the simulation data using laboratory models was also used. Riverbank erosion is assessed through two criteria: the amount of suspended material in the water and the surface erosion of the soil sample. The results show that the ship waves have a significant impact on the erosion of the riverbank and it is possible to predict the level of the erosion by the time.
Vertical Stress Distribution at Soil Layers with Various Consistencies under the Footing Contact Area Muhammad suradi Suradi; H. A. Hasanuddin; Nursamiah .
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.v22i4.697

Abstract

According to the Elastic Theory by Boussinesq, vertical stress distribution under the footing contact area will diminish with distance from the contact area and it is irrespective of the soil consistency. This study aimed at investigating the effect of the soil stratigraphy and consistency on vertical stress distribution at soil layers under the footing contact area. Soil investigation with CPT tests and relevant laboratory tests were carried out to obtain a reference of compressible soil layer thickness and relevant soil characteristics. The soil stratigraphy and parameters in conjunction with the vertical stress distribution were varied for two different types of soil, a typical granular soil e.g. sand and cohesive soil e.g. clay. Numerical analysis was performed to investigate the effect of the soil parameters on the vertical stress distribution. The results revealed a similarity between those obtained from the Elastic Theory (manual analysis) and numerical study using the PLAXIS software. However, the results of the numerical study showed a significant influence of the soil consistency on the vertical stress distribution at soil layers under the footing contact area.
Shear strength characteristic of unsaturated undisturbed black volcanic ash soil in Kumamoto under static and cyclic loading Okri Asfino Putra; Noriyuki Yasufuku; Adel Alowaisy; Ryohei Ishikura; Ahmad Rifa'i; Yuko Kawaguchi
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.707

Abstract

Black volcanic ash soil which is also known as Kuro-boku soil in Japan is a problematic type of soil. Kuro-boku is usually rich with allophane minerals, which are characterized by unique problematic properties. Through this paper, the shear strength and characteristics of the black volcanic ash soil collected at Kumamoto slope failure after earthquake 2016 were studied using three main approaches. The chemical composition of the black volcanic ash soil was investigated using the X-ray fluorescence analysis. Furthermore, the soil structure disturbance effect due to the earthquake shakes on the total shear strength was evaluated using a simple method that considers the pore size distribution that is reflected from the soil-water characteristic curve. In addition, the constant volume direct shear box considering static and cyclic tests were carried out. It was found that the main chemical content of the black volcanic ash soil is allophane which accounts for about 94 %. Furthermore, the undisturbed samples exhibit a unimodal pore structure, and the disturbed showed a bimodal pore. Since the pore structure of the disturbed sample is unstable, the static shear strength tends to be lower and the degradation index value is higher than that of the undisturbed sample.
Evaluation on indoor thermal comfort improvement of Baffle Natural Ventilation System for rural overhead building in Hot-summer and Cold-winter zone HAIQIANG LIU
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.710

Abstract

The rapid growth in urbanization and economy activities has led to an increase in energy consumption, which hastens the depletion of available energy resources and causing the traditional villages to lose regional characteristics in China. The building sector is one of the major end-users of energy. And On the other hand, the air conditioning system is viewed as an important tool to sustain and improve the thermal comfort of occupants （Thermal comfort assessment and potential for energy efficiency enhancement in modern tropical buildings: A review）, that seriously enhanced the energy and environment risks, especially in Hot-Summer and Cold-Winter (HSCW) zone. Therefore, it is vital to find a green and sustainable way to construct. The problems of rural public buildings in Hot-summer and Cold-winter Zone were analyzed and summarized. The rural overhead public building which authors involved in was selected to be the research object, as its’ avoid hardening of the land and reducing the heat island effect. In combination with the local climate, passive natural ventilation technology, like Baffle Natural Ventilation System, was applied in the overhead layer. Combined with the Venturi effect, the natural wind channel is formed to realize the effect of wind guidance, especially in the mid-season in the HSCW zone. In order to evaluate the Baffle Natural Ventilation System’s impact on the overhead buildings’ indoor thermal comfort, field survey study and simulation were carried out in rural public building of Tonglu town in the HSCW zone in China. Also, PPD-PMV was calculated to evaluate the thermal comfort improvement of the baffle natural ventilation system for a rural overhead building in the HSCW zone. Finally, the method of construction with good climate adaptability was proposed, which provided a reference for a rural intensive construction.
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.
Laterites and Lateritic Soils: Geology, Engineering Properties and Problems R. Shivashankar; B.C. Thomas
Lowland Technology International Vol 21 No 4, March (2020): Special Issue on: Engineering Geology and Geotechniques for Developing Co
Publisher : International Association of Lowland Technology

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Abstract

Lateritic soils are abundantly available in the Konkan belt in the western coast of peninsular India, in the four southern states namely - Kerala, Karnataka, Goa and Maharashtra. Along with heavy rainfall (annual rainfall of 2000mm - 4000mm), the region is characterised by high humidity and little variation in temperatures. The typical stratification in lateritic areas consists of soft to hard lateritic crust at the top – about 3m thick, underlain by a layer of lithomargic clay (8 to 10m thick) underlain by parent rock, which is granitic gneiss. This paper briefly discusses the following aspects of lateritic soils (a) geotechnical properties, including those of laterites, lithomargic clays, lateritic lithomarges and lithomargic laterites (b) erosion studies from hole erosion tests (c) slope stability problems of excavated slopes in lateritic formations (d) role of vegetation i.e. turfing and/or trees on slopes in the stability of slopes. It is concluded that lateritic soils, especially lithomargic clays and lateritic lithomarges (1) behave somewhat like dispersive soils. (2) They are highly erosive by nature, especially lithomargic clays with higher content of sand and silt (3) Stability of both excavated and embankment slopes depends on good drainage control. Providing berms and vegetation on slopes adds to stability of slopes.

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