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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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Flip Bucket Energy Damping Model Test on Karalloe Dam Spillway Nabilah Shahnaz; Farouk Maricar; Bambang Bakri
Lowland Technology International Vol 24 No 1 (2022): 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.v24i1.1453

Abstract

The Karalloe Dam was built with the aim of supplying raw water, for flood control and as a tourist attraction. This dam is also a dam with a type of rock embankment with a concrete membrane (Concrete Face Rockfill Dam) which has a side spillway without a door with the Mercu model of the Mercu Ogee type. The purpose of the study was to determine the level of effectiveness of energy absorbers with variations in flood discharge that had been determined using the Flip Bucket type. The research was conducted at the Natural Hydraulics Laboratory, Department of Civil Engineering, Hasanuddin University. This type of research is experimental with a physical hydraulic model test using primary data which includes building design data. The results showed that the calculation and testing on the physical model of the spillway building with a scale of 1:50 and a simulation with a numerical model obtained the results of the length of the jump the greater the discharge, the greater the length of the jump that occurred. At the 10th return period is 37.66 cm and the QPMF return period is 73.84 cm and in model testing the effectiveness of the energy damper is obtained which shows a reduction in the average velocity from the Launcher channel to the energy absorber each period, namely Q10th 44.75%, Q20th 37.79%, Q50th 35.09% , Q100th 32.87%, Q1000th 30.84% and QPMF 34.28%.
Study of The Pandemic Impact of Covid-19 on Road Project Performance in South Sulawesi Province Hasrisal Hasrisal; Muhammad Asad Abdurrahman; Muhammad Isran Ramli
Lowland Technology International Vol 24 No 1 (2022): 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.v24i1.1454

Abstract

The road is a means of circulation space which is made to facilitate transportation by land. Roads have existed since ancient human times and were used to move places and be passed to transport life's equipment, in human development only know roads made of soil that can only be passed on foot or using livestock such as horses, cows or cattle. buffalo. The impact of the spread of Covid-19 has resulted in certain conditions so that efforts to overcome them need to be carried out, one of which is through large-scale social restrictions (PSBB). Based on these considerations, President Joko Widodo has issued Government Regulation (PP) Number 21 of 2020 concerning Large-Scale Social Restrictions in the Context of Accelerating the handling of Covid-19 which was signed on March 31, 2020. Covid-19 pandemic, the performance was measured from the time during the COVID-19 pandemic and after the Covid-19 pandemic with worker productivity and the distance between workers in the field, the level of productivity in projects during the Covid-19 pandemic was 1,284 m3, the distance between workers was 0.894 m, project performance as measured by cost performance during the covid-19 pandemic and after the Covid-19 pandemic - 19 with the BCWSN method until week 11 the realization of the work was 45.72% the cost was Rp. 34,606,561.52. Projects after the Covid-19 pandemic realized 58.61% of work at a cost of Rp. 43,100,392,05, Project performance as measured by work safety performance during the COVID-19 pandemic and the post-Covid-19 pandemic, distributing questionnaires in letter Number: 02 / IN / M / 2020 issued by PUPR with a high index level, namely Provision of Health Facilities in the Field of 4.635 standard deviation of 0.593
Flexural Behaviour of Reinforced Concrete Beams Repaired Using Geopolymer Fiber Mortar Multasam Multasam; Rita Irmawaty; Fakhruddin Fakhruddin
Lowland Technology International Vol 24 No 1 (2022): 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.v24i1.1456

Abstract

Geopolymer is an inorganic material that has brittle properties with low tensile strength. PVA fiber is one of the solutions to improve the strength of geopolymer. This research focuses on the flexural behavior of reinforced concrete beams strengthened by fly ash-based geopolymer and PVA fiber as an additive to get composited with the conventional concrete. The composite layer is applicated to repair and reinforcement of the deteriorating structure. This study was carried out with two variations of materials, named geopolymer with and without PVA fiber and normal concrete as a control beam. Also, there are two variations in the length of repaired and strengthen reinforced concrete beams, those are 1500 mm and 2700 mm in length and with 50 mm in thickness. The results show that the geopolymer mortar with fiber is more ductile compared to the control beam, in which it shows an increase into the maximum load and stiffness. On the other hand, about the failure mode, the geopolymer mortar beam without PVA fiber experienced debonding failure, while the geopolymer mortar beam with PVA fiber experienced delamination failure
Evaluation of Elastic Settlement Behavior in Small-Strain Range of Cement-Treated Clayey Soil Muhammad Akmal Putera; Noriyuki Yasufuku; Adel Alowaisy; Ryohei Ishikura; Jumana G. Hussary; Ahmad Rifa’i
Lowland Technology International Vol 24 No 2 (2022): 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.v24i2.1440

Abstract

Indonesia is developing high-speed railway lines that are expected to connect the major cities. Along the railway, the lowland area is mainly comprised of clayey soil characterized by a high compressibility index and high water content, which causes soil settlement in the long term. Therefore, to reduce the potential of settlement, choosing a suitable railway structure, such as the ballastless track, is essential. Despite the track structure, the subsoil mechanical properties often require improvement to limit the railways’ settlement. Using cement-treated soil, a combination technique was provided to protect the shallow ground and the ballastless track, effectively reducing the stress distribution during construction periods and maintaining low construction costs for developing countries. To assure longer serviceability, there is a high need for an accurate evaluation of the elastic settlement subjected to train loading. Therefore, this paper proposes an elastic settlement prediction model for cement-treated soils considering the curing period, cement content, and confining pressure within the small-strain ranges. The model optimizes the mixing ratio at a specific curing period, reflecting the wheel-base loading on the cement-treated soil layer. Moreover, a simple power formula to determine the initial mechanical properties of the cement-treated soils was proposed.
Impact of urban factors on road accident in Bangkok, Thailand Pawinee Iamtrakul; Yongthanit Pimonsathean
Lowland Technology International Vol 12 No 1 (2010): Vol 12 No. 1, June (2010)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v12i1.1541

Abstract

A decade of road accidents situation in Thailand is a key evidence to call for an in depth understanding for alleviating this complex situation. This study carried out to identify the impact of factors inducing on road accidents in urban area by assessment of the road users' attitude on risk factors. Analytical hierarchy process was applied to determine unsafe component of road environment and the urban factors that significantly contributed to the deterioration of road safety situation. Furthermore, indicators for estimating accident prone area could be also derived in term of mathematical relationships with a visual analysis based on an application of spatial approach. While the specific accident mitigation or safety improvement program can be effortless designed, an inter collaboration among traffic police, health, law, and transport authorities can be gradually initiated in developing a strategy for prevention and sustainable reduction of casualties and deaths on the road.
Projected Climate Indices Impact on the Hydrological Process in the Bago River Basin, Myanmar Suwai Thin; Koichiro Ohgushi
Lowland Technology International Vol 24 No 3 (2023): 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.v24i3.1557

Abstract

Despite the impact of temperature and precipitation patterns on river flow is an emerging issue in hydrology, few studies have been concentrated on the correlation between the hydrological components and climate indices. This study mainly focuses on the projected extreme climate indices and the effects of climate change projections on the hydrological process in the Bago River Basin, Myanmar. It has been noted that the mean monthly maximum temperature values are expected to rise throughout the entire basin under the RCP 4.5 scenario. On the other hand, the annual total precipitation index is anticipated to increase. The findings imply that the groundwater and surface flow will eventually expand as a result of the effects of extreme precipitation indices. Subsequently, there will be a decrease in the lateral flow. Furthermore, it is observed that the effect of temperature indices will cause a significant impact on evapotranspiration. This paper highlights that the crucial part of the extreme climate indices that influence the regional hydrological processes of the Bago River Basin in the upcoming decades.
Stability of Trash Trap Design in Various River Estuary Hairullah Hairullah; Tri Harianto; Achmad Bakri Muhiddin; Upe Zahra
Lowland Technology International Vol 24 No 3 (2023): 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.v24i3.1610

Abstract

In Indonesia, the most serious issue is garbage. As a result, with a total waste of 1.92 million tons, it has been named the number two contributor of plastic waste to the sea. Garbage disposal in the river can be harmful to downstream residents, especially fishermen. Because of the accumulation of garbage in the riverbed, the river becomes very shallow, causing the water to overflow when it rains, which can cause flooding. The goal of this final project is to design superstructure and substructure dimensions and reinforcement. To reduce waste entering the sea, trash traps are built in estuaries by filtering surface waste. The Floating Trash Trap model, as well as its dimensions and sizes, is the scheme and design of the planned trash trap. The focus of the superstructure is on the control of steel profiles and bolt anchors, while the focus of the substructure is on the foundation. SAP 2000 software was used for structural design analysis. The superstructure design results were safe for all existing loading combinations.
Stabilization of Sedimentary Soil with Cement-EPS on Direct Shear Strength Value Suyadi Suyadi; Nurul Marfuah; Achmad Bakri Muhiddin; Kartika Sari; Shafwan Monanda
Lowland Technology International Vol 24 No 2 (2022): 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.v24i2.1614

Abstract

Sediment is material resulting from the erosion process that settles in waterways, rivers and reservoirs. Excessive sedimentation at the bottom of the reservoir will reduce the effective volume of the reservoir which will affect the design life of the reservoir or the service life of the reservoir (siltation). The sedimentation events that occurred in the Bili-bili Reservoir are increasingly worrying because they can criticize the continued functioning of the reservoir. This is a problem that really needs to be taken seriously so that it doesn't have an impact in the future. So, a study is needed on reservoir sedimentary soils Bili-bili to determine the physical and mechanical properties of the soil, This study aims to determine the characteristics of the sedimentary soil used, the effect of adding a variety of cement and EPS - cement and curing to the shear strength value of the soil on the test Direct Shear. The tests carried out were tests of physical properties and mechanical properties of the Bili-bili Reservoir sediment soil with mixed variations, namely the addition of 3%, 5%, 7% and 9% cement, to 0.5% and 0.75% EPS with a curing period of 7 days, 14 days and 28 days and from the results of the study, it was found that the addition of cement to sedimentary soils can increase the specific gravity value and decrease the plasticity index of the soil, where cement can be used as a material for silt soil stability and the silt soil shear strength increases in line with the addition of cement content and increasing curing days.
Effect of Depth on Folding Type Ground Anchor Tensile Force in Soft Soil Muhammad Idhil Maming; Abdul Rachman Djamaluddin; Ariningsih Suprapti; Muhammad Ilham Akbar Mallombasang
Lowland Technology International Vol 24 No 2 (2022): 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.v24i2.1616

Abstract

Soft soil is one type of soil that is commonly found in Indonesia, but in construction, this type of soil is often a problem, namely for soil stability in the process of making building structures. In an effort to determine the stability of the soil or slope, an anchor is used as a measuring medium. Several structures have used anchors and have been developed for various purposes such as slope reinforcement, retaining walls, tunnel stability, and so on. This research aims to analyse the effect of the depth of folding type soil anchor on the tensile force and to analyse the comparison of the tensile force of laboratory experimental testing results with full-scale field testing. The research method was carried out by testing the tensile force of laboratory-scale folding type anchors with depths of 30cm, 60cm and 90cm and field-scale tests using folding type anchors with depths of 100cm, 200cm and 300cm. From the results of tests that have been carried out in the laboratory and the field, it can be concluded that the folding type model anchor does not need to be designed too deep because the anchor has a critical limit where even though the depth is increased it no longer adds a greater maximum tensile force. In addition, the comparison of the tensile force of the laboratory experimental test results with the field full-scale testing.resulted in similar properties of the maximum tensile test results.
Horizontal Resistance Characteristics of Batter-Coupled Spiral Piles under Monotonic and Cyclic Loading Kurokawa, Takahiro; Yasufuku, Noriyuki; Ide, Yuta; Nagata, Makoto
Lowland Technology International Vol 24 No 4 (2024): 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.v24i4.1711

Abstract

Spiral piles have high axial resistance and are used as foundations for small structures. On the other hand, spiral pileshave a lower bending rigidity than steel pipe piles of the same diameter, resulting in a problem of lower horizontal resistance.The authors have focused on a two-pile coupled pile structure with spiral piles, which is also resistant to horizontal forces, andhave conducted research to understand its resistance characteristics. In this study, model tests were mainlyconducted on coupled piles with two spiral piles as batter piles to understand their horizontal resistance characteristics.Monotonic loading tests on a dense dry sand showed that the use of spiral piles as batter piles provided higher elastic limitspring rigidity and horizontal yield load than single piles or vertically-coupled piles. Furthermore, the highest elastic limitspring rigidity was obtained when the angle of inclination of the batter pile was 45°. The durability of the batter piles under thesand conditions of this study was demonstrated by cyclic loading tests at a load equivalent to the horizontal yield load.

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