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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 11 No 1, June (2009)" : 6 Documents clear
ANALYSIS OF REINFORCED SOIL WALL CONSIDERING OBLIQUE PULL: BILINEAR FAILURE MECHANISM – LINEAR SUBGRADE RESPONSE I P. V. S.N. P. Kumar; M. R. Madhav
Lowland Technology International Vol 11 No 1, June (2009)
Publisher : International Association of Lowland Technology

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Abstract

The available methods of analysis and design of reinforced soil walls consider only the axial pullout of the reinforcement. But, in practice, the reinforcement is subjected to oblique pull because of which the backfill below the reinforcement deforms transversely mobilizing normal stresses at the interface. As a result, the shear resistance mobilized along the reinforcement – backfill interface could be different and considerably more in case of oblique pull compared to the value corresponding to only axial pull. A new method to estimate the mobilized transverse forces in reinforced soil wall is presented. A modified factor of safety is defined, estimated and compared with the conventional one to establish the significance and contribution of the mobilized transverse forces. A parametric study quantifies the contributions of the global subgrade stiffness factor, length of reinforcement, the oblique or transverse displacement, and angle of shearing resistance of the backfill, interface friction angle and the number of reinforcement layers on the modified factor of safety and improvement ratio.
APPLICATION OF BIOMASS FLY ASH AS A POZZOLANIC MATERIAL FOR STABILIZATION OF LOW-SWELLING CLAY R. Rachan; W. Chim-oye; S. Horpibulsuk
Lowland Technology International Vol 11 No 1, June (2009)
Publisher : International Association of Lowland Technology

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Abstract

The present paper investigates the possibility of utilizing biomass fly ash to partially replace Type I Portland cement for stabilization of a low-swelling clay. It is found that the fly ash can be used as a pozzolanic material. The 10% replacement ratio is an effective ratio where the input of fly ash is sufficient for secondary reaction. The influential parameter controlling the strength development of blended cement is clay-water/cement ratio, wc/C. The cement content of the blended cement is the summation of the input of cement, Ci and the equivalent cement, Ce. The Ce is determined based on the concept of an efficiency factor (k), which is adopted as a measure of the relative performance of supplementary cementing material compared with Type I Portland cement. The Ce is equivalent to kF where F is fly ash content and k is efficiency factor. From the analysis, the value of k is dependent upon the replacement ratio and curing time, and irrespective of binder content and water content. A phenomenological model for assessing the strength development is introduced and verified. It can possibly be applied as a simple and rational tool for predicting the strength development of other blended cement stabilized low swelling clays.
BEHAVIOR OF STIFFENED DEEP CEMENT MIXING PILE IN LABORATORY P. Jamsawang; D. T. Bergado; A. Bhandari; P. Voottipruex
Lowland Technology International Vol 11 No 1, June (2009)
Publisher : International Association of Lowland Technology

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Abstract

The low strength and stiffness of Deep Cement Mixing (DCM) pile causes unexpected failure that has been mitigated with the introduction of stiffened deep cement mixing (SDCM) pile. The SDCM is a new type of DCM pile reinforced by concrete core pile. In this paper, the interface behavior of SDCM pile and its strength have been studied by various laboratory tests. The cement content was varied from 10 to 20% by dry weight of clay and mixed at the water content corresponding to its liquid limit to obtain optimum strengths. The interface friction between the core concrete pile and the cement-admixed clay was studied by means of the direct shear tests and Ko interface shear tests. The 15% cement content yielded optimum interface shear strength. The CIU triaxial compression test of model SDCM pile revealed that the concrete core pile length should be more than 75% of the DCM pile length in order to have significant improvement.
BORED AND DRIVEN PILE TESTING IN BANGKOK SUB-SOILS A. S. Balasubramaniam; E. Y. N. Oh; N. Phienwej
Lowland Technology International Vol 11 No 1, June (2009)
Publisher : International Association of Lowland Technology

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Abstract

As a necessity to support an increasing magnitude of loads from tall buildings and long span bridges, the piling practice in the Bangkok Plain has moved several phases from driven pre-cast reinforced and pre-stressed concrete piles of smaller cross sections to spun piles and large diameter bored piles. The Chao Phraya plain in which the Bangkok city is located is low-lying and consists of a broad basin filled with sedimentary soils which form alternate layers of clay, sand, and clay. The upper clay layer is soft and highly compressible followed by a stiff clay layer extending to about 20 m or so and then followed by a layer of sand. Driven piles are normally taken down to this upper sand layer. However when the demand for a higher capacity arise, these piles cannot be extended in length due to construction problems and as such bored piles are needed to be taken down to as deep as 50 to 60 m. Below the upper clay layer there are eight interconnected aquifers from which ground water is pumped from deep wells. Thus in the design of piled foundations aspects such as the negative skin friction due to pile driving as well as deep well pumping are also needed to be considered. Some of the experiences gained over a period of 30 years in the study of piled foundations in the Bangkok Plain are briefly presented in this paper.
ENVIRONMENTAL IMPACTS CAUSED BY PADDY FIELD MANAGEMENT V. V. N. Murty; N. Cao Don; H. Araki
Lowland Technology International Vol 11 No 1, June (2009)
Publisher : International Association of Lowland Technology

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Abstract

Paddy fields occupy large areas and are an important component of the cropped areas in the Asian Region. In this study, the environmental impacts caused by paddy field management are investigated and studied. It is observed that paddy fields cause both beneficial and adverse effects on the environment. The beneficial effects consist of flood retardation, sediment retention and recharge to groundwater. Important adverse effects are contamination to water resources, effect on human health and methane emissions. Steps needed to mitigate the adverse effects from paddy fields are also considered. These include understanding the water balance components for efficient water management, provision of surface and subsurface drainage systems and recirculation of drainage water. Water quality aspects, which need to be considered while recirculation drainage water and final disposal of the drainage water, are also studied. While all aspects of water quality are important, in general water quality aspects, which need attention, appear to be the total nitrogen and pesticide residues. Further studies are needed to manage both these constituents of the drainage water.
DISCUSSION ON “COMPETITIVE SORPTION OF MULTIPLE COMPONENT HEAVY METALS FROM GOLD MINING LEACHATE ONTO LATERITE SOIL” LOWLAND TECHNOLOGY INTERNATIONAL, 10(1), 54-64 Z. Li; X. Tang
Lowland Technology International Vol 11 No 1, June (2009)
Publisher : International Association of Lowland Technology

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Abstract

After going through the paper written by A. Putthividhya published in Lowland Technology International 10(1) 54-64, we found that there are some points in the methodology and analysis of results necessary to be clarified. Whilst essentially the experimental approach was straightforward and sound, beyond this, however, the analysis and the interpretations drawn are far from satisfactory.

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