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Engineering Journal

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This is an Open Access Journal

Open Access journal
ISSN (Print) 0125-8281 - ISSN (Online) 0125-8281
Published by Chulalongkorn University

[2 journals]

Effect of Mimosa Grafting on Anatomy, Chemical Composition and Tensile Properties of Bamboo Fiber
- Authors: Shamsun Nahar|Mahbub Hasan
  Abstract: The current study presents systematic and improved methodologies to characterize elementary bamboo fiber grafted with mimosa. For that, bamboo culm anatomy was observed under scanning electron microscopy (SEM), chemical analysis was conducted and tensile properties were measured. During surface analysis, smoother surface was found for grafted fiber compared to the control fiber. No significant change in chemical composition was observed after grafting. The tensile strength of control bamboo fiber and mimosa grafted fiber were found to be 882±307 MPa and 978.29±283 MPa respectively. The Young’s modulus for 5, 10, 15, 25 and 35 mm span lengths for control fiber were 10.41±4.52, 17.90±7.67, 23.67±8.66, 29.49±4.78 and 33.52±11.04 GPa respectively, while the same for mimosa grafted fiber were found to be 12.31±4.52, 20.37±7.67, 24.82±8.66, 31.49±4.78 and 35.82±11.04 GPa respectively. After correction the Young’s modulus was found to be 33.86 and 44.45 GPa for control and grafted fiber respectively. Strain to failure of bamboo fiber was found to be 3.90% found for original sample and 2.32% for grafted sample. Thus it can be concluded that mimosa grafting seems to be useful for stronger bamboo fiber with more reliable results.
  PubDate: 2013-01-02
  Issue No: Vol. 17 (2013)
An Overview of Applying Surfactants to Modified-Functionalized Nanoporous Materials for Sequestration of Metal Ions
- Authors: Suwimol Wongsakulphasatch
  Abstract: This paper presents an application of surfactants extended to environmental remediation. The promising process related to the use of surfactants for heavy metal sequestration purpose named “modified-functionalized nanoporous materials” is summarized in this work. The unique characteristic of high selective of the functional groups and large surface area of nanoporous support makes this material becomes a powerful tool for sequestration of target metals. The strength of this adsorbent is fast sorption kinetic, high thermal and chemical stability, easy handling, and the ability to regenerate.
  PubDate: 2012-12-23
  Issue No: Vol. 17 (2012)
Evaluation of EZStrobe Simulation System as a Tool in Productivity Analysis - A Case Study: Precast Concrete Hollow-Core Slab Installation
- Authors: Wisoot Jiradamkerng
  Abstract: This research’s objective was to evaluate the EZStrobe simulation system as a tool in productivity analysis by selecting precast concrete hollow-core slab installation work as a case study. The study started from determination of work elements of precast concrete slab installation work, after that the time data for each work element were collected from construction site to meet 95% confidence interval and 5% limit of error. The Multiple-Activity-Chart then was created, using average time required for each work element, to derive for cycle time of installation work. The alternated tool, EZStrobe simulation system, then was introduced to determine for cycle time by creating a model with stochastic time data. The results, in term of basic cycle time and idle time percentages, from simulation had been compared with deterministic method, Multiple-Activity-Chart model, which validated that EZStrobe simulation system could well represent the construction process. After that, more complicated model was created to see the effectiveness of the system by simulating more realistic site conditions e.g. limited space for hollow-core slab truck in site, number of precast concrete slab per truck. The required results; basic cycle time (min), standard cycle time (min), productivity (pieces/day and square meter/day), and unit cost (Baht/piece); were also formulated in this new model. These outcomes were very useful for construction planning, scheduling and unit cost estimation. Furthermore, the EZStrobe simulation system could give the insight understanding of construction processes for work study and improvement. After all evaluation, the researcher found that this non-commercial EZStrobe simulation system was very worth using for productivity analysis and also the user-friendly Microsoft Visio© interfaces were truly enhanced the system performances, especially in creating the models.
  PubDate: 2012-11-25
  Issue No: Vol. 17 (2012)
Factors Decomposition of Indonesia’s Household Electricity Consumption
- Authors: Yusak Tanoto|Maria Praptiningsih
  Abstract: Household sector has been ranked the largest electricity share over decades in Indonesia. As response to the ever growing power demand in this sector, corresponding energy policies should be appropriately formulated based on the understanding of the past electricity consumption in household sector. This paper presents a study of factors decomposition of Indonesia’s household annual electricity consumption for the period 2000 – 2010 using additive-Logarithmic Mean Divisia Index (additive-LMDI) method considering current and constant pricing reference. Given a total of 29,285.2 GWh electricity consumption, production effect contributed for 75.2%, under the constant price or far less compared with that obtained under current price, or with 224.3%. Contribution of the electrified household to the total output of national economy were 19.5% and 13.7%, using constant price and current price, respectively. Meanwhile, the efficiency effect was also contributed for a total positive electricity consumption growth with 5.3% under the constant price. In contrast, the same effect was contributed an opposite direction with a decrease of 138% under the current price. Nevertheless, the intensity effect was still contributed toward a positive household’s electricity growth, given the efficiency improvement was failed to decrease the total change during the study period.
  PubDate: 2012-11-14
  Issue No: Vol. 17 (2012)
Determination of Natural Frequency of Aerofoil Section Blades Using Finite Element Approach, Study of Effect of Aspect Ratio and Thickness on Natural Frequency
- Authors: Kamlesh Purohit|Manish Bhandari
  Abstract: In this paper an attempt has been made to calculate the natural frequencies of aerofoil section blades using the finite element method. The effect of varying the aspect ratio and thickness on the frequencies has also been studied. It is observed that by increasing the value of aspect ratio, the natural frequency in all the modes is increased. It is also concluded that, there is some optimum value of thickness at which the natural frequencies in different modes of vibration are minimum.
  PubDate: 2012-10-29
  Issue No: Vol. 17 (2012)
An In-Depth Investigation of Roadside Crashes on Thai National Highways
- Authors: Opas Somchainuck|Pichai Taneerananon|Saravut Jaritngam
  Abstract: The numbers of road crashes in Thailand, which result in about 12,000 deaths each year, about 12% of these crashes occur on national highways under the jurisdiction of the Department of Highways (DOH). For the past four years, 2007-2010, roadside crashes have constituted between 42.2 – 47.9 % of the total crashes on the DOH’s highways. This paper aims to improve the roadside safety situation in Thailand. The cases involve vehicle hitting roadside trees, which is one of the most serious and common roadside crashes in Thailand. This paper provides overview details of the investigation into the cause of roadside crashes and to the strategies about how to deal with this serious problem. The strategies are described in the DOH Roadside Safety Strategic Plan 2009-2013 that the authors have contributed to its development.
  PubDate: 2012-10-29
  Issue No: Vol. 17 (2012)
Atmospheric Corrosion of Reinforced Concrete Steel in Tropical Coastal Regions
- Authors: Abel Castañeda|Francisco Corvo|Jaun José Howland|Tezozomoc Pérez
  Abstract: The influence of atmospheric parameters and chloride deposition rate on concrete using an atmospheric corrosion approach is rarely found in literature. Seven exposure sites were selected in Havana, Cuba and two at Yucatan Peninsula, Mexico, to expose reinforced concrete samples. Two significantly different atmospheric corrosivity levels have been observed after two years of exposure in Havana depending on atmospheric chloride deposition and the w/c ratio of the concretes. Changes in corrosion current are in accordance with changes in chloride penetration and atmospheric chloride deposition. The influence of sulphur compounds deposition should be considered to study atmospheric corrosion of reinforced steel in concretes either in Havana.
  PubDate: 2012-10-14
  Issue No: Vol. 17 (2012)

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