16,104 Works

Comparison of clear sky models for estimating downward longwave radiation in Thailand

Panatcha Anusasananan, Itsara Masiri & Serm Janjai
In this study, downward longwave radiation data collected on clear sky days at three different sites in Thailand were compared with the values estimated from 12 clear sky longwave radiation models. The downward longwave radiation data used in the comparisons were collected using pyrgeometers installed at three solar monitoring stations located in Nakhon Pathom, Chiang Mai and Ubon Ratchathani. The comparisons showed that model of Prata (1996) gave the best agreement with the values collected...

Estimation of total ozone column using UV spectrum data at Silpakorn University, Nakhon Pathom, Thailand

Kulanist Chiwpreecha, Sumaman Buntoung & Serm Janjai
In this study, total ozone column (TOC) in the atmosphere at Silpakorn University in Nakhon Pathom, Thailand (13.82 ? N, 100.04 ? E) was estimated. In the first step, the Libradtran radiative transfer model under cloudless condition was used to determine the ratio of UV irradiance at 320 nm to that of 305 nm (N value) and to generate a look-up table. The look-up table consists of N values and atmospheric parameters including aerosol properties,...

Investigation of nutrient and coliform bacteria from non-point source on the Chao Phraya river bank in dry season

Nanthachat Pookang, Soydoa Vinitnantharat & Sasidhorn Buddhawong
This research tries to investigate the effect of waterfront building, house and wastewater treatment plant on the river bank of the Chao Phraya river in dry season. Water samples from the Chao Phraya river bank were collected during daytime and analyzed for coliform bacteria and nutrient. Results revealed that mean daily of total coliform bacteria (TCB) of 566?104 CFU/100mL was found at 25 m from river bank near waterfront housing. The high TCB and fecal...

Effect of drought on water resource: a case study of Chao Phraya river

Kwanjira Chantaraprabha & Soydoa Vinitnantharat
This research aims to assess the changing of physical and chemical water quality of the Chao Phraya river in drought condition from the climate change impact. The chemical and physical parameters were evaluated by using the data from fifteen water sampling sites along the river from different land uses. The highest BOD of 6.78 mg/L was found at Prapadaeng district. During the low flow period and drought, high chloride and total dissolved solids (TDS) concentrations...

Impact of climate and land use on Escherichia coli in the Chao Phraya river

Thunchanok Thongsamer, Soydoa Vinitnantharat & Sivawan Phoolphundh
This study examines the land use and microbial quality in the Chao Phraya river during dry season (April 2014). Water samples were collected at the depth of 0.5 and 2 meters from water surface along the river and determined Total coliform bacteria (TCB) and Escherichia coli (E. coli). The long period of dry season and heavy rain make high discharge pollution from land surface into the river. The highest of E. coli was found in...

The effects of a bulking agent and aerobic system on chicken manure composting using "Serial self-turning reactor (STR)" technology

Long Sy Doan & Taweep Chaisomphob
This research aims to evaluate the roles of a bulking agent as recycled compost and aerobic system in a composting technology called "serial self-turning reactors (STR)", using chicken manure as a substrate input. Group A was composted with sawdust in the partial aeration. While group B was processed with a forced aeration at 0.5 lit/min/kg organic matter, and the recycled compost was added beside sawdust. Each group was tested at different C/N ratios caused by...

Development of a GIS-based forest fire risk map: Case of Kuan Kreng swamp forest, Southern Thailand

Thongchai Kanabkaew, Jantira Rattanarat & Songwut Petcharoen
The objective of this study was to assess risk area and its severity classification of forest fire covering the area of Kuan Krang swamp forest using the application of geographic information system (GIS) based on forest fire influencing factors. These factors included land uses, soil types, distance to streams, distance to roads and distance to communities. Each factor was assigned for weighting and rating scales following the literature data, interview data of representative from the...

Multi-criteria decision analysis (MCDA) of iron making technology in Thailand

Sirintip Juntueng & Siriluk Chiarakorn Sirintornthep Towprayoon
The purpose of this study is to evaluate and prioritize iron making technology in Thailand by using Multi-Criteria Decision Analysis (MCDA). The scope of assessment was focused on three iron making technologies are blast furnace (BF), corex and midrex. Three iron making technologies were evaluated by using bipolar analytical hierarchy process (BAHP) based on three main criteria and nine sub-criteria. The qualitative data and quantitative data were collected from government sector, private sector, education sector...

Carbon footprint of educational institute: case study at King Mongkut's University of Technology Thonburi

Nathaphop Jaranpong & Siriluk Chiarakorn
This study aims to calculate GHG emission and removal from the related activities in KMUTT during 2011-2013. The scope of assessment was focused only in KMUTT Bangmod Campus, excluding resident halls and Darunsikkhalai School for Innovative Learning (DSIL). The GHG calculation in this study followed the guideline of carbon footprint for organization which divides GHG sources into 3 scopes such as direct GHG emission, indirect GHG emission from purchased energy and other indirect GHG emission...

Crossroad between sustainability and energy efficiency

Falk Schaudienst, Manuela Walsdorf-Maul & Frank U. Vogdt
Based on the European directive (2002/91/EG) the European Parliament and Council decided that the Member States must apply performance low energy requirement for new and existing buildings. To ensure the certification of energy performance the regular inspection of boilers and air conditioning systems in buildings are necessary. The choice of individual building components but also heating, cooling and ventilation systems as well as lighting significantly influence the energy performance of buildings. This paper deals with...

Prospects for UBC (upgraded brown coal) technology

Shigeru Kinoshita, Yoichi Takahashi & Mitsuhiro Saito
Utilization of low rank coal has been limited so far, due to its high moisture content, low calorific value and spontaneous combustibility. Some lignite has the feature of low sulfur and low ash content. Therefore, it can be turned into an attractive fuel coal, if it is upgraded, using an economical dewatering method. Kobe Steel has been developing upgraded brown coal (UBC) technology since 1980s. By applying the UBC technology for high-moisture coal (total moisture...

Electrochemical oxygen reduction reaction rate in polymer electrolyte fuel cell

Motoaki Kawase, Hidaka Asonuma, Yusuke Nobuta, Miho Kageyama & Inoue
Since optimization of the catalyst layer structure is necessary for reducing the cost of polymer electrolyte fuel cell (PEFC), formulation of the oxygen reduction reaction (ORR) rate in the cathode of PEFC is highly required for carrying out the numerical simulation for the design purpose. The ORR rate was measured with reducing the catalyst layer thickness for lowering the mass transfer resistance to oxygen, proton, and electron. Dependencies of the ORR rate on the oxygen...

A STUDY OF MAINTENANCE METHODS OF DETERIORATED CONCRETE STRUCTURES WITH A RISK MATRIX

YOSHINORI NONOMURA MAKI MIZUTA
In this study, a risk matrix for maintaining the deteriorated RC structures was proposed, in which the difference between the results based on investigation and the actual performance was regarded as risk. The risk matrix was defined as the relation between the degree of material deterioration and the level of influence on the structural performance. This matrix was characterized by involving the range of risk reduction that serves as an index for determining the need...

MECHANICAL PROPERTIES OF GEOPOLYMER CONCRETE WITH MINERAL ADMIXTURES

HYEMI KANG KHOA VO ANH PHAM
Concrete has contributed to the development of modern architectural culture, but the cement as an adhesive agent for concrete produces large amounts of carbon dioxide emissions into the air during the manufacturing process. This study researches the practical use of structure, through the verification of structural stability, for geopolymer concrete. This is part of the development of core technology for greenhouse gas emission reduction by reducing energy consumption in construction, an industry that occupies 25%...

CHARACTERIZATION OF GEOPOLYMERS OBTAINED BY ALKALINE ACTIVATION OF METAKAOLIN WITH HIGH IRON CONTENT

ADRIANA G. GUMIERI ERICA A.S. VASSALO
The use of activated alkali aluminosilicate has been shown to be an economically-viable alternative that decreases the environmental impact of building construction material. Geopolymers are a type of activated alkali aluminosilicate that are rich in SiO2 and Al2O3, and harden within alkaline solutions. In this study, geopolymers obtained by alkaline activation of metakaolin with high iron content were characterized. The activation process used sodium hydroxide solutions at molarities of 12, 15, and 18 mol. The...

SODIUM SILICATE ACTIVATED SLAG-FLY ASH CEMENT

JAN PIETER VERMEULEN And NATALIE LLOYD
This research examines an alternative binder, Alkali Activated Cement (AAC), examining the fresh and hardened mechanical properties of twelve AAC mortar mixes with varying mixture proportions of blast-furnace slag, fly ash, sodium silicate (the alkali activator), and additional water. In addition to the Slag-Fly Ash mortars, nine mixtures with blast-furnace slag, silica fume, aluminum hydrate, sodium silicate, and water were tested. For all mortars, the compressive strength was exponentially related to the water/activator-solids ratio. Mortar...

MECHANICAL PROPERTIES OF FLY ASH BASED GEOPOLYMER CONCRETE WITH ADDITION OF GGBS

V. BHIKSHMA And T. NAVEENKUMAR
Concrete plays an important role in the construction industry worldwide. New technology has made for easier development of new types of construction and alternative materials in the concrete area. Cement is the major component in the production of concrete, but its manufacture causes environmental issues and thus there is a need for alternative materials. Geopolymer concrete is a new type of material with that potential, commonly formed by alkali activation of industrial alumina silicate byproducts,...

DURABILITY OF BASALT FIBERS IN CONCRETE MEDIUM

DAVID LAW HIMABINDU MYADARABOINA
This study investigates the durability of basalt fiber following immersion in a range of chemical solutions representative of the concrete medium. The tests were conducted over a 62-day period and the solutions were sodium hydroxide, sodium chloride, sodium sulfate and combinations of the three. Weight loss was observed in all alkali solutions, with the worst being the combination of sodium hydroxide with sodium sulfate. The impact of chloride was minimal in the alkaline environment and...

MECHANICAL PROPERTIES OF A PVA FIBER REINFORCED ENGINEERED CEMENTITIOUS COMPOSITE

TING HUANG And Y.X. ZHANG
High Performance Fiber Reinforced Cementitious Composites (HPFRCCs) are promising construction materials characterized by tensile strain hardening behavior. Engineered Cementitious Composite (ECC) is a special type of HPFRCC developed with enhanced ductility and durability. Coarse aggregates are usually excluded from the ECC matrix, and the reported ECCs are typically produced with microsilica sand having a maximum grain size of 200 พm. In this paper, a PVA-ECC mixture containing local dune sand with a maximum grain size...

HYDRATION AND MICROSTRUCTURAL PROPERTIES OF CEMENT PASTE CONTAINING NANO AND MICROSILICA

P. L. CHOW And SALIM BARBHUIYA
The influence of nano- and microsilica addition on ordinary Portland cement (OPC) pastes has been studied in terms of hydration and microstructural properties. Three different combinations of nano- and microsilica mixes were used. A constant water-binder ratio of 0.35 was maintained throughout the experiment. All samples were tested for initial and final setting time and compressive strengths were determined at the age of 3, 7, 28, and 90 days of hydration. The hydration products were...

MECHANICAL PROPERTIES OF FLY ASH-BASED ALKALI-ACTIVATED CEMENT USING A STATISTICAL ANALYSIS TECHNIQUE

HYUK LEE And VANISSORN VIMONSATIT
This paper presents the mechanical properties of fly ash-based alkali-activated cement (AAC). A statistical analysis method was used to determine the effect of mix proportion parameters on the dry density and compressive strength of fly ash-based AAC pastes and mortars. For that purpose, sample mixtures were designed according to Taguchi?s experimental design method, i.e., in a L9 orthogonal array. Four factors were selected: ?silica fume content? (SF), ?sand to solid ratio? (s/c), ?liquid to solid...

MECHANICAL PROPERTIES OF WARM MIX ASPHALT CONCRETE APPLICATION USING ADVERA

WATCHARIN WITAYAKUL WEERAKASET SUANPAGA
The article presents the study of physical characteristics of warm mix asphalt cementconcrete (WMA), components designed by the Marshall Method. Stability, flow rate,strength index, air void, and percent voids in mineral aggregate (VMA) of a total of 77specimens were examined as a general standard specification test of the Department ofHighways, Thailand. Limestone was used as aggregate. Adhesive mixtures of asphaltgrade 60/70 were mixed with admixture ?ADVERA? to the ratios of 0.20%, 0.25%,and 0.30% by weight...

AN EXPERIMENTAL STUDY ON THE LOAD CAPACITY OF STEEL SCAFFOLDS WITH LINED SETUPS

CHUNG-MING HO JUI-LIN PENG
Due to high clearances and large spans, some areas of reinforced concrete buildings, such as the entrance lobby of a hospital or the stage area of an auditorium, often need to design large-scale isolated reinforced concrete beams to support the weights from slabs and beams. On construction sites, the falsework of single-line steel scaffolds is often set up underneath these isolated beams based on the lined setup. Since the setup of these steel scaffolds is...

DISPERSION OF WAVE FORCES ON CAISSON BREAKWATERS USING INTERLOCKING SYSTEMS

JIN-HAK YI JIHYE SEO
Interlocking caisson-type breakwaters have recently gained attention for enhancing the stability of the conventional breakwaters. In this study, the dispersion characteristics of wave forces using interlocking systems connecting the upper part of caissons with cables in the normal direction of breakwaters were investigated. Based upon numerical experiments, the higher wave forces are transmitted through the cable as the angle of incident wave increases, while the maximum allowable wave force was capable of being increased by...

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