Failure Mechanism of Soil Behind Gap of Contiguous Pile Wall (original) (raw)
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The Journal of King Mongkut's University of Technology North Bangkok, 2018
This research studied the effect of fly ash on chloride diffusion coefficient and compressive strength of both recycled and natural aggregate concretes exposed to marine environment for 5 years. Mae-Moh fly ash was used to replace Portland cement at the percentages of 0, 15, 25, 35, and 50 by the weight of binder with various water to binder (W/B) ratios of 0.40 and 0.45 in recycled aggregate mixtures and a W/B ratio of 0.45 in natural aggregate mixtures. Concrete cube specimens of 200×200×200 mm 3 were cast and cured in fresh water for 28 days and then were placed in a tidal zone of marine environment. The compressive strengths of the concrete exposed to marine environment for 5 years as well as the total chloride diffusion coefficients of the specimens were determined. The Results revealed that the compressive strengths of recycled aggregate concretes decreased after being exposed in marine environment for 5 years, whereas those of natural aggregate concretes and fly ash increased after 28 days of curing. Evidently, higher in fly ash contents would lower chloride diffusion coefficients of both recycled and natural aggregate concretes. Furthermore, use of fly ash as low as 15% replacement by weight in recycled aggregated concretes could provide lower chloride diffusion coefficient compared to Portland cement containing natural aggregate concrete with W/B of 0.45.
The effect of safety measure in construction: a case study column reinforcement
2017
The purpose of this research is to study the effect of a safety system provided for column reinforcement activity on productivity by studying a construction of buildings in Bangkok. The safety system composed of (1) stable scaffolding system, (2) providing clean and not slip walkways on the scaffold, (3) installation of handrails not less than 0.90 meters in height, (4) installing stairs, and (5) providing personal protective equipment for workers. Cost of the safety system is 40,030 baht for a column reinforcement area of 40 numbers. Productivity rates for prior and after the used of safety system are 11.06 and 8.80 kg./person/hr., respectively. The productivity declines for approximately 20.43 %, the working time for column reinforcement could take longer for 13.18 % and labor cost could increase for 13.32 %.
The Available Water Capacity in Landslide Area
2019
Soil water is very important for ups tream because plants used to grow up, affect to the health and sustainability of the ecosystem. The severe landslide occurred in 2006 at the upstream region of Maepoon sub-district might affect soil water holding capacity. This study aimed to assess the soil water content in the ecosystem of upstream under normal condition and after landslide condition (10 years ago) using Soil and Water Assessment Tool (SWAT) model. The SWAT model was calibrated and subsequently the accepted values of R 2 , NSE and PBIAS were 0.58 0.48 and 8.91, respectively. The results from SWAT analysis showed highest soil water in October for the entire area, particularly in low-slope areas. A rainfall retained in soil was approximately 5.15% (10.91 million cu.m.). The available water capacity (AWC) of almost watershed (87.20 km 2) was 39.55 million m 3. The highest value of mean monthly soil water content was found in mixed deciduous forest with bamboo with 180.82 mm, followed by mixed fruit tree-based agroforestry (174.01 mm), mixed deciduous forest with bamboo after 10-year landslide (133.18 mm) and mixed fruit tree-based agroforestry after 10-year landslide (129.34 mm), respectively. The comparison of two ecosystems under normal condition and after 10-year landslide condition shows that soil 97 วารสารวนศาสตร์ 38 (1) : 96-111 (2562) water content in landslide area was lower than normal condition. The results indicate that the landslides can decrease soil water content in this region.
2020
This research aimed to study the loss in energy from waste process, analyze causes, and provide a guideline to reduce the loss by analyzing defects and effects. This study was based on 20 key informants from the waste electrical power plant in Khon Kaen, as a case study. The data were analyzed with Process Flow Chart, Pareto chart, Risk Assessment, Cause and Effect matrix, Defect and Impact Analysis (FMEA), and Relationship Diagrams. The results showed the loss in the energy from waste process came from the stoppage of waste incineration. The study found that the reverse and forward stepping grate machine was a cause of the loss. As a result of the analysis, the loss reduction by analyzing the defects and the impact, it suggested increasing frequency of monitoring the distance (GAP) of the Grate Bar, installation thermometer under the continuous combustion chamber, and checking cleaning fan system every two hours . These guidelines could reduce loss in the energy from waste proce...
An engineering feasibility study of lam chi long small hydropower project
Engineering and Applied Science Research, 2012
This article presents an engineering feasibility study of Lam Chi Long small run-of-river hydropower project. The study was started by data collection, creating a longitudinal profile of the river, and locating a proper site of intake and 3 alternative sites of power plant. The meeting of the villagers, the local administration officials, and stakeholders was then organized in the project area. The meeting aimed to allow them to consider the project possibility and their cooperation. The natural stream discharge at the intake site, the design and the effective discharge were then calculated. There were 3 alternative values of the design discharge i.e. equal to the minimum flow, and to 50% and
Burapha Science Journal, 2017
The campaign of power plant from a renewable energy is a well - thought - out process employed by Thai government to substitute or diminish the dependence on the fossil energy . Many biomass projects have yet come across management problems. A study of critical indicators for establishment of community - based biomass power plant ( CBP ) is a promising way for approaching practical consideration of biomass power plant projects . This research employed a multi - stage sampling technique which separated the data by locations and business operations . The total of 1,151 questionnaires is collected from the local communities around the seven target areas. The indicators were measured by confirmatory factor analysis for evolving the causal model of CBP establishment. Research findings were as follow: 1) the indicators of community expressed that are information, management participation, the importance of community, biomass communication network, worthiness, and sincerely support; 2) the indicators of technology expressed that are the optimized technology, innovation, and technology transfer; 3)the indicators of biomass residue expressed that are the available biomass residue, long term contract, the financial subsidization, low cost cultivation, the additional income, and the location of CBP; and 4) the indicators of government support stated that are research and development, the participation of government, policy for establishment, and interest condition. The results fitted with the empirical data at 0.05 statistically significant level.
Development of a Biomass Briquette Machine from Agricultural Waste in Rayong Province
The Journal of King Mongkut's University of Technology North Bangkok, 2024
Biomass briquette charcoal has been studied using a variety of agricultural waste materials. The outcome revealed that the charcoal bars are still inefficient in use because of their fragility, high moisture causing mold, difficulty setting up, short burning times, and smoky. The aims of this research are to build up a biomass charcoal briquette machine and to examine the raw material proportions. Durian peel and mangosteen peel charcoal were mixed with cassava starch. The mixing ratio by weight between Durian peel and mangosteen peel was 4 : 1, 2 : 1, 3 : 2, 1 : 1, 2 : 3, 1 : 2, and 1 : 4. The biomass charcoal briquette machine was evaluated for its forming ability, physical shape, and density while the properties of charcoal briquettes were analyzed based on American Society of Testing and Materials (ASTM). The results reveal that this machine is efficient to use considered by smooth surface, sturdiness, and density (604.94–612.12 kg/m3). The charcoal briquettes made from durian peel and mangosteen peel in the ratio of 1 : 4 can be achieved all criteria which have the highest calorific value of 5,572.78 kcal/kg, the lowest moisture content of 4.82%, the minimum volatile matter content of 7.26%, the minimum ash content of 9.47%, the maximum fixed carbon of 75.39%. Also, it has a bulk density of 606.32 kg/m3, a heat utilization efficiency of 22.79%, and a burning time of 99.47 minutes.
Rheology properties of elongational flow experiments
The Journal of Applied Science
The objective of this article is to discuss on rheology properties used in 3 types of conventional extension flow experiments; uniaxial, biaxial and planar elongational flows. These standard flow experiments can be tested in either steady extensional rate 0 ε which is called steady elongational flow, and unsteady extensional rate () t ε such as extensional oscillatory, stress growth, stress relaxation (or some time called step elongational strain) and creep experiments. To synchronize these standard test properties and symbol notations, the society of rheology (SOR), United State of America, has declared those properties and symbol notations for its rheologist members from time to time.
The influence of friction time and contact angles in friction welding for Polyethylene pipes
2011
This paper is aimed to apply friction welding technique to weld HDPE pipes as well as to investigate the influence of friction time and contact angle to the property of joint. The welding machine was designed and manufactured in order to conduct the experiment under various welding conditions. HDPE tubes were used in this study and their outer diameter is 90 mm and 8.2 mm thick. The friction times were varied from 2, 3, 4, 5, 6, 8 and 10 sec. While the contact angles were 0, 45 and 90. Other welding conditions were constant i.e. friction pressure (P 1) 1 MPa, upset pressure 1 MPa, rotational speed 700 rpm and upset time 30 sec. The welded specimens were tested under tension, bending and pressure. The result suggested that as the friction time increases, tensile strength, bending strength as well as pressure resistance of tube are increasing. It was also observed that with the contact angle of 45 and 6 sec of friction time, the welded specimen has strength of 20.53 MPa which is about 15.86% higher than the master tube. In case of bending test, the tube with 45 contact angle provided highest value of bending resistance. However, it was observed that as the value of friction time increases, the resistance of bending tends to increase in similar pattern for every contact angles.