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Nakhon Ratchasima, Thailand

Vongchavalitkul University is a private university located in Nakhon Ratchasima, Thailand. Founded in 1984 as Vongchavalitkul College, it was upgraded to a university status in 1994. Currently the university offers 26 undergraduate degree programs, 5 masters degree programs, and 4 doctoral degree programs. Wikipedia.

Uchaipichat A.,Vongchavalitkul University
Geomechanics and Engineering | Year: 2010

An experimental program of isotropic loading tests on a compacted kaolin using a conventional triaxial equipment modified for testing unsaturated soils was perform to investigate a loading collapse curve of unsaturated soils along wetting and drying paths. The test data are presented in terms of effective stress on a range of constant suction. The suction hardening behavior was observed for both wetted and dried samples. With the use of an appropriate effective stress parameter, the unique relationship for loading collapse curve for wetting and drying processes was obtained.

Uchaipichat A.,Vongchavalitkul University
Electronic Journal of Geotechnical Engineering | Year: 2010

Influence of temperature on soil behavior has become an interesting subject in geotechnical engineering area. Generally a thermal effect causes a reduction in strength under undrained condition. Thus, this research is aimed at studying the possibility of the use of cement to improve the soil strength under elevated temperature. A series of unconfined compression tests was conducted under controlled temperature at 25, 40 and 60 degrees Celsius on the samples of cement admixed clay. A strength reduction ratio is introduced to compare a reduction in compressive strength with increasing temperature. The results show an optimum cement content of 10 percent at which a reduction in strength with increasing temperature is minimize. © 2010 ejge.

Uchaipichat A.,Vongchavalitkul University
Electronic Journal of Geotechnical Engineering | Year: 2010

An experimental research program of shear tests is conducted on a compacted kaolin using a conventional triaxial equipment modified for testing unsaturated soils. The modified triaxial cell is capable of independent measurement and control of pore air and pore water pressures at the top and the bottom boundaries of the specimen. The suction values varied from 0 to 300 kPa. The experimental results show the difference in relationships between shear strength and suction for drying and wetting processes. The shear strength predictions using simple failure equations for unsaturated soil in the literature are compared with the experimental results. The predictive capability of the proposed failure equations is discussed. © 2008 ejge.

Uchaipichat A.,Vongchavalitkul University
Electronic Journal of Geotechnical Engineering | Year: 2012

Pile foundations are generally used for structures located on soft clay layer. However, the undrained shear strength, controlling pile capacity, varies with matric suction which fluctuates during seasonal changes. Thus, simulations of variation in pile capacity with matric suction are performed in this paper. The simulations are performed on a pile with diameter of 0.40 m. installed in unsaturated clay layer. The length of pile ranges from 5 to 20 m. The matric suction ranges from 10 to 10,000 kPa. The simulation results show a decrease in pile capacity and factor of safety with decreasing matric suction. The results also show that the factor of safety can be less than unity upon wetting to the low level of matric suction. © 2012 ejge.

Keeratiurai P.,Vongchavalitkul University
ARPN Journal of Engineering and Applied Sciences | Year: 2015

The solid wastes were about 10 to 20 tons / cycle from the mushroom crop factories that were released into the wilderness areas, canal, public swamps or wetlands of the community. The survey to preliminary problems in the Pakthongchai district found that the quality of water in canal near the mushroom crop factories was over the industry wastewater standards. A review of anaerobic treatment of wastewater in high rate anaerobic digestion reactors was presented. Solid wastes of the mushroom crop factories were discharged to be a collection of animal breeding and disease and also have bad smell. Dust and smoke from the burning of wood used as fuel to make the mushroom. As well as problem was global climate changing from greenhouse gases emissions for energy using in the mushroom crop factories. Therefore the any problems should be studied to find solutions to control solid waste treatment, renewable energy to fuel production facility of the mushroom crop factories and the economy evaluation of the biogas plants was a renewable fuel. This study had the four conditions of hydraulic retention times were 3 days, 5 days, 7 days, and 9 days following which the all conditions were controlled system in the range of pH 7.5 ± 0.5 and 25 - 40 °C. The influence of temperature, nutrients and pH upon process performance was evaluated. A pilot-scale of the high rate anaerobic digestion reactor with vertically arranged PVC tubes as biomass carrier, treating the solid wastes of the mushroom crop factories was started-up in 31 days at ambient temperatures between 25 - 40 °C. The start-up process consisted of a long acclimatization phase followed by a low loaded growth phase at which total COD removal efficiencies of 80-90% were achieved. The results showed that the high rate anaerobic digestion reactor could be effective in removing COD are highest were 80.00%. The pH was 7.00 - 7.67 at outlet in the four hydraulic retention times. The ratio of COD: BOD was high as shown that the anaerobic biological process has the potential to eliminate the organic matter in the solid wastes. Most organic compounds containing carbon was the main component to be easily digested by microorganisms. There was a significant organic removal efficiency of the high rate anaerobic digestion tested in terms of TS, DO, COD, N, P, and K (p < 0.05). The maximum biogas production was 4.00 cm3 / day in the hydraulic retention time as 9 days. A summary of this research could to solve problems many aspects of the community. The high rate anaerobic digestion technology reduced to solid wastes and air pollution such as dust, smoke and greenhouse gases from the biogas using as fuel to the mushroom crop factories. Therefore, the factories should reduce emissions from energy consumption such as reduce electricity utilization in factories and reduce the use of firewood for heating in production. The economics evaluation of solid wastes to produce biogas showed that the internal rate of return of this project (IRR) was 17% per year, PI was 1.51, which was greater than 1, this project should be invest and the payback period was 1.33 years. © 2006-2015 Asian Research Publishing Network (ARPN).

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