https://dspace.rmutk.ac.th/jspui/handle/123456789/2397 2026-04-14T18:48:25Z https://dspace.rmutk.ac.th/jspui/handle/123456789/3155 Title: Renewable by Fine Aggregate in Block Cement Authors: ณรงค์ เฉลิมวัฒนชัย Abstract: The purpose of this research is to produce a high strength street-paving block. It enables to Compression Strength and to take the waste material from laboratory to recycle being a new one by Mortar Mold (size 5 x 5 x 5 cm.). It is used to compensate the Replacement Material for Fine Aggregate for two type that are Powdered Lightweight Concrete and Granite Dust to mixed by the designed ratio (increase/decrease for 10 percentages of Replacement Material for Fine Aggregate) for nine ratio. The duration of curing concrete for all of the periods of time are 7, 14 and 28 days. That is each period in 30 block to compare each category of Replacement Material for Fine Aggregate which is Powdered Lightweight Concrete and Granite Dust (only) for 3 samples by Mortar Mold and period of time at the same time. This is found that the ratio between cement : Powdered Lightweight Concrete mixed with the Granite Dust : water with a ratio percentage of Powdered Lightweight Concrete against the Granite Dust to be 50 : 50. It can be Compression strength to be 122.52 ksc. at 28 days curing time is most suitable for street-paving. 2018-01-01T00:00:00Z https://dspace.rmutk.ac.th/jspui/handle/123456789/3154 Title: Development of Energy Saving Stove for Community Authors: สุปราณี วุ่นศรี; พวงทิพย์ แก้วทับทิม; นุชลี ทิพย์มณฑา Abstract: The objective of this research was to develop biomass stove using agricultural residue to reduce fuel cost for farmers and to recycle waste from agriculture to fuel. The research consisted of the design of the biomass stove which modified based on the model used in the villages e.g. Khanoom Jeen making stove. The agricultural residues including husk and saw dust were tested as fuel source. The designed biomass stove was up draft flow type. The stove body was made from the mixtures of cement : sand : stone with 5 different ratios; A (3 : 1 : 3), B (2 : 2 : 3),C (2 : 3 : 2), D (3 : 2 : 2) and E (3 : 3 : 1). Plastering material was prepared from clay: husk ash at three ratios; F (1 : 1), G (2 : 1) and H (1 : 2). The thermal tolerant property was tested and found that the stove body with ratio B gave the best thermal tolerant at 800 ℃ for 1 hour. The three plastering ratios gave similar thermal tolerant property at 800 ℃ for 1 hour. This optimum mixture was used for making the stove with the size of 0.20 m diameter and 0.70 m height. The volume of the stove was 0.10 m3 and the average efficiency of the stove was 39.82% and this was similar to community biomass stove 40.82%. 2018-01-01T00:00:00Z https://dspace.rmutk.ac.th/jspui/handle/123456789/3153 Title: Study of Energy Fuel Briquettes production from Sawdust of Rubber Wood and Animal Dung Authors: สุปราณี วุ่นศรี; วราวุฒิ ดวงศิริ; นุชลี ทิพย์มณฑา Abstract: The study of energy fuel briquettes production from rubber wood saw dust and animal dung aims to investigate the optimum ratio of agricultural waste and livestock waste to produce energy fuel briquettes for the community. Physical and fuel properties of 3 animal dungs were also tested e.g. cow, buffalo and goat dung. The dungs were extruded with tapioca starch as a binder. The ratio of rubber wood sawdust: dung : tapioca starch was investigated for 10 ratios. The results showed that the humidity, ash content, volatile compounds, fixed carbon, density and calorific value were in the range of 2.81 - 4.89%, 1.94 - 22.00%, 55.42 - 93.60%, 11.15 - 71.48%, 1.15 – 1.51 g/cm3 and 3,294.29 – 3,884.48 cal/g, respectively. The ignition time of the fuel was in the range of 6.28 - 11.70 min. The combustion time was 40.90 - 82.89 min and the combustion rate was in the range of 1.17 - 1.80 g / min. Economic cost analysis results showed that the payback period was 109 days. The major factor affecting the return of the project was the price of machinery, amount of fuel produced and the production time. 2018-01-01T00:00:00Z https://dspace.rmutk.ac.th/jspui/handle/123456789/3152 Title: Composition of Aerosol Particles in the Air on Thala Laung Road Muang District, Songkhla Provice Authors: วราวุฒิ ดวงศิริ; สมบูรณ์ ประสงค์จันทร์; ณิชา ประสงค์จันทร์ Abstract: This study was investigated the composition of aerosol dust particles on Thala Laung Road, Muang District, Songkhla province by collecting dust samples in the air by filtering air through the filter paper and analyzing dust particles by using the Elemental Mapping Analysis with Electron Microscope (SEM) and Electron Particle Analysis Microanalysis - Qualitative Analysis. The results revealed that the size of the particulate matter detected was PM10 and the elements of particle composition were consisted of Carbon (C), Oxygen (O), Sodium (Na), Magnesium (Mg), Aluminum (Al), Silicon Sulfur (S), Chloride (Cl), Potassium (K), Calcium (Ca), Titration (Ti) and Iron (Fe). The amount of collected dust was at 7.72-108.02 microgram per cubic meter (μg/m3). It was lower than the standard level of 120 micrograms per cubic meter (μg/m3), and it did not affect the health. From the constituent particulate matter, the particulate matter is derived from the seawater dust, transport and combustion including the vehicles’ brakes directly caused the aerosol dust with iron and magnesium. Therefore, the analysis of dust particles with this technique can be determined the type of elements. 2018-01-01T00:00:00Z