Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal)

The Strength of Cement Mortar with Industrial Rubberwood Fly Ash

Thaweesak Thongkhwan — 2024-04-30

The objective of this research is to study the strength of cement mortars mixed with industrial rubberwood fly ash. The rubberwood fly ash was used as a replacement for general-purpose hydraulic cement (GU) and Portland cement type 1 (PC) in proportions of 0, 10, 20, and 30 percent by weight of the binder. The water-to-cement ratio was varied to achieve a flow consistency of 110±5. Compressive strength, flexural strength, and tensile strength were then tested. The results of the study indicated that (1) the compressive strength of mortars decreased with the increase of rubberwood fly ash content. However, GU mortar met with a percentage of replacement of 20 percent. For PC mortar, while, the appropriate replacement of 10 percent. (2) the mortars with 10 percent rubberwood fly ash showed higher compressive strength than the control mortars. And, (3) the tensile strength of mortars decreased with the increase of rubberwood fly ash content. In conclusion, the appropriate replacement level for cement with rubberwood fly ash was 10 percent which provided opportunities for future extensions and developments.

The Feasibility of Using Rubberwood Bottom Ash in The Mixture of Interlocking Block

Premmanat Chumprom — 2024-04-30

The objective of this research is to evaluate the feasibility of using rubberwood bottom ash in the mixture of interlocking blocks. The mixtures were conducted including cement-to-aggregate ratios of 1:4, 1:5, and 1:6 by weight. The rubberwood bottom ash was used as the aggregate as same as laterite soil with different percentages of 0, 10, 30, and 50 by weight of aggregates. The mixtures were compacted using a manual interlocking molding machine. When comparing the research data with the community product standard 602/2547, which specifies that the ompressive strength of non-load-bearing blocks must be no fewer than 25 kg/cm², and load-bearing blocks should have a compressive strength of no fewer than 70 kg/cm², and the water absorption should not exceed 288 kg/m³, it is found that all mixtures met the stand for no-load-bearing blocks. While there were three mixtures met the standard for load-bearing blocks consisting of a ratio of cement to aggregate of 1:4 with 0, 10, 30, and 50 percent of rubberwood bottom ash, a ratio of cement to aggregate of 1:5 with 0 and 10 percent of rubberwood bottom ash, and a ratio of cement to aggregate of 1:6 with 0 percent of rubberwood bottom ash.

Development of Screen Inks from Black Soil and Red Soil using Natural Mordant

Pawinee Theamdee — 2024-04-30

This research aims to develop printing ink and optimal conditions for screen printing on cotton fabric using natural colorants from black and red soil. The colorant powder, comprising 10 g, was blended with a prepared printing powder of 40 g at room temperature. Screen printing was conducted on cotton fabric, examining the impact of color-baking durations at intervals of 0, 5, 10, and 15 min at a temperature of 150 ^oC. Additionally, the effects of two different mordants such as Marl and sodium chloride at a 10% w/v concentration, were investigated concerning color fastness during washing, exposure to bleaching agents, sunlight, and abrasion resistance. The results of testing indicated that the cotton fabrics screen-printed with black and red soil colors with baked for 15 min exhibited the best colorants. When Marl was used as a mordant, the colors appeared richer, while sodium chloride produced brighter hues. The mordant from Marl exhibited superior color fastness for cotton fabrics screen printing with black and red soil colors. Furthermore, these colors with excellent durability could be screen-printed on various cotton fabric products.

Development of Mouthwash from Guava Leaf Extract and Maweng Kruea Fruit Extract

Thanyaphat Manud — 2024-04-30

This study aims to test the antibacterial efficacy and antioxidant activity of leaf extract and Maweng Kruea fruit extract and develop a mouthwash product containing extracts from guava leaf and Maweng Kruea. The experiments were conducted by extracting both herbs with 95 % ethanol. Research results indicated that herbal extracts possess inhibitory effects against Streptococcus mutans. The minimum inhibitory concentration (MIC) that can inhibit microbial growth was found at 0.25 mg/mL, while the minimum bactericidal concentration (MBC) for killing bacteria was found at 0.25 mg/mL, with an MBC/MIC ratio of 1. The mouthwash composed of guava leaf and Maweng kruea fruit extracts exhibited antioxidant properties with an IC₅₀of 16.06 μL/ml. The developed mouthwash from these herbal extracts was found to have physical properties suitable for oral use, including a clear yellow color, slightly bitter and slightly sweet taste, minty aroma, slight cooling sensation, no tongue irritation, and a pH value of 6.7, making it suitable for oral conditions.

Effects of Chemical Fertilizer and Bio-Extracts on the Growth and Yield of Butterhead Lettuce in Substrate Culture System

Kanjana Luangsuwalai — 2024-04-30

Butterhead is a type of lettuce that is commonly consumed fresh. Currently, it is popular to grow fresh vegetables using a hydroponic solution system. The objective of this study was to examine the effect of using animal manure extract solutions on the growth of butterhead lettuce, grown in plastic pots using a soil substitute of sand mixed with rice husk charcoal. A randomized trial was conducted, consisting of six treatments: (1) chemical fertilizer (16-16-16), (2) vermicompost extract, (3) swine manure extract, (4) chemical fertilizer alternating with vermicompost extract, (5) chemical fertilizer alternating with swine manure extract, and (6) vermicompost extract alternating with swine manure extract. The results indicated that there are highly significant differences (P<0.01) in the growth (growth in terms of bush width, height, number of leaves, leaf length, and leaf width) and chlorophyll content within treatments. The results of the experiment can be divided into three groups: (1) butterhead lettuce supplied with chemical fertilizer, (2) butterhead lettuce grown with a chemical fertilizer solution alternating with animal manure extract, and (3) butterhead lettuce provided with animal manure extract. A significant difference (P<0.01) was found between the yield of each fertilizer, with the first group producing the most fresh weight of yield when compared to the other groups. The next highest producing yields were from chemical fertilizers alternating with swine manure extract solution, and chemical fertilizers alternating with vermicompost extract solution, respectively

Study of Mechanical and Morphological Properties of Polypropylene Blended with EPDM Rubber Powder from Automotive Door Seals

Sirinthorn Thongsang — 2024-04-30

This research studied the mechanical and morphological properties of polypropylene blended with Ethylene Propylene Dine Monomer (EPDM) rubber powder from automotive door seals. EPDM rubber powder was prepared as non-devulcanized and devulcanized by a thermo-mechanical method. The devulcanization of EPDM rubber powder in the crushing stage on a two-roll mill was studied at 220 °C and 230 °C, and a roller speed of 40 rpm for 25 minutes, and then further mashed in an internal mixer at 200 °C, and a rotor speed of 140 rpm for 10 minutes. Then, the devulcanization ability of the rubber was determined using the Soxhlet Extraction method to select the appropriate temperature. Both types of EPDM powder were mixed in polypropylene (PP) in the ratio of 0/100, 10/90, 20/80, 30/70, and 40/60 %wt. using an internal mixer and molded into a sheet by a hot press. It was found that the rubber devulcanization in the crushing stage on a two-roll mill with a temperature of 230 °C had a higher sol content than that of 220 °C, indicating a better ability to devulcanize. The tensile modulus of PP blends decreased with increasing both types of EPDM rubber powder, while the elongation at break and impact strength increased. The tensile strength tended to decrease when increasing with non-devulcanized and devulcanized EPDM at 30 and 40 %wt., respectively. The addition of devulcanized EPDM into PP gave rather better mechanical properties than that of non-devulcanized EPDM. The reason was that the devulcanized EPDM was a smaller powder and had a good dispersion, resulting in more surface area for adhesion with the PP matrix. In addition, the devulcanized EPDM that was scissored crosslinks became the free molecular chains, leading to a greater compatibility with PP.

The Factors in Rail Transportation Service Considering User Expectation Toward New Normal and Sustainability: Case study Northeastern lines

Narucha Tanaiutchawoot — 2024-04-30

The development of infrastructure and Thailand's transportation is a sustainable development country goal which consists of transportation management development such as transportation management system and service form, Infrastructure such as roads, transport stations, and railway routes. Railway transportation is a main issue in the success of transportation services. And all over the lifestyle has changed. Therefore, this research aims to study the services quality factors of Northeastern lines. The research instrument was a questionnaire. The researcher collected data from a sample group for 600 people and used second-order factor analysis. The result showed that the service quality is measured by vehicle characteristics, services, information, crews and terminal at a statistically significant level 0.01. Therefore, service providers should prepare the information of travel on vehicle and stations, provide the security guard in station, manage getting on and off trains at platform and clean the station regularly.

The Solutions of Diophantine Equation \frac{1^4}{v_1^4}+\frac{2^4}{v_2^4}+\frac{3^4}{v_3^4}+...+\frac{k^4}{v_k^4}=1

Patchara Muangkarn — 2024-04-30

In this paper, we introduce solutions of the Diophantine equation on the following from:
where are positive integer such that and . The results show that there will be only 1 solution when , there will be only 3 solutions when , and there will be at least 4 partial solutions when .