Journal of Engineering and Innovation

Effects of air void characteristics on compressive strength of cellular lightweight concrete

Kaewta Deeyingsirikul, Griengsak Kaewkulcha — Wed, 27 Aug 2025 00:00:00 +0700

Cellular lightweight concrete is produced by uniform distribution of air bubbles made from preformed foam throughout the mass of concrete in substitution of coarse aggregates. The properties of cellular lightweight concrete are depended on density or foam volume, when the concrete hardens was to become pore system inside. That, it is a very
significant characteristic affects to strength, durability and thermal conductivity. This paper presents the effect of foaming agent types to air void size of cellular lightweight concrete with a wet density of 1,800 kg/m3 using sand to cement ratios
of 2:1 and water to cement ratios of 0.65. At this density, the concrete specimens were used three types of foaming agent and used three different foaming agents to water ratios of 1:20, 1:30 and 1:40. To producing preformed foam by foam
generator used pressure at 4.5, 5.0, and 5.5 kg/cm2 and the concrete specimens were used air dry curing method for 28 days. It was found that when porosity was increased, the air void size at D90 and air void size distribution ranges were increased resulting in a decrease of compressive strength. SPAN (Sp) was used to identify the difference in air void.

Development of an electronic document system for managing student project data using google data studio

Wed, 27 Aug 2025 00:00:00 +0700

In today’s digital age, organizations are increasingly transitioning from traditional paper-based document management to electronic document systems. This research aimed to design and develop an electronic document system for managing student project data in the Industrial Engineering program by applying Google Data Studio. A survey revealed that the current storage space for student theses in the Industrial Engineering program is limited, and the existing storage system is not very efficient. Additionally, the system is cumbersome and time-consuming for searching data. To address these issues, improvements were proposed by creating an electronic document system using sample student projects from the academic years 2018 to 2022. The system applies information technology, specifically Microsoft Excel linked to Google Data Studio, as a tool for storing and retrieving data, to retrieve data from a database and create a dashboard that displays all details in one place, presenting the information in a visual format. The results showed that transitioning from the traditional storage and retrieval system to the new online system significantly reduced the average time required for searching student projects. The average search time decreased from 192 seconds per thesis to 36.5 seconds per thesis, representing a time reduction of 80.99%. Moreover, the satisfaction evaluation conducted with a sample group indicated a high level of satisfaction with the system, with an average score of 4.27 out of 5. This electronic document system provides an effective solution for managing student project data and serves as a prototype for further improvement and development.

Prioritizing risks affecting the optimal safety stock levels using the analytic hierarchy process: A case study of a brake pad manufacturing plant

Sasikarn Klomwattanakun, Noppakun Sangkhiew, Peerapop Jomthong — Wed, 27 Aug 2025 00:00:00 +0700

This research Prioritizing Risks Affecting the Optimal Safety Stock Levels Using the Analytic Hierarchy Process (AHP) to assess the weight of each risk factor in inventory risk management. The main objectives of the research are: (1) to study the risks that affect safety stock levels and (2) to prioritize the importance of the risks impacting safety stock levels. The results, gathered through questionnaires from experts involved in chemical raw material management at the plant, reveal that raw material quality risk has the highest impact on safety stock levels, accounting for 29.25%, followed by the risk of raw material criticality at 23.12% and price risk at 14.03%. These are the most significant risks among the 7 categories examined. A limitation of this study is that it focuses solely on chemical raw materials in the case study plant, which may not apply to other raw materials. However, the findings can be used to plan and improve chemical raw material inventory risk management effectively, reduce the risk of shortages, and enhance operational efficiency.

Ceramic glaze development by utilizing waste materials: Calcium Carbonate and Glass Cullet

Wed, 27 Aug 2025 00:00:00 +0700

This research aimed to develops ceramic glaze by utilizing waste materials from the industrial sector. Calcium carbonate; by product from the sugar mill process has been selected. Glass cullet is also employed for reducing firing temperature of ceramic glaze. Three main materials used in this study consist of green glass cullet, clear glass cullet, and calcium carbonate. In addition, feldspar was used for comparing with cullet as reducing firing temperature. And local white clay was exploited as the bonding material of body surface. The 32 formulas were conducted for the preliminary experiment. They were kneaded and made cone shaped by hand. Then, they were fired at 1,100 ºC and 1,150 ºC with heating rate 100 ºC/h and soaking for 1 h. After the firing process, 10 glaze formulas which melted were selected for further investigation. Their compositions were modified by adding calcium carbonate again with the ratio 8.33, 7.70, 12.00, 11.11, 15.38 and 14.28 wt. % and then fired at the same temperature as the first experiment. The properties of fired specimens consisting of fluidity and coefficient of thermal expansion have been investigated. It was found that the optimal temperature is 1,100 ºC. The formula 1B, 2B and 5B have the optimal fluidity. Owing to this research aimed to develop glaze coating on Angthong clay tile, coefficient of thermal expansion of 3 glaze formulas and Angthong clay have been tested. Thermal expansion of all formulas was slightly greater than that of the base. The optimal formulas 1B and 2B had been proposed which could be used as ceramic glaze of Angthong clay tile. The composition of formula 1B consisted of clear glass cullet, white local clay, and calcium carbonate, 80, 8 and 12 percent by weight, respectively. While, the formula 2B consisted of green glass cullet, white local clay, and calcium carbonate, 80, 8 and 12 percent by weight, respectively.

Development of a web application for traffic management during the illuminated boat procession festival in Nakhon Phanom

กฤชณัท รวมบุญ , Chalermchat Theeraviriya — Mon, 01 Sep 2025 00:00:00 +0700

This study aims to (1) design and develop a web application for traffic management during the Illuminated Boat Procession Festival, (2) evaluate the performance of the developed web application, and (3) assess user satisfaction. The Illuminated Boat Procession Festival attracts a large number of tourists, but the rapid growth of tourism presents significant challenges in managing traffic in high-density areas. A review of previous research indicates that although technology has been employed in traffic management, no web application has been specifically developed to address the complex travel patterns and spatial constraints of festival traffic. This study addresses this research gap by developing a web application with three key components: parking areas, festival viewing locations, and taxi services. These components work together to allow users to conveniently select parking spots, navigate efficiently to festival viewing areas, and access taxi services seamlessly. The system's performance evaluation revealed that the web application accurately displays real-time traffic information and effectively supports a large number of users without disruption. The overall user satisfaction assessment indicated a high level of satisfaction, with an average score of 4.12. Users reported that the web application enhanced travel convenience, alleviated traffic congestion, and improved travel planning efficiency. Additionally, they expressed satisfaction with the ease of accessing information and the user-friendly interface of the system. This study is significant in developing a web application model that can be applied to traffic management in festivals or large-scale events characterized by complex traffic conditions and a high number of participants. The model can also be adapted for use in other areas with similar traffic patterns in the future. Furthermore, efficient traffic management plays a crucial role in reducing pollution caused by traffic congestion and contributes to broader efforts toward building a more sustainable society.

Effect of electronic waste fiber on the properties of self-compacting mortar incorporating waste glass as fine aggregate replacement

Jutatip Roopchalaem, บุรฉัตร ฉัตรวีระ, Gritsada Sua-iam — Mon, 01 Sep 2025 00:00:00 +0700

The construction industry is recently turning towards sustainability by incorporating recycled materials to reduce environmental impacts. This paper presents the development of green self-compacting mortar (SCM) using E-waste fiber, waste glass, and cement replacement materials (calcium carbonate and silica fume). The effects of these materials on flowability, mechanical properties, and durability were evaluated. Fifteen different mixes of SCM were prepared, incorporating 0–15% E-waste fiber, 0–50% waste glass as replacement for sand, and 10% cement replacement (5% calcium carbonate and 5% silica fume). Flowability was evaluated by mini slump flow and V-funnel tests. Compressive strength and flexural strength tests were carried out at 7, 28, and 91 days. Durability tests such as water absorption and sulfate resistance were performed. In these results, 5% E-waste fiber gave the best performance, with a compressive strength of 51.63 MPa and a flexural strength of 5.26 MPa at 91 days. Cement replacement improved the densification of the matrix, reducing water absorption to 2.38% and enhancing sulfate resistance with very minimal mass loss. Higher contents of fibers, such as 10% and 15%, along with 50% replacement with waste glass, resulted in detrimental effects on workability and durability due to increased porosity. A combination of 5% E-waste fiber, 10% cement replacement, and up to 25% waste glass replacement is recommended in the production of SCM, which shows balanced properties for sustainability. This research results show the feasibility of producing eco-friendly high-performance mortars with recycled materials.

Development of rubber seed sheller using the principle of centrifugal stone cone model

Mon, 01 Sep 2025 00:00:00 +0700

This research was aimed to develop a rubber seed sheller based on the principle of stone cone centrifuge. The study method consisted of designing, constructing, and testing to find the most suitable operating factors. The rubber seed sheller consisted of sheller and sorting sets. The sheller set was in the form of two stone cones equipped on the top and bottom with 1 hp., 220 volts electric motor. The sorting set used air as a separator and was driven by 1/4 hp., 220 volts electric motor. The assessments were conducted to optimize the most suitable distance between the sheller heads, the angle of the sheller heads, the rotational speed of the sheller head shaft and the wind speed for sorting. The results revealed that the sheller could shell the rubber seeds with the shell included seed size of w x l x t 21.02x23.35x16.25 mm. and the middle seed size of 15.70x19.20x12.75 mm. The highest shelling efficiency at 100 percent was obtained from the distance between shells was 17 mm., the angle of shell was 30 degrees, and the speed of shells were 90, 110 and 130 rpm. Moreover, the shelling efficiency at 88 percent was observed at the distance between shells was 19 mm., the angle of shells was 60 degrees, and the speed of shells was 90 rpm. The wind speed at 7.5 m/s was the highest separation efficiency at 62.44 percent. This sheller could shell at the capacity of 60 kilograms per hour. Rubber seeds contain approximately 50% oil which can be extracted for various uses such as being an ingredient in the production of plastic product, natural fuel, and livestock feed. Hence,

Determining the optimal factors for forming containers from pineapple leaves using full factorial design of experiments

Tue, 02 Sep 2025 00:00:00 +0700

This study aims to determine the optimal factors for molding containers from Pattawia pineapple leaves using a 2³ full factorial design and evaluating the physical property of water leakage resistance. It builds upon previous studies that did not specify a precise material ratio. The experiment investigated three factors affecting the molding process: the ratio of pineapple leaf fiber to binder, molding temperature, and molding pressure. Each factor had two levels, and the experiments were repeated three times at a significance level of 0.05 Minitab software was used for experimental planning and result analysis, focusing on the main effects and interaction effects of the three key factors. The purpose was to verify the statistical significance of these factors the results showed that the optimal conditions for molding containers from pineapple leaves were a 1:1 fiber-to-binder ratio, a temperature of 130°C, and a pressure of 8 bar, which provided the best resistance to water leakage. Statistically significant factors affecting water leakage resistance were the fiber-to-binder ratio (A) and the interaction between temperature (B) and pressure (C). A reduced regression model was developed as =89.58 + 59.42 A – 13.00 B + 13.83 C – 28.08 B×C The R² value of 73.11% indicates that the regression model satisfactorily explains the variance in the data.

Cognition towards the goals of overtime work in construction project: A case study of the condominium construction project

Pichet Sooksaksun — Tue, 02 Sep 2025 00:00:00 +0700

Overtime work can be implemented in situations where construction projects require accelerated operations. The achievement of the operation can be influenced by the worker's cognition. This study aims to explore the attitudes of workers who assign overtime work and the workers who work overtime in order to assess their opinions towards the goal of assigning overtime work in the case study of the condominium construction project. The differences between the opinions of each group of workers were compared using the Mann-Whitney U statistical test. The test results could reflect the overtime workers' cognition on the goal of performing overtime work. The statistical test results indicated that 10 out of 12 goals had consistent opinions by both groups of workers at a 95 percent confidence level, with the purpose of avoiding the inspection and evaluation of the workers’ performance being found inconsistent. The discussion results concluded that the overtime workers had cognition consistent with overtime assigners that the project should benefit from this choice of operating approach. This approach can be employed to cope with situations where the project’s resource shortage, improve the efficiency and effectiveness of operations in both short term and long term, and manages and administers the project and the worker units. With the perceived cognition that workers have, the implementation of the projects where managers or organizations that may require overtime work can confidently choose this approach through clear communication with workers.

Mathematical model for production planning : A case study of a wheat flour factory for instant noodles

Tue, 02 Sep 2025 00:00:00 +0700

This research studies aggregate production planning for wheat flour production to minimize costs. The four forecasting techniques are the weighted moving average method, simple moving average, exponential smoothing at and double exponential smoothing method at . Along with finding the mean absolute deviation (MAD), mean square error (MSE), and mean absolute percent error (MAPE). It was found that the methods for forecasting sales in 2022 and 2023 using the exponential smoothing at and are the appropriate methods respectively. Regarding aggregate production planning three heuristics are used level production strategy, chase Strategy, and mixed strategies. In addition, a mathematical model was developed using linear programming for production planning, and answers were found using microsoft excel. The results show that the solver function can calculate the lowest overall cost as specified in the conditions. Overall cost calculation results are less than the overall cost compared to the actual data for 2022, The 2022 forecast value and the 2023 forecast value decreased by 0.41%, 0.77%, and 0.87%, respectively.

Bending and shear behavior of reinforced concrete beams with circular openings

Tue, 02 Sep 2025 00:00:00 +0700

The main purpose of this research is to design and to study the effects of reinforced concrete beams with opening (no greater than 40 % of depth beam) to strength, and failure. Six sample beams with span length 3.00 meters were tested: 1) ACI-318-11 ’s beam; 2) E.I.T.(2564) ’s Code beam; 3) beam with small circular opening upper neutral axis, in the case of pure bending; 4) beam with small circular opening under neutral axis beam in the case of pure bending; 5) beam with small circular opening upper neutral axis beam in the case of combined bending and shear; and 6) beam with small circular opening under neutral axis, in the case of combined bending and shear. The results showed that the samples 3 and 4 yielded safety load capacity which exceed ultimate design strength and the failure is similar to the samples 1 and 2. Similar results are obtained from sample 5 and 6. However, diagonal crack started from the bottom of the beams 4 and 6 toward the center of opening.