Open Access Short Research Article

Friction Coefficients of Local Food Grains on Different Structural Surfaces

N. R. Nwakuba, O. C. Chukwuezie, F. C. Uzoigwe, P. Chukwu

Journal of Engineering Research and Reports, Page 1-9
DOI: 10.9734/jerr/2019/v6i316951

Knowledge of friction coefficient of agricultural commodities on various structural surfaces is imperative in the design and material selection for postharvest handling, transportation, processing and storage equipment. This paper presents the friction coefficients of local food grains on different structural surfaces as a function of moisture content. The experiment was conducted using a Complete Randomized Design (CRD) in a factorial treatment design to evaluate the influence of different structural surfaces (glass, mild steel, plastic, ply-board, and aluminium) and moisture content levels (6, 12, 18, and 24% wet basis) on the coefficient of friction of selected local grains (benniseed, finger millet, pearl millet, and hungry rice). Results obtained indicate that the friction coefficient (μ) of the studied grain samples increased linearly with increase in moisture level for all the tested structural surfaces. Within the range of the studied moisture content, benniseed exhibited the highest μ-value (0.526 ± 0.031 ≤ μ ≤ 0.784 ± 0.157) on ply-board, whereas hungry rice had the lowest value (0.248 ± 0.018 ≤ μ ≤ 0.527 ± 0.023) on glass material. Amongst the tested metal surfaces, aluminum had the lowest μ-value (0.236) at 6% moisture content. The effect of structural surfaces and moisture contents as well as their interactions on friction coefficient were statistically significant at P =.05 for all the studied grain samples. High values of correlation coefficient (R2) > 0.95 were obtained to indicate strong correlation between μ-values and experimental factors. A low coefficient of variation (CV) of 2.75% was obtained to show high experimental reliability.

Open Access Original Research Article

Correlation between Swelling Pressure and Free Swell of Greater Cairo City Expansive Soils – A Case Study

Nasser A. A. Radwan, Khaled M. M. Bahloul

Journal of Engineering Research and Reports, Page 1-6
DOI: 10.9734/jerr/2019/v6i316948

The aim of this research is to investigate experimentally the relationship between free swell, plasticity index of expansive soil found in greater Cairo City Suburbs, Egypt with swelling pressure of mentioned soil. Predicting Swelling Pressure of any soil is a time consuming and expensive test in comparison to determining plasticity index and free swell which are simple, fast and economic tests. In present research six samples of expansive soil were collected from different locations of study area. The method uses single variable and multiple variable regression analysis using Microsoft excel software.

Open Access Original Research Article

Design of Normal Concrete Mix Based on Both Building Research Establishment and American Concrete Institute Method of Mix Design

A. S. Adewuyi, K. H. Lasisi

Journal of Engineering Research and Reports, Page 1-7
DOI: 10.9734/jerr/2019/v6i316950

To achieve a defined workability, strength and durability in construction works, concrete mixes are designed and this is done towards the selection and proportioning of constituents to produce a concrete with pre-defined characteristics both in fresh and hardened states. This study assesses the design of normal concrete mix based on the American Concrete Institute and Department Of Environment methods of mix. A characteristic strength of 20 N/mm2 was designed for using the two mix design methods. The concrete components used were tested for specific gravity; moisture content, particle size distribution, aggregate impact value, aggregate crushing value, slump test and compacting factor test and were found suitable. Two sets of concrete cubes (150 x 150 x 150 mm) each were cast using two mix designs. Compressive strengths were evaluated at 7, 14, 21, and 28 days of curing. The 28th day strengths of the two sets of concrete were found to be 30.5 N/mm2 and 29.5 N/mm2 for both DOE and ACI mix design methods which did not exceed the calculated targeted strength.

Open Access Original Research Article

The Design, Construction and Testing of an Intelligent Device for Coating Flaws and Crack Detection in Pipelines

A. R. Lana, N. Idusuyi

Journal of Engineering Research and Reports, Page 1-13
DOI: 10.9734/jerr/2019/v6i316952

The major pollutant induced by pipeline failure in Oil and Gas industry has been mitigated over the years using non-destructive techniques like liquid penetrant, magnetic particles, radiographic, ultrasound and eddy current testing. The eddy current technique’s advantage over the other testing devices remains the best suitable in the design and construction of the devices due to the nature of the pipeline materials. For this present work, a pre-test-post-test experimental design was used to test devices on a defect free pipe and a pipe with machined defects of known dimensions and different orientation (longitudinal and axial) after construction. The defect detection was done using electromagnetic technique of eddy current by exciting a coil with power supply and placed close to the tested pipe surface, as a micro-controller was used to track the irregularities on the material surface by computer systems. The device set up for the test was a coil with a power supply of a DC battery connected with micro-controller of a quantization level of 4.88mV. For visual display, result obtained indicates no variation in the amplitude of the pulse as demonstrated by a pipe with no defect while variations (deeps) occurred in the pipe with defects as the coil was traversed over the defect. The orientation had no significant effects on the sensitivity and effectiveness of the device. Results validation was done using a non-destructive technique by visual inspection. Thus, device has shown its effectiveness in detecting defects irrespective of the orientation. Similarly, the size of the defects is a determinant in the amplitude variation of the pulse displayed which implies at higher sensitivity, a high frequency is required. 

Open Access Original Research Article

SPAMAST Smart Garbage Bin Monitoring System Using Wireless Sensor Network

Christopher M. Padal Jr, Mary Jean May L. Salado, Noel P. Sobejana

Journal of Engineering Research and Reports, Page 1-16
DOI: 10.9734/jerr/2019/v6i316953

The main objectives of the project was to develop a monitoring system that displays the real-time level of the garbage inside the garbage bins using the ultrasonic sensor, a module the notifies the admin when it reached the maximum level of the garbage’s inside the garbage bin that automatically opens using servomotor  and laser sensor after detecting the objects nearer and automatically notify the users of the garbage level when the garbage bin is already full, and to capture the level of effectiveness in terms of functionality, reliability, usability, efficiency, maintainability and portability. The research locale of the project was the SPAMAST-DIGOS Campus. The system development method used by the project-developers was the modified-waterfall approach. The project team used Visual Studio 2012 as front-end and Text File as the back end of the system. Asp.Net was used for designing the user's interface. Using these applications, the project team created a Desktop Application that displays the level of the garbage inside the garbage bins which could be graphed. The result of the test taken from students, faculties, staffs and IT expert was 4.75 as the overall weighted mean which means excellent.