IJOART Volume 9, Issue 10, October 2020 Edition


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THE USE OF PULVERIZED RIVER SAND AS FINE AGGREGATE AND MICRO FILLER FOR IMPROVING COMPRESSIVE STRENGTH OF CONCRETE []


This work was carried out mainly for improving the compressive strength of concrete (fcu). To ensure suitability, samples of river sand were collected from different locations (Abraka, Ughelli, Yenagoa, and Port Harcourt) of the Niger Delta region in Nigeria. Each of the samples was pulverized (grinded) and sieved to collect the 300micron passing aggregates. Using this PRS as fine aggregates, two different prescribed mix ratios of 1:1.5:3 and 1:2:4 batched by weight was used to prepare 204 nos 150mm test cube samples, with a w/c ratio of 0.5 and were removed from the moulds after 24 hours. The cubes so formed were placed in a curing tank and allowed to cure for 7, 14 and 28 days under normal atmospheric temperature and pressure. Two cubes each from the four different locations were cast and cured for; 7, 14, and 28 days for the control of the two mix ratios. Two cubes each were also cast for 7, 14, and 28 days on the different mix ratios for varying replacement percentages (25%, 50%, 75%, and 100%) of PRS from the different sample locations. They were then tested to failure using a Compressive Strength testing machine. The comparison of results obtained from the four locations show that the optimum compressive strength was attained in the PRS from Abraka. A 100% replacement of PRS from Abraka produced 40N/mm2 and 38N/mm2 for 1:1.5:3 and 1:2:4 mix ratio respectively compared to 27.78N/mm2 and 25.56N/mm2 of their equivalent control (0% replacement). The 100% replacement from Ughelli at 28days for 1:1.5:3 and 1:2:4 mix ratio respectively also attained an increased compressive strength of 31N/mm2 and 29N/mm2. The 100% replacement of PRS from Port Harcourt and Bayelsa at 28days for 1:1.5:3 and 1:2:4 mix ratio respectively also attained decreased compressive strength of 19N/mm2 and 18N/mm2 for Port Harcourt and 23.11N/mm2 and 20.9N/mm2 for Bayelsa. Another interesting feature of the PRS from Abraka is that it performs as a Rapid Hardener producing the concrete strength of the control at the 28days in just 7 days. The 42% improved strength of concrete with PRS may be due to its presence as fine aggregate FA and as micro filler MF which made the concrete very compact and impermeable, together with the high presence of silica content in the Abraka and Ughelli river sands.


Diagnosis and Control of Excessive Water Production in Niger Delta Oil Wells[]


This study investigates the diagnosis and control of excessive water production in oil wells in the Niger Delta oilfields. The diagnostic plots derivatives approach was adopted. Production data were obtained from two wells and Prosper was used for the analysis. Chanís model was used for diagnosis and Water Shut-off techniques were used in control of excessive water in the case study fields. The results indicate that there is increase in production when the intervals with excessive water was shut-off and shallower intervals were perforated and monitoring of wells near terminal water-cut. The results revealed that some of the causes of excessive water production in the oil fields are channel casting leaks, open fracturing out of zones, completion in to or near water, barrier breakdown, channeling through higher permeability zones or fractures, and coning and cresting and no proper well surveillance and wells reservoir and facility management in place. For the first well NDZ_A, the initial water-cut of 60% was reduced to 0.3% with a production increase of 412 Bopd and for the second well NKZ_B of initial water-cut of 43% was reduced to 0% with a production increase of 968 Bopd. This study concludes that in hydrocarbon production, often oil produced commingled with water. As long as the water production rate is below the economic level of water/oil ratio (WOR), no water shut-off treatment is needed. Problems arise when water production rate exceeds the WOR economic level, producing no or little oil with it. Therefore, it is necessary that effective evaluation of the intervention procedure is carried out and expected outcome using the production performance data should be encouraged.


The Impact Of Personality Traits On The Business Performance Of The Small And Medium Enterprise In The Gampaha District Of Sri Lanka[]


IN todays, competitive and dynamic environment the number of Small and Medium Enterprises (SMEs) are growing at a rapid rate and some SMEs are facing issues such as underperformance fail the business and so on. Performance of the SMEs depend of different factors among these factors; personal trails of the SME managers had been identified by the researcher. Although based on the practical and theoretical gap, this study examined the influence on personal Traits of the SME owners on the SMEsí Performance in the Sri Lankan context.The study has been conducted the Big 5 Personality Traits Dimensions, namely Extraversion, Agreeableness, Conscientiousness Neuroticism and Openness on the SMEs Performance in the Gampaha District. Hundred and six questionnaires were distributed among the SME managers and sixty-five questionnaires were received from the respondents. Sixty-three complete questionnaires used to data analysis. Descriptive statistics, Correlation and regression analysis were used to data analysis.The results attest to a significant positive relationship between three personality trails namely Extraversion, Conscientiousness and Neuroticism and Business Performance of the SMEs in the Gampaha District. Although, rest of personality traits dimensions could find out relationship with the Business Performance of SMEs.From a theoretical aspect this study contributes to the further development and application of the theories of SME business performance impact from Personality Traits and from a practical point of view, it provides recommendations on what personality traits to prioritize and address to increase the Business Performance of an SME.



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