iosr-JMCE   Volume-18 ~ Issue-5 ~ Sep. – Oct. 2021

Abstract: Thermalelectricalgeneration power plant isoneofthemajor power generation plant methodsusedinNigeria to generate electricity both locally and internationally. But dueto inconsistency, failure and low power supply in Nigeria, there is a call for a proper operation and maintenancestrategyofthevariouskindsofpowerplantsaccessoriessoastofacilitatetheir efficiencies, sustainability andfunctionality.Calabarthermal powerstation,whichisoneofthemajorpowergeneratingstationsinNigeria was used as a case study. The station has an installed capacity of 561MW consisting of 12 units of 46.75 MW each. It is in the generating sector of the Calabar Electricity Distribution Company (CEDC) which is the state owned Electric Power company.The majorcomponentsofCalabra.....

Key Word: PowersupplyinNigeria,steamturbine,thermalstation,operationandmaintenance of thermalstation.

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[4]. Harmon,R.A.(2008)ThekeystoCogenerationandCombinedCycles.MechanicalEngineering, Feb. 2008, pp64-73.
[5]. HaywoodR.W(1995).AnalysisofEngineeringCycles,PublishedbyPergamonPress,Oxford. http//:www.wikipedia.org/powerstationhttp//:www.wikipedia.org/steam turbine

Abstract: Vertical expansion, few land and small space available in construction make the high rise building (HRB) the most effective solution. HRB is special structure behave with different conduct under seismic excitation.Soil structure interaction (SSI) be more effective under earthquake load. Two approach of the soil models used to represent the soil effect on the structure to check the accuracy of each model in the representation of soil under dynamic loads. The SSI is the most effective parameter in design HRB whatever the type of foundation, the medium soil characteristics are widely spread. Raft foundation for HRB is the best foundation solution for such special buildings. SAP2000 program used to show the effect of SSI in HRB under seismic excitation. Three effective actions under earthquake are occurred: 1) large displacements, 2) high values of damping, and 3) low values of straining actions. In medium soil the straining action reduced by 55% than the fixed model, but the displacement the most effective parameter which gauged the collapse damages in HRB are very high, and the most effective soil model was the elastoplastic model which the soil was modeled as spring and dashpot..

Key Word: earthquake loads; HRB; SSI; straining action; SAP2000; seismic analysis; safety analysis

[1]. Mughieda O, Mehana M S, and Hazirbaba K, 2017, "Effect of soil subgrade modulus on raft foundation behavior", MATEC Web
of Conferences 120, 06010 (2017).
[2]. Jeong S, Park J, You K, 2017, "Analytical Method of Mega Foundations for High-Rise Buildings", Proceedings of the 19th
International Conference on Soil Mechanics and Geotechnical Engineering, Seoul 2017, pp. 2789- 2792.
[3]. Mahajan S., 2014, "representation of equivalent soil spring under a raft foundation", Master, Indian institute of technology,
Roorkee, Roorkee..

Abstract: This study has been conducted to ascertain the usability potential of demolished concrete materials as a replacement for coarse aggregate in concrete. Demolished concrete was obtained from beureau of History and culture, Sokoto from the exhumed underground manhole during open drain construction in march 2021. Crushed into appropriate sizes, sived and washed;, it was used in replacing coarse aggregate in concrete in the various percentages of 0%, 5%, 10% and 15% respectively. A total of forty-eight (48) cubes were produced and were tested for compressive strength at 7, 14, 21 and 28 days of curing. It was observed that the strength of all the percentage replacement rises progressively through the curing period, with 5% replacement having 16.13N/mm2 at 28 days and 15% replacement having 14.0N/mm2 at 28 days. It was concluded that demolished concrete materials are still suitable for use as areplacement for coarse aggregates in concrete but 5% replacement has been recommended for suspended members while 10 and 15 % can be employed for foundations and walls

Key Word: Demolished concrete, Compressive strength, Curing period

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[2]. Anagha K. And Naik S. M. (2015).Use Of Demolished Concrete Wastes As Coarse Aggregates In High Strength Concrete Production. International journal of Research and Technology(IJERT) Vol. 4 Issue 07
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Abstract: Low energy building is a challenge for the developing countries. Due to lack of knowledge of the professionals about the low energy building is a barrier to construct low energy buildings. So to make understand the difference between a conventional building and converted low energy building in this study taken a model and applied different changes. On the same building and by simulation extracting the result so that the professionals and as well as the developer, contractor to understand the difference.

Key Word: low energy building, sustainable development, construction management, site management, energy evaluation, case study

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Abstract: The research aimed at assessing the compressive strength of open air burnt bamboo leaf ash blended cement concrete, to determine the effect of curing age on compressive strength of bamboo leaf ash and to determine the effect of percentage replacement of cement with bamboo leaf ash on compressive strength of bamboo leaf ash blended cement concrete. In achieving this aim, dried bamboo leaf was collected and burnt completely to ash in an open air. The required percentages of the Bamboo leaf ash (BLA) of 0%, 10%, 20%, 25%, 50%, 75% and
100% respectively were used to replace Ordinary Portland Cement partially in cement mix ratio 1:2:4. Three specimens were prepared for each curing days for the entire mix ratio. The types of aggregate used are sharp sand and crushed granite of 19mm size. The combination of these materials was used to cast eighty four (84) concrete cubes of size 150mm x.....

Key Word: Compressive strength, air burnt, bamboo leaf ash, blended cement, curing

[1]. Olanrewaju S.B.O., Okedare D.K.O. and Fagbohun, J.O. (2021): Prospect of Low-Cost Housing Delivery for Middle Income Earners in Nigeria. The International Journal of Engineering and Science (IJES), Volume 10 Issue 7 Series I, PP 48 -54. ISSN (e): 2319-1813 ISSN (p): 20-24-1805 DOI:10.9790/1813-1007014854 www.theijes.com
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[4]. Utodio N. F., Ekandem E. S., Egege C. C., Ocholi M., Atakpu O.D., and Nwaigwe D.N. (2015). Investigation of the Effect of Bamboo Leaf Ash Blended Cement on Engineering Properties of Lateritic Blocks. Journal of Sustainable Development Studies ISSN 2201-4268 Volume 8, Number 1, 2015, 193-208.
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Abstract: Road transportation system is considered as major component of the infrastructure in any country, it affects the developments in economy and social activities. Retention of acceptable serviceability and
performance of asphalt concrete roads during the design life is highly dependent on long term monitoring of the road surface condition, and implementing the right decision to start the maintenance, and the right maintenance alternative at the right time. Asphalt Concrete Road is a multi-layer system that distributes the vehicular and pedestrian loads over a larger area. It helps to make them durable and able to withstand traffic and the environment. Pavement consists of three basic layers the first layer is Sub grade (Gravel) which is the foundation layer, the second....

Key Word: Asphalt Concrete Roads (ACR), Distress Management (DM), Earth Moving Operations (EMO), Present Conditioning Rating (PCR), Crack, Pavement distress, road maintenance, Pavement deterioration, Hot
Mix Asphalt (HMA)

[1]. Abubakar, S., 2016. Bituminous Pavement Failures. Journal of engineering research and application. 6 (2). P. 94-100.
[2]. Adefemi, B. & Ajibola, I., 2015. Flexible Pavement Assessment of Selected Highways in Ifelodun Local Government, Ikirun-Osun, South – Western, Nigeria. International Journal of Engineering and Technology. 5(8). P. 475- 484.
[3]. Adlinge.S.& Gupta.P. 2013. Pavement Deterioration and its Causes. Journal of Mechanical & Civil Engineering. 2278(1684).P. 9- 15.
[4]. Al Harthy, S., 2017. Steps of construction the internal road. [Interview]. 20th April 2017
[5]. AL Naabi, N., 2017. the tests conducted during road construction. [Interview]. 10th may 2017