iosr-JMCE   Volume-20 ~ Issue-1 ~ Jan. – Feb. 2023

Abstract: The use of clay soil subjected to thermal treatment at 800oC to produce calcined clay as partial replacement for ordinary portland cement in production of high performance concrete was investigated in this paper. Proportioning of concrete mixes was carried out as per BS 5328: Parts 1, 2, 3 and 4, 1997 and based on the optimum packing density of aggregates, using calcined clay and superplasticizers as admixtures. Calcined clay contents of 5%, 10%, 15% and 20% by weight of ordinary portland cement was used for the concrete specimens preparations with a 0.28 water cement ratio. Strength development of the concrete produced was investigated.Results showed that at 91 days, replacement level of 10 percent produced the maximum compressive strength value of 71.14N/mm2, hence the use of up to 10% calcined clay replacement for ordinary portland cement content in production of high performance concrete for most effective compressive strength development was recommended.

Keywords: Calcined clay, High performance concrete, Compressive strength

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Abstract: Cogeneration is one of the processes that allows us to directly face two of the main problems of both industry and society, which are: the generation of greenhouse gases and the high economic uncertainty produced by volatility in the energy market and the complexity of supply chains. Cogeneration allows connecting two or more independent processes, to better take advantage of primary resources, which translates directly into increases in efficiency and reduction of fuel requirements, impacting on the reduction of pollutants and economic uncertainty, unfortunately the high investment costs discourages many entrepreneurs and investors from acquiring this type of technology, that is why a non-deterministic method is required to efficiently limit the variabilities of cogeneration plants.......

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Abstract: A library is a reservoir of knowledge and is a store for the most vulnerable of man's creation and Ideas. The services of the public library cannot be overemphasized as a society which is known for reading is also known for advancement in various facets and ultimately is a literate society. The library in recent times has extended its services to not just preservation of knowledge in book form, but has also extended to the digital format which cannot rot or decay. However, the major reason for this project is to provide a sustainable modern state library in Enugu state to enhance the minds of the individuals within and without the state, to also serve the socio-cultural needs of the society. In the course of this research, problems which are linked to architecture will be encountered and steps........

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Abstract: Geopolymer Concrete (GPC), an innovative material characterized by long chains or networks of inorganic molecules, is made from by-product materials rich in Silicon (Si) and Aluminium (Al). Si and Al are chemically activated by a high alkaline solution to form a matrix that binds the loose, coarse and fine aggregates, as well as other un-reacted materials in the mixture. GPC depends on thermally activated natural material, it can be industrial by-products materials, such as fly ash or ground granulated blast furnace slag, or kaolinite, to provide a source of silicon and aluminum. They are, in turn, dissolved in an alkaline activating solution, and polymerizes into molecular chains to create the hardened binders........

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Abstract: Over time, there has been an increase in technologies and research, as well as the development of human experience in science. In this context, the aspect focused on population growth, particularly in the city of Luanda (capital of Angola) has provided an intense exploration of urban spaces, in order to dispose and/or accommodate populations and, consequently, buildings, which tend to become increasingly taller slender and/or flexible. Wind standards are part of the foundation of this process, and must be constantly checked and compared, in order to design, monitor and build safer buildings, resistant to different static and dynamic loads. Thus, with the aim of evaluating the dynamic effects of wind load under tall reinforced concrete buildings, this research work also aims to analyse the static and dynamic behaviour.......

Key Word: Tall buildings; Reinforced concrete; Wind load; Structural analysis; Dynamic effect.

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