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Item Effect of Partial Replacement of Fine Aggregate with Crumb Rubber in Concrete Made with Bida Gravel(4th International Engineering Conference (IEC 2022), 2023-10-22) Mohammed T. A.; Abbas B. A; YUSUF, Abdulazeez; Oritola S. F.The availability of sand at cheap rates for use as fine aggregate in concrete production is ever becoming unfeasible and this, in addition to environmental sustainability, places a huge need to search for an alternative source of fine aggregate materials. Crumb rubber made from waste automobile tires, can be used to complement sand as fine aggregate in concrete production. This study seeks to investigate the effect of partially replacing fine aggregate with crumb rubber in concrete made with Bida natural stones. Crumb rubber gotten from waste automobile tires was used to replace fine aggregate in the concrete at 0%, 5%, 10%, 15%, 20%, and 25%. The particle size distribution, workability, and compressive strength of these concrete specimens were extensively studied. Curing was done for the period of 7, 14, and 21 days. A mix ratio of 1: 1.65: 2.42 was used for cement content, fine aggregates, and Bida natural stones, respectively, at a water-to-cement ratio of 0.45. Results from the workability test performed showed that a higher percentage replacement of crumb rubber gives a corresponding decrease in the workability of the concrete. In addition, the results obtained from each concrete mix for all cases of curing ages revealed that flexural and compressive strengths decrease with an increasing percentage replacement of crumb rubber in the concrete mix. The flexural strength of the concrete mix was observed to be 6.08N/mm2 at 5% crumb rubber replacement. While at 25% crumb rubber replacement, a flexural strength of 3.08N/mm2 was observed. Similarly, the compressive strength of the concrete mix at 5% crumb rubber replacement was noticed to be 20.88N/mm2 and 11.89N/mm2 at 25% crumb rubber replacement. This implies that concrete made using crumb rubber as a partial replacement for fine aggregate can be used for structural applications such as in the construction of reinforced concrete slabs, beams, columns, and foundations where high strength is not required.Item Assessment of the Compressive Strength of Concrete Produced with Fine Aggregate from Different Locations in Minna(3rd International Engineering Conference (IEC 2019) Federal University of Technology, Minna, Nigeria, 2019) Aminulai, H. O.; Abdullahi, A.; Abubakar, Mahmud; Abdulrahman, H. S.; Alhaji, B.; Joseph, O. F; Aliyu, S. YThe construction industry in Nigeria has been witnessing serious collapse of buildings resulting from the qualities of materials used in their construction. This continuous collapse necessitates the need to investigate some of the materials used in the production of the building components in order to ascertain their appropriateness. This research thus investigates the compressive strength of concrete produced using fine aggregate from different locations in Minna. Fine aggregates were obtained from Chanchaga, Maikunkele, Bosso, Lapai Gwari and Garatu areas of Minna and subjected to series of tests namely: sieve analysis, Specific gravity, bulk density, moisture content, and water absorption. Concrete samples were produced using the mix ratio 1:2:4 and the water/cement ratio of 0.6. These samples were subjected to both the slump test and compressive strength test. For each of the fine aggregates, nine cubes of concrete (150mm x 150mm x 150mm) were cast, cured and tested at 7, 14 and 28 days. The results obtained for the mean compressive strength of the concrete produced shows that they all have mean strength greater than 20N/mm2 with fine aggregate from Chanchage having the highest mean of 25.17N/mm2 at 28days of curing. Thus all the fine aggregates could be used in the production of structural lightweight concrete but for structures that require higher strength, the fine aggregate from Chanchaga is recommended