Civil Engineering
Permanent URI for this collectionhttps://etd.hu.edu.et/handle/123456789/675
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Item PERFORMANCE EVALUATION OF CONCRETE MADE BY PARTIALLY REPLACING CEMENT WITH GRANITE POWDER(Hawassa University, 2020-10-21) ISSAYAS KEBEDE WORKUThis experimental investigation has been performed to evaluate the strength and durability properties of concrete, in which cement was partially replaced with granite powder at 0%, 5%, 10%, 15% and 20% by volume. A total of five concrete mix proportions were developed for control and concrete with granite powder. Fresh properties of concrete using slump test and strength and durability tests on hardened concrete were performed. Compressive strength test and flexure tensile strength test were done to evaluate the strength properties. To study the durability properties, water absorption test, Sorptivity test, chloride attack test and sulphate attack tests were performed on all concrete mixes, and these strength and durability tests were done for C20/25 as normal and C55/67 as high strength concrete. The experimental result showed a positive influence in strength and durability properties of concrete. The workability of concrete decreased as the percentage replacement increased in both C20/25 and C55/67 grade concrete. The compressive strength was enhanced up to 10% replacement in C20/25 and at 5% replacement in C55/67 concrete. The flexural tensile strength was improves up to 10% in both concrete grades. Denser concrete against water absorption was made at 5% & 10% in C20/25 and at 5% in C55/67. The initial rate of water absorption (Sorptivity) was good at 5% in C20/25 and at 10% in C55/67. The secondary rate of absorption was enhanced for all replacements in C20/25 concrete but for none of the replacements in C55/67.The resistance to chloride and sulphate attack was better at all percentage replacement in both concrete gradesItem EXPERMENTAL INVESTIGATION ON CONCRETE BY PARTIALLY REPLACING SAND WITH CRUSHED STONE DUST(Hawassa University, 2021-10-22) GUNSAMO GUSSA DIMATOConcrete is the most widely used construction material in urban areas of Ethiopia. Out of different constituent materials of concrete, fine aggregate is one of the key materials and river sand is the most common form of fine aggregate used in Ethiopia. However, with increased dwelling demand and construction activities in Ethiopia, the demand for river sand has increased which is leading to large scale depletion of river bed and increasing cost of sand to be afforded by common man. This has compelled the researchers to find alternative sustainable materials in place of river sand which can be easily used as fine aggregate in concrete. Various industrial wastes and agrowastes have been tried as an alternative to river sand and the results are promising. This research work aims at examining the viability of using crushed stone dust as a fine aggregate in concrete. So, in this research work an attempt has been made to experimentally investigate the mechanical and durability properties of concrete using crushed stone dust as fine aggregate. Different concrete mix samples were prepared by using query dusts as fine aggregate in different proportions from 30% to 70% by volume and the strength and durability properties were compared with that of controlled concrete at several curing period. The experimental result revealed that, adding crushed stone dust as a partial replacement of sand in concrete has positive influence on the strength and durability properties of concrete.