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dc.contributor.authorNalweyiso, Eunia Ruth
dc.date.accessioned2023-09-25T10:03:13Z
dc.date.available2023-09-25T10:03:13Z
dc.date.issued2022-09-25
dc.identifier.citationNalweyiso, Eunia Ruth. (2023). An investigation into the reliability of using concrete cubes to determine the strength of concrete structures. (Unpublished undergraduate dissertation) Makerere University; Kampala, Uganda.en_US
dc.identifier.urihttp://hdl.handle.net/20.500.12281/16449
dc.descriptionA final year project report submitted to the department of Geomatics and Land Management in partial fulfillment of the requirements for the award of a degree Bachelor of Science in Quantity Surveying of Makerere University.en_US
dc.description.abstractMany concrete practices, such as measuring compressive strength of concrete using concrete cubes, have existed since the early 1900s. However, structural members such as columns, beams and slabs differ from concrete cubes in several ways. Due to this, researchers have taken to investigating the effect of the differences on the compressive strength test results and it was discovered that the differences between cubes and structural members can cause variances between compressive strength. In order to minimise the rate of deterioration and collapse of structures, this research aims at assessing the reliability of concrete cubes in determining the strength of concrete structures. An observation survey was done to identify the mix ratios, water quality, mixing method and curing method applied for the concrete members at the various construction sites. A non-destructive rebound hammer test was conducted on concrete cubes cast on site, as well as the structural members including columns, beams, retaining walls, staircases, and lift wells. The crushing strength test was also performed on the concrete cubes to determine the variance between compressive strength of cubes and structural members on twenty-six construction sites in Uganda. The results revealed an inverse relationship between concrete strength the reliability of the cubes. This was demonstrated by the fact that the strongest concrete mix in the study, 1:1.5:3, had the largest variance between cube and structure strength (23%). It was further confirmed by the observation that regardless of the mix, cubes' reliability is lower at 28 days than at 7 days. The research further found that after concrete strength, the quality of the water used for mixing and curing had the greatest impact on the difference between cube and structure strength, resulting in a margin of difference of 22% 28 days after casting when pond water was used.en_US
dc.language.isoenen_US
dc.publisherMakerere Universityen_US
dc.subjectConcrete cubesen_US
dc.subjectConcrete structuresen_US
dc.titleAn investigation into the reliability of using concrete cubes to determine the strength of concrete structures.en_US
dc.typeThesisen_US


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