Assessing the Suitability of Recycled Concrete Material in the Production of Concrete.

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Kabale University


The increasing scarcity of aggregates to satisfy the high demand on construction projects has led to the need to opt for new and sustainable alternative sources of aggregates. Besides a lot of concrete waste material continues to emerge out there being disposed off with less concern for the interests of the environment. This study investigated the suitability of using recycled concrete material as potential aggregates for fresh concrete production. Hardened concrete cubes of unknown compressive strength were randomly hammered to obtain the recycled aggregates that were used for experimentation. The study entailed evaluation of several properties on the recycled aggregates obtained and the natural aggregates as controls which included the particle size distribution, aggregate crushing, moisture content, water absorption and specific gravity. Several other tests were performed on fresh and hardened concrete produced from both recycled aggregates and natural aggregates such as the slump test and compressive strength test. The percentage of replacement of the natural aggregates with the recycled aggregates was at 100%. The results obtained showed that there was a potential increase in consistency of the concrete made from both recycled coarse and fine aggregates though with a slight decrease in the compressive strength. The results obtained from concrete made from natural aggregates were slightly higher than the characteristic strengths. The study concluded that despite the deviations in the properties, recycled concrete material was suitable for production of concrete since the deviations were still within the acceptable criteria emphasized by the ministry of works and transport.




Mumbere, Collins (2020). Assessing the Suitability of Recycled Concrete Material in the Production of Concrete. Kabale: Kabale University.