Steel Reinforcement

The aim of this project is assess bamboo as an alternative to steel reinforcement in concrete structures which offers similar performance as steel reinforced concrete which can be used in areas where bamboo is abundant. Three samples each of dimension 500×100×100mm of plain, bamboo and steel reinforced concrete beam of seven, fourteen and twenty-one days after curing were subjected to a flexural test to measure their flexural strength. This test was conducted with a four point load flexural machine, with load applied on the beams to determine the ability of the beam to withstand bending forces. The beam samples were weighed before and after curing to obtain their weight gain and water absorption rate. The average flexural strength obtained from the plain, bamboo and steel reinforced beams of a period of seven days, fourteen days and twenty-one days was recorded. The result showed that for a period of seven days, the plain, bamboo and reinforced steel beam had a flexural strength of 9 N/mm², 16.67 N/mm² and 25 N/mm². Fourteen days 15N/mm², 23.33N/mm² and32.33N/mm². Twenty-one days 19N/mm², 29.67N/mm² and38.33N/mm². For water absorption the percentage is consistently higher compared to the plain and steel beam at each time interval. At seven days the water absorption was at 1.55%, and it increases further at fourteen days at 1.79% and twenty-one days 1.62%. based on the acquired results bamboo reinforced concrete can be suitable for structures such as farm sheds, rural housing and low-rise residential building for element such as walls.

This study examines how curing reinforced concrete in a urea-salt solution, which simulates urine, affects its compressive strength and durability. This is compared to concrete cured in fresh water. The research addresses concerns about the decline of concrete structures in environments that are biologically or chemically harsh, such as areas often contaminated by urine. Understanding the impact of such exposure on concrete performance is important for improving the design and maintenance of durable structures under these conditions. The experimental work involved casting twenty concrete cubes, each measuring 100 × 100 × 100 mm, using a mix ratio of 1:2:4 and a water-cement ratio of 0.5. Ten cubes were cured in fresh water, while the other ten were cured in a urea-salt solution made with 10 g of urea and 2 g of sodium chloride (NaCl) per liter of water. The cubes were tested for compressive strength after 14 and 28 days of curing using a compression testing machine. The data gathered were analyzed and compared to evaluate the impact of the urea-salt solution on concrete performance. The average compressive strengths were 18.81 N/mm² and 23.17 N/mm² for the 14- and 28- day fresh-water samples, and 18.15 N/mm² and 17.81 N/mm² for the urea-salt-cured samples which indicates that concrete cured in fresh water showed normal strength growth with age. In contrast, the concrete cured in the urea-salt solution had a slight decrease in compressive strength over time. It was concluded that exposure to the urea-salt solution restricts full hydration and weakens concrete durability with extended contact. It is advised that structures in areas prone to urine contamination be shielded from direct exposure.