Investigation on Mechanical Properties of Concrete by replacing palm Ash and fine seashell powder as Partial Cement replacement

Manufacturing cement causes harm to the environment due to Co2 emissions. CO2 emission by the industry could be reduced by recycling natural waste materials such as palm ash and seashell powder; since seashell has 95% of calcium carbonate and palm ash can improve the mechanical properties. 15 cube, 3 beams were subjected to several tests to find the mechanical characteristics in a certain period. The tests were compression strength test, flexural test, workability, SEM tests, and sieving analysis. Thebeam dimensions measurements are 150mm*150mm*650mm, and 150mm*150mm*150mm for cubes. OPC was the main finding of compression strength which gained the highest strength, but in 28 days 25% of cement replacement gained 31.7Mpa when compared with other specimens. On the other hand, OPC and 5% of partial cement replacement were classified as high workability. In addition, flexural strength test showed that 15% of cement replacement achieved the highest strength compared with other specimens. SEM test showed the surface texture of PA and SP affect the hydration, therefore it will affect the strength of concrete.