Enhancement of High Strength Concrete Performance By Utilizing Nano Waste Paper Sludge Ash
High Strength Concrete (HSC) is an amazing breakthrough in the history of construction material. Due to its high strength, durability and economical value, it has been used in large scale construction with unique structure design which conventional concrete are unable to do. However, HSC uses a high amount of cement powder which contributes to its overall strength. The downside of this is it will contribute to high cement production that increases the carbon dioxide emission. Therefore, alternative to cement powder used in HSC mix is needed to make it more sustainable and improve its properties. This is where waste material like waste paper sludge ash (WPSA) is utilized in cement. WPSA has been proven by several studies to be beneficial in improving concrete properties. However, a nano engineered WPSA might enhance it capabilities in performing better than its raw form. Therefore, this research focusses on the physical and fresh properties of HSC with partial replacement of nano engineered WPSA to cement through experimental investigation. In this research, the HSC produce is with targeted strength of more than 40MPa with a fixed water cement ratio of 0.2. Whereas, the WPSA used is oven dry and is sieve to the size of 212 micrometer. Then, it is milled until nano size particle is obtained. The nano WPSA is used as replacement to cement in HSC mix with replacement percentage of 1%, 3%, 5%, 7% and 10%. The fresh properties of the concrete are measured by conducting flow table test and the physical properties is determined by conducting compressive test. Compressive test will be conducted for day 1, 3, 7, 14 and 28 with cube sample size of 50mmx50mmx50mm. This research shows that 1% of nano WPSA replacement tends to improve the compressive strength of the HSC concrete by 10.7% compare with control sample. On the other hand, the 1% replacement of nano WPSA in HSC does not affect the workability of the concrete when compare to control sample. This research hopes to improve conventional HSC properties with less usage of cement with the use of waste material.
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