Performance of Recycled Aggregates as a Partial Replacement of Natural Aggregates in Concrete

Wong, Cheong Way (2018) Performance of Recycled Aggregates as a Partial Replacement of Natural Aggregates in Concrete. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

As we are more conscious towards having cleaner environment, we are continuously faced with challenges that the demolition waste continues increase and the usage of natural aggregates increase due to Malaysia is towards a developed country and now Malaysia is a developing the country and resulting a lot of construction activity and cause the environment pollution. Besides that, the next challenge is the reuse materials as well as converting waste materials such as recycled aggregates into more useful materials. Recycled Aggregate concrete is an environment friendly and greener alternative to use partial recycled aggregates to replace partial natural aggregates to reduce the demolition waste and reduce the usage of natural aggregates. In this research, the recycled aggregates will obtain from the demolition waste material which is crushed aggregates from concrete and the demolition waste will obtain from construction site. Recycled aggregates were utilized as the base materials for making the recycled aggregate concrete. The main focus of this study is test the compressive strength of the recycled aggregates concrete and the durability of recycled aggregates concrete in acidic environment and natural aggregates concrete as the control specimens. Same method and equipment currently used for conventional cement concrete were employed in this mixing, casting and preparation of recycled aggregate concrete specimens. The optimum mix proportion of recycled aggregate concrete was used in this preparation of recycled aggregates concrete specimens for compressive strength test and acid resistance test. In this research also, the resistance of recycled aggregate concrete to acid attack was studied by immersion of cube specimens (150mm x 150mm x 150mm) in 2% concentration of hydrochloric acid solution. One type of curing method was used in this study, which was water curing under x 28 days. The compressive strength test of recycled aggregate concrete and control specimens will carry out after 28 days of water curing. The visual appearance of the recycled aggregates concrete and control specimens will be record before and after immersed in 2% concentration of hydrochloric acid. The compressive strength will be carry out after immersed in 2% concentration of hydrochloric acid for 7 days, 14 days and 21 days. The compressive strength loss in the acid environment in 7 days, 14 days and 21 days will be record and the mass of the recycled aggregate concrete and control specimens will record for mass loss test. Results showed that, recycled aggregates materials perform relatively poor in acid resistance and compressive strength compared to natural aggregates.