American Journal of Engineering Research (AJER) 2016 American Journal of Engineering Research (AJER) e-ISSN: 2320-0847 p-ISSN : 2320-0936 Volume-5, Issue-4, pp-182-191 www.ajer.org Research Paper Open Access www.ajer.org Page 182 Recycling Of Concrete Waste Material from Construction Demolition Aiyewalehinmi E.O 1 and Adeoye T.E 2 Department of Civil Engineering, the Federal University of Technology, Akure. Abstract: This study investigates the engineering properties of demolished concrete aggregates wastes along Arakale Road, Akure. The purpose is to recycle and reduce the amount of construction wastes materials going into landfills and dumping pits. The study identifies about 15% to 20% of construction waste materials go into landfill and dumping pits in Akure. Four different mixes at 0.5, 0.55, 0.60 and 0.65 water/cement ratios were performed and a total of 96 (48 each) concrete cube samples were cast, cured and crushed. The results showed that at lower percentage water/cement ratios, the compressive strength of used aggregates at day 28 were much lower than virgin aggregates (16.89N/mm 2 , 19.93N/mm 2 ) while at higher percentage water/cement ratios, the compressive strength of used aggregates at day 28 was almost the same as Virgin aggregates (18.07, 18.37). It shows that the used aggregates can attain the same compressive strength as virgin aggregates at higher water/cement ratios. Keywords: Demolished Aggregate, Natural Aggregate, Construction waste, Compressive Strength, Coarse Aggregates I. INTRODUCTION Construction and Demolition(C&D) debris includes bricks, concrete, masonry, soil, rocks, lumber, paving materials, shingles, glass, plastics rocks, lumber, aluminum (including siding), steel, drywall, insulation, asphalt roofing materials, electrical materials, plumbing fixtures, vinyl siding, corrugated cardboard, and tree stumps (Construction Waste Recycling, (2012)). The construction waste materials produced in Akure metropolitan are in large quantities, and they are found everywhere along Akure roads. Reuse of Construction waste materials attracts new Technology, Social values, costs and employment. It also helps to reduce the dependency on virgin materials and importation of foreign materials. Reuse of discarded construction waste materials in Nigeria is not new, it is only they have not been properly documented for future use. The concept of reuse of discarded material is associated with Recycling Technology. This type of technology is driven on the basis of needs. At the construction site demolished aggregate materials can be processed or recycled to replace virgin materials for immediate needs. In term of transformation, the process may in involve new technology, new product and new skill. Recycling of construction waste materials in Nigeria would save the country a considerable amount of money, worth billions of Naira annually. In Nigeria and most of other developing countries where technological development is still growing, some regions especially large urban areas already facing problems of obtaining adequate aggregate supplies at reasonable cost due to distance. For example in some local government areas in Ondo State, there is a critical shortage of natural aggregate for concrete production. The issue of recycling of construction waste materials cannot be ignored. Moreover, the increase in demand to cut costs demonstrates environmental construction sensitivity. Furthermore, a continued environmental awareness instigates the pressure for re-use construction materials instead of classifying them as waste materials. Using construction waste material as an aggregate for developing new concrete product is technically viable and may, in some circumstances, be environmentally beneficial. Recycling is an important process which is used to produce a useful source of aggregate for the construction industry. Concrete recycling is increasingly becoming popular way of utilizing aggregate left behind demolished structures, road construction materials and site waste materials. In the past, demolished structural materials were disposed into landfills and dumping pit little or no attention being paid to environmental consideration, concrete recycling allows reuse of the rubble while also keeping construction costs down. Considering the cost of storage, transporting and loss of revenue it makes financial sense for construction companies to take action, to minimize construction waste materials (Akinkurolere & Franklin, (2005)). Buck (1977) and Frondistion-Yannas (1977) have shown that it is possible to produce new concrete from crushed concrete, but that recycled concrete may be expected to have lower strength than concrete made with similar aggregate not previously used. Okafor (2010) indicated that recycled