Reclamation of Fresh Concrete Waste in Sri Lanka. - Harith, Keshan Kannangara (Nilai: INTI International University, 2019)
B.Eng (Hons) in Civil Engineering August 2019
BCEGI 71
FEQS-Civil August 2019
Concrete is widely used in the construction industry and the annual concrete production is 4.4 billion tons and it is expected to rise to over 5.5 billion tons by the end of 2050. In fact, the waste generated accounts for 50 percent of total construction and demolition. Today the industry deals with enormous amounts of construction waste. Considering concrete batching plants in Sri Lanka, it is found that approximately 5000 liters of fresh concrete waste are generated per day within the plant premises. This is mainly due to over-ordered and leftover concrete. The current practice in Sri Lanka is to discharge into a septic tank, which is the most unsustainable method of disposal and a complete loss of resources. This research project focuses on separating the concrete constituents of fresh concrete waste (FCW), by making a prototype (rotary drum) to separate coarse and fine aggregate and to obtain recycle water from the concrete slurry through a wastewater treatment process. The prototype (rotary drum) will be made using steel sheets, with a pore size of 8 mm and 20 mm to separate fine and coarse aggregate respectively. To remove suspended solids from the wastewater, coagulant (alum) is added to settle the sludge. Fine solids are further removed by filtration. The water samples were tested as per the ASTM and EN standards. A working prototype was built and the average percentage loss of coarse and fine aggregate was found as 6.7% and 11.3%. From the water testing, it is found that using Alum (coagulant) only showed better results as compared to using chemicals Hydrochloric acid and Sulfuric acid to treat the concrete slurry
Being a project report submitted to INTI International University as a requirements for Bachelor Of Engineering (Hons) in Civil Engineering August 2019 under the managment and supervision of Faculty of Engineering & Quantity Surveying, INTI International University
Keywords: BCEGI; Dissertations, academic -- -- Engineering; Civil Engineering