Utilisation of Recycled Aggregate as Coarse Aggregate in Concrete
Abstract
In this rapid industrialised world, recycling construction material plays an important role to preserve the natural resources. In this research, recycled concrete aggregates (RCA) from site-tested concrete specimens were used. These consist of 28-days concrete cubes after compression test obtained from a local construction site. These concrete cubes are crushed to suitable size and reused as recycled coarse aggregate. The amount of recycled concrete aggregate used in this research is approximately 200 kg. Many researchers state that recycled aggregates are only suitable for non-structural concrete application. This research, however, shows that the recycled aggregates that are obtained from site-tested concrete specimen make good quality concrete. The compressive strength of recycled aggregate concrete (RAC) is found to be higher than the compressive strength of normal concrete. Recycled aggregate concrete is in close proximity to normal concrete in terms of split tensile strength, flexural strength and wet density. The slump of recycled aggregate concrete is low and that can be improved by using saturated surface dry (SSD) coarse aggregate.
References
Khalaf, F.M. et al. (2004). 'Recycling of demolished masonry rubble as coarse aggregate in Concrete: review.' ASCE J Mater Civil Eng (2004); 331- 340.
https://doi.org/10.1061/(ASCE)0899-1561(2004)16:4(331)
Crentsil Sagoe, K.K., Brown T. and Taylor A. H. (1999). 'Performance of concrete made with commercially produced coarse recycled concrete aggregate.' Journal of Cement and Concrete Research, 31 (2001); 707-712
https://doi.org/10.1016/S0008-8846(00)00476-2
Rao, A., Jha, K.N. and Misra S. (2005). 'Use of aggregates from recycled construction and demolition waste in concrete.' Journal of Resources, Conservation and Recycling, 50 (2007); 71-81
https://doi.org/10.1016/j.resconrec.2006.05.010
Oikonomou, N.D. (2004). 'Recycled Concrete Aggregates.' Journal of Cement & Concrete Composites 27 (2005); 315-318
https://doi.org/10.1016/j.cemconcomp.2004.02.020
Portland Cement Association. (2008). Concrete Technology Home-Concrete Design and Production-Materials: Recycled Aggregates. Retrieved August 26, 2008, from http://www.cement.org/tech/cct_aggregates_recycled.asp
Topcu, I.B. and Sengel, S. (2002). 'Properties of concrete produced with waste concrete aggregate.' Journal of Cement and Concrete Research, 34 (2004); 1307-1312
https://doi.org/10.1016/j.cemconres.2003.12.019
González, F.B. and Martinez, A.F. (2006). 'Concrete with aggregates from demolition waste and silica fume. Materials and mechanical properties.' Journal of Building and Environment, 43 (2008); 429-437
https://doi.org/10.1016/j.buildenv.2007.01.008
Malhotra, V.M. (1978). 'Use of recycled concrete as new aggregate.' Proceedings of the Symposium on Energy and Resource Conservation in the Concrete Industry CANMET Rep. No. 76-8, CANMET, Ottawa, Canada (1978); 4-16.
Rasheeduzzafar and Khan, A. (1984). 'Recycled concrete - a source of new concrete.' ASTM Cem., Concr., Aggregates, 6 (1) (1984); 17-27.
https://doi.org/10.1520/CCA10349J
Tavakoli M. and Soroushian P. (1996). 'Strengths of recycled aggregate concrete made using field-demolished concrete as aggregate.' Journal of ACI Materials. 93 (2) (1996 (March-April)); 182-190
Poon, C.S. and Chan D. (2006). 'The use of recycled aggregate in concrete in Hong Kong.' Journal of Resource, Conservation and Recycling, 50 (2007); 293-305
https://doi.org/10.1016/j.resconrec.2006.06.005
BS1881 Part 116. Method for Determination of Compressive Strength of Concrete Cubes. British Standard Institution.
ASTM C496. Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens. Annual Book of ASTM Standard.
ASTM C78. Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading). Annual Book of ASTM Standard.
Frondistou, Y.S. (1977). 'Waste Concrete as aggregate for New Concrete.' ACI Journal, (August 1977); 373-376.
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