The Recycled Aggregates with Surface Treatment by Pozzolanics


Article Preview

To improve the mechanical properties of concretes containing recycled aggregates, pozzolanic materials were used to decrease the porosity of the recycled aggregates. These pozzolanic materials were adhered on the surface of recycled aggregates and closed the open pores so that the water absorption was decreased 1~2% as the amount of adsorption was increased. Compressive strength of cement mortars and concretes using surface treated recycled aggregates reaches above 95% of the strength of its natural counterparts. Investigation of the microstructures using the scanning electron micrographs showed the formation of dense interface after the adsorption treatment of pozzolanics to recycled aggregates.



Edited by:

Hai-Doo Kim, Hua-Tay Lin and Michael J. Hoffmann




J. J. Kim et al., "The Recycled Aggregates with Surface Treatment by Pozzolanics", Key Engineering Materials, Vol. 287, pp. 63-68, 2005

Online since:

June 2005




[1] L.E. Choi, A case study recycling of Recycled Aggregate used waste concrete, Chungang university Construction & Industry technology Research Institute, Korea (1995).

[2] J.Y. Lee, A forum about the environmental preservation and a plan of waste recycling, Construction & Economy Research Institute of Korea (1997).

[3] H.D. Kim, N.Y. Leem, Concrete used cement mortar and recycled aggregate, Korean patent 100199998 (1999).

[4] S.I. Nam, Study of engineering characteristics of recycled aggregate concrete, Chungnam national university (1984).

[5] Nixon, P. J, Recycled concrete as an aggregate for concrete, Materials and Structure, Vol. 2, No. 65, pp.371-378 (1978).

[6] Wäinwright, P. J., Yu Y. and Wang Y., Modifying the performance of concrete made with coarse and fine recycled concrete aggregate, " 3rd Int, l RILEM Symp., Ed by Lauritzen, E & FN Spon (1994).

[7] Ravindrajah, S. T. and Tam C. T., Recycling concrete as fine aggregate in concrete, J. of Cement Composites and Lightweight Concrete, Vol. 9, No. 4, pp.235-241 (1988).


[8] J.H. Kim, Recycling problem and measures of construction waste, Dong-ah Construction Industrial Co. Ltd. (1995).

[9] Hansen, T. C. and Hedegard S. E., Properties of recycled aggregate concrete affected by admixtures in original concretes, ACI Journal, Vol. 81, No. 3, pp.21-26 (1984).


[10] Hunter, R. J., Introduction to modern Colloid Science, pp.32-56, 274-279 IN Oxford Univ. Press (1993).