Document Type : Research Paper


1 Civil Engineering Department, University of Technology, Baghdad, Iraq.

2 Civil Engineering Department, University of Technology, Baghdad , Iraq.


Although many researchers have done many studies on recycled aggregate concrete, information is very little about the influence of utilizing recycled aggregate in the production of reactive powder concrete. Experimental work was executed to investigate the influence of utilizing recycled concrete as fine aggregate in reactive powder concrete. Five different mixes were prepared, the first mix, or control mix, was prepared with natural sand, four additional mixes were prepared with different percentage of substitution of fine aggregates(20%,40%,60%, and 80%). The investigation was carried out using compressive strength test, direct tensile strength test and flexural strength test, and two methods of curing were used standard curing at 20 °C and steam curing at 90°C. the results indicated that the strength decreases with increased the percentage of recycled fine aggregate, and the best percentage was 40% replacement where the percentages of decrease at this percentage at 28-day steam curing were 2.46, 6.66, and 2.14 for compressive strength, flexural strength, and direct tensile strength respectively.


[1] N. H. Yi, J. H. Kim, T. S. Han, Y. G. Cho, and J. H. Lee, “Blast-resistant characteristics of ultra-high strength concrete and reactive powder concrete,” Construction and Building Materials, Vol. 28, No. 1, pp. 694-707, 2012. 
[2] M. Canbaz, “The effect of high temperature on reactive powder concrete,” Construction and Building Materials, Vol. 70, pp. 508-513, 2014.
[3]J. Brito, and R. Robles, “Recycled aggregate concrete (RAC) methodology for estimating its long-term properties,” I J E M S Journal of Engineering and Materials, Vol. 17, No. 6, pp. 449-462, 2010.
[5] ASTM C 109/C 109M, “Standard test method for compressive strength of hydraulic cement mortars (using 2-in. or [50-mm] cube specimens),” Vol. 04, 01, 6p. 2005.
[6] L. A. Ahmed, S. S. Hassan and O. A.  AL-Ameer, “Ultra-high performance reinforced by polypropylene fiber concrete made with recycled coarse aggregate,” Kufa Journal of Engineering, Vol. 8, No. 3, pp. 128-141, 2017. 
[7] C. C. Fan, R. Huang, H. Hwang and S. J. Chao, “The effects of different fine recycled concrete aggregates on the properties of mortar,” Materials, Vol. 8, No.5, pp. 2658-2672, 2015. 
[8] S. Collepardi, L. Coppola, R. Troli and M. Collpardi, “Mechanical properties of modified reactive powder concrete,” ACI SPECIAL PUBLICATIONS, Vol. 173, pp. 1-22, 1997.
[9] ASTM C 348-18 “Standard test method for flexural strength of hydraulic- cement mortars,” Annual Book of ASTM Standards, 1985.
[10] British Standard Part 116 “Method for determination of tensile strength of mortar,” British Standard Institution, pp. 6319-7, 1985.