Abstract:
Properties of the recycled fine aggregates and the suitability of the
same in cementitious mortar were studied and compared with those of natural
fine aggregates. The results showed that the particle size distribution of
recycled fine aggregates is compatible with those of natural fine aggregates. The
recycled fine aggregates had fine fraction and bulk density of 13.47% and
1407kg/m3, respectively while those of the natural fine aggregates were 1.51%
and 1453kg/m3, respectively. Specific Gravity of recycled fine aggregates was
2.499with compared to 2.408 of Natural fine aggregates and the water
absorption was 6.325% with compared to 0.71% of Natural fine aggregates.
Chloride Content of recycled fine aggregate was 0.0150% with compared to
0.0005% of natural fine aggregate. Properties of mortar made fewer than five
testing scenarios consisting different proportions of natural fine aggregate to
recycle fine aggregate as 100%-0%,75%-25%,50% -50%, 25%-75%, and 0%-100%
were compared with those of 100% natural fine aggregates. With increasing
percentage of recycled aggregate content, compressive strength increased in 0.7
Water cement ratio while the workability decreased. According to the results,
mortar properties could be achieved with mix proportions of 50% natural fine
aggregate and 50% recycled fine aggregate, without significantly affecting the
mortar properties, indicating a 50% saving of natural fine aggregates thus
reducing environmental impacts and enhancing sustainability.
Citation:
Subasinghe, I.S., Madusanka, V.P.S., Jayasinghe, V.R.D.K., Sundarapperuma, S.M.A.P., Fernando, W.S.S.R., Chandrasiri, S.A.K.N., & Karunarathne, S. (2014). Effects of recycled fine aggregate content on cementitious mortar. In P.V.A. Hemalal (Ed.), Proceedings of the 8th National Conference on Earth Resources Management (pp. 61-65). Department of Earth Resources Engineering, University of Moratuwa.