water permeation properties of self compacting concrete made with coarse and fine recycled concrete aggregates

The paper presents results of an experimental investigation carried out on the water permeation properties of self compacting concrete (scc) containing fine recycled concrete aggregates (frca) and coarse recycled concrete aggregates (crca) as replacement of fine natural aggregates (fna) and coarse natural aggregates (cna), respectively. the replacement levels of cna with crca were kept as 0, 50 and 100 %. for 50 and 100 % replacement of cna with crca, 0, 25 and 50 % frca were used in place of fna. in all the scc mixes fly ash was used as partial replacement of portland cement. properties of fresh scc were assessed using slump flow test, v-funnel test and l-box test. the water permeation properties of hardened scc were investigated using initial surface absorption test, water permeability test and capillary suction test. the compressive strength of all the mixes was also determined. the results indicate that increasing the replacement level of cna with crca has been observed to deteriorate the properties of scc, whereas the replacement of fna with frca up to 25 % has been found to improve the water permeation properties and compressive strength of scc mixes up to some extent. results of this investigation lend support to the use of recycled aggregates in scc.