Improving the Quality of Mixed Recycled Coarse Aggregates from Construction and Demolition Waste Using Heavy Media Separation with Fe₃O₄ Suspension

Table 3

Summary of mix proportions for compressive strength tests.

Number	Aggregate type	W/C	S/a (%)	Unit weight (kg/m^3)
				W	C	S	G
1	RCA before HMS	45.2	38	167	358	675	1027
2	RCA 2.45	45.9	37.8	162	353	670	1067
3	RCA 2.55	45.2	38	162	359	671	1067
4	RCA 2.65	46.6	38.7	167	358	678	1026
5	NCA	45.0	38	162	358	670	1025

Note: RCA-2.45, RCA after heavy media separation process with a magnetite medium density of 2.45 kg/cm³; NCA, natural river coarse aggregates; W/C, water-to-cement ratio; S/a, sand-to-coarse aggregate ratio by weight; W, water; C, cement; S, sand; G, gravel.