	Sample	28 day strength (N/mm²)	Silt and clay content (%) (x1)	Organic impurities (ohms) (x2)	Sand texture	Particles shape	Grading	Slump
	(a) Group of sand samples with rough surface texture, moderate grading & high workability
1	KB2	24.403	0.082	0.202	Rough	Irregular	65%	79 mm
2	KT1	24.537	0.135	0.168	Rough	Irregular	53%	93 mm
3	KBU1	20.730	0.128	0.361	Rough	Irregular	46%	86 mm
4	CL2	24.680	0.003	0.023	Rough	Irregular	57%	58 mm
5	DC4	19.620	0.158	0.147	Rough	Irregular	69%	65 mm
	(b) Group of sand samples with rough surface texture, moderate grading & low workability
6	KW1	24.955	0.088	0.238	Rough	Irregular	86%	4 mm
7	DC4	28.929	0.158	0.147	Rough	Irregular	69%	10 mm
8	CL2	31.858	0.003	0.023	Rough	Irregular	57%	13.5 mm
9	KBU1	37.455	0.128	0.361	Rough	Irregular	46%	9 mm
	(c) Group of sand samples with smooth surface texture, varied grading & varied workability
10	DC2	26.979	0.161	0.738	Smooth	Rounded	72%	11 mm
11	KB3	30.393	0.17	0.513	Smooth	Rounded	58%	5 mm
12	DC1	27.188	0.189	0.415	Smooth	Rounded	70%	52 mm
13	NR1	24.937	0.428	0.594	Rough	Rounded	42%	3 mm