Sample

Strength at 28 days (MPa)

Silt and clay content (%)

Organic impurities (photometric ohms)

Workability

Source of sand (as per suppliers)

Particle texture and shape

1

ML4

21.552

4.8

0.106

56 mm

Kajiado

Smooth & fine, Irregular

2

KB2

24.403

8.2

0.202

79 mm

Kajiado

Rough & fine, Irregular

3

KT1

24.537

13.5

0.168

93 mm

Machakos

Rough, Irregular

4

NR1

24.937

42.8

0.594

3 mm

Kangundo

Rough, Smooth

5

KW1

24.955

8.8

0.238

4 mm

Machakos

Rough & fine, Irregular