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Table 1 Chemical composition of RHA and WTS

From: Incorporation of untreated rice husk ash and water treatment sludge in masonry unit production

Elements

Mass % in OPC

Mass % in URHA

Mass % in WTS

SiO2

20.4

74.4

34.6

Al2O3

6.1

24.3

K2O

0.5

5.1

3.0

CaO

65.9

3.9

3.7

Fe2O3

3.9

3.9

22.5

SO3

1.3

0.7

2.8

TiO2

0.7

0.4

MgO

0.6

0.8

1.9

LOIa

1.3

10.5

6.8

  1. aLOI Loss on ignition