Table 1 Chemical composition of OPC, FA and NS.

From: Machine learning predictions of high-strength RCA concrete utilizing chemically activated fly ash and nano-silica

Compositions

OPC

FA

NS

SiO2

21.78

63.23

94.9

Al2O3

3.01

22.98

4.22

Fe2O3

3.12

4.56

0.05

CaO

64.45

3

0.04

MgO

1.49

1.54

0.18

SO3

2.93

0.12

---

Na2O

0.28

0.11

0.01

K2O

0.79

1.48

0.03

LOI

2.15

2.98

0.57

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