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Table 7 Stirring times of distilled water and RFAs and changes in pH.

From: Evaluation on the Surface Modification of Recycled Fine Aggregates in Aqueous H2SiF6 Solution

Number of tests

pH by stirring time

0 min

1 min

3 min

5 min

1

10.67

11.26

11.43

11.51

2

10.36

11.29

11.44

11.57

3

10.60

11.30

11.32

11.53

4

10.44

11.28

11.45

11.51