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 |