Research Article
Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete
Figure 7
SEM images of hardened cement paste specimens with and without the accelerator.
| (a) Without the accelerator, 240 min |
| (b) With the accelerator, 8 min |
| (c) Without the accelerator, 1 d |
| (d) With the accelerator, 1 d |
| (e) Without the accelerator, 28 d |
| (f) With the accelerator, 28 d |