Table 2 Mixing methods and procedures of paste.
From: The Mechanical Properties of Alkali-Activated Slag-Silica Fume Cement Pastes by Mixing Method
| Â | 10S | 5S5F | 10S-T | 5S5F-T | 5S5F-TA | 5S5F-TB |
|---|---|---|---|---|---|---|
Ready | Place all the mixing liquid (total water + total activator) in the bowl | Place all the mixing liquid (water/2 + activator/2) in the bowl | Place all the mixing liquid (water/2 + total activator) in the bowl | |||
1st-cycle | Add the 100% slag in the bowl and allow 30 s for the absorption of the liquid | Add the binder (slag + SF) in the bowl and allow 30 s for the absorption of the liquid | Add the 100% slag in the bowl and allow 30 s for the absorption of the liquid | Add the binder (slag + SF) in the bowl and allow 30 s for the absorption of the liquid | Add the slag in the bowl and allow 30 s for the absorption of the liquid | |
Start the mixer and mix at the slow speed (140 ± 5 r/min) for 30 s | ||||||
Stop the mixer for 30Â s and during this time scrape down into the batch any paste that may have collected on sides of the bowl | ||||||
Start the mixer and mix at the medium speed (285 ± 10 r/min) for 30 s | ||||||
Stop the mixer and let the paste stand for 90Â s. During the first 15Â s of this interval, quickly scrape down into the batch any paste that may have collected on the side of the bowl; then for the remainder of this interval, close the mixer enclosure or cover the bowl with the lid | ||||||
Finish by mixing for 60 s at medium speed (285 ± 10 r/min) | ||||||
2nd-cycle |  |  | Stop for 30 s | Add the SF and liquid (water/2 + activator/2) in the bowl for 30 s | Add the SF and water/2 in the bowl for 30 s | |
|  |  | Start the mixer and mix at the slow speed (140 ± 5 r/min) for 30 s | ||||
| Â | Â | Stop the mixer for 30Â s and during this time scrape down into the batch any paste that may have collected on sides of the bowl | ||||
|  |  | Start the mixer and mix at the medium speed (285 ± 10 r/min) for 30 s | ||||
| Â | Â | Stop the mixer and let the paste stand for 90Â s. During the first 15Â s of this interval, quickly scrape down into the batch any paste that may have collected on the side of the bowl; then for the remainder of this interval, close the mixer enclosure or cover the bowl with the lid | ||||
|  |  | Finish by mixing for 60 s at medium speed (285 ± 10 r/min) | ||||