The open time of tile adhesive cannot pass 20 minutes, please analyze the formula below

Alex

Alex

Moderator
Cement 280，coal ash 70， graded sand 635， cellulose ether 2.5
Starch ether 0.5， early strength agent 4， redispersible polymer powder 8
Water addition 24.5%， temperature 27℃， humidity 55%

The formula is as above: the original strength is 1.5, the freeze-thaw strength is 1.0, but the open time is not good. After 20 minutes, there is no adhesion on the ceramic tile surface, and the drying strength is only 0.1. Will the moisture content of the concrete slab affect the drying strength?
 
Try changing the sand. I also encountered this situation and found that it was the problem with the sand.
 
In this case, you should first check whether the wind speed of your air conditioner is too high. The strength of other conditions can prove that the raw materials are OK. Windblowing has the most significant impact on the open time.
 
If you find the suitable cellulose ether, it should be no problem with using 2.5kg to have the qualified strength after 20 min. If you don’t want to change the cellulose ether, then increase the usage amount. I think 3kg should be enough.

During the test, temperature, humidity, and wind significantly influence. It should be around the standard 23 degrees and humidity 50%. Your temperature is a bit high.
 
Cassie said:
If you find the suitable cellulose ether, it should be no problem with using 2.5kg to have the qualified strength after 20 min. If you don’t want to change the cellulose ether, then increase the usage amount. I think 3kg should be enough.

During the test, temperature, humidity, and wind significantly influence. It should be around the standard 23 degrees and humidity 50%. Your temperature is a bit high.
Click to expand...
The open time of 2.5kg of cellulose ether is difficult. As it mentioned above, you must try cellulose ether from different manufacturers.
 
Cassie said:
If you find the suitable cellulose ether, it should be no problem with using 2.5kg to have the qualified strength after 20 min. If you don’t want to change the cellulose ether, then increase the usage amount. I think 3kg should be enough.

During the test, temperature, humidity, and wind significantly influence. It should be around the standard 23 degrees and humidity 50%. Your temperature is a bit high.
Click to expand...
It is indeed considered that temperature will have an impact, but there is no data to prove how significant the effect is, so I want to find out what the reasons are first. I have tried 3.0kg, 3.5kg, and 4.0kg. Although they will increase the drying strength during, they but cannot reach 0.5MPa.
 
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