About UHPC formula

[anna]

Questions regarding the preparation of UHPC with a strength index of 150-160MPa,

1. What is the approximate range of the amount of silica fume?

2. What cement to use and whether 525P.I cement necessary?

3. The mortar is relatively viscous, and there are still large bubbles after adding the defoamer, and hard to come out. Is there any suitable method or admixture to help?

 

[Cassie]

If the content of silica fume is high, there is no fluidity. Therefore, I add up to 5%. If putting more, one problem is the higher cost, and the second is the cause of an increase in viscosity, poor flow, and the need for adjusting the water-reducing agent. Furthermore, the higher the silica fume content, the greater the risk of cracking.

 

[Shamil]

1. The content of silica fume generally does not exceed 5%;

2. 52.5 Cement is required;

3. Select a high-efficiency polycarboxylate superplasticizer suitable for the material system.