When I did my experiments, I found that phosphoric acid activated metakaolin could not be cured at room temperature, and it usually took three days for the initial set to occur.
First, let me be sure I fully understand your situation.
Your situation: phosphoric acid activated metakaolin fail to cure at room temperature
What you expected: phosphoric acid activated metakaolin fail to cure at room temperature
Phosphoric acid activated metakaolin (PAM) is a cementitious material often used as a low-energy alternative to Portland cement. Its curing process involves a chemical reaction between the phosphoric acid and the metakaolin, leading to the formation of a hydrated calcium phosphate-based material.
Several factors could contribute to the failure of PAM to cure at room temperature. Save time to go through the following:
To ensure proper curing of PAM at room temperature, it's important to:
- Use the correct amount of phosphoric acid.
- Select a metakaolin with appropriate reactivity.
- Maintain a suitable water-to-binder ratio.
- Ensure the materials are free from impurities.
- Provide adequate curing time and conditions, especially in colder environments.
- Mix the materials thoroughly to ensure even distribution.
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