In this episode, Dr. Jon Belkowitz and Seth discuss colloidal silica and its various applications in the concrete industry. Dr. Jon highlights the differences between colloidal silica and silicates, emphasizing the benefits of using colloidal silica as a densifier and for surface treatments. He also mentions the ongoing efforts to create an ASTM standard for colloidal silica.

The conversation touches on the importance of performance testing and the potential long-term impact of using colloidal silica in concrete.

Takeaways
• Colloidal silica is a controlled suspension of nano-sized particles of silica, typically between 1 and 100 nanometers in diameter.
• Colloidal silica is used as a densifier and for surface treatments in the concrete industry.
• Silicates, on the other hand, react quickly and create a gel-like surface, which can limit penetration into the concrete.
• Using colloidal silica instead of silicates can provide longer-term benefits and reduce the risk of issues like hydrolysis in flooring systems.
• The ASTM is working on creating a standard specification for colloidal silica use in concrete, including performance testing.
• Colloidal silica offers ease of finishing and can help prevent issues like pinholes in the concrete surface.


Chapters
00:00 Introduction and Overview
03:06 Definition and History of Colloidal Silica
07:16 Differences Between Colloidal Silica and Silicates
13:15 The Importance of Using the Right Materials in Concrete
26:07 Progress Update on ASTM Standard for Colloidal Silica

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Episode References
Guest: Dr. Jon Belkowitz | Intelligent Concrete | [email protected]
Guest Website:⁠ https://www.intelligent-concrete.com/

Producers: Jodi Tandett
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