Alkali Activated Materials are NOT Geopolymers - Part 1
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- Опубліковано 12 жов 2024
- Watch Part 2 here: • Alkali Activated Mater...
Watch Part 3 here: • Alkali Activated Mater...
Watch Part 4 here: • Alkali Activated Mater...
To sum-up: Alkali-Activated Materials (AAM) are NOT Polymers, so they cannot be called Geo-Polymers. Geopolymers are NOT a subset of AAM because they are not a calcium hydrate alternative, the chemistry is radically different. Those who claim that both terms are synonyms are promoting a misleading scientific belief. Learn why by watching these two videos.
Many scientists and civil engineers are mistaking alkali activation for geopolymers, fueling confusion, using them as synonyms without understanding what they really are.
In his four recent keynotes at the Geopolymer Camp 2014, 2015, 2016 and 2017, Prof. J. Davidovits explained why Alkali-Activated-Materials are not Geopolymers, or why alkali-activation is not geopolymerization. We have selected and merged into one video all the sequences that had been dedicated to this issue in the GPCamp-2014 keynote. The new video is titled: Why Alkali-Activated Materials are NOT Geopolymers. You will finally understand why they are two different systems.
In this first part, Prof. J. Davidovits explains the main differences between AAC -Alkali-Activated Cement or Concrete-, AAS -Alkali-Activated Slag-, AAF -Alkali-Activated Fly Ash- and Slag-based Geopolymer cement, in terms of chemistry, molecular structure, long-term durability. In a second part, on hand of the industrialization of Slag/fly ash-based geopolymer cement/concrete implemented by the company Wagners, Australia, he focusses on the results provided by the carbonation testing data obtained for OPC, AAS and EFC -Slag/fly ash-based geopolymer-. The tests were carried out at the Royal Melbourne Institute of Technology RMIT in Australia. Geopolymer behaves like regular Portland cement, whereas AAS gets very bad carbonation results.
When using a slag/ fly ash geopolymer based cement (assuming the fly ash is class f at a high % of total binder), using a chemical such as sodium silicate (modulus between 1 and 2), would this be considered a geopolymer or alkali activation? How does one know the difference? Is it based on the powder used? or the chemical used to increase the pH?
Hi! Mr Jason, did you found the answer for your question? I have the same doubt because most of the researchers are using those two words as synonyms.
the sodium silicate is not the alkaline activator. That would be either NaOH or CaOH.
I don't know much but I personally considered some alkali-activated materials to geopolymerize under certain conditions such as low Ca and high Al content. It's the same kind of chemical activation process but different pathways. Just some researchers don't like their self-proclaimed terminology to be changed by other researchers.
@@Comikz1 I have shared my opinion by replying to Mr. Jason. May I know whether you have found your answers over these years, please?
Amezing presentation
i dislikes this video because i have to translate this from English to Spanish for my cousin in south america and i barely can speak English, non the less Spanish
This was 3 years ago, but for those experiencing the same problem. This video has captions.