“Geopolymer Chemistry and Composition: A Comprehensive Review of Synthesis, Reaction Mechanisms, and Material Properties—Oriented with Sustainable Construction” #geopolymers #cements #materials #paper #toread
on 02026-01-15#Geopolymers #paper #PDF #toread citing NMR spectroscopy results
on 02026-01-13#Geopolymers #video featuring Davidovits himself, from “2024 Geopolymer Camp”. He presents a lot of scanning electron #microscopy to support his claims about the chemical structures of geopolymers, but the flexural strength is still very low (apparently a new metakaolin boosts it from 10 MPa to 30 MPa) and I would have liked to see something like NMR spectroscopy or Raman spectroscopy or FT-IR spectroscopy to support his claims that the geopolymer structure is covalent rather than ionic (which he never really comes out and says explicitly). He goes on to try to sell his new book about ancient Bolivian and Easter Island geopolymers.
on 02026-01-13more #video about #cements #materials which falls pretty far short of including enough information for reproducibility, talking about “bast” fiber without specifying what plant, confusing caliche with clay, misstatements (“portland has clay in it”, “those [lime and portland bound concretes] need oxygen to cure”), etc. He’s also very confused about #geopolymers. I’m amazed how many factual errors he was able to fit into a single 21-minute video. Where it’s not wrong, it’s super unclear. Also I thought this was going to be about MgO cements, because that’s what it says in the title, but he doesn’t say anything specific about MgO, except that I think he’s confusing it with Al₂O₃. #Plonk to "mrglasecki".
on 02025-11-11bullshit #video by "Belinda Carr" about #geopolymers claiming that geopolymer cement is waterproof because “its pores are smaller than 50 nanometers so big molecules like water can’t enter the geopolymer matrix.” PLONK PLONK PLONK
on 02024-09-10