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Composition of Phases in Geopolymer Leslie J. Struble, University of Illinois, DMR 1008102

Composition of Phases in Geopolymer Leslie J. Struble, University of Illinois, DMR 1008102.

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Composition of Phases in Geopolymer Leslie J. Struble, University of Illinois, DMR 1008102

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  1. Composition of Phases in GeopolymerLeslie J. Struble, University of Illinois, DMR 1008102 Outcome This research shows that geopolymers, made by reacting an aluminosilicate powder with an alkaline solution, can be made from a waste material for use as a binder in structural concrete in place of Portland cement. Impact Portland cement produces large amounts of CO2 and is thus not very sustainable. Replacing this cement with a geopolymer will provide a substantial reduction in greenhouse gases. Issue When calcium is present in the system, there are competing reactions, one to form geopolymer gel and the other to form calcium silicate hydrate. To date, it has not been possible to differentiate the two phases when found together. Finding The research group has successfully identified geopolymer gel and calcium silicate hydrateusing MAS-NMR in geopolymers prepared using metakaolin with added calcium oxide. This result represents an important advancement in the characterization of geopolymers. With this achievement, it is now possible to determine the composition and amount of each phase in a geopolymer. Only with this achievement will it be possible to relate geopolymer composition to engineering properties.

  2. Leslie J. Struble, University of Illinois, DMR 1008102 29Si MAS-NMR Analysis of Geopolymer Made Using Metakaolin with 15% Ca(OH)2 Unreacted metakaolin Geopolymer gel Calcium aluminosilicate hydrate Q2(1Al) Q4(4Al) Q4(3Al) Q3(1Al) Si/Al = 2.71 Si/Al = 1.29 Q1(0Al) Q2(0Al) Q4(0Al) Q4(2Al) Q4(0Al) Q4(2Al) Q3(0Al) Q4(4Al) Q4(1Al) Q4(0Al)

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