²⁹Si and ²⁷Al MAS-NMR Studies of Fly Ash Changes during the Polymerization of Mineral Polymer

Abstract:

Mineral polymer is a new category of inorganic non-mental materials, which was manufactured from fly ash in this paper. Changes of fly ash in the polymerization can be described as: (1) Q4(0Al) is the main form of Si element in fly ash, with 67.5%content.During the solidification of mineral polymer, the content of Q4(0Al) decrease from 38.7%(3d) to 28.2%(7d) and 26%(14d), then increased to 37.8% in 28 d product; (2) the intensity of Q2(0Al) and Q3(1Al) decrease at first stage, then increase finally during the solidification of mineral polymer; (3) content of Q4(2Al)increase from 14.6%(3d), 39.2%(7d), 40.6% (14d) and decreased to 23.1% in product curing for 28 d product;(4)octahedral aluminum were the main form of Al element in fly ash, which decreased during the polymerization, simultaneously, tetrahedral aluminum increased. The experimental results provided a good basis for understanding the reactive mechanism of polymerization.

• Periodical: Advanced Materials Research (Volumes 156-157)
• Pages: 794-798
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.156-157.794
• Online since: October 2010
• Authors: Yi Miao Nie, Mao Hui Xia, Fu Sheng Niu, Shu Xian Liu
• Keywords: Existence State of Al, Existence State of Si, Fly Ash (FA), MAS-NMR, Mineral Polymer

References

[1] R. Cioffi, L. Maffucci, L. santoro: RESOUR CONSERV RECY. Vol. 40(2003), p.27.

[2] Y.M. Nie, H.W. Ma, J. Yang: GeoScience. Vol. 20 (2006), p.340. (in chinese).

[3] A Palomo.,M.W. Grutzeck.,M.T. Blanco: CEMENT CONCRETE RES. Vol. 29(1999), p.1323.

[4] J. Davidovits: Early high strength mineral polymer. USA patent4, 509, 985(1982).

[5] H.L. Zhao, Keisuke H, Yasuo M. J EUR CERAM SOC. Vol. 22(2002) , p.1483.