Preparation and microstructure characterization ofpoly-sialate-disiloxo type of geopolymeric cement
来源期刊:中南大学学报(英文版)2009年第6期
论文作者:张云升 孙伟 李宗津
文章页码:906 - 913
Key words:geopolymeric cement; poly-sialate-disiloxo; preparation; microstructure
Abstract: In order to investigate the influence of three key molar ratios (n(SiO2)/n(Al2O3), n(K2O)/n(Al2O3) and n(H2O)/n(K2O)), a total of nine potassium poly-sialate-disiloxo (K-PSDS) geopolymeric cement matrices were designed according to orthogonal design principle. Subsequently, XRD, ESEM-EDXA and MAS-NMR techniques were employed to further characterize the microstructure of the most fully reacted geopolymeric cement matrix. The experimental results show that n(K2O)/n(Al2O3) has the most significant effect on compressive strength amongst the three ratios. The highest compressive strength (20.1 MPa) can be achieved when n(SiO2)/n(Al2O3)=6.5, n(K2O)/n(Al2O3)=0.8 and n(H2O)/n(K2O)=10.0. The FTIR spectra of nine PSDS geopolymeric cement matrices also indicate that geopolymeric cement matrix with the highest strength is the most fully reacted one and possesses the largest amount of geopolymeric cement products. The microscopic analysis reveals that PSDS geopolymeric cement matrix possesses structural characteristics similar to gel substances in having a wide range of Si endowments, but predominantly the framework molecular chains of Si partially replaced by 4-coordinated Al tetrahedral.
基金信息:the National Basic Research Program of China
the National Natural Science Foundation of China
the Program for New Century Excellent Talents in University of Ministry of Education, China
J. Cent. South Univ. Technol. (2009) 16: 0906-0913
DOI: 10.1007/s11771-009-0151-y