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Properties of low-modulus sodium silicate solution in alkali system

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Transactions of Nonferrous Metals Society of China 2021年第12期31卷 3918-3928页

作者： Xuan LIAN Zhi-hong PENG Lei-ting SHEN Tian-gui QI Qiu-sheng ZHOU Xiao-bin LI Gui-hua LIU School of Metallurgy and Environment Central South UniversityChangsha 410083China

The properties of low-modulus(m≤1)sodium silicate and pre-desilication solutions in alkali systems were studied by measuring their electrical conductivity,viscosity,and surface *** results show that the property of high concentration pre-desilication solution is similar to that of sodium silicate *** electrical conductivity of sodium silicate solution increases with increasing the temperature and silica concentration but decreases with increasing the ***,the viscosity of the solution increases with increasing the silica concentration and linearly decreases with increasing the temperature,whereas its surface tension gradually decreases with increasing silica concentration and temperature,indicating that the sodium silicate solution is an oligomer with strong surface *** room temperature,the electrical conductivity and surface tension of sodium silicate solution are higher than those of pre-desilication solution,whereas its viscosity is smaller than that of pre-desilication solution.A turning point exists at a silica concentration of 44.7 g/*** the silica concentration is less than 44.7 g/L,the ionic structure of the solution is dominated by monomeric silicate *** contrast,when the silica concentration changes from 44.7 to 50 g/L,the migration number of silicate anions significantly decreases.

关键词： sodium silicate solution electrical conductivity viscosity surface tension

Investigation on the Thermo-dynamics of Alkali-activated Carbonatite

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Journal of Wuhan University of Technology(Materials Science) 2015年第4期30卷 774-780页

作者：殷素红 WEN Ziyun YU Qijun MA Yuwei HU Jie School of Materials Science and Engineering South China University of Technology Guangdong Low Carbon Technologies Engineering Center for Building Materials South China University of Technology Guangzhou University-Tamkang University Joint Research Center for Engineering Structure Disaster Prevention and Control Guangzhou University

The thermo-dynamics of reactions between carbonatite and sodium silicate solution at ordinary temperature （25℃） were investigated. The calculated results indicate that at ordinary temperature, the reactions between dolomite, calcite, Ca2＋ and Mg2＋ in carbonatite and H4SiO4, tl3SiO4- and H2SiO42- in sodium silicate solution to form the cementitious products of hydrated calcium silicate or hydrated magnesium silicate all possibly happen; among these reactions, the reactions to form gyrolite （2CaO.3SiO2.2.5H2O） and serpentine （3MgO.2SiO2-2H20） are the most possible to occur. Further, the dissociation degree of dolomite and calcite and the activity of H3SiO4 , H2SiO42- and H4SiO4 ions are the key factors to influence the reactions.

关键词： carbonatite sodium silicate solution alkali-activation thermo-dynamics

Structure characterization for the geopolymer of sodium silicate and metakaolin

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Journal of Chongqing University 2005年第2期4卷 70-73页

作者：曹德光 Institute of Materials South China University of TechnologyGuangzhou 510641 P.R. China School of Chemistry & Chemical Engineering Guangxi University Nanning 530004 P.R. China

Geopolymers of metakaolin and sodium silicate were synthesized respectively with the ratios of the amount of SiO2 in the sodium silica solution to that of Al2O3 in metakaolinite equal to 1.0, and 0.66. The geopolymeric structures of the products were investigated by 27Al and 29Si solid-state nuclear magnetic resonances with magic-angle spinning (MAS NMR), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), differential scanning colorimetry (DSC) and scanning electron microscopy (SEM). The reaction of the Al-O sheet in meakaolinite with low-order polymerized Si-O tetrahedral units such as monomer of SiO4 yields three-dimensional structures with the Q3 Si-O tetrahedral structure and the coordination of Al(IV) in the Al-O tetrahedral structure. The geopolymers are essentially X-ray amorphous. The assays by 27Al and 29Si NMR, FTIR confirm that the active structure in the metakaolinite is the sheet of Al-O with three coordination states.

关键词： geopolymer microstructure metakaolin sodium silicate solution