钙硅比对铝硅酸盐凝胶形成与特性的影响

doi:10.11896/cldb.19070122

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Abstract There are two types of reaction products for alkali-activated binders. One is an aluminum-substituted calcium silicate hydrates (C-A-S-H), and the other is a highly disordered aluminosilicate gel (N-A-S-H). However, the factors that influence the precipitation mechanism for gels have been not yet well understood. This paper reports a research on the effect of Ca/Si on the formation and properties of synthetic aluminosilicate hydrate gels as models for the gels arising in alkali-activated binders. X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermogravimetric-differential scanning calorimetry (TG-DSC) and transmission electron microscopy-energy-dispersive X-ray (TEM-EDX) were used to characterize the synthesized gels with various Ca/Si. The results obtained show that N-A-S-H gels coexisted with C-A-S-H gel at Ca/Si<0.6. When Ca/Si≥0.6, only C-A-S-H gel formed. When Ca/Si<1.4, calcium increased the content of C-A-S-H gel phase of low degree of polymerization, and reduced the structural units with high degree of polymerization. In the case of Ca/Si≥1.4, the system form silicon-rich gel rather than more C-A-S-H gel formation. The increase of Ca/Si favored in the formation of C-A-S-H instead of the highly disordered N-A-S-H gel. The results obtained in this study could provide certain theoretical basis and experimental basis for the design of the alkali-activated binder systems.

Key words： N-A-S-H gel C-A-S-H gel molar ratio of calcium to silicon microstructure

Published: 29 May 2020

CLC number:

TQ172

Fund:This work was financially supported by the National Natural Science Foundation of China (51638008, 51878263).

About author:: Lifang Qin received her B.S. degree in June 2016 from Guangxi University. She is currently pursuing her M.S. at the Institute of Civil Engineering, Hunan University under the supervision of Prof. Caijun Shi. Her research has focused on microstructural characteristics of hydration products of alkali-activated materials.
Caijun Shi is currently a Chair Professor of College of Civil Engineering, Hunan University and China Academy of Building Materials, the second National “Thousand People Plan” Specially-invited Expert, Hunan Appointed Expert, vice chairman of Asian concrete Federation, doctoral supervisor. He is an Editor-in-Chief of Journal of Sustainable Cement-based Materials, Co-Editor of Journal of Ceramics in Modern Technologies, associate editor of Journal of Materials in Civil Engineering and Journal of Chinese Ceramic Society, and an editorial board member of Cement and Concrete Research, Cement and Concrete Composites, Construction and Building Materials, Materials Reports and Journal of Buil-ding Materials.His research interests include characterization and utilization of industrial by-products and waste materials, design and testing of cement and concrete materials, development and evaluation of cement additives and concrete admixtures, and solid and hazardous waste management. He has authored/coauthored more than 320 technical papers, seven English books, three Chinese books and edited/co-edited six international conference proceedings. In recognizing his contributions to researches in waste management and concrete technology, he was elected as a fellow of International Energy Foundation in 2001, a fellow of American Concrete Institute in 2007,and a fellow of RILEM in 2016.

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Cite this article:

QIN Lifang,QU Bo,SHI Caijun, et al. Effect of Ca/Si Ratio on the Formation and Characteristics of Synthetic Aluminosilicate Hydrate Gels[J]. Materials Reports, 2020, 34(12): 12057-12063.

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http://www.mater-rep.com/EN/10.11896/cldb.19070122 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12057

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