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| Microstructure of Hydrothermally Synthesized Fly Ash-based Tobermorite Doped with Aluminum |
Xiaolu GUO1,2( ), Fanjie MENG2 |
1 Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Tongji University, Shanghai 201804, China
2 School of Materials Science and Engineering, Tongji University, Shanghai 201804, China |
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Cite this article:
Xiaolu GUO, Fanjie MENG. Microstructure of Hydrothermally Synthesized Fly Ash-based Tobermorite Doped with Aluminum. Chinese Journal of Materials Research, 2018, 32(7): 513-517.
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Abstract Microstructure and characterization of hydrothermally synthesized fly ash-based tobermorite doped with Al (FA-T) was investigated in comparison with the counterpart of hydrothermal product (T-A) synthesized from pure reagents. The results show that the interplanar spacing of (002) plane of FA-T was larger than that of T-A, correspondingly the ratio of Ca/(Si+Al) increased and the Si-content reduced. Because certain part of the doped Al was involved in the reconstruction of tobermorite structure and the rest part of Al existed in interlamellar spaces of the tobermorite structure . The wave-numbers of two absorption peaks, which belong to the bending vibration of Si-O (Q1) and Si-O-Si for FA-T, were larger than those for T-A. These mean that the chains of [SiO4]4- for FA-T were shorter than those for T-A, and the degree of polymerization of FA-T was poor. The SEM results reveal that the T-A presents as thin foils, whilst the FA-T as spherical particles wound with fibrous and lamellar tobermorite.
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Received: 15 August 2017
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| Fund: Supported by Key Special Project in National Key Research and Development Program of China during the Thirteenth Five-year Plan Period (No. 2016YFC0700802), National Natural Science Foundation of China (No. 51478328), Natural Science Foundation of Shanghai (No. 17ZR1442000) and Fundamental Research Funds for the Central Universities (No. 22120180087) |
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