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| Durability of Nano-Modified CFA-MSWI Fly Ash Composite Geopolymer |
1. Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Tongji University 2. Institute of environmental materials, Tongji University
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Abstract The geopolymers were explored and prepared from municipal solid waste incineration fly ash (MSWI) and class C fly ash (CFA). The durability of geopolymers modified by nano-particles of SiO2 and γ-Al2O3 was studied. The results show that the CFA-MSWI fly ash composite geopolymers have good high-temperature resistance. The negative effects of chemical corrosion on the composite geopolymers were HCl >NaOH >Na2SO4 solution. The dry shrinkage, chemical corrosion resistance and high temperature resistance could be improved by nano-particles and the effect of SiO2 was better than that of γ-Al2O3. SEM and BET results further confirmed that microstructure and pore structure of the geopolymers could be modified effectively by nano-particles whichcan reduce volume of the large pores, compact system structure, and strengthen durability of the geopolymers.
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Received: 20 August 2013
Published: 29 May 2018
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CHEN Youde, CHENG Liang, ZHENG Dexi, ZHAO Yanyan, ZHENG Jinzhao. [J]. Cement Technology, 2016, 1(6): 24-28. |
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