Mechanical Properties and Microscopic Analysis of Nano-silica Modified Fly Ash Geopolymer
LIU Xin1, PENG Zechuan1, PAN Chenhao1, HU Xin1, WAN Chaojun1, YANG Hongyu1,2
1 College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China 2 State Key Laboratory of Green Building Materials, China Building Materials Acadermy, Beijing 100024, China
Abstract: The effects of nano-SiO2 on the setting time, fluidity and mechanical properties of fly ash-based geopolymer were investigated systematically. The microstructure of the system was tested by XRD, SEM and thermal analysis methods to investigate the polymerization of nano-SiO2 to fly ash and the mechanism of modification of the substance. The results show that the incorporation of nano-SiO2 is a decrease in the fluidity of the system, and the condensation time is shortened, and the greater the amount of the addition, the more noticeable the effect. Nano-SiO2 can improve the early compressive strength of fly ash-based geopolymer, and the suitable content of nano-SiO2 is 1% (mass fraction). The nano-SiO2 increases the compressive strength of the fly ash-based geopolymer through chemical reaction, particle filling and seed nucleation.
Davidovits J.Journal of Thermal Analysis,1989,35(2),429.2 Gao X, Yu Q L, Brouwers H.Construction and Building Materials, 2015, 98,397.3 Tom G, John D, Russell G, et al.In: Proceeding of 27th Biennial National Conference of the Concrete Institute of Australia in Conjunction With the 69th RILEM Week. Melbourne, Australia,2015, pp. 679.4 Guo X, Shi H, Chen L, et al.Journal of Hazardous Materials,2010,173,480.5 Daniel L Y K, Jay C S. Cement and Concrete Research, 2010,40(2),334.6 Chindaprasirta P, Rattanasakb U, Taebuanhuadb.Advanced Powder Technology, 2013,24(3),703.7 Peigang H, Dechang J. Meirong W, et al.Ceramics International,2011,37(1),59.8 Hussin M W. Bhutta M A R, Azreen M, et al. Materials and Structures, 2015,48(3),709.9 Cuo X, Shi H, Dick W A. Cement and Concrete Composites,2010,32(2),142.10 Temuujin J, Williams R P, Riessen A V, Journal of Materials Processing Technology, 2009,209,5276.11 Hou P Z. Effect of nano-SiO2 on hydration and hardening of cement fly ash system. Ph.D. Thesis, Chongqing University, China, 2012 (in Chinese).侯鹏坤.纳米SiO2对水泥粉煤灰体系水化硬化作用研究.博士学位论文,重庆大学,2012.12 Sato T, Diallo F. Journal of the Transportation Research Board, 2010,2141,61.13 Shekari A H, Razzaghi M S. Procedia Engineering, 2011,14,3036.14 Abdoli Y N, Arefi M R, Mollaahmadi E, et al. Life Science Journal, 2011,8(4),550.15 Guo X L, Shi H S, Xia M. Journal of Functional Materials, 2016(11),11001 (in Chinese).郭晓潞,施惠生,夏明.功能材料,2016(11),11001.16 Phoo-ngernkham T, Chindaprasirt P, Sata V, et al. Materials and Design, 2014,55,58.17 Riahi S, Nazari A. Ceramics International, 2012,38(6),4467.18 Ramezanianpour Ali Akbar, Moeini Mohammad Amin. Construction and Building Materials , 2018,163,611.19 Xie T, Ozbakkaloglu T. Ceramics International, 2015, 41(4),5945.20 Chindaprasirt P, De Silva P, Sagoe-Crentsil K, et al. Journal of Mate-rials Science, 2012,47(12),4876.21 Silva P D, Sagoe-Crenstil K. Cement and Concrete Research, 2008,38(6),870.22 Silva P D, Sagoe-Crenstil K. Journal of the Australian Ceramic Society, 2009,45(1),63.23 Weng L, Sagoe-Crentsil K. Journal of Materials Science, 2007,42(9), 2997.24 Sagoe-Crentsil K, Weng L. Journal of Materials Science, 2007,42(9),3007.25 Assaedi H, Shaikh F U A, Low I M. Construction and Building Mate-rials, 2016, 123,541.26 Adak D, Sarkar M, Mandal S. Construction and Building Materials, 2017, 135,430.27 Adak D, Sarkar M, Mandal S. Construction and Building Materials, 2014, 70,453.
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2020, Vol. 34 
