1 School of Civil Engineering, Qinghai University, Xining 810016, China 2 Qinghai Provincial Key Laboratory of Energy-saving Building Materials and Engineering Safety, Xining 810016, China
Abstract: The waste residue of power industry can be regenerated into a new kind of green high-performance inorganic polymer cementitious material by alkali stimulation. The fly ash geopolymers were prepared from first grade low calcium fly ash as raw materials, sodium hydroxide as composite alkaline activator, and the influence of the modulus and curing age of alkali activator on the physical properties of fly ash geopolymers was studied through unconfined compressive strength(UCS) test, X-ray diffraction test and scanning electron microscope test. The test results show that the modulus of the exciter is an important factor affecting the mechanical properties of the geopolymer samples. With the increase of modulus, the UCS of the samples first increases and then decreases. When the modulus is 1.1 at each curing age, the UCS of the samples is the highest. Under the erosion and destruction of alkaline solution, fly ash vitreous occurs through depolymer-polycondensation reaction, and the N-A-S-H gel generated fills the pores of the sample, which promotes the increase of the UCS of the sample. When the modulus is 1.1 and the curing period is 28 days, the UCS of the sample reaches the maximum value of 10.3 MPa and the microstructure of the sample is compact and integral.
1 Li T, Guthrie J T. Bioresource Technology, 2010, 101(12), 4291. 2 Singh B, Ishwarya G, Gupta M, et al. Construction & Building Mate-rials, 2015, 85,78. 3 Ducman V, Korat L. Materials Characterization, 2016, 113, 207. 4 Yin M, Bai H T, Zhou L. Bulletin of the Chinese Ceramic Society, 2014, 33(10), 2723(in Chinese). 尹 明, 白洪涛, 周 吕. 硅酸盐通报, 2014, 33(10), 2723. 5 Davidovits J. U.S. patent, US4349386, 1980. 6 Liu Q, Zang H Y, Wang J X, et al. Journal of Shandong University of Science and Technology (Natural Science Edition), 2019, 38(3), 43(in Chinese). 刘庆, 臧浩宇, 王俊祥, 等. 山东科技大学学报(自然科学版), 2019, 38(3), 43. 7 Shi C, Jiménez A F, Palomo A. Cement & Concrete Research, 2011, 41(7), 750. 8 Gebregziabiher B S, Thomas R, Peethamparan S. Cement & Concrete Composites, 2015, 55, 91. 9 Zhang Y S, Sun W, She W, et al. Journal of Wuhan University of Technology Materials Science Edition, 2009, 24(5), 819. 10 Dombrowski K, Buchwald A, Weil M. Journal of Materials Science, 2007, 42(9), 3033. 11 Peng H, Cui C, Cai C S, et al. Journal of Composite Materials, 2016, 33(12), 2954(in Chinese). 彭晖, 崔潮, 蔡春声, 等. 复合材料学报, 2016, 33(12), 2954. 12 Meng X X, Han M F, Jia Y H, et al. New Building Materials, 2011, 38(12), 67(in Chinese). 孟宪娴, 韩敏芳, 贾屹海, 等. 新型建筑材料, 2011, 38(12), 67. 13 Hu M Y, Zhu X M, Long F M. Cement and Concrete Composites, 2009, 31(10), 762. 14 Komnitsas K, Zaharaki D, Perdikatsis V. Journal of Hazardous Mate-rials, 2009, 161(2-3), 760. 15 Ministry of Construction of the People's Republic of China. Standard for test methods of ordinary concrete mechanical properties, China Building Industry Press, China, 2016(in Chinese). 中华人民共和国建设部. 普通混凝土力学性能试验方法标准, 中国建筑工业出版社, 2016. 16 Shi C J, Roy D, Krivenko P. Alkali-activated cements and concretes, American CRC Press, 2006. 17 Wang H F, Fan Z T. Physical Testing and Chemical Analysis: Chemistry Part, 2008,44(1), 47(in Chinese). 汪华方, 樊自田. 理化检验(化学分册), 2008, 44(1), 47. 18 Sun S W. Well Construction Technology, 1984(2), 26(in Chinese). 孙淑文. 建井技术, 1984(2), 26. 19 Bakharev T, Sanjayan J G, Cheng Y. Cement & Concrete Research, 1999, 29(1), 113. 20 Provis J L, Yong C Z, Duxson P, et al. Colloids and Surfaces A: Physico-chemical and Engineering Aspects, 2009, 336(1-3), 57. 21 Xue C H, Nie J H, Gao L, et al. Non-metallic Minerals, 2016, 39(2), 5(in Chinese). 薛彩红, 聂金合, 高莉, 等. 非金属矿, 2016, 39(2), 5. 22 Celik T, Marar K. Cement & Concrete Research. 1996, 26(7), 1121. 23 Murayama N, Yamamoto H, Shibata J. International Journal of Mineral Processing, 2002, 64(1), 1. 24 Lecomte I, Henrist C, Liegeois M, et al. Journal of the European Cera-mic Society, 2006, 26(16), 3789. 25 Desilva P, Sagoe-Crenstil K, Sirivivatnanon V. Cement and Concrete Research, 2007, 37(4), 512. 26 Vargas A S D, Molin D C C D, Vilela A C F, et al. Cement & Concrete Composites, 2011, 33(6), 653. 27 Zhang B, Mackenzie K J D, Brown I W M. Journal of Materials Science, 2009, 44(17),4668. 28 Jindal B B, Singhal D, Sharma S, et al. Computers & Concrete, 2017, 20(6), 683. 29 Weng L Q, Kwesi S C, Song S H, et al. Journal of the Chinese Ceramic Society, 2005, 33(3), 276(in Chinese). 翁履谦, Kwesi S C, 宋申华, 等. 硅酸盐学报, 2005, 33(3), 276.
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2022, Vol. 36 
