Mechanisms of Drying Shrinkage for Alkali-Activated Slag/Metakaolin Composite Materials
LI Shuang1,2, LIU Hexin1, YANG Yong1, LI Qing1, ZHANG Zhilu1, ZHU Xiaohong1, YANG Changhui1, YANG Kai1
1 College of Materials Science and Engineering, Chongqing University, Chongqing 40045,China 2 Chengdu Institute of Product Quality Inspection Co. Ltd, Chengdu 610000,China
Abstract: This study examined influences of metakaolin, alkali concentration and curing regimes on the drying shrinkage of alkali-activated slag- metakaolin materials (AASM). The results indicated that comparing to the reference sample (no metakaolin), the mass loss of composite materials increased and the internal relative humidity decreased, when the metakaolin was added to replace the 50% slag. Meanwhile, the content of free water and reaction products with crystal structure increased in these materials, which is helpful to reduce the sensitivity of drying shrinkage to mass loss. In addition, appropriately increased of curing temperature could improve the crystal structure of reaction products, which is helpful to reduce the drying shrinkage of the materials. It was noted that AASM was eased be carbonized. Besides, too high alkali concentration (such as 10%) and too long high temperature curing time would have negative effect to drying shrinkage.
1 Sakulich A R, Anderson E, Schauer C, et al.Construction & Building Materials, 2009, 23(8), 2951. 2 Bakharev T, Sanjayan J G, Cheng Y B.Cement & Concrete Research, 2001, 31(2), 331. 3 Bakharev T, Sanjayan J G, Cheng Y B.Cement & Concrete Research, 2003, 33(10), 1607. 4 Palacios M, Puertas F.Cement & Concrete Research, 2005, 35(7), 1358. 5 Vilaplana J L, Baeza F J, Galao O, et al.Construction & Building Mate-rials, 2016, 116, 63. 6 Yang L Y, Jia Z J, Zhang Y M, et al.Cement & Concrete Composites, 2015, 57, 1. 7 Jia Z, Yang Y, Yang L, et al.Construction & Building Materials, 2018, 158, 198. 8 Ballekere Kumarappa D, Peethamparan S, Ngami M.Cement & Concrete Research, 2018, 109, 1. 9 Ye H, Radlinska A.Journal of Advanced Concrete Technology, 2016, 14(5), 245. 10 Borges P H R, Banthia N, Alcamand H A, et al.Cement & Concrete Composites, 2016, 71, 42. 11 Park S, Pour-Ghaz M.Construction & Building Materials, 2018, 182,360. 12 Hansen W.Journal of the American Ceramic Society, 1987, 70(5), 4. 13 Thomas R J, Lezama D, Peethamparan S.Cement & Concrete Research, 2017, 91, 13. 14 Bakharev T, Cheng Y B, Sanjayan J G.Cement & Concrete Research, 1999, 29(10), 1619. 15 Ye H, Radlinska A. Cement & Concrete Composites, 2017, 101, 131. 16 Kuenzel C, Vandeperre L J, Donatello S, et al.Journal of the American Ceramic Society, 2012, 95(10),3270. 17 Bernal S A,Mejía de Gutiérrez R, Provis J L.Construction & Building Materials, 2012, 33, 99. 18 Buchwald A, Hilbig H, Kaps C.Journal of Materials Science, 2007, 42(9), 3024. 19 Bernal S A, Rodríguez E D, Mejía de Gutiérrez R, et al.Journal of Materials Science, 2011, 46(16), 5477. 20 Ferone C, Colangelo F, Roviello G. Materials, 2013, 6(5),1920. 21 Haha M B, Saout G L, Winnefeld F, et al.Cement & Concrete Research, 2011, 41(3), 301.
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2021, Vol. 35 
