Effect of Reactive MgO on the Shrinkage Property of Alkali-activated Slag Cement
ZHENG Weihao1,2, HE Juan1,*, WU Yonghua1, SONG Xuefeng1, SANG Guochen3
1 College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2 China Construction Ready Mixed Concrete Co., Ltd., Wuhan 430074, China 3 School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China
Abstract: The effect of reactive MgO on the autogenous and drying shrinkage of NaOH and water glass activated slag cement was studied. The action mechanism of reactive MgO was revealed by hydration heat, XRD, TG/DTG and nitrogen sorption technologies. The results show that the addition of reactive MgO is not conducive to reducing the autogenous and drying shrinkage of NaOH activated slag, while an appropriate amount of reactive MgO can significantly reduce the autogenous and drying shrinkage of water glass activated slag. Reactive MgO greatly accelerates the hydration of NaOH activated slag, resulting in the increase of autogenous shrinkage. For water glass activated slag, the effect of reactive MgO on promoting hydration is weak and the autogenous shrinkage decreases. More hydration products, especially hydrotalcite, are formed by the action of reactive MgO, and also the crystallinity of C-(A)-S-H gel is improved, which is beneficial to inhibiting shrinkage. Due to the different hydration process between NaOH and water glass activated slag, the incorporation of reactive MgO causes changes in the pore structure and mesoporous volume of the hardened paste, which affects the development of autogenous and drying shrinkage.
1 Kong D Y, Zhang J Z, Ni T Y, et al. Journal of the Chinese Ceramic Society, 2009, 37(1), 151 (in Chinese). 孔德玉, 张俊芝, 倪彤元,等. 硅酸盐学报, 2009, 37(1), 151. 2 Yang C H, Liu B W, Xiang X B, et al. Journal of Building Materials, 2015, 18(1), 44 (in Chinese). 杨长辉, 刘本万, 向晓斌,等. 建筑材料学报, 2015, 18(1), 44. 3 Collins F, Sanjayan J G. Cement and Concrete Research, 2000, 30(9),1401. 4 Cartwright C, Rajabipour F, Radlińska A. Journal of Materials in Civil Engineering, 2015, 27(4), B4014007. 5 Fang Y H, Gu Y M, Kang Q B. Advanced Materials Research, 2010, 168-170, 2008. 6 Fang Y H, Liu J F, Chen Y Q. Water Science and Engineering, 2011, 4(4), 463. 7 Jin F, Gu K, Al-Tabbaa A. Construction and Building Materials, 2014, 51, 395. 8 Jin F, Al-Tabbaa A. Construction and Building Materials, 2015, 81, 58. 9 Shen W, Wang Y, Zhang T, et al. Journal of Wuhan University of Technology(Materials Science Edition), 2011, 26(1), 121. 10 Haha M B, Lothenbach B, Le Saout G, et al. Cement and Concrete Research, 2011, 41(9), 955. 11 Li Z, Liang X, Chen Y, et al. Construction and Building Materials, 2021, 278, 122397. 12 Liao Y S, Gui Y, Ke F L, et al. Journal of Building Materials, 2018, 21(3), 478 (in Chinese). 廖宜顺, 桂雨, 柯福隆,等. 建筑材料学报, 2018, 21(3), 478. 13 Li Z, Lu T, Liang X, et al. Cement and Concrete Research, 2020, 135, 106. 14 Melo-Neto A A, Cincotto M A, Repette W. Cement and Concrete Research, 2008, 38(4), 565. 15 Ye H, Radlińska A. Cement and Concrete Research, 2017, 101, 131. 16 Zhu X, Tang D, Yang K, et al. Construction and Building Materials, 2018, 175(JUN.30), 467. 17 Huang X, Long S Z. Cement, 2001(3), 5 (in Chinese). 黄新, 龙世宗.水泥, 2001(3), 5. 18 Shi C J, He F Q, Fernández-Jiménez A, et al. Journal of the Chinese Ceramic Society, 2012, 40(1), 69 (in Chinese). 史才军, 何富强, Fernández-Jiménez A,等. 硅酸盐学报, 2012, 40(1), 69. 19 Shi C, Day R L. Cement and Concrete Research, 1995, 25(6), 1333. 20 Shi C, Day R L. Cement and Concrete Research, 1996, 26(3), 439. 21 He J, Zheng W, Bai W, et al. Construction and Building Materials, 2021, 271, 121608. 22 Li Y, Bao J, Guo Y. Construction and Building Materials, 2010, 24(10), 1855. 23 Chen W, Brouwers H J H. Journal of Materials Science, 2007, 42(2), 428. 24 Gebregziabiher B S, Thomas R, Peethamparan S. Cement and Concrete Composites, 2015, 55, 91. 25 Haha M B, Le Saout G, Winnefeld F, et al. Cement and Concrete Research, 2011, 41(3), 301. 26 Su Y W, Zhang N, Lyu X J, et al. Materials Reports, 2020, 34(Z1), 271 (in Chinese). 苏岳威, 张宁, 吕宪俊,等. 材料导报, 2020, 34(Z1), 271. 27 Song S, Jennings H M. Cement and Concrete Research, 1999, 29(2), 159. 28 Frost R L, Martens W, Ding Z, et al. Journal of Thermal Analysis Calorimetry, 2003, 71(2), 429. 29 Ye H, Radlińska A. Cement Concrete Research, 2016, 88, 126. 30 Yu Y, Zhu H. Acta Materiae Compositae Sinica, 2017, 34(11), 2624 (in Chinese). 于泳, 朱涵.复合材料学报, 2017, 34(11), 2624. 31 IUPAC. Pure and Applied Chemistry, 1972, 31, 578. 32 Yuan B, Yu Q L, Dainese E, et al. Construction and Building Materials, 2017, 153, 459. 33 Li N, Zhang G F, Wang P M, et al. Journal of Building Materials, 2016, 19(4), 712 (in Chinese). 李楠, 张国防, 王培铭,等. 建筑材料学报, 2016, 19(4), 712. 34 Haha M B, Lothenbach B, Le Saout G, et al. Cement and Concrete Research, 2012, 42(1), 74. 35 Kim J K, Hilonga A, Quang D V, et al. Applied Surface Science, 2011, 258(2), 955. 36 Hwang C L, Vo D H, Tran V A, et al. Construction and Building Materials, 2018, 186, 503.
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2022, Vol. 36 
