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Characterizing properties of magnesium oxychloride cement concrete pavement

氯氧镁水泥混凝土路面性能表征

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Abstract

The performance of magnesium oxychloride cement concrete (MOCC) in road engineering in the arid region in northwest China was investigated over a two-year period. Two categories of MOCC pavement, light-burnt magnesia concrete road (Road-L) and dolomite concrete road (Road-D), were prepared with light-burnt magnesia and a mixture of light-burnt magnesia and caustic dolomite (1:3 by mass), respectively. Variations in the properties of the MOCC pavement, such as compressive and flexural strength, mineralogical phase, and microstructure, after being exposed to two rainy seasons in the field were monitored. The compressive strength of the cored samples were conducted after being aged for 28 d, and the compressive and flexural strength were tested at ages of 1, 2, 3, 28, 90, 180, 270, 360 and 720 d. The mineralogical phase and microstructure of the pavement were also analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results demonstrate that MOCC pavement obtained desirable compressive and flexural strengths after curing for 3 d for Road-L and 28 d for Road-D. Both of the compressive and flexural strength of Road-L and Road-D decreased slightly after experiencing two rainy seasons, with the major hydration products being 5Mg(OH)2·MgCl2·8H2O (Phase 5) and 3Mg(OH)2·MgCl2·8H2O (Phase 3). The decomposition of Phase 5 is mainly responsible for reducing the mechanical strength of the MOCC pavement.

摘要

本文用轻烧氧化镁和轻烧氧化镁与苛性白云石的混合物(质量比为1:3)制备了氯氧镁水泥混 凝土(MOCC),并将其应用于西北干旱地区道路工程中,分别修建了Road-L 和Road-D 两种MOCC 路面。通过抗压强度、抗折强度、物相组成及微观结构等性能测试,研究了MOCC 路面材料在两年 龄期内的性能变化规律。测试了28 d 龄期时试样的抗压强度,以及1、2、3、28、90、180、270、360 和720 d 龄期时预埋试件的抗压强度和抗折强度。采用X 射线衍射和扫描电镜对路面的矿物组成和微 观结构进行了分析。结果表明,养护3 d 龄期时Road-L 路段的抗压强度和抗折强度达到设计要求,而 Road-D 路段养护28 d 时达到设计要求,主要水化产物为5Mg(OH)2MgCl2 8H2O(5 相)和3Mg(OH)2MgCl28H2O(3 相)。经历两个雨季后,路段Road-L 和Road-D 的抗压强度和抗折强度均略有下降,服 役过程中5 相被雨水分解是导致MOCC 路面机械强度降低的主要原因。

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References

  1. [1]

    MAHMUT A, MEHMET Y. Influence of filler on the properties of magnesium oxychloride cement prepared from dolomite [J]. Emerging Materials Research, 2017, 6(2): 417–421. DOI: https://doi.org/10.1680/jemmr.17.00012.

  2. [2]

    WEN Jing, YU Hong-fa, LI Ying, WU Cheng-you, DONG Jin-mei, ZHENG Li-na. Effects of H3PO4 and Ca(H2PO4)2 on mechanical properties and water resistance of thermally decomposed magnesium oxychloride cement [J]. Journal of Central South University, 2013, 20(12): 3729–3735. DOI: https://doi.org/10.1007/s.11771-013-1901-4.

  3. [3]

    HUANG Ting-jie, YUAN Qiang, DENG De-hua. The role of phosphoric acid in improving the sthrength of magnesium oxychloride cement pastes with large molar ratios of H2O/MgCl2 [J]. Cement and Concrete Composites, 2019, 97: 379–386. DOI: https://doi.org/10.1016/j.cemconcomp.2019.01.013.

  4. [4]

    LI Ying, LI Zong-jin, PEI Hua-fu, YU Hong-fa. The influence of FeSO4 and KH2PO4 on the performance of magnesium oxychloride cement [J]. Construction and Building Materials, 2016, 102: 233–238. DOI: https://doi.org/10.1016/j.cobuildmat.2015.10.186.

  5. [5]

    ZHANG Zheng-yu, DAI Chang-lu, ZHANG Quan-chang, GUO Bo-zhi, LIU Wei-ling. Study on the formation mechanism of Phase 5 and Phase 3 [J]. Sci China (Ser B), 1991, (1): 82–89. (in Chinese)

  6. [6]

    DENG De-hua, ZHANG Chuan-mei. The formation mechanism of the hydrate phases in magnesium oxychloride cement [J]. Cement and Concrete Research, 1999, 29(9): 1365–1371. DOI: https://doi.org/10.1016/S0008-8846(98)00247-6.

  7. [7]

    ZHOU Xiang-ming, LI Zong-jin. Light-weight wood-magnesium oxychloride cement composite building products made by extrusion [J]. Construction and Building Materials, 2012, 27(1): 382–389. DOI: https://doi.org/10.1016/j.conbuildmat.2011.07.033.

  8. [8]

    MONTLE J, MAYHAN K. The role of magnesium oxychloride as a fire-resistive material [J]. Fire Technology, 1974, 10(3): 201–210.

  9. [9]

    WANG Yi-chao, WEI Lin-zhuo, YU Jiang-tao, YU Ke-quan. Mechanical properties of high ductile magnesium oxychloride cement-based composites after water soaking [J]. Cement and Concrete Composites, 2019, 97: 248–258. DOI: https://doi.org/10.1016/j.cemconcomp.2018.12.028.

  10. [10]

    LI Guo-zhong, YU Yan-zhen, LI Jian-quan, WANG Ying-zi, LIU Hua-shi. Experimental study on urban refuse/magnesium oxychloride cement compound floor tile [J]. Cement and Concrete Research, 2003, 33(10): 1663–1668. DOI: https://doi.org/10.1016/S0008-8846(03)00136-4.

  11. [11]

    KARIMI Y, MONSHI A. Effect of magnesium chloride concentrations on the properties of magnesium oxychloride cement for nano SiC composite purposes [J]. Ceramics International, 2011, 37(7): 2405–2410. DOI: https://doi.org/10.1016/j.ceramint.2011.05.082.

  12. [12]

    HE Ping-ping, POON C S, TSANG D C W. Effect of pulverized fuel ash and CO2 curing on the water resistance of magnesium oxychloride cement (MOC) [J]. Cement and Concrete Research, 2017, 97: 115–122. DOI: https://doi.org/10.1016/j.cemconres.2017.03.005.

  13. [13]

    HE Ping-ping, POON C S, TSANG D C W. Comparison of glass powder and pulverized fuel ash for improving the water resistance of magnesium oxychloride cement [J]. Cement and Concrete Composites, 2018, 86: 98–109. DOI: https://doi.org/10.1016/j.cemconcomp.2017.11.010.

  14. [14]

    CHAU C K, CHAN J, LI Zong-jin. Influences of fly ash on magnesium oxychloride mortar [J]. Cement and Concrete Composites, 2009, 31(4): 250–254. DOI: https://doi.org/10.1016/j.cemconcomp.2009.02.011.

  15. [15]

    LI Zong-jin, CHAU C K. Influence of molar ratios on properties of magnesium oxychloride cement [J]. Cement and Concrete Research, 2007, 37: 866–870. DOI: https://doi.org/10.1016/j.cemconres.2007.03.015.

  16. [16]

    POWER I M, DIPPLI G M, FRANCIS P S. Francis, assessing the carbon sequestration potential of magnesium oxychloride cement building materials [J]. Cement and Concrete Composites, 2017, 78: 97–107. DOI: https://doi.org/10.1016/j.cemconcomp.2017.01.003.

  17. [17]

    QIAO Hong-xia, GONG Wei, SHI Ying-ying, ELIZABETH M, WAN Ji-ru, DONG Jin-mei. Experimental study on magnesium oxychloride cement concrete [J]. Emerging Materials Research, 2016, 5(2): 248–255. DOI: https://doi.org/10.1680/jemmr.16.00012.

  18. [18]

    MISRA A K, MATHUR R. Magnesium oxychloride cement concrete [J]. Bull Mater Sci, 2007, 30(3): 239–246.

  19. [19]

    WB/T 1019-2002. Caustic burned magnesia for magnesium oxychloride cement products [S]. (in Chinese)

  20. [20]

    China meteorological data interchange platform [EB/OL]. [2017-04-24]. http://data.cma.cn/.

  21. [21]

    BILINSKI H, MATKOVIC B, MAZURANIC C, ZUNIC T. B. The formation of magnesium oxychloride phases in systems MgO-MgCl2-H2O and NaOH-MgCl2-H2O [J]. Journal of the American Ceramic Society, 1984, 67(4): 266–269. DOI: https://doi.org/10.1111/j.1151-2916.1984.tb18844.x.

  22. [22]

    DENG De-hua. The mechanism for soluble phosphates to improve the water resistance of magnesium oxychloride cement [J]. Cement and Concrete Research, 2003, 33(9): 1311–1317. DOI: https://doi.org/10.1016/S0008-8846(03)00043-7.

  23. [23]

    LI Ying, YU Hong-fa, ZHENG Li-na, WEN Jin, WU Cheng-you, TAN Yong-shan. Compressive strength of fly ash magnesium oxychloride cement containing granite wastes [J]. Construction and Building Materials, 2013, 38: 1–7. DOI: https://doi.org/10.1016/j.conbuildmat.2012.06.016.

  24. [24]

    MAZURANIC C, BILINSKI H, MATKOVIC B. Reaction products in the system MgCl2-NaOH-H2O [J]. Journal of the American Ceramic Society, 1982, 10: 523–526. DOI: https://doi.org/10.1111/j.1151-2916.1982.tb10346.x.

  25. [25]

    ZHOU Chang-jin, DONG Suo-cheng. Water quality of main rivers in the qaidam basin and water environmental protection [J]. Resources Science, 2002, 24(2): 37–41. (in Chinese)

  26. [26]

    HUANG Qing, XIAO Xue-ying, LI Ying, AN Shen-Xia, CHANG Cheng-gong, Wen Jing, ZHENG Wei-xin, DONG Jin-mei. Research on the properties of magnesium oxychloride cement prepared with simulated seawater [J]. Advances in Cement Research, 2018, 30(7): 277–284. DOI: https://doi.org/10.1680/jadcr.17.00127.

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Author information

Correspondence to Yuan Zhou 周园 or Ying Li 李颖.

Additional information

Foundation item: Project(2014-GX-A2A) supported by Major Science and Technology Projects of Qinghai Province, China; Projects(2018-NN-152, 2019-GX-165) supported by Science and Technology Achievements Transformation Project of Qinghai Province, China; Projects(2018467, 2019423) supported by the Youth Innovation Promotion Association of Chinese Academy of Sciences project supported by the High-end innovative talents Thousand talents Plan of Qinghai Province, China

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Zheng, W., Xiao, X., Chang, C. et al. Characterizing properties of magnesium oxychloride cement concrete pavement. J. Cent. South Univ. 26, 3410–3419 (2019) doi:10.1007/s11771-019-4263-8

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Key words

  • magnesium oxychloride cement concrete (MOCC)
  • pavement
  • mechanical strength
  • microstructure

关键词

  • 氯氧镁水泥混凝土
  • 路面
  • 机械强度
  • 微观结构