Abstract: To explore the reinforcement of magnesium phosphate cement (MPC) on low liquid limit silt deposited in the Yellow River, this experiment studied the response of different MPC contents to dry soil, magnesium-phosphorus ratio m(M/P) and boric acid-magnesium oxide ratio m(BA/M) to the initial pH and conductivity of silt. The unconfined compressive strength, pH, conductivity, and hydration products of solidified soil with different ages and MPC contents were selected under defined m(M/P) and m(BA/M). Based on CT scanning technology, the pore network models of solidified soil with three kinds of MPC content were reconstructed, and the solidification mechanism was revealed by XRD phase analysis. The results show that with the increase of MPC content, the initial pH of the solidified soil decreases gradually when m(M/P) is small, while the pH increases first and then decreases when m(M/P) is significant. When the MPC content and m(M/P) were constant, with the increase of m(BA/M), the pH decreased to the lowest at a certain value (2%) and then gradually increased. Considering the low water consumption of low liquid limit silt and the need to promote hydration in the later stage, the acidic ratio (m(M/P)=1, m(BA/M)=2%) and less than 15%MPC content is recommanded. The pH increases with age and MPC content, and the conductivity decreases with pH increasing, these two have a negative exponential relationship and can qualitatively characterize hydration. The mechanical test results show that MPC can significantly improve the strength of silt, and the strength of solidified silt will increase as age and MPC content increase. The results of XRD and CT scanning show that the MPC solidification mechanism is S-Struvite and MgO cementation appearing and the interactive structure forming both between soil particles at all ages. With MPC content increasing, the bonding between soil particles is closer, and the formed soil skeleton improves the macroscopic mechanical strength. At the same time, it also expands the pore space, increases the porosity, enhances the connectivity between the pores, and increases permeability. Therefore, the solidification performance can be further improved in engineering applications by improving the pore structure.
通讯作者:
*裴妍,山东大学土建与水利学院副教授、博士研究生导师。2017年获法国里尔中央理工大学土木工程博士学位,2018年进入山东大学土建与水利学院工作至今。目前主要从事多孔介质(岩土体、混凝土等)多场耦合多尺度渗流传输、低渗/超低渗材料渗透测试理论与方法、多孔介质微细观结构特征与多尺度力学行为、地下工程防灾减灾高性能复合材料制备与性能等方面的研究工作。发表论文20余篇,包括Cement and Concrete Research、Construction and Building Materials、Engineering Structures等。peiyan@sdu.edu.cn
1 Soud’ee E, P’era J. Cement and Concrete Research, 2000, 30(2), 315. 2 Liu Y, Chen B, Hong S, et al. Powder Technology, 2022, 399, 117208. 3 Mestres G, Ginebra M P. Acta Biomaterials, 2011, 7(4), 1853. 4 Jiang Z W, Qian C, Chen Q. Construction and Building Materials, 2017, 157, 10. 5 Qiao F, Chua C K, Li Z J. Construction and Building Materials, 2010, 24(5), 695. 6 Li Y, Chen B. Construction and Building Materials, 2013, 47, 977. 7 Xin H, Zhen Y L, Tao Y, et al. Construction and Building Materials, 2019, 225, 234. 8 Le Rouzic M, Chaussadent T, Saillio M. Cement and Concrete Research, 2017, 96, 27. 9 Qin J H, Qian J S, Dai X B, et al. Journal of the American Ceramic Society, 2021, 104(6), 2799. 10 Walling S A, Provis J L. Chemical Reviews, 2016, 116(7), 4170. 11 Han C, Yang J M, Shan C M, et al. Bulletin of the Chinese Ceramic Society, 2021, 40(1), 48 (in Chinese). 韩超, 杨建明, 单春明, 等. 硅酸盐通报, 2021, 40(1), 48. 12 Wang A S. Chemically bonded phosphate ceramics:twenty first century materials with diverse applications, 2nd Ed, Elsevier, UK, 2016, pp. 29. 13 Li W, Ni P, Yi Y. Science of the Total Environment, 2019, 671, 741. 14 Hou S W, Zhang H, Yang Z J, et al. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(S1), 3123 (in Chinese). 侯世伟, 张皓, 杨镇吉, 等. 岩石力学与工程学报, 2020, 39(S1), 3123. 15 Luo Y L, Mu W H, Zhou X T, et al. Environmental Chemistry, 2021, 40(12), 3875 (in Chinese). 雒云龙, 母维宏, 周新涛, 等. 环境化学, 2021, 40(12), 3875. 16 Li P, Chen B. Construction and Building Materials, 2021, 281, 122609. 17 Zhou Q Y, Xiong B L, Yang G Q, et al. Chinese Journal of Geotechnical Engineering, 2013, 35(S2), 439 (in Chinese). 周乔勇, 熊保林, 杨广庆, 等. 岩土工程学报, 2013, 35(S2), 439. 18 Zhu Z D. Study on stabilization of silt subgrade:theory and application. Ph. D. Thesis, Southeast University, China, 2006 (in Chinese). 朱志铎. 粉土路基稳定理论与工程应用技术研究. 博士学位论文, 东南大学, 2006. 19 Zhu Z D, Liu S Y, Sun H J. Rock and Soil Mechanics, 2004, 25(7), 1155 (in Chinese). 朱志铎, 刘松玉, 孙海军. 岩土力学, 2004, 25(7), 1155. 20 Cui W, Lv G H, Liu C Y. Science Technology and Engineering, 2018, 18(8), 302 (in Chinese). 崔伟, 吕高航, 刘春阳. 科学技术与工程, 2018, 18(8), 302. 21 Yao Z Y, Ai Y Z, Shang Q S, et al. Rock and Soil Mechanics, 2008, 29(7), 1943(in Chinese). 姚占勇, 艾贻中, 商庆森, 等. 岩土力学, 2008, 29(7), 1943. 22 Wei L, Chai S X. Journal of Engineering Geology, 2018, 26(2), 407 (in Chinese). 魏丽, 柴寿喜. 工程地质学报, 2018, 26(2), 407. 23 Wang J Y, Peng L Y. Journal of Beijing University of Civil Engineering and Architecture, 2015, 31(3), 33 (in Chinese). 王剑烨, 彭丽云. 北京建筑大学学报, 2015, 31(3), 33. 24 Peng L Y, Chen X, Qi J L, et al. Materials Reports, 2024, 38(13), 1 (in Chinese). 彭丽云, 陈星, 齐吉琳, 等. 材料导报, 2024, 38(13), 1. 25 Wang L, Shen S L, Bai Y, et al. Rock and Soil Mechanics, 2010, 31(3), 743 (in Chinese). 王领, 沈水龙, 白云, 等. 岩土力学, 2010, 31(3), 743. 26 Abdelrazig B E I, Sharp J H, El-Jazairi B. Cement and Concrete Research, 1988, 18(3), 415. 27 Wang H T. Study on the high performance magnesia-phosphate cement based composites. Ph. D. Thesis, Chongqing University, China, 2006 (in Chinese). 汪宏涛. 高性能磷酸镁水泥基材料研究. 博士学位论文, 重庆大学, 2006. 28 Qin J H, Qian J S, Song Q, et al. Journal of the Chinese Ceramic Society, 2022, 50(6), 1592 (in Chinese). 秦继辉, 钱觉时, 宋庆, 等. 硅酸盐学报, 2022, 50(6), 1592. 29 You C. Hydration and hardening of magnesium phosphate cement and stability of hydration products. Ph. D. Thesis, Chongqing University, China, 2017 (in Chinese). 尤超. 磷酸镁水泥水化硬化及水化产物稳定性. 博士学位论文, 重庆大学, 2017. 30 Lahalle H, Coumes C C D, Mesbah A, et al. Cement and concrete research, 2016, 87, 77. 31 Liu J, Guo R H, Zhang Z X. Materials Reports, 2021, 35(23), 23068 (in Chinese). 刘进, 呙润华, 张增起. 材料导报, 2021, 35(23), 23068. 32 Wang Q Z, Qian J S, Qin J H, et al. Journal of the Chinese Ceramic Society, 2013, 41(11), 1493 (in Chinese). 王庆珍, 钱觉时, 秦继辉, 等. 硅酸盐学报, 2013, 41(11), 1493. 33 Yuan T L, Bing C. Construction and Building Materials, 2019, 214, 516. 34 Yang Z H, Liu S J, Wu K, et al. Materials Reports, 2023, 37(1), 118(in Chinese). 杨正宏, 刘思佳, 吴凯, 等, 材料导报, 2023, 37(1), 118. 35 Pandey A, Schwab P, Little D N. Transportation Geotechnics, 2022, 37, 100854. 36 Blunt M J, Jackson M D, Piri M, et al. Advances in Water Resources, 2002, 25, 1069. 37 Tansey J, Balhoff M T. Transport in Porous Media, 2016, 113(2), 303. 38 Fan N, Wang J, Deng C, et al. Journal of Natural Gas Science and Engineering, 2020, 81, 103384. 39 Li Y X, Wang Q, Zhang Q C, et al. Materials Reports, 2023, 37(S1), 156 (in Chinese). 李雅曦, 王琴, 张秋臣, 等. 材料导报, 2023, 37(S1), 156.
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