Effects of erosion method and environment on mechanical properties of solidified soft soil
Jun HE1,2(),Sihao LONG1,Yuanjun ZHU1,Shiru LUO1
1. School of Civil Engineering, Architectural and Environment, Hubei University of Technology, Wuhan 430068, China 2. Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake, Ministry of Education, Hubei University of Technology, Wuhan 430068, China
Soda residue (SR)-ground granulated blast furnace slag (GGBS)-carbide slag (CS) and cement were used as solidifiers of soft soil. Different erosion environments (Na2SO4, MgSO4 and seawater) and erosion modes (full immersion, semi-immersion and soil erosion) were set up. Unconfined compressive strength, X-ray diffraction and scanning electron microscope tests were carried out to study the effects of solidifier, erosion mode and environment on the erosion resistance of the solidified soft soil. Results showed that, under the same erosion mode and environment, the integrity and the strength of SR-GGBS-CS solidified soft soil were greater than those of cement-solidified soft soil. The samples in MgSO4 environment were seriously damaged and the strength values were the lowest. The integrity and the strength of cement-solidified soft soil in the semi-immersion mode were better than those in the full-immersion mode. Although the appearance of SR-GGBS-CS solidified soft soil was relatively complete in the semi-immersion mode, the strength in the semi-immersion mode was lower than that in the full-immersion mode. The strength of solidified soft soil was high in soil erosion mode. A large amount of thaumasite was generated in the soaking area of cement-solidified soft soil, contributing to its lowest strength in the full-immersion mode. As for SR-GGBS-CS solidified soft soil, more thaumasite generation and salt crystallization in the non-immersed zone resulted in the lowest strength in the semi-immersion mode. The semi-immersion became the most dangerous erosion mode for SR-GGBS-CS solidified soft soil.
Jun HE,Sihao LONG,Yuanjun ZHU,Shiru LUO. Effects of erosion method and environment on mechanical properties of solidified soft soil. Journal of ZheJiang University (Engineering Science), 2024, 58(9): 1857-1865.
Tab.2Appearance of samples after 28 days erosion under different erosion methods and environments
Fig.2Effect of erosion mode and solution on mass of solidified soft soil
Fig.3Stress-strain curve for sample S20G10 under different erosion methods and environments
Fig.4Stress-strain curve for sample C10 under different erosion methods and environments
Fig.5Unconfined compression strength of solidified soft soil under different erosion methods and environments
侵蚀方式和环境
试样
外观破损程度
质量变化率
强度
侵蚀溶液一定
S20G10
半浸泡<全浸泡
半浸泡<全浸泡
半浸泡<全浸泡
C10
半浸泡<全浸泡
半浸泡<全浸泡
全浸泡<半浸泡
侵蚀方式一定
S20G10
Na2SO4≈海水<MgSO4
Na2SO4<海水<MgSO4
MgSO4<海水<Na2SO4
C10
海水<Na2SO4< MgSO4
MgSO4≈海水<Na2SO4
MgSO4<Na2SO4<海水
Tab.3Comparison of integrity, mass change rate and strength of samples
Fig.6Unconfined compression strength of samples with three solidifier mass fractions
Fig.7XRD patterns of samples under different erosion methods and environments
Fig.8SEM photos of S20G10 sample in soaking zone of MgSO4 solution
[1]
YANG J J, YAN N, LIU Q, et al Laboratory test on long-term deterioration of cement soil in seawater environment[J]. Journal of Tianjin University, 2016, 22: 132- 138
[2]
闫楠, 杨俊杰 海水浸泡下水泥土强度衰减室内试验研究[J]. 中南大学学报: 自然科学版, 2017, 48 (1): 191- 202 YAN Nan, YANG Junjie Laboratory experimental study on strength attenuation of cement soil under seawater immersion[J]. Journal of Central South University: Natural Science Edition, 2017, 48 (1): 191- 202
[3]
闫楠, 杨俊杰, 刘强, 等 海水环境下水泥土强度衰减过程室内试验研究[J]. 土木工程学报, 2017, 50 (11): 115- 124 YAN Nan, YANG Junjie, LIU Qiang, et al Indoor experimental study on strength attenuation process of cement soil in seawater[J]. China Civil Engineering Journal, 2017, 50 (11): 115- 124
[4]
白晓红, 赵永强, 韩鹏举, 等 污染环境对水泥土力学特性影响的试验研究[J]. 岩土工程学报, 2007, (8): 1260- 1263 BAI Xiaohong, ZHAO Yongqiang, HAN Pengju, et al Experimental study on the influence of polluted environment on the mechanical properties of cement soil[J]. Chinese Journal of Geotechnical Engineering, 2007, (8): 1260- 1263
doi: 10.3321/j.issn:1000-4548.2007.08.024
[5]
韩鹏举, 白晓红, 赵永强, 等 Mg2+和SO42-相互影响对水泥土强度影响的试验研究[J]. 岩土工程学报, 2009, 31 (1): 72- 76 HAN Pengju, BAI Xiaohong, ZHAO Yongqiang, et al Experimental study on the influence of interaction between Mg2 + and SO42− on the strength of cement soil[J]. Chinese Journal of Geotechnical Engineering, 2009, 31 (1): 72- 76
doi: 10.3321/j.issn:1000-4548.2009.01.012
[6]
刘泉声, 柳志平, 程勇, 等 水泥土在侵蚀环境中的试验研究和等效分析[J]. 岩土力学, 2013, 34 (7): 1854- 1860 LIU Quansheng, LIU Zhiping, CHENG Yong, et al Experimental study and equivalent analysis of cemented soil in erosion environment[J]. Rock and Soil Mechanics, 2013, 34 (7): 1854- 1860
[7]
PHAM V N, TUMER B, HUANG J, et al Long-term strength of soil-cement columns in coastal areas[J]. Soils and Foundations, 2017, 57: 645- 654
doi: 10.1016/j.sandf.2017.04.005
[8]
HE J, LI Z X, WANG X Q, et al Durability of soft soil treated with soda residue and ground granulated blast furnace slag in a soaking environment[J]. Journal of Materials in Civil Engineering, 2020, 32 (3): 06019018
doi: 10.1061/(ASCE)MT.1943-5533.0003033
杨俊杰, 董猛荣, 孙涛, 等 现场条件下水泥土劣化试验及劣化深度预测[J]. 中国水利水电科学研究院学报, 2017, 15 (4): 297- 302 YANG Junjie, DONG Mengrong, SUN Tao, et al Cement soil degradation test and degradation depth prediction under field conditions[J]. Journal of China Institute of Water Resources and Hydropower Research, 2017, 15 (4): 297- 302
[11]
闫楠, 杨俊杰, 刘强, 等 原土环境下水泥土强度衰减过程室内试验研究[J]. 中国海洋大学学报: 自然科学版, 2019, 49 (8): 85- 92 YAN Nan, YANG Junjie, LIU Qiang, et al Laboratory experimental study on strength attenuation process of cement soil in original soil environment[J]. Journal of Ocean University of China: Natural Science Edition, 2019, 49 (8): 85- 92
[12]
董猛荣, 杨俊杰, 王曼, 等 海相软土场地水泥土劣化机理室内试验研究[J]. 中国海洋大学学报: 自然科学版, 2020, 50 (1): 93- 103 DONG Mengrong, YANG Junjie, WANG Man, et al Laboratory test study on deterioration mechanism of cement soil in marine soft soil site[J]. Journal of Ocean University of China: Natural Science Edition, 2020, 50 (1): 93- 103
[13]
IZUO H, NAKARAI K, KULIK D A Twenty-two-year investigation of strength development and surface deterioration of cement-treated clay in an in-situ field test[J]. Cement and Concrete Composites, 2022, 134: 104783
doi: 10.1016/j.cemconcomp.2022.104783
[14]
LUO Z, ZHANG B, ZOU J, et al Sulfate erosion resistance of slag-fly ash based geopolymer stabilized soft soil under semi-immersion condition[J]. Case Studies in Construction Materials, 2022, 17: e01506
doi: 10.1016/j.cscm.2022.e01506
[15]
朱健健, 高建明, 陈菲, 等 水泥砂浆半浸泡在NaCl-Na2SO4混合溶液中的侵蚀机理[J]. 东南大学学报: 自然科学版, 2019, 49 (5): 964- 972 ZHU Jianjian, GAO Jianming, CHEN Fei, et al Erosion mechanism of cement mortar semi-immersed in NaCl-Na2SO4 mixed solution[J]. Journal of Southeast University: Natural Science Edition, 2019, 49 (5): 964- 972
[16]
刘赞群, 裴敏, 张丰燕, 等 半浸泡在Na2SO4溶液中水泥净浆不同部位化学侵蚀产物对比[J]. 建筑材料学报, 2020, 23 (3): 485- 492 LIU Zanqun, PEI Min, ZHANG Fengyan, et al Comparison of chemical erosion products in different parts of cement paste semi-immersed in Na2SO4 solution[J]. Journal of Building Materials, 2020, 23 (3): 485- 492
[17]
NAJJAR M F, NEHDI M L, SOLIMAN A M, et al Damage mechanisms of two-stage concrete exposed to chemical and physical sulfate attack[J]. Construction and Building Materials, 2017, 137: 141- 152
doi: 10.1016/j.conbuildmat.2017.01.112
何俊, 栗志翔, 石小康, 等 侵蚀环境中碱渣-矿渣固化淤泥的力学性质[J]. 水文地质工程地质, 2019, 46 (6): 83- 89 HE Jun, LI Zhixiang, SHI Xiaokang, et al Mechanical properties of alkali slag-slag solidified sludge in erosion environment[J]. Hydrogeology and Engineering Geology, 2019, 46 (6): 83- 89
[21]
NEHDI M, HAYEK M Behavior of blended cement mortars exposed to sulfate solutions cycling in relative humidity[J]. Cement and Concrete Research, 2005, 35 (4): 731- 742
doi: 10.1016/j.cemconres.2004.05.032
[22]
马保国, 董荣珍, 高小建, 等 混凝土中Thaumasite硫酸盐侵蚀的形成与特征[J]. 铁道科学与工程学报, 2005, (1): 14- 18 MA Baoguo, DONG Rongzhen, GAO Xiaojian, et al Formation and characteristics of thaumasite sulfate attack in concrete[J]. Journal of Railway Science and Engineering, 2005, (1): 14- 18
doi: 10.3969/j.issn.1672-7029.2005.01.004
[23]
吴萌, 张云升, 刘志勇, 等 水泥基材料碳硫硅钙石型硫酸盐侵蚀的研究进展[J]. 硅酸盐学报, 2022, 50 (8): 2270- 2283 WU Meng, ZHANG Yunsheng, LIU Zhiyong, et al Research progress on thaumasite sulfate attack of cement-based materials[J]. Journal of the Chinese Ceramic Society, 2022, 50 (8): 2270- 2283
