| RESEARCH PAPER |
|
|
|
|
|
| A Mechanism Study of Loess Reinforcing by Electricity-modified Sodium Silicate |
| FANG Sheng1,2, HUANG Xuefeng1,2, ZHANG Pengcheng3, ZHOU Junpeng1, 2, GUO Nan4
|
1 Department of Civil Engineering, Logistic Engineering University, Chongqing 401311;
2 Chongqing Key Laboratory of Geomechanics & Geoenvironmental Protection, Chongqing 401311;
3 Department of Chemistry and Material Engineering, Logistic Engineering University, Chongqing 401311;
4 School of Civil Engineering,Lanzhou University of Technology, Lanzhou 730050 |
|
|
|
|
Abstract In this paper, the reinforcing of loess by electricity-modified sodium silicate was studied through the orthogonal test and single factor control experiment. From the aspects of chemical composition, mineral composition and microstructure perspectives, the paper further analyzed and discussed the mechanism of loess reinforced by electricity-modified sodium silicate. The experimental results indicated that the unconfined compressive strength of the reinforced loess was proportional to the voltage and electrifying time; as the content of Na2O and modulus kept increasing, the strength of the reinforced loess firstly decreased, then reached the lowest extreme point before it increased; amorphous phase peak groups appeared in the X-ray diffraction pattern, and as the Na2O content kept increasing, the amorphous phase and the diffraction intensity experienced a fall before a rise; the SEM images suggested that the voltage of sodium silicate can accelerate the generation of silica, which would tighten the particle skeleton and improved the soil strength by covering the soil particles and filling the gaps between particles; the accelerated surface area-porosimetry system (BET) showed that with the increase of the voltage and the electrifying time, the small pores, pore volume and pore surface area were augmented while the scale of pore size was narrowed, and the average pore size remained hardly changed.
|
|
Published:
Online: 2018-05-08
|
|
|
|
|
1 Cheng Jianji. The application of double liquefied silicide method in the buried underground cavity reinforcement engineering[J]. Chin J Rock Mech Eng,1997,16(1):78(in Chinese).
程鉴基.双液化学硅化法在埋藏型地下溶洞加固工程中的应用[J].岩石力学与工程学报,1997,16(1): 78.
2 Luo Yusheng. The foundation reinforcement in the collapsible loess region using the single fluid silicide method[J]. Shanxi Construction, 2006(7):26(in Chinese).
罗宇生.单液硅化加固湿陷性黄土地基[J].陕西建筑, 2006(7):26.
3 Lv Qingfeng, Wu Zhumin, Wang Shengxin, et al. Mechanism of temperature-modification silicification grouted loess[J]. Rock Soil Mech,2013,34(5):1293(in Chinese).
吕擎峰,吴朱敏,王生新,等.温度改性水玻璃固化黄土机制研究[J].岩土力学,2013,34(5):1293.
4 Ikeda K, Feng D, Mikltni Akira. Recent development of geopolymer technique[J]. Earth Sci Frontiers,2005,12(1):206.
5 Xiao Zunqun, Liu Baochen, Qiao Shifan, et al. Experimental research on new grouting materials of acidic water glass-calcium carbonate[J]. Rock Soil Mech,2010,31(9):2829(in Chinese).
肖尊群,刘宝琛,乔世范,等.新型酸性水玻璃-碳酸钙注浆材料试验研究[J].岩土力学,2010,31(9):2829.
6 Li Xue, Zhao Hailei, Li Xingwang, et al. Characteristics of gelation process of H2SO4waterglass system[J]. J Chem Ind Eng,2007,58(2):501(in Chinese).
李雪,赵海雷,李兴旺,等.硫酸水玻璃体系的成胶特点[J].化工学报,2007,58(2):501.
7 Yin Yaxiong, Wang Shengxin, Han Wenfeng, et al. Study on microstructure of CO2-silicification grouted loess[J]. Rock Soil Mech,2008,29(6):1629(in Chinese).
尹亚雄,王生新,韩文峰,等.加气硅化黄土的微结构研究[J].岩土力学,2008,29(6):1629.
8 Rzhanitsyn B A, Sokolovich V E, Ibragimov M N. Experience in chemical grouting of loose carbonate soils with summisoil and carbamide resin[J]. Soil Mech Foundation Eng, 1969,6(4):257.
9 Hu Liming, Wu Weiling, Wu Hui, et al. Theoretical analysis and numerical simulation of electroosmosis consolidation for soft clay[J]. Rock Soil Mech,2010,31(12):3977(in Chinese).
胡黎明,吴伟令,吴辉,等.软土地基电渗固结理论分析与数值模拟[J].岩土力学,2010,31(12):3977.
10 Hong Heqing, Hu Liming, Glend Inning Stephanie, et al. Electroo-smosis experiment of soft clay with external loading[J]. J Tsinghua University(Sci Technol),2009,49(6):825(in Chinese).
洪何清,胡黎明,Glend Inning Stephanie,等.外荷载作用下的软黏土电渗试验[J]. 清华大学学报(自然科学版),2009,49(6):825.
11 Wang Ningwei, Bai Xiaohang, Han Jianhui, et al. Field test of electrochemical modification of soft silty clay[J]. Geotechuical Luvestigatiou Surveying,2014(12):14(in Chinese).
王宁伟,白小航,韩舰辉,等.淤泥质粉质黏土电化学改性加固现场试验[J].工程勘察,2014(12):14.
12 Burnotte F, Lefebvre G, Grondin G. A case record of electroosmotic consolidation of soft clay with improved soil electrode contact[J]. Canadian Geotechnicall J,2004,41(6):1038.
13 Yang Xiaohua, Yu Yonghua. Application of cement-silicate double solution grouting in loesstunnel construction[J]. China J Highway Transport, 2004,17(2):68(in Chinese).
杨晓华 ,俞永华. 水泥-水玻璃双液注浆在黄土隧道施工中的应用[J]. 中国公路学报,2004,17(2):68.
14 Wang Shengxin, Lu Qingfeng, Wang Dekai, et al. Experimental study of clay minerals solidified by sodium silicate[J]. J Central South University(Sci Technol),2013,44(7):2656(in Chinese).
王生新,吕擎峰,王得楷,等.水玻璃固化黏土矿物的试验研究[J].中南大学学报(自然科学版),2013,44(7):2656.
15 Xiao Zunqun, Liu Baochen, Qiao Shifan, et al. Calcium carbonic acid-acid water glass grouting material and comparing test[J]. J Central South University(Sci Technol),2010,41(6):2306(in Chinese).
肖尊群,刘宝琛,乔世范,等.碳酸钙-酸性水玻璃注浆材料对比试验[J].中南大学学报(自然科学版),2010,41(6):2306. |
|
|
|
渝公网安备50019002502923号 © Editorial Office of Materials Reports.
2017, Vol. 31 
