Research on the micro-characteristics of solidified waste sludge under the effect of three factors
-
摘要:
为揭示初始含水率、固化剂掺量和龄期3种因素对固化废弃淤泥力学性质影响的本质，以硫氧镁水泥固化废弃淤泥为研究对象，开展了不同含水率（w）、固化剂掺量（Wg）和龄期（T）条件下固化淤泥的电镜扫描试验，利用图像处理软件研究了固化淤泥的微观接触面积率（RCA）、平均丰度（Cm）和分形维数（D）受含水率、固化剂掺量和龄期的影响规律。结果发现：含水率的增加会抑制硫氧镁水泥的水化，增加固化淤泥结构的分散性，进而减小固化淤泥的接触面积率、平均丰度，提高其分形维数。而固化剂掺量和龄期有利于固化反应的发展，促进扁圆状固化产物的生成，提高固化淤泥结构的紧密性，从而增加固化淤泥的接触面积率、平均丰度，降低其分形维数。3种因素中，龄期对固化淤泥的接触面积率和分形维数影响最为显著。
Abstract:To essentially investigate the effect-mechanism of water contents (w), curing agent dosages (Wg) and ages (T) on the mechanical behavior of stabilized waste sludge, a series of Scanning Electron Microscope (SEM) tests under different w, Wg and T are conducted by taking the waste sludge solidified by magnesium oxysulfate cement as the research object. The effects of w, Wg and T on the micro-parameters of the stabilized sludge such as contact area ratio (RCA), average abundance (Cm) and fractal dimension (D) are addressed by using the Image Pro Plus. The results show that the increase in w will prevent the hydration of magnesium oxysulfate cement and enhance the dispersibility of the microstructure of the stabilized sludge, further decrease the values of RCA and Cm and improve the value of D. Among the aforementioned three factors, T has a significant influence on the development of RCA and D, and Wg plays an important role in the evolution of Cm.
-
Key words:
- solidified sludge /
- microstructure /
- contact area ratio /
- average abundance /
- fractal dimension
-
-
表 1 SEM试验方案
Table 1. Test plan of the SEM
试验编号 Wg/% w/% T/d SS0 0 50 7 S0 15 50 7 S1—S4 15 40, 45, 55, 60 7 S5—S8 5, 10, 20, 25 50 7 S9—S13 15 50 3, 5, 9, 11, 14 
下载: 导出CSV
表 2 不同含水率下固化淤泥的接触面积比
Table 2. Contact area ratio of the solidified sludge under different moisture content
试验编号 w/% ST n n3D Z SCA RCA/% S1 40 1173991 0.448 0.431 123 170246 14.5 S2 45 1173991 0.481 0.472 103 156439 13.3 S0 50 1173991 0.487 0.479 168 112026 9.5 S3 55 1173991 0.512 0.513 109 101842 8.7 S4 60 1173991 0.521 0.525 119 96127 8.2 注：ST为总像素；n为实测孔隙率；n3D为三维孔隙率； SCA为接触像素。
下载: 导出CSV
表 3 不同固化剂掺量下固化土的接触面积率
Table 3. Contact area ratio of the solidified soil under different dosage of the curing agent
试验编号 Wg/% ST n n3D Z SCA RCA/% S5 5 1173991 0.548 0.539 169 88840 7.6 S6 10 1173991 0.505 0.511 162 100879 8.6 S0 15 1173991 0.487 0.479 167 112026 9.5 S7 20 1173991 0.481 0.482 157 141446 12.0 S8 25 1173991 0.459 0.461 161 164565 14.0
下载: 导出CSV
表 4 不同龄期下固化淤泥的接触面积率
Table 4. Contact area ratio of the solidified sludge at different ages
试验编号 T/d ST n n3D Z SCA RCA/% S9 3 1173991 0.548 0.538 167 85645 7.3 S10 5 1173991 0.524 0.512 156 91412 7.8 S0 7 1173991 0.487 0.479 167 112026 9.5 S11 9 1173991 0.438 0.431 136 117039 9.9 S12 11 1173991 0.468 0.452 122 132245 12.5 S13 14 1173991 0.435 0.433 103 135532 15.4
下载: 导出CSV
-
[1] 浙江宁波创造淤泥新墙材资源化利用新模式[Z]. 北方建筑, 2017, 2（1）: 75
A new model of resource utilization of sludge wall materials set up by Ningbo city, Zhejiang Province[Z]. Northern Architecture, 2017, 2（1）: 75. （in Chinese）
[2] LORENZO G A, BERGADO D T. Fundamental parameters of cement-admixed clay—new approach[J]. Journal of Geotechnical and Geoenvironmental Engineering,2004,130(10):1042 − 1050. doi: 10.1061/(ASCE)1090-0241(2004)130:10(1042)
[3] LEE F H, LEE Y, CHEW S H, et al. Strength and modulus of marine clay-cement mixes[J]. Journal of Geotechnical and Geoenvironmental Engineering,2005,131(2):178 − 186. doi: 10.1061/(ASCE)1090-0241(2005)131:2(178)
[4] 李朝辉, 程谦恭, 王艳涛, 等. 干湿循环下石灰改良膨胀土离心模型试验研究[J]. 水文地质工程地质,2017,44(4):111 − 117. [LI Zhaohui, CHENG Qiangong, WANG Yantao, et al. A centrifugal model test study of lime-improved expansive soil under drying and wetting circles[J]. Hydrogeology & Engineering Geology,2017,44(4):111 − 117. (in Chinese with English abstract)
LI Zhaohui, CHENG Qiangong, WANG Yantao, et al. A centrifugal model test study of lime-improved expansive soil under drying and wetting circles[J]. Hydrogeology & Engineering Geology, 2017, 44(4): 111-117. (in Chinese with English abstract)
[5] 黄震, 陈铖. 改良膨胀土胀缩裂隙及与抗剪强度的关系研究[J]. 水文地质工程地质,2016,43(3):87 − 93. [HUANG Zhen, CHEN Cheng. A study of the swelling shrinkage cracks of the modified expansive soil and its relationship with the shear strength[J]. Hydrogeology & Engineering Geology,2016,43(3):87 − 93. (in Chinese with English abstract)
HUANG Zhen, CHEN Cheng. A study of the swelling shrinkage cracks of the modified expansive soil and its relationship with the shear strength[J]. Hydrogeology & Engineering Geology, 2016, 43(3): 87-93. (in Chinese with English abstract)
[6] 董邑宁, 张青娥, 徐日庆, 等. 固化剂对软土强度影响的试验研究[J]. 岩土力学,2008,29(2):475 − 478. [DONG Yining, ZHANG Qinge, XU Riqing, et al. The experimental research of strength with solidifying agent on clay[J]. Rock and Soil Mechanics,2008,29(2):475 − 478. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-7598.2008.02.035
DONG Yining, ZHANG Qinge, XU Riqing, et al. The experimental research of strength with solidifying agent on clay[J]. Rock and Soil Mechanics, 2008, 29(2): 475-478. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-7598.2008.02.035
[7] 徐日庆, 王旭, 文嘉毅, 等. 浅层淤泥质土固化剂[J]. 上海交通大学学报,2019,53(7):805 − 811. [XU Riqing, WANG Xu, WEN Jiayi, et al. Curing agent for shallow mucky soil[J]. Journal of Shanghai Jiao Tong University,2019,53(7):805 − 811. (in Chinese with English abstract)
XU Riqing, WANG Xu, WEN Jiayi, et al. Curing agent for shallow mucky soil[J]. Journal of Shanghai Jiao Tong University, 2019, 53(7): 805-811. (in Chinese with English abstract)
[8] VICHAN S, RACHAN R. Chemical stabilization of soft Bangkok clay using the blend of calcium carbide residue and biomass ash[J]. Soils and Foundations,2013,53(2):272 − 281. doi: 10.1016/j.sandf.2013.02.007
[9] 王宏伟, 王东星, 贺扬. MgO改性淤泥固化土压缩特性试验[J]. 中南大学学报(自然科学版),2017,48(8):2133 − 2141. [WANG Hongwei, WANG Dongxing, HE Yang. Experimental study on compressibility behavior of solidified dredged sludge with reactive MgO[J]. Journal of Central South University (Science and Technology),2017,48(8):2133 − 2141. (in Chinese with English abstract) doi: 10.11817/j.issn.1672-7207.2017.08.022
WANG Hongwei, WANG Dongxing, HE Yang. Experimental study on compressibility behavior of solidified dredged sludge with reactive MgO[J]. Journal of Central South University (Science and Technology), 2017, 48(8): 2133-2141. (in Chinese with English abstract) doi: 10.11817/j.issn.1672-7207.2017.08.022
[10] 朱剑锋, 饶春义, 庹秋水, 等. 硫氧镁水泥复合固化剂加固淤泥质土的试验研究[J]. 岩石力学与工程学报, 2019, 38（增刊1）: 3206 − 3214
ZHU Jianfeng, RAO Chunyi, TUO Qiushui, et al. Experimental study on the properties of the organic soil solidified by the composite magnesium oxysulfate cement-curing agent[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38（Sup 1）: 3206 − 3214. （in Chinese with English abstract）
[11] ZHU J F, XU R Q, ZHAO H Y, et al. Fundamental mechanical behavior of CMMOSC-S-C composite stabilized marine soft clay[J]. Applied Clay Science,2020,192:105635. doi: 10.1016/j.clay.2020.105635
[12] 朱剑锋, 庹秋水, 邓温妮, 等. 镁质水泥复合固化剂固化有机质土的抗压强度模型[J]. 浙江大学学报(工学版),2019,53(11):2168 − 2174. [ZHU Jianfeng, TUO Qiushui, DENG Wenni, et al. Model of compressive strength of cured organic soil solidified by magnesium cement complex curing agent[J]. Journal of Zhejiang University (Engineering Science),2019,53(11):2168 − 2174. (in Chinese with English abstract) doi: 10.3785/j.issn.1008-973X.2019.11.015
ZHU Jianfeng, TUO Qiushui, DENG Wenni, et al. Model of compressive strength of cured organic soil solidified by magnesium cement complex curing agent[J]. Journal of Zhejiang University (Engineering Science), 2019, 53(11): 2168-2174. (in Chinese with English abstract) doi: 10.3785/j.issn.1008-973X.2019.11.015
[13] 饶春义, 朱剑锋, 庹秋水, 等. 镁质水泥固化淤泥一维压缩特性研究[J]. 水文地质工程地质,2018,45(4):94 − 99. [RAO Chunyi, ZHU Jianfeng, TUO Qiushui, et al. A study of the 1D compression characteristics of magnesia cement silt[J]. Hydrogeology & Engineering Geology,2018,45(4):94 − 99. (in Chinese with English abstract)
RAO Chunyi, ZHU Jianfeng, TUO Qiushui, et al. A study of the 1D compression characteristics of magnesia cement silt[J]. Hydrogeology & Engineering Geology, 2018, 45(4): 94-99. (in Chinese with English abstract)
[14] 张亭亭, 李江山, 王平, 等. 磷酸镁水泥固化铅污染土的力学特性试验研究及微观机制[J]. 岩土力学, 2016, 37（增刊2）: 279 − 286
ZHANG Tingting, LI Jiangshan, WANG Ping, et al. Experimental study of mechanical and microstructure properties of magnesium phosphate cement treated lead contaminated soils[J]. Rock and Soil Mechanics, 2016, 37（Sup 2）: 279 − 286. （in Chinese with English abstract）
[15] 刘松玉, 曹菁菁, 蔡光华. 活性氧化镁碳化固化粉质黏土微观机制[J]. 岩土力学,2018,39(5):1543 − 1552. [LIU Songyu, CAO Jingjing, CAI Guanghua. Microstructural mechanism of reactive magnesia carbonated and stabilized silty clays[J]. Rock and Soil Mechanics,2018,39(5):1543 − 1552. (in Chinese with English abstract)
LIU Songyu, CAO Jingjing, CAI Guanghua. Microstructural mechanism of reactive magnesia carbonated and stabilized silty clays[J]. Rock and Soil Mechanics, 2018, 39(5): 1543-1552. (in Chinese with English abstract)
[16] 杨爱武, 胡垚, 杨少坤. 城市污泥新型固化技术及其力学特性[J]. 岩土力学,2019,40(11):4439 − 4449. [YANG Aiwu, HU Yao, YANG Shaokun. New solidification technology and mechanical properties of municipal sludge[J]. Rock and Soil Mechanics,2019,40(11):4439 − 4449. (in Chinese with English abstract)
YANG Aiwu, HU Yao, YANG Shaokun. New solidification technology and mechanical properties of municipal sludge[J]. Rock and Soil Mechanics, 2019, 40(11): 4439-4449. (in Chinese with English abstract)
[17] 朱利君, 裴向军, 张晓超, 等. 双聚材料改良黄土持水性及生态效应研究[J]. 水文地质工程地质,2020,47(4):158 − 166. [ZHU Lijun, PEI Xiangjun, ZHANG Xiaochao, et al. A study of water retention and ecological effects of loess improved by double polymers[J]. Hydrogeology & Engineering Geology,2020,47(4):158 − 166. (in Chinese with English abstract)
ZHU Lijun, PEI Xiangjun, ZHANG Xiaochao, et al. A study of water retention and ecological effects of loess improved by double polymers[J]. Hydrogeology & Engineering Geology, 2020, 47(4): 158-166. (in Chinese with English abstract)
[18] 熊路, 申向东, 薛慧君, 等. 水泥固化六价铬污染土力学性能及微观结构研究[J]. 生态与农村环境学报,2018,34(10):946 − 954. [XIONG Lu, SHEN Xiangdong, XUE Huijun, et al. Experimental research of mechanical properties and microstructure of cement solidified hexavalent chromium-contaminated soils[J]. Journal of Ecology and Rural Environment,2018,34(10):946 − 954. (in Chinese with English abstract) doi: 10.11934/j.issn.1673-4831.2018.10.012
XIONG Lu, SHEN Xiangdong, XUE Huijun, et al. Experimental research of mechanical properties and microstructure of cement solidified hexavalent chromium-contaminated soils[J]. Journal of Ecology and Rural Environment, 2018, 34(10): 946-954. (in Chinese with English abstract) doi: 10.11934/j.issn.1673-4831.2018.10.012
[19] 徐日庆, 邓祎文, 徐波, 等. 基于SEM图像的软土三维孔隙率计算及影响因素分析[J]. 岩石力学与工程学报,2015,34(7):1497 − 1502. [XU Riqing, DENG Yiwen, XU Bo, et al. Calculation of three-dimensional porosity of soft soil based on sem image[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(7):1497 − 1502. (in Chinese with English abstract)
XU Riqing, DENG Yiwen, XU Bo, et al. Calculation of three-dimensional porosity of soft soil based on sem image[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(7): 1497-1502. (in Chinese with English abstract)
[20] 徐日庆, 邓祎文, 徐波, 等. 基于SEM图像的软土接触面积定量研究[J]. 应用基础与工程科学学报,2016,24(2):295 − 303. [XU Riqing, DENG Yiwen, XU Bo, et al. Soft clay contact area quantitative research based on SEM images[J]. Journal of Basic Science and Engineering,2016,24(2):295 − 303. (in Chinese with English abstract)
XU Riqing, DENG Yiwen, XU Bo, et al. Soft clay contact area quantitative research based on SEM images[J]. Journal of Basic Science and Engineering, 2016, 24(2): 295-303. (in Chinese with English abstract)
[21] 徐日庆, 徐丽阳, 段景川, 等. 软黏土微观结构形貌与定量分析影响因子优化[J]. 中南大学学报(自然科学版),2016,47(8):2723 − 2729. [XU Riqing, XU Liyang, DUAN Jingchuan, et al. Microstructure morphology and optimization of influencing factors in quantitative analysis of soft clay[J]. Journal of Central South University (Science and Technology),2016,47(8):2723 − 2729. (in Chinese with English abstract) doi: 10.11817/j.issn.1672-7207.2016.08.025
XU Riqing, XU Liyang, DUAN Jingchuan, et al. Microstructure morphology and optimization of influencing factors in quantitative analysis of soft clay[J]. Journal of Central South University (Science and Technology), 2016, 47(8): 2723-2729. (in Chinese with English abstract) doi: 10.11817/j.issn.1672-7207.2016.08.025
[22] 张先伟, 王常明, 马栋和. 软土微观结构表面起伏的三维可视化及分形维数的计算[J]. 应用基础与工程科学学报,2012,20(1):103 − 112. [ZHANG Xianwei, WANG Changming, MA Donghe. 3D visualization and fractal dimension of soft clay's microstructure surface undulation[J]. Journal of Basic Science and Engineering,2012,20(1):103 − 112. (in Chinese with English abstract) doi: 10.3969/j.issn.1005-0930.2012.01.012
ZHANG Xianwei, WANG Changming, MA Donghe. 3D visualization and fractal dimension of soft clay's microstructure surface undulation[J]. Journal of Basic Science and Engineering, 2012, 20(1): 103-112. (in Chinese with English abstract) doi: 10.3969/j.issn.1005-0930.2012.01.012
[23] 中华人民共和国水利部. 土工试验规程: SL 237—1999[S]. 北京: 中国水利水电出版社, 1999
Ministry of Water Resources of the People’s Republic of China. Specification of soil test: SL 237—1999[S]. Beijing: China Water Power Press, 1999. （in Chinese）
[24] 胡瑞林, 李向全, 官国琳. 粘性土微结构定量模型及其工程地质特征研究[M]. 北京: 地质出版社, 1995
HU Ruilin, LI Xiangquan, GUAN Guolin. Quantitative microstructure models of clayey soils and their engineering behaviors[M]. Beijing: Geological Publishing House, 1995. （in Chinese）
[25] BURN R P. The fractal geometry of nature[J]. The Mathematical Gazette,1984,68(443):71 − 72.
[26] 徐晓鹏, 彭瑞东, 谢和平, 等. 基于SEM图像分维估算的脆性材料细观结构演化方法研究[J]. 岩石力学与工程学报,2004,23(21):3600 − 3603. [XU Xiaopeng, PENG Ruidong, XIE Heping, et al. Analysis on meso-structure evolution of brittle materials based on estimation of fractal demensions of sem images[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(21):3600 − 3603. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-6915.2004.21.007
XU Xiaopeng, PENG Ruidong, XIE Heping, et al. Analysis on meso-structure evolution of brittle materials based on estimation of fractal demensions of sem images[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(21): 3600-3603. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-6915.2004.21.007
[27] MOORE C A, DONALDSON C F. Quantifying soil microstructure using fractals[J]. Géotechnique,1995,45(1):105 − 116.
-
图(10)
表(4)
计量
- 文章访问数: 1186
- PDF下载数: 12
- 施引文献: 0