水泥改性固化脱水淤泥路用性能试验
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摘要
针对无法用作路基填料的对武汉东湖疏浚淤泥,结合专利技术"清淤泥浆脱水固结一体化处理方法",采用PC32.5复合硅酸盐水泥进行改性处理.考虑压实度、水泥掺量、养护龄期等主要影响因素,通过一系列室内试验,研究水泥改性固化土强度、压缩性和水稳定性随影响因素的变化规律.试验结果表明,改性固化土的最优含水率和最大干密度较固化土稍有降低,加州承载比(CBR)、无侧限抗压强度qu、压缩系数a1-2在养护初期(7d)较固化土已有显著的增加,随着养护龄期的延长,CBR、无侧限抗压强度继续增大,但增幅逐渐减小;水泥掺量对CBR、无侧限抗压强度的影响都存在明显的拐点(分别为4%和2%),超过拐点后,各指标的增长率较小;养护龄期、水泥掺量的增加并不能引起压缩系数a1-2的明显降低;提高压实度和水泥掺量对改性固化土的水稳定性均有改善作用,但经济性差,而延长养护龄期有更明显的效果.结合扫描电镜图像,对水泥改善固化土性能的机理进行分析.
A kind of complex Portland cement(PC32.5)was used to modify the pavement performances of dredged sludge from East Lake of Wuhan combined with the technology of integrated approach for dehydrated consolidation of desilting slurry.A serious of laboratory tests were conducted to investigate the influence of the degree of compaction,cement content and curing period on the deformation behavior of strength,compressibility and water stability of modified solidified sediment(MSS).Results indicate that the optimum water content and maximum dry density of the MSS are a little less than those of the SS.California Bearing Ratio(CBR),unconfined compression strength(qu),and compression coefficient(a1-2)of the MSS have obviously increment in the first 7days of curing period,thereafter CBR and qu continue to increase,but their amplifications gradually decrease.The influences behavior of cement content on both CBR and qu exist the inflection point phenomena,i.e.,the rates of increase of both CBR and qu are less after the cement contents exceed their own inflection points(4%and 2%,respectively).The compression coefficient of MSS was independent on curing period and cement content.Both degree of compaction andcement content can slightly improved the water stability of MSS,and extending the curing period of MSS showed more effective improvement.Scanning electronic mission(SEM)pictures of SS and MSS were adopted to explain the mechanism of cement improving pavement performance of SS.
A kind of complex Portland cement(PC32.5)was used to modify the pavement performances of dredged sludge from East Lake of Wuhan combined with the technology of integrated approach for dehydrated consolidation of desilting slurry.A serious of laboratory tests were conducted to investigate the influence of the degree of compaction,cement content and curing period on the deformation behavior of strength,compressibility and water stability of modified solidified sediment(MSS).Results indicate that the optimum water content and maximum dry density of the MSS are a little less than those of the SS.California Bearing Ratio(CBR),unconfined compression strength(qu),and compression coefficient(a1-2)of the MSS have obviously increment in the first 7days of curing period,thereafter CBR and qu continue to increase,but their amplifications gradually decrease.The influences behavior of cement content on both CBR and qu exist the inflection point phenomena,i.e.,the rates of increase of both CBR and qu are less after the cement contents exceed their own inflection points(4%and 2%,respectively).The compression coefficient of MSS was independent on curing period and cement content.Both degree of compaction andcement content can slightly improved the water stability of MSS,and extending the curing period of MSS showed more effective improvement.Scanning electronic mission(SEM)pictures of SS and MSS were adopted to explain the mechanism of cement improving pavement performance of SS.
引文
[1]白玉恒.粉煤灰固化淤泥路用性能及填筑技术研究[D].上海:上海交通大学,2009:1-2.BAI Yu-huan.Study on road performance and filling technology of solidified muddy soil by fly-ash[D].Shanghai:Shanghai Jiao Tong University,2009:1-2.
[2]王东星,徐卫亚.大掺量粉煤灰淤泥固化土的强度与耐久性研究[J].岩土力学,2012,33(12):3659-3664.WANG Dong-xing,XU Wei-ya.Research on strength and durability of sediments solidified with high volume fly ash[J].Rock and Soil Mechanics,2012,33(12):3659-3664.
[3]姬凤玲,朱伟,张春雷.疏浚淤泥的土工材料化处理技术的试验与探讨[J].岩土力学,2004,25(12):1999-2002.XI Feng-ling,ZHU Wei,ZHANG Chun-lei.Study of treatment technology of dredging sludge with geosynthetizing method[J].Rock and Soil Mechanics,2004,25(12):1999-2002.
[4]KANIRAJ S R,HAVANAGI V G.Compressive strength of cement stabilized fly ash-soil mixtures[J].Cement and Concrete Research,1999,29(5):673-677.
[5]黄英豪,朱伟,张春雷,等.固化淤泥重塑土力学性质及其强度来源[J].岩土力学,2009,30(05):1352-1356.HUANG Ying-hao,ZHU Wei,ZHANG Chun-lei,et al.Mechanical characteristics and strength source of remolded solidified dredged material[J].Rock and Soil Mechanics,2009,30(05):1352-1356.
[6]黄英豪,董婵,关云飞,等.击实对固化淤泥物理力学性质的影响[J].岩土工程学报,2012,34(09):1728-1733.HUANG Ying-hao,DONG Chan,GUAN Yun-fei,et al.Effect of compaction on physical and mechanical properties of solidified dredged materials[J].Chinese Journal of Geotechnical Engineering,2012,34(09):1728-1733.
[7]黄英豪,朱伟,周宣兆,等.固化淤泥压缩特性的试验研究[J].岩土力学,2012,33(2):2923-2928.HUANG Ying-hao,ZHU Wei,ZHOU Xuan-zhao,et al.Experimental study of compressibility behavior of solidified dredged material[J].Rock and Soil Mechanics,33(2):2923-2928.
[8]朱伟,冯志超,张春雷,等.疏浚泥固化处理进行填海工程的现场试验研究[J].中国港湾建设,2005,139(05):32-35.ZHU Wei,FENG Zhi-chao,ZHANG Chun-lei,et al.Field experiment of dredged spoil solidified with cement for marine reclamation works[J].China Harbour Engineering,2005,139(05):32-35.
[9]刘仁钊.基于不同固化剂作用下淤泥改良前后力学性能变化研究[D].广东工业大学,2013.LIU Ren-zhao.Based on the effect of different curing agents and the change of mechanical properties of sludge improved research[D].Guangzhou:Guangdong University of Technology,2013.
[10]BAHAR R,BENAZZOUG M,KENAI S.Performance of compacted cement-stabilized soil[J].Cement and Concrete Composites,2004,26(7):811-820.
[11]耿树泽,侯明业,赵娟娟,等.HSC301化淤泥填筑路基性能研究[J].筑路机械与施工机械化,2013,(06):49-51.GENG Shu-ze,HOU Ming-ye,ZHAO Juan-juan,el al.Study on performance of subgrade built with HSC301solidified silt[J].Road Construction and Machinery,2013,(06):49-51.
[12]孟庆山,杨超,雷学文,等.武汉东湖淤泥早强固化试验研究[J].岩土力学,2010,31(03):707-712.MENG Qing-shan,YANG Chao,LEI Xue-wen,et al.Experimental study of early solidification of sludge in East Lake,Wuhan[J].Rock and Soil Mechanics,2010,31(03):707-712.
[13]陈士强,季光明,杨国录,等.清淤泥浆脱水固结一体化处理方法:中国,CN 101746942B[P]2010-06-23.CHEN Shi-qiang,JI Guang-ming,YANG Guo-lu,et al.Integrated approach for dehydrated consolidation of desilting slurry.China CN 101746942B[P].2010-06-23.
[14]JTG E40-2007.公路土工试验规程[S].北京:人民交通出版社,2007.JTG E40-2007.The Methods of Soils for Highway Engineering[S].Beijing:China communications Press,2007.
[15]CJJ1-2008.城镇道路工程施工与质量验收规范[S].北京:中国建筑工业出版社,2008.CJJ1-2008.Code for construction and quality acceptance of road works in city and town[S].Beijing:China Architecture &Building Press,2008.
[16]JTG D30-2004.公路路基设计规范[S].北京:人民交通出版社,2004.JTG D30-2004 Specifications for Design of Highway Subgrades[S].Beijing:China communications Press,2004.
[17]JTG F10-2006.公路路基施工技术规范[S].北京:人民交通出版社,2006.JTG F10-2006.Technical specification for construction of highway subgrades[S].Beijing:China communications Press,2006.
[18]黄新,周国钧.水泥加固土硬化机理初探[J].岩土工程学报,1994,16(01):62-68.HUANG Xin,ZHOU Guo-jun.Harding mechanism of cement-stabilized soil[J].Chinese Journal of Geotechnical Engineering,1994,16(01):62-68.
[2]王东星,徐卫亚.大掺量粉煤灰淤泥固化土的强度与耐久性研究[J].岩土力学,2012,33(12):3659-3664.WANG Dong-xing,XU Wei-ya.Research on strength and durability of sediments solidified with high volume fly ash[J].Rock and Soil Mechanics,2012,33(12):3659-3664.
[3]姬凤玲,朱伟,张春雷.疏浚淤泥的土工材料化处理技术的试验与探讨[J].岩土力学,2004,25(12):1999-2002.XI Feng-ling,ZHU Wei,ZHANG Chun-lei.Study of treatment technology of dredging sludge with geosynthetizing method[J].Rock and Soil Mechanics,2004,25(12):1999-2002.
[4]KANIRAJ S R,HAVANAGI V G.Compressive strength of cement stabilized fly ash-soil mixtures[J].Cement and Concrete Research,1999,29(5):673-677.
[5]黄英豪,朱伟,张春雷,等.固化淤泥重塑土力学性质及其强度来源[J].岩土力学,2009,30(05):1352-1356.HUANG Ying-hao,ZHU Wei,ZHANG Chun-lei,et al.Mechanical characteristics and strength source of remolded solidified dredged material[J].Rock and Soil Mechanics,2009,30(05):1352-1356.
[6]黄英豪,董婵,关云飞,等.击实对固化淤泥物理力学性质的影响[J].岩土工程学报,2012,34(09):1728-1733.HUANG Ying-hao,DONG Chan,GUAN Yun-fei,et al.Effect of compaction on physical and mechanical properties of solidified dredged materials[J].Chinese Journal of Geotechnical Engineering,2012,34(09):1728-1733.
[7]黄英豪,朱伟,周宣兆,等.固化淤泥压缩特性的试验研究[J].岩土力学,2012,33(2):2923-2928.HUANG Ying-hao,ZHU Wei,ZHOU Xuan-zhao,et al.Experimental study of compressibility behavior of solidified dredged material[J].Rock and Soil Mechanics,33(2):2923-2928.
[8]朱伟,冯志超,张春雷,等.疏浚泥固化处理进行填海工程的现场试验研究[J].中国港湾建设,2005,139(05):32-35.ZHU Wei,FENG Zhi-chao,ZHANG Chun-lei,et al.Field experiment of dredged spoil solidified with cement for marine reclamation works[J].China Harbour Engineering,2005,139(05):32-35.
[9]刘仁钊.基于不同固化剂作用下淤泥改良前后力学性能变化研究[D].广东工业大学,2013.LIU Ren-zhao.Based on the effect of different curing agents and the change of mechanical properties of sludge improved research[D].Guangzhou:Guangdong University of Technology,2013.
[10]BAHAR R,BENAZZOUG M,KENAI S.Performance of compacted cement-stabilized soil[J].Cement and Concrete Composites,2004,26(7):811-820.
[11]耿树泽,侯明业,赵娟娟,等.HSC301化淤泥填筑路基性能研究[J].筑路机械与施工机械化,2013,(06):49-51.GENG Shu-ze,HOU Ming-ye,ZHAO Juan-juan,el al.Study on performance of subgrade built with HSC301solidified silt[J].Road Construction and Machinery,2013,(06):49-51.
[12]孟庆山,杨超,雷学文,等.武汉东湖淤泥早强固化试验研究[J].岩土力学,2010,31(03):707-712.MENG Qing-shan,YANG Chao,LEI Xue-wen,et al.Experimental study of early solidification of sludge in East Lake,Wuhan[J].Rock and Soil Mechanics,2010,31(03):707-712.
[13]陈士强,季光明,杨国录,等.清淤泥浆脱水固结一体化处理方法:中国,CN 101746942B[P]2010-06-23.CHEN Shi-qiang,JI Guang-ming,YANG Guo-lu,et al.Integrated approach for dehydrated consolidation of desilting slurry.China CN 101746942B[P].2010-06-23.
[14]JTG E40-2007.公路土工试验规程[S].北京:人民交通出版社,2007.JTG E40-2007.The Methods of Soils for Highway Engineering[S].Beijing:China communications Press,2007.
[15]CJJ1-2008.城镇道路工程施工与质量验收规范[S].北京:中国建筑工业出版社,2008.CJJ1-2008.Code for construction and quality acceptance of road works in city and town[S].Beijing:China Architecture &Building Press,2008.
[16]JTG D30-2004.公路路基设计规范[S].北京:人民交通出版社,2004.JTG D30-2004 Specifications for Design of Highway Subgrades[S].Beijing:China communications Press,2004.
[17]JTG F10-2006.公路路基施工技术规范[S].北京:人民交通出版社,2006.JTG F10-2006.Technical specification for construction of highway subgrades[S].Beijing:China communications Press,2006.
[18]黄新,周国钧.水泥加固土硬化机理初探[J].岩土工程学报,1994,16(01):62-68.HUANG Xin,ZHOU Guo-jun.Harding mechanism of cement-stabilized soil[J].Chinese Journal of Geotechnical Engineering,1994,16(01):62-68.