疏浚底泥固化改性与资源化利用技术
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摘要
通过疏浚底泥固化改性使其作为路基回填土得以安全处置与资源化利用。复配CaO、Al_2O_3、聚合氯化铝(PAC)、CaSO_4制备CAS型和MCAS型固化剂,当聚丙烯酰胺(PAM)、MCAS3/1/4(CaO、PAC、CaSO_4复配摩尔比3∶1∶4)投加量分别占含水率90%底泥湿重的0.2%、1%时,室温养护7d后,固化底泥无侧限抗压强度达209.56kPa,液限小于50%,塑性指数为15.67,HJ/T299标准方法测定重金属浸出浓度低于《地表水环境质量标准》(GB3838-2002)Ⅱ类水体相关限值,符合路基回填用土性能要求。X射线衍射分析结果表明,MCAS固化剂固化底泥中有单硫型/多硫型铝酸三钙晶体3CaO·Al_2O_3·xCaSO_4·xH_2O生成,这种非水溶性晶体是促进固化底泥体系力学强度形成的关键影响因素。
In order to reuse dredged sediments as road filling materials,Ca O,Al2O3aluminiumpolychlorid( PAC) and Ca SO4 were screened and mixed to prepare CAS / MCAS solidifier. When the dosages of MCAS3 /1 /4( the compound ratio of Ca O,PAC and Ca SO4 is 3 ∶ 1 ∶ 4) and polyacrylamide( PAM) were 1 wt% and 0. 2 wt%,respectively,the unconfined compressive strength of solidified sediment was 209. 56 k Pa,liquid limit was lower than 50%,and the plastic index of it was 15. 67. According to the standard method of leaching,HJ / T299-2007,the leachable heavy metals of solidified dredged sediments were lower than the legal limits of level II( GB3838-2002). It shows that solidified sediment meets with road filling material product standards. XRD indicated that3 Ca O·Al2O3·x Ca SO4·x H2 O was generated in the dredged sediments solidified by MCAS and this kind of crystal is the key factor on the strength development of solidified dredged sediments.
In order to reuse dredged sediments as road filling materials,Ca O,Al2O3aluminiumpolychlorid( PAC) and Ca SO4 were screened and mixed to prepare CAS / MCAS solidifier. When the dosages of MCAS3 /1 /4( the compound ratio of Ca O,PAC and Ca SO4 is 3 ∶ 1 ∶ 4) and polyacrylamide( PAM) were 1 wt% and 0. 2 wt%,respectively,the unconfined compressive strength of solidified sediment was 209. 56 k Pa,liquid limit was lower than 50%,and the plastic index of it was 15. 67. According to the standard method of leaching,HJ / T299-2007,the leachable heavy metals of solidified dredged sediments were lower than the legal limits of level II( GB3838-2002). It shows that solidified sediment meets with road filling material product standards. XRD indicated that3 Ca O·Al2O3·x Ca SO4·x H2 O was generated in the dredged sediments solidified by MCAS and this kind of crystal is the key factor on the strength development of solidified dredged sediments.
引文
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[15]张春雷.基于水分转化模型的淤泥固化机理研究.南京:河海大学博士学位论文,2007Zhang Chunlei.Study of dredged sediments solidification mechanism based on water transfer model.Nanjing:Doctor Dissertation of Hohai University,2007(in Chinese)
[16]彭家惠.建筑石膏减水剂与缓凝剂作用机理研究.重庆:重庆大学博士学位论文,2004Peng Jiahui.Study on action mechanism of water reducers and retarders for building gypsum.Chongqing:Doctor Dissertation of Chongqing University,2004(in Chinese)
[2]徐明宝.不同水泥掺入比对水泥土力学性能影响.建筑施工,2008,30(10):906-907Xu Mingbao.Study on impact of different cement mix ratios on mechanical properties of cement soil.Building Construction,2008,30(10):906-907(in Chinese)
[3]Ma Jianli,Zhao Youcai,Wang Jinmei,et al.Effect of magnesium oxychloride cement on stabilization/solidification of sewage sludge.Construction and Building Materials,2010,24(1):79-83
[4]白玉恒.粉煤灰固化淤泥路用性能及填筑技术研究.上海:上海交通大学硕士学位论文,2009Bai Yuheng.Study on road performance and filling technology of solidified muddy soil.Shanghai:Master Dissertation of Shanghai Jiao Tong University,2009(in Chinese)
[5]Kaniraj S.R.,Havanagi V.G.Compressive strength of cement stabilized fly ash-soil mixtures.Cement and Concrete Research,1999,29(5):673-677
[6]赵多建,郝猛.水泥-废石膏加固海相淤泥的土工性质研究.交通标准化,2010,(11):10-14Zhao Duojian,Hao Meng.Geotechnical performance research on reinforcing marine silt using cement&waste gypsum.Transport Standardization,2010,(11):10-14(in Chinese)
[7]Valls S.,Vàzquez E.Stabilisation and solidification of sewage sludges with Portland cement.Cement and Concrete Research,2000,30(10):1671-1678
[8]Maenami H.,Shin H.,Ishida H.,et al.Hydrothermal solidification of wastes with formation of zeolites.Journal of Materials in Civil Engineering,2000,12(4):302-306
[9]柴晓利,侯琳琳.三峡上游支流梁滩河底泥重金属分布及稳定化.同济大学学报(自然科学版),2013,41(10):1519-1525Chai Xiaoli,Hou Linlin.Heavy metal distribution and stabilizing effects mechanism of Liangtan river sediments.Journal of Tongji University(Natural Science),2013,41(10):1519-1525(in Chinese)
[10]中华人民共和国交通部.JTG D30-2004公路路基设计规范.北京:人民交通出版社,2004
[11]熊厚金,林天健,李宁.岩土工程化学.北京:科学出版社,2001
[12]国家环境保护总局.GB 3838-2002地表水环境质量标准.北京:中国环境科学出版社,2002
[13]Chen Q.Y.,Tyrer M.,Hills C.D.,et al.Immobilisation of heavy metal in cement-based solidification/stabilisation:A review.Waste Management,2009,29(1):390-403
[14]Zhen Guangyin,Lu Xueqin,Cheng Xiaobo,et al.Hydration process of the aluminate 12Ca O?7Al2O3-assisted Portland cement-based solidification/stabilization of sewage sludge.Construction and Building Materials,2012,30:675-681
[15]张春雷.基于水分转化模型的淤泥固化机理研究.南京:河海大学博士学位论文,2007Zhang Chunlei.Study of dredged sediments solidification mechanism based on water transfer model.Nanjing:Doctor Dissertation of Hohai University,2007(in Chinese)
[16]彭家惠.建筑石膏减水剂与缓凝剂作用机理研究.重庆:重庆大学博士学位论文,2004Peng Jiahui.Study on action mechanism of water reducers and retarders for building gypsum.Chongqing:Doctor Dissertation of Chongqing University,2004(in Chinese)