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隧道建设（中英文） ›› 2023, Vol. 43 ›› Issue (6): 995-1002.DOI: 10.3973/j.issn.2096-4498.2023.06.010

• 研究与探索 • 上一篇    下一篇

泡沫改性水泥基浆液性能及影响因素研究

刘功勋1, 2， 谢康1, 2, *， 张箭3， 梁鑫1, 2   

  1. （1. 中交疏浚技术装备国家工程研究中心有限公司， 上海 200092； 2. 航道疏浚技术交通行业重点实验室，上海 200092； 3. 河海大学岩土工程科学研究所， 江苏 南京 210098）
  • 出版日期:2023-06-20 发布日期:2023-07-14
  • 作者简介:刘功勋（1978—），男，吉林省吉林市人，2010年毕业于大连理工大学，岩土工程专业，博士，高级工程师，现从事软基处理及工程泥浆有益利用等方面的研究。Email： liugongxun972@126.com。*通信作者： 谢康， Email： 157779769@qq.com。

Properties and Influencing Factors of CementBased Grout Modified by CO2 Foam

LIU Gongxun1, 2, XIE Kang1, 2, *, ZHANG Jian3, LIANG Xin1, 2   

  1. (1.CCCC National Engineering Research Center of Dredging Technology and Equipment Co.,Ltd.,Shanghai 200092,China;2.Key Laboratory of Waterway Dredging Technology,Ministry of Transport,Shanghai 200092,China;3.Geotechnical Research Institute of Hohai University,Nanjing 210098,Jiangsu,China)
  • Online:2023-06-20 Published:2023-07-14

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摘要： 为探究CO2泡沫对水泥基浆液性能的改进作用，利用CO2泡沫水泥浆替换相同水灰比的原始水泥浆，对影响浆液性能的因素进行正交试验，对浆液的水胶比、粉灰比、胶砂比和膨水比进行极差分析，综合确定影响改性浆液性能的主要因素，并确定浆液最佳配比。此外，将改性浆液与南京地铁7号线盾构施工中所使用的同步注浆浆液各项性能参数进行对比分析，并进行SEM和XRD微观机制分析。试验结果表明： 1）当浆泡比为1∶4.5，水灰比为1∶2.4，发泡气压为0.02 MPa，转速为70 r/s时，浆液抗压强度较高，且密度、析水率、相对密度等性能满足实际现场要求。2）相比非加气浆液，CO2的碳化作用使得泡沫水泥浆在较短养护时间内达到了较高的强度。极差分析结果表明： 1）浆液最佳配比为水胶比0.8，粉灰比2.0，胶砂比0.5，膨水比0.16。2）浆液凝结时间随水胶比和膨水比的增大而增加； 膨水比对浆液稠度、初始流动度和析水率的影响显著。与南京地铁7号线盾构施工中所使用的同步注浆浆液相比，改性浆液具有较低的流动性和较小的密度，稠度、初始流动度性能得以改善，凝结时间缩短，强度有较大的提高。

关键词: 水泥基CO2泡沫, 碳化作用, 浆液性能, 影响因素, 正交试验, 极差分析, 微观机制分析

Abstract: To explore the modification effect of CO2 foam on the properties of cementbased grout, the cementbased grout modified by CO2 foam is used to replace the original grout with the same watercement ratio. Then, a range analysis is conducted for the ratios of waterbinder, fly ashcement, bindersand, and bentonitewater of the slurry to comprehensively determine the main factors affecting the performance of the modified slurry and optimal mixing proportions. In addition, the performance parameters of the modified slurry are compared with those of the synchronous grouting slurry currently being used in the shield tunneling of the Nanjing metro line 7. Further, microscopic mechanism tests are performed using the scanning electron microscope and Xray diffraction. The test results show that: (1) For the slurryfoam ratio of 1∶4.5, watercement ratio of 1∶2.4, foaming pressure of 0.02 MPa, and rotational speed of 70 r/s, the compressive strength of the slurry is high, and the density, water separation rate, specific gravity, and other properties can meet the actual site requirements. (2) The carbonation of CO2 reduces the time for foamed grout to achieve a higher strength. In addition, the results of the range analysis show that the optimal waterbinder, fly ashcement, bindersand, and bentonitewater ratios are 0.8, 2.0, 0.5, and 0.16, respectively. The setting time of the slurry increases with the increasing waterbinder and bentonitewater ratios. In addition, the bentonitewater ratio has a significant effect on the consistency, initial fluidity, and water separation rate of the slurry. Compared with the synchronous grouting slurry currently being used in the shield tunneling of the Nanjing metro line 7, the modified slurry has lower fluidity and density, higher consistency, initial fluidity, density, stone rate properties, and strength, as well as a shorter setting time under the action of carbonization by the CO2 foam.

Key words: cementbased CO2 foam, carbonation effect, performance of modified slurry, influencing factors, orthogonal test, range analysis, microscopic mechanism analysis

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