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碱性氧化剂对水泥固化淤泥强度的影响研究

王臻华, 项伟, 吴雪婷, 崔德山

王臻华, 项伟, 吴雪婷, 崔德山. 碱性氧化剂对水泥固化淤泥强度的影响研究[J]. 岩土工程学报, 2019, 41(4): 693-699. DOI: 10.11779/CJGE201904012
引用本文: 王臻华, 项伟, 吴雪婷, 崔德山. 碱性氧化剂对水泥固化淤泥强度的影响研究[J]. 岩土工程学报, 2019, 41(4): 693-699. DOI: 10.11779/CJGE201904012
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WANG Zhen-hua, XIANG Wei, WU Xue-ting, CUI De-shan. Influences of alkaline oxidant on strength of cement-stabilized sludge[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(4): 693-699. DOI: 10.11779/CJGE201904012
Citation: WANG Zhen-hua, XIANG Wei, WU Xue-ting, CUI De-shan. Influences of alkaline oxidant on strength of cement-stabilized sludge[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(4): 693-699. DOI: 10.11779/CJGE201904012
shu

碱性氧化剂对水泥固化淤泥强度的影响研究  English Version

  • 1. 中国地质大学(武汉)工程学院,湖北 武汉 430074;
    2. 中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心,湖北 武汉 430074

基金项目: 国家自然科学基金项目（4167020615,41602319）
详细信息
    作者简介:

    王臻华(1993- ),男,硕士研究生,主要从事土力学及特殊土改良研究。E-mail：wangzhenhua001@icloud.com。

    通讯作者:

    项伟，E-mail：xiangwei@cug.edu.cn

  • 中图分类号: TU411

Influences of alkaline oxidant on strength of cement-stabilized sludge

  • 1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
    2. Three Gorges Research Center for Geo-hazard, Ministry of Education, China University of Geosciences, Wuhan 430074, China

摘要

    摘要
  • 摘要: 为消除淤泥中有机质对水泥固化淤泥的不利影响,提出了氧化降解有机质、减薄双电层厚度、维持pH值稳定等对策来提高水泥固化淤泥的强度。采用高铁酸钾和碳酸氢钠作为碱性氧化剂,配合水泥对淤泥进行固化处理。通过无侧限抗压强度试验,初步了解碱性氧化剂对水泥固化淤泥强度的影响规律,并利用有机元素试验、动电电位试验、比表面积试验和SEM等手段,进一步探究碱性氧化剂的固化机理。研究结果表明：掺碱性氧化剂的水泥固化淤泥7 d无侧限抗压强度达到了1.536 MPa。碳酸氢钠通过中和有机酸,维持水泥固化淤泥为pH=9~10的碱性环境;该条件下,高铁酸钾能高效降解有机质,除去黏土颗粒表面聚合态的有机质胶膜,有利于SiO2与Al2O3游离于孔隙溶液中,促进水泥水化产物的生成。同时,孔隙溶液中游离的高价阳离子与黏土颗粒表面低价阳离子交换吸附,减薄双电层厚度,引起土颗粒的絮凝团聚。
    Abstract: In order to eliminate the adverse effects of organic matter on the treatment of sludge with cement, the countermeasures to increase the strength of cement-stabilized sludge are put forward, including degrading organic matter, reducing thickness of double electric layers and maintaining pH value steadily. The potassium ferrate and sodium bicarbonate are used as the alkaline oxidant to treat the sludge with cement. Through the unconfined compressive strength tests, the influences of alkaline oxidant on the strength of cement-stabilized sludge are understood preliminarily. The solidification mechanism of alkaline oxidant is studied by means of the organic element tests, electrokinetic potential tests, specific surface area tests and SEM. The experimental results show that the unconfined compressive strength of cement-stabilized sludge can reach 1.536 MPa after curing for 7 days using the alkaline oxidant. The sodium bicarbonate maintains the cement-stabilized sludge in an alkaline environment with the pH value at 9 to 10 by neutralizing organic acids. Under this condition, the potassium ferrate can degrade organic matter effectively. Thus, the removal of the organic matter shell on the surface of clay particles is conducive to free SiO2 and Al2O3 to dissolve into the pore solution, which promotes the formation of cement hydration products. Besides, the high valence ions in pore solution replacing the low valence ions on the clay particles surface lead to a decrease in repulsion between the successive diffused double layers and the flocculation of soil particles.
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  • 收稿日期:  2018-01-14
  • 发布日期:  2019-04-24

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