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首页> 外文期刊>Construction and Building Materials >Hydration process of the aluminate 12CaO·7Al_2O_3-assisted Portland cement-based solidification/stabilization of sewage sludge
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Hydration process of the aluminate 12CaO·7Al_2O_3-assisted Portland cement-based solidification/stabilization of sewage sludge

机译：铝酸盐12CaO·7Al_2O_3硅酸盐水泥基污泥固化/稳定化的水化过程

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摘要

The high organic content in sewage sludge is the main obstacle to Portland cement-based solidification/ stabilization (S/S). A novel aluminate 12CaO·7Al_2O_3 was prepared as accelerator in order to improve the performance of cement-based S/S making the sludge disposal and recycling possible. The behavior of pastes fabricated with various mass ratios of aluminate/cement has been analyzed in terms of mechanical strength, hydration products, microstructure and leaching characteristics. The incorporation of aluminate significantly improved the cement-based S/S performance. The solid matrix obtained with the aluminate/ cement ratio of 4/6 and binder addition of 10 wt.% presented 28 day-strength of 157.2 kPa, in contrast, 25.1 kPa or so obtained for the cement only-sludge mix. X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG-DSC) and scanning electron microscopy (SEM) analysis revealed that the presence of aluminate counteracted the interference from organic matters, favored the formation of crystalline phases viz. ettringite C_6AS_3H_(32), calcite CaCO_3 and quartz, and therefore the strength development. Environmental assessment of the final products in compliance leaching tests demonstrated that the concentration of heavy metals were below the certain legal limits (GB 5085.3-2007) set in China, though the addition of aluminate slightly fell the resistance of solidified mortars to acidic environments.
机译：污水污泥中的高有机含量是硅酸盐水泥基固化/稳定化（S / S）的主要障碍。新型铝酸盐12CaO·7Al_2O_3用作促进剂，以提高水泥基S / S的性能，使污泥的处理和回收成为可能。根据机械强度，水合产物，微观结构和浸出特性，分析了以各种质量比的铝酸盐/水泥制成的浆料的行为。铝酸盐的掺入显着改善了水泥基S / S性能。铝酸盐/水泥比率为4/6，粘结剂添加量为10％（重量）时，所获得的固体基质的28天强度为157.2 kPa，相比之下，仅水泥污泥混合物获得了25.1 kPa左右的强度。 X射线衍射（XRD），热重分析-差示扫描量热法（TG-DSC）和扫描电子显微镜（SEM）分析表明，铝酸盐的存在抵消了有机物的干扰，有利于结晶相的形成。钙矾石C_6AS_3H_（32），方解石CaCO_3和石英，因此强度得到发展。最终产品在合规浸出试验中的环境评估表明，重金属的浓度低于中国设定的某些法律规定的限值（GB 5085.3-2007），尽管铝酸盐的添加会稍微降低固化砂浆对酸性环境的抵抗力。

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  • 来源
    《Construction and Building Materials》 |2012年第2012期|p.675-681|共7页
  • 作者

    Guangyin Zhen; Xueqin Lu; Xiaobo Cheng; Hua Chen; Xiaofei Yan; Youcai Zhao;

  • 作者单位

    The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering. Tongji University, Shanghai 200092, China;

    School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;

    Shanghai Municipal Sewage Company Limited, Shanghai 200233, China;

    Shanghai Municipal Sewage Company Limited, Shanghai 200233, China;

    Shanghai Municipal Sewage Company Limited, Shanghai 200233, China;

    The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering. Tongji University, Shanghai 200092, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    sewage sludge; solidification/stabilization; modifier; ettringite; leaching test;

    机译：污水污泥;固化/稳定化;修饰符钙矾石浸出试验;

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