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首页> 外文会议>The 22nd International Conference on Solid Waste Technology and Management(ICSW 2007) >Effects of Sucrose and Sorbitol on Cement-based Stabilization/ Solidification of Toxic Metal Waste
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Effects of Sucrose and Sorbitol on Cement-based Stabilization/ Solidification of Toxic Metal Waste

机译：蔗糖和山梨醇对有毒金属废物水泥基稳定/固化的影响

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摘要

The effects of sucrose or sorbitol addition on the hydration, unconfined compressive strength and teachability of Portland cement pastes containing 1% Pb and 1% Zn were studied as a function of time. While Pb and Zn were found to accelerate the hydration of Portland cement, the combination of these metals with 0.15 wt% sucrose or 0.40 wt% sorbitol retarded the setting of cement by at least 7 days and 28 days, respectively, without affecting the strength at 56 days. The leachability of Pb and Zn evaluated by the TCLP 1311 protocol at 56 and 71 days was slightly reduced or unchanged by the addition of sorbitol or sucrose. SEM-EDS and XRD analyses revealed that ettringite precipitation was favored whereas the formation of CSH gel, which accounts for most of the strength of hydrated cement, was delayed in cement pastes containing both metals and sucrose or sorbitol. These results indicate that controlled additions of sorbitol or sucrose can add flexibility to the handling of cement-treated metal waste, particularly when it needs to be transported by truck or pipeline between the treatment plant and the disposal site, without affecting its long term performance.
机译：研究了蔗糖或山梨糖醇的添加对水化，无侧限抗压强度和含1％Pb和1％Zn的硅酸盐水泥浆的可教导性随时间的影响。虽然发现Pb和Zn可以促进硅酸盐水泥的水化，但这些金属与0.15 wt％的蔗糖或0.40 wt％的山梨糖醇的组合分别将水泥的凝固时间分别推迟了至少7天和28天，而不会影响水泥的强度。 56天通过添加山梨糖醇或蔗糖，通过TCLP 1311协议评估的56和71天时Pb和Zn的浸出性略有降低或保持不变。 SEM-EDS和XRD分析表明，钙矾石沉淀是有利的，而占水合水泥大部分强度的CSH凝胶的形成在同时包含金属，蔗糖或山梨醇的水泥浆中被延迟了。这些结果表明，控制添加山梨糖醇或蔗糖可以为处理水泥处理过的金属废料增加灵活性，特别是当需要通过卡车或管道在处理厂与处置场所之间运输而不影响其长期性能时。

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