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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Recovering Industrial Sludge-Derived Slag as Fine Aggregate
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Recovering Industrial Sludge-Derived Slag as Fine Aggregate

机译：以细骨料的形式回收工业污泥衍生的炉渣

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摘要

This study presents the result of using melting to recover both industrial sludge slag (the main constituent of which is calcium fluoride) and water works sludge slag as fine aggregate in cement. The main characteristics of both slag and cement mortars were measured to evaluate the feasibility of using slag as aggregate. In this study, the slag replacement ratios were 0, 10, 20, 30, 40, and 50% (w/w), and the curing periods were 7, 28, and 90 days. Slag quality was determined according to the standards of fine aggregates in the ASTM specifications, and cement mortars with various slag replacement ratios were evaluated based on their compressive strength, and Toxicity Characteristic Leaching Procedure (TCLP). The crushed slag produced in this study met the ASTM standards for fine aggregate, including gravity, unit weight, absorption, and grading, and the TCLP leached concentrations are far below existing limits, establishing the safety and suitability of slag as fine aggregate. The TCLP leached concentrations of slag and cement mortar were not significantly related to the replacement ratio, and declined with increasing curing period, revealing that the hydration strongly influenced metal leaching. The compressive strength test results of the cement mortars demonstrated that the optimal replacement ratio for maximizing compressive strength was 40%. This study also discussed the effects of replacement ratio and curing periods on cement mortars.
机译：这项研究提出了使用熔融法回收工业污泥渣（其主要成分为氟化钙）和水厂污泥渣作为水泥细骨料的结果。测量了矿渣和水泥砂浆的主要特性，以评估将矿渣用作骨料的可行性。在这项研究中，炉渣替代率为0、10、20、30、40和50％（w / w），固化时间为7、28和90天。根据ASTM规范中的细骨料标准确定矿渣质量，并根据其抗压强度和毒性特征浸出程序（TCLP）评估具有各种矿渣替代率的水泥砂浆。这项研究中产生的碎渣符合ASTM的细骨料标准，包括重力，单位重量，吸收率和分级，并且TCLP的浸出浓度远低于现有限值，从而确定了细粒骨料的安全性和适用性。矿渣和水泥砂浆的TCLP浸出浓度与置换率没有显着关系，并且随着固化时间的增加而下降，这表明水合作用强烈地影响金属浸出。水泥砂浆的抗压强度试验结果表明，最大抗压强度的最佳替代率为40％。这项研究还讨论了更换比例和固化时间对水泥砂浆的影响。

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