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Utilization of sewage sludge molten slag as aggregate substitute in asphalt mixtures

机译:利用污水污泥熔渣作为沥青混合料的骨料替代品

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摘要

Sewage sludge is one of the final products from wastewater treatment processes. Handling and disposal of sewage sludge has become one of the major economic and environmental concerns. Instead of simply treating and disposing, high temperature melting treatment is considered as one of the effective alternative efforts to utilize sewage sludge as reusable materials. High temperature melting is defined as the method of melting sewage sludge at temperature of about 1500°C before cooling the molten sludge to become solidified materials, known as molten slag. Past studies have shown that high temperature melting treatment could convert sewage sludge into reusable products without adverse environmental effects. The objective of this study is to evaluate the possible utilization of sewage sludge molten slag as aggregate substitute in asphalt mixtures for pavement construction applications. The whole concept of this study was designed to assess the materials characteristics and suitability, and thus to evaluate the performance of asphalt mixtures with sewage sludge molten slag as aggregate substitute in terms of Marshall stability and flow tests. Based on the conducted study, it can be concluded that sewage sludge molten slag fulfilled almost all the standard requirements for aggregates in asphalt mixtures and can be utilized as partial replacement for aggregates. Sewage sludge molten slag has shown to be able to resist wear, polishing effect and weathering actions.
机译:污水污泥是废水处理过程的最终产物之一。污水污泥的处理和处置已成为主要的经济和环境问题。高温熔融处理不是简单地进行处理和处置,而是将污水污泥用作可重复使用的材料的有效替代方法之一。高温熔融被定义为在冷却熔融污泥成为固化材料之前在约1500℃的温度下熔融污水污泥的方法,称为熔融炉渣。过去的研究表明,高温熔融处理可以将污水污泥转化为可重复使用的产品,而不会产生不利的环境影响。这项研究的目的是评估污水污泥熔渣作为沥青混合料在路面施工应用中的骨料替代品的可能利用。本研究的整个概念旨在评估材料的特性和适用性,从而从马歇尔稳定性和流量测试的角度评估含污水污泥熔融炉渣作为集料替代品的沥青混合料的性能。根据进行的研究,可以得出结论:污水污泥熔融炉渣几乎满足了沥青混合料中骨料的所有标准要求,可以用作骨料的部分替代品。污泥熔融炉渣已显示出能够抵抗磨损,抛光效果和风化作用。

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