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Experimental analysis of hydraulically bound mixtures made with waste foundry sand and steel slag

机译：铸造废砂和钢渣制成的水硬性混合物的实验分析

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摘要

This paper presents the results of a laboratory study aimed at verifying the suitability of two types of industrial waste, foundry sand and steel slag, to be recycled in the aggregate skeleton of hydraulically bound mixtures for road foundations. The investigation involved a preliminary study of the leaching, physical and mechanical properties of the by-products and then the formulation of the hydraulic mixtures, in terms of Proctor, compressive and indirect tensile strength (ITS) tests, at various curing periods. In order to obtain a better mechanical characterization, the elastic modulus of the mixtures has been evaluated through static and dynamic tests, at different curing times. The results were completely satisfactory for all the mixtures designed, especially for that characterized by 80 % of steel slag and 20 % of foundry sand; it showed a compressive and ITS, at 7 days, up to 5.6 and 0.72 MPa respectively, depending on the mix and the cement content. Since the requisites for acceptance in the Italian Specifications and Standards have been satisfied and given the positive mechanical performance, it has been verified the possibility to use industrial by-products as integral substitutes of the natural aggregate in the production of cement bound granular materials for road foundations.
机译：本文介绍了一项实验室研究的结果，旨在验证两种类型的工业废料（铸造砂和钢渣）是否适合在路基水硬性混合物的骨料框架中回收。该研究包括对副产物的浸出，物理和机械性能进行初步研究，然后在不同的固化阶段根据Proctor，压缩和间接拉伸强度（ITS）测试对液压混合物的配方进行研究。为了获得更好的机械性能，已通过静态和动态测试在不同的固化时间对混合物的弹性模量进行了评估。对于所有设计的混合物，结果都是完全令人满意的，特别是对于以80％的钢渣和20％的铸造砂为特征的混合物；它在7天时显示出抗压强度和ITS，分别高达5.6和0.72 MPa，具体取决于混合物和水泥含量。由于满足了意大利规范和标准中的接受条件并具有良好的机械性能，因此已经证实了在公路用水泥粘结的粒状材料生产中使用工业副产品作为天然骨料的不可或缺的替代品的可能性。基础。

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