Abstract

It is technologically and economically advisable to optimize grading of low-quality fine and very fine sand with increased content of clay and dust particles used in preparation of cemented backfill mixtures by adding blast-furnace granular slag screenings 0–5 mm in size without preliminary treatment. The relationships of the size modulus, specific grain area and clay/dust particle content of sand and the percentage of slag in the composite aggregate are obtained. It is found that with increasing percentage of slag in the composite aggregate, water demand lowers owing to the higher size modulus of the aggregate and due to the decreased content of clay particles in it. This allows production of cemented backfill mixtures at the decreased consumption of cement while the strength and flowability of the mixtures are preserved.

中文翻译：

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利用冶金废料优化回填砂分等

摘要

在技​​术上和经济上建议通过添加大小为0–5 mm的高炉颗粒炉渣筛分而不进行初步处理来优化低质量细砂和超细砂的分级，并增加水泥和回填混合物制备中使用的粘土和粉尘颗粒的含量。得到了复合骨料中砂的粒度模量，比表面积和粘土/粉尘含量与矿渣百分率之间的关系。已经发现，随着矿渣在复合骨料中的百分比增加，由于骨料的较高的模量和其中的粘土颗粒含量降低，需水量降低。这允许以降低的水泥消耗量生产水泥回填混合物，同时保持混合物的强度和流动性。