A specially designed cleaning system was adopted to wash away mud but keep coarse particles and stone powders in quarry waste. Then the cleaned quarry waste was used as concrete fine aggregate. Size distributions of all concrete constituents were analyzed, and workability and compressive strength of concrete were determined to evaluate gradation effect of cleaned quarry waste to improve size distributions of concrete constituents, thus improving concrete properties. Results showed that the designed cleaning system can wash away mud and keep stone powders and coarse particles in quarry waste. The particle sizes of stone powders were between 0.075 mm and 0.15 mm, and those of coarse particles were between 0.15 mm and 4.75 mm. When the cleaned quarry waste was used, continuous size distributions of all concrete constituents were formed, which solved discontinuous size distribution problems among cement, fine, and coarse aggregates. Therefore, concrete workability was improved and compressive strengths at different ages were increased.

中文翻译：

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清洁采石场废物的分级效应，以改善混凝土成分的尺寸分布

采用了专门设计的清洁系统来洗净泥浆，但保留采石场废物中的粗颗粒和石粉。然后将清洁后的采石场废料用作混凝土细骨料。分析了所有混凝土成分的尺寸分布，确定了混凝土的可加工性和抗压强度，以评估清洁采石场废物的分级效果，以改善混凝土成分的尺寸分布，从而改善混凝土性能。结果表明，设计的清洁系统可以洗净泥土，并在采石场废物中保留石粉和粗颗粒。石粉的粒径在0.075mm至0.15mm之间，而粗粒的粒径在0.15mm至4.75mm之间。当使用清洁后的采石场废物时，所有混凝土成分均形成连续的尺寸分布，解决了水泥，细骨料和粗骨料之间尺寸不连续的问题。因此，提高了混凝土的可加工性，并增加了不同龄期的抗压强度。