Selective crushing, enrichment by friction properties and hydrophobization for obtaining the sustainable blast furnace slag aggregate for road subbase

IF 6 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Ain Shams Engineering Journal Pub Date : 2024-06-21 DOI:10.1016/j.asej.2024.102928

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Abstract

Air-cooled blast furnace slag is a metallurgical waste that can be used to produce the slag aggregate for pavement subbase. Slag aggregate is much cheaper than natural stone aggregate, but differs in heterogeneity in strength (from 2 to 40 MPa), tendency to absorb water, and low resistance to freezing-thawing. The paper suggests the use of methods of enrichment by friction properties, selective crushing, and hydrophobization to increase slag aggregate resistance to freezing-thawing cycles, crushing, and water penetration. Selection of the most strength (low porous) 75 % slag aggregate grains due to enrichment by friction properties decreases the total water absorption of the sample from 4.45 % to 3.64 %, decreases the sample mass loss after tests for resistance to freezing-thawing cycles from 5.05 % to 2.82 %, reduces the aggregate crushing value (ACV) from 30.71 % up to 23.80 %. Hydrophobization of the pre-enriched slag aggregate additionally reduces its water absorption to 1.08–––1.3 %.

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通过选择性破碎、摩擦特性富集和疏水性处理，获得可持续的路基用高炉矿渣骨料

空冷高炉矿渣是一种冶金废料，可用于生产路面基层的矿渣骨料。矿渣骨料比天然石骨料便宜得多，但在强度（从 2 到 40 兆帕）的异质性、吸水倾向和低抗冻融性方面存在差异。本文建议采用摩擦特性富集、选择性破碎和疏水化等方法来提高矿渣骨料的抗冻融循环、抗破碎和抗渗水能力。通过摩擦性能富集法选择强度最高（孔隙率低）的 75% 矿渣骨料颗粒，可将样品的总吸水率从 4.45% 降至 3.64%，将抗冻融循环测试后的样品质量损失从 5.05% 降至 2.82%，将骨料压碎值 (ACV) 从 30.71% 降至 23.80%。此外，预富集矿渣骨料的疏水性还可将其吸水率降至 1.08--1.3%。

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来源期刊

Ain Shams Engineering Journal Engineering-General Engineering

CiteScore

10.80

自引率

13.30%

发文量

441

审稿时长

49 weeks

期刊介绍： in Shams Engineering Journal is an international journal devoted to publication of peer reviewed original high-quality research papers and review papers in both traditional topics and those of emerging science and technology. Areas of both theoretical and fundamental interest as well as those concerning industrial applications, emerging instrumental techniques and those which have some practical application to an aspect of human endeavor, such as the preservation of the environment, health, waste disposal are welcome. The overall focus is on original and rigorous scientific research results which have generic significance. Ain Shams Engineering Journal focuses upon aspects of mechanical engineering, electrical engineering, civil engineering, chemical engineering, petroleum engineering, environmental engineering, architectural and urban planning engineering. Papers in which knowledge from other disciplines is integrated with engineering are especially welcome like nanotechnology, material sciences, and computational methods as well as applied basic sciences: engineering mathematics, physics and chemistry.