Selective crushing, enrichment by friction properties and hydrophobization for obtaining the sustainable blast furnace slag aggregate for road subbase
Kunaev V. Bazarov B. Kadyrov A. Konakbaeva A.
September 2024Ain Shams University
Ain Shams Engineering Journal
2024#15Issue 9
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 %.
Air-cooled blast-furnace slag , Different-strength materials , Enrichment by friction properties , Road subbase , Selective crushing on a ball mill , Sustainable aggregate
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Karaganda Industrial University, Republic Ave. 30., Karaganda Region, Temirtau, Kazakhstan
Abylkas Saginov Karaganda Technical University, Ave. Nursultan Nazarbayev, 56, Karaganda, Karaganda, Kazakhstan
Karaganda Industrial University
Abylkas Saginov Karaganda Technical University
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