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http://dx.doi.org/10.7843/kgs.2016.32.12.23

Crushing Characteristics of Single Particle of Recycled Aggregate from Waste Concrete  

Park, Sung-Sik (Dept. of Civil Eng., Kyungpook National Univ.)
Kim, Sang-Jung (Dept. of Civil Eng., Kyungpook National Univ.)
Moon, Hong-Duk (Dept. of Civil Eng., Gyeongnam National Univ. of Science and Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.32, no.12, 2016 , pp. 23-32 More about this Journal
Abstract
A single particle crushing test was carried out for recycled aggregates from waste concrete while demolishing various structures. When the recycled aggregates were used for backfill or road subbase materials, load-displacement and crushing characteristics were analyzed. The recycled aggregates with hydrates and aggregates were sorted into 40 mm size (75-40 mm) and 20 mm size (40-20 mm). At initial loading, their irregular surface was closed to and then crushed by loading plate. Such first crushing stage was called 'Surface crushing'. Further loading, some hydrate was crushed and detached from aggregate, and such process repeated several times. This state is called 'hydrate crushing'. The final state is called 'aggregate crushing' in which aggregate crushed and following load suddenly dropped down. As the load increased, such crushing cycle is repeated several times. The shapes of aggregates are round or square, and triangle or long shaped. Depending on their shapes and surface conditions, they crushed in different ways. The 63% of aggregates showed more than 50% load reduction due to aggregate crushing. The 90% load reduction occurred at 15% of aggregates. The 40 mm aggregate crushed at maximum load between 3.05-4.38 kN and 70% of crushed aggregates were less than 20 mm.
Keywords
Recycled aggregate; Crushing; Hydrate; Strength;
Citations & Related Records
Times Cited By KSCI : 12  (Citation Analysis)
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