Crushed Concrete Fines Recycled for Soil Modification Purposes


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Title: Crushed Concrete Fines Recycled for Soil Modification Purposes

Author(s): Torben C. Hansen and Jorgen W. Angelo

Publication: Journal Proceedings

Volume: 83

Issue: 6

Appears on pages(s): 983-987

Keywords: calcium hydroxides; clay soils; crushed concrete; fineness; lime; particle size distribution; plasticity index; recycling; soil stabilization.

Date: 11/1/1986

It has been shown experimentally that addition of crushed concrete fines may improve engineering properties of clayey soils for earthwork purposes. Such improvements go beyond what can be explained by mere mechanical stabilization due to a change in grain size distribution of the soil as a whole. It is suggested that the additional improvement is due to flocculation and coagulation of colloidal clay minerals which react with calcium hydroxide in the crusher fines to form larger grains in the silt fraction within moments of mixing of the two soils.