Laboratory evaluation of Stabilization of clay soil with recycled concrete materials for road construction layers

Authors

Imam Khomeini International University

10.22034/ceej.2023.56478.2259

Abstract

Due to the urban building constructions and the increase of developed countries, there is a continuous increase in the production of construction and demolition (C&D) wastes that is landfilled. One of these C&D wastes is recycled concrete aggregate (RCA), which can be used as a substitute for natural resources in road construction projects. Also, the waste obtained from iron and steel factories in the form of granulated blast furnace slag (GBS) can cause damage to the environment. Using such materials in road construction projects could be a solution to the environmental hazards generated from their disposal. In this research, the engineering properties of high-plasticity clay with RCA and different combination of GBS were investigated. A comprehensive series of compaction, uniaxial compression and CBR tests were performed on different mixtures. The results show that as RCA content increased, UCS values increased for clay subgrade with up to 20% RCA content and decreased after that. The subgrade soil with 20% RCA was treated with GBS to obtain a 28-days strength value of 1379kPa and 1724kPa for rigid and flexible pavements, respectively as suggested by UFC for stabilized subgrade soils. Also, the results obtained from investigating the effect of freeze-thaw cycle on the UCS of the optimum combination with different GBS content show that the F-T cycle reduces the value of the UCS from 32% to 53% after 12 F-T cycles. The result showed that adding RCA and GBS can have a positive effect on the geotechnical characteristics of clay subgrade soil .

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Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 17 September 2023

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