Laboratory Evaluation of Stabilization of Clay Soil with Recycled Concrete Materials for Road Construction Layers

Authors

Faculty of Civil Engineering, Imam Khomeini International University, Qazvin, Iran

10.22034/ceej.2023.56478.2259

Abstract

Expansive soils are considered as problematic soils due to their high swelling and shrinkage potential and low bearing capacity.  Cracks are usually observed in the structures based on this type of soil, which causes the instability of the structure and large settlements in the structure. Due to the scarcity of land and the rapid progress of construction, engineers have focused on construction on such soils. These lands require soil stabilization with the help of various additives to improve the subgrade and the strength characteristics of weak soils.
Soil stabilization is a technique that is used to improve and treat soil engineering properties such as strength, stiffness and compressibility of the unfavorable soil in site (Zhang et al., 2020). Subgrade improvement using mechanical and chemical techniques is very common in transportation infrastructure projects (Chakrabarti & Kodikara, 2003). Although natural materials are mainly used for mechanical stabilization of subgrade soil, there is limited past studies on the relationship with the use of RCA in subgrade soil stabilization.
In this research, the behavior of clay subgrade soil stabilized with recycled concrete aggregate (RCA) and granulated blast furnace slag (GBS) as a chemical stabilizer for use in rigid and flexible pavements has been evaluated.  At first, proctor compaction, uniaxial compressive strength and California bearing ratio tests have been conducted on different combinations of clay, RCA and GBS in order to reach the optimum additive content. RCA and GBS additives have been used in order to achieve the target uniaxial strength (28-day minimum strength of 1379kPa and 1724kPa for rigid and flexible pavements, respectively) as suggested by UFC for stabilized subgrade layers (UFC, 2004).

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References

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