Field investigation of granular base rehabilitation project incorporating a woven geotextile separation layer, sand, and cement stabilization

Abstract

Full-depth reclamation and cement strengthening has been used successfully to dry and strengthen granular pavements. However, some thin pavements fail due to severe wetting-up of the subgrade, thus requiring additional substructure strengthening and (or) drainage systems. This research investigated the laboratory characterization and in situ field mechanical behaviour of full-depth reclaimed and cement-stabilized granular materials in conjunction with a woven geotextile and sand drainage system. This research showed that the integration of cement-stabilized reclaimed granular materials with a geotextile separation layer and sand drainage system significantly improved the mechanical primary response and climatic durability properties of the reclaimed road structure. The cement-stabilized and geotextile separation–drainage system improved the structural asset management test results from a completely failed road structure to primary plus load-carrying capacity. This research also demonstrated an improved correlation between the mechanistic material constitutive properties of the stabilized aggregate to the end-product field structural assessment relative to conventional California bearing ratio and unconfined compressive strength test results.

Impact of Compaction Delay on the Engineering Properties of Cement Treated Soil.

“…[16] stated that full-depth reclamation and cement stabilization enabled significant volumes of in-place granular materials to be reclaimed and strengthened while allowing for the installation of a woven geotextile and sand drainage system over a wetted-up subgrade in a more cost-effective and sustainable construction manner.…”

Modeling the Structural Response of Urban Subsurface Drainage Systems

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drainage passage is one effective way to limit structural and surface performance issues (2,5).Given the modern-day challenges of rehabilitating an aging road infrastructure, a fundamentals-based, reliable analysis methodology that can directly incorporate recycled materials, substructure drainage systems, and diverse field state conditions is needed. A three-dimensional (3-D) nonlinear computational road model was developed to calculate the fundamental mechanistic pavement response.

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“…Substructure drainage systems are important road structure components because they can mitigate poor subgrade, high water tables, and climatic conditions (e.g., moisture from precipitation, spring thaw, and freeze-thaw cycles). The benefit of incorporating a drainage system in road design has been demonstrated in many case studies in Saskatchewan, Canada, and elsewhere (1)(2)(3)(4)(5)(6). Diverting in situ moisture by providing a layers and are highly dependent on subgrade type.…”