Variability Of The Strength Of Soil-Cement Mixtures-PPT Presentation

PPT Presentation

Pdf Summary

The presentation describes Keller North America’s use of Trench Cutting Remixing Deep Wall (TRD) technology at Robinson Landing, a waterfront development in Alexandria, Virginia. The project required a groundwater cutoff wall extending to approximately 80 feet below ground and excavation support for cuts up to 26 feet deep, adjacent to existing structures, roads, and the Potomac River.<br /><br />TRD was selected to provide a continuous, vertically mixed wall serving as both the groundwater barrier and the earth retention system. The method can produce homogeneous walls at depths of up to 150 feet. The project used a cement, slag, water, and bentonite grout mix, with automated batching and pumping.<br /><br />Quality control included real-time monitoring of grout flow, specific gravity, temperature, and wall verticality, along with data acquisition and surveying. Grout and soil-mix samples were tested for viscosity, unconfined compressive strength (UCS), and hydraulic conductivity. Additional checks included in-situ permeability testing, wet-core and conventional coring, and laboratory testing of recovered samples.<br /><br />The presentation also follows construction through excavation, installation of walers and internal bracing, and archaeological work, which uncovered a 17th-century merchant ship. Minor leakage occurred at some exterior corners and was repaired with polyurethane grout.<br /><br />The project was delivered for owner EYA, with Donohoe Construction as general contractor, GEI Consultants as geotechnical engineer of record, and Keller as the specialty subcontractor.

Keywords

TRD technology

Trench Cutting Remixing Deep Wall

Robinson Landing

Alexandria Virginia

groundwater cutoff wall

earth retention system

geotechnical engineering

quality control monitoring

polyurethane grout repair

Potomac River waterfront