Publication Abstract

Proceedings of the Deep Mixing 2015 Conference, (DFI)

Quality Control and Material Properties of Soil Cement on a Cutter Soil Mixing Project in Kitimat British Columbia
Keith MacKay, Golder Construction, Canada; David Siddle, Golder Construction, Canada; G. A. Chapman, Golder Associates, Australia; George Filz, Ph.D., P.E., Virgina Tech, United States

The Cutter Soil Mixing (CSM) method was utilized as part of a deep mixing construction project at a large industrial site in Kitimat British Columbia. The site investigation, design and construction of the CSM soil cement panels presented many technical and logistical challenges which the design-build team had to successfully overcome. The objective of this paper is to present relations developed between the site geology and the material properties of the soil cement samples retrieved during this project and to discuss both the (uncontrollable) site and (controllable) construction parameters which affect these properties. A site investigation was undertaken to characterize the site subsurface conditions and retrieve representative soil and groundwater samples. These samples were used in a bench scale soil mixing test programme. Results of the bench scale test programme were used to set the strategy for the construction of eight field trial panels. Test results on wet grab and core samples collected from the eight field trial panels were then used to set the binder content and construction method for the subsequent 1642 production panels, which formed the main works of the project. An extensive quality control and quality assurance programme was undertaken throughout the construction works. This programme collected (via both coring and wet grab sampling), tested, and provided properties of the CSM soil cement panels. A total of 615 HQ sized core specimens and 3510 cylindrical wet grab specimens were tested for Unconfined Compressive Strength (UCS). As well as the UCS, the elastic modulus, dry density, and water content of each specimen was measured and recorded during UCS testing. Each specimen was classified into a soil category based on its position with relation to geology, specimen appearance, water content, and density, and these data were correlated with measured properties.

 article #2098; publication #1013 (DM-2015)