Proceedings of the Deep Mixing 2015 Conference, (DFI)
Continuing Challenges Facing Quality Assurance and Quality Control for DSM Product
P. A. Bray, Raito, Inc., United States; A. D. Miller, P. E., Raito, Inc., United States
Soil improvement professionals know that 90% of the time a final product of DSM technology is never seen which provides challenges when verifying what has been installed is to the specifications of the contract. Typically questions arise regarding the effectiveness of the soil improvement; continuity; and keying into specified competent material. For the DSM contractor to provide evidence of meeting specifications quality has to be built into the process from the start. Quality is continuous, iterative and progressive throughout a project, and for a DSM project it is addressed at four stages. At pre-production, bench scale tests are carried out on different mix designs and one or more are chosen for the field test section. At the field test section each of the mix design components are entered into a computerized QA/QC System and several DSM elements will be installed using the different mix designs. During the installation of these trial elements real-time monitoring of the drilling variables is performed using the computerized system. Finally, appropriate methods of testing suitable for the type of product installed, taking into account the classification of the soils treated, provides the valuable information to prove the final product does meet or pass specifications.
|article #2100; publication #1013 (DM-2015)|