Full Factorial Design for Optimization of Magnesium Alkalinization Additive

Intensive research using chemical stabilization for improving subgrade soil has become increasingly popular around the globe. The alkaline activator additive provides an improved and effective alternative for cement, and also produces comparatively less CO2 emissions. This paper studied the factors that contribute to the strength development of silty sand, a typical subgrade soil in Kamloops, British Columbia (BC), Canada, by mixing different percentages of MgCl2 with alkaline activator (Na2SiO3/NaOH). A total of 64 samples, including the untreated sample, were tested using standard compaction tests and the unconfined compressive strength (UCS) test under curing periods of 7, 14, 28, and 60 days. The Analysis of Variance (ANOVA) full factorial design was used to analyze the UCS results for determining the optimum design of the experiment. A significant compressive strength improvement on the treated soil sample was found using the proposed additive. The combination Na2SiO3/NaOH (0.5) ratio, alkaline activator-to-MgCl2 (0.7) ratio, and 3%, of MgCl2 percentage by dry weight of the soil was selected as the optimum additive design to improve the silty sand found in subgrades in Kamloops, BC.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01723029
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 20 2019 9:42AM