Slurry Stabilization and Reaction Chemistry of Cement-Treated Soils

This project focused on evaluating important parameters for stabilizing soil with cement slurry and also investigated the chemistry of cement-modified soil at curing times up to 24 hours. Cement slurry usage is increasing due to concerns over dusting, and numerous companies and types of equipment are available to apply the slurry. By investigating the impact of cement slurry age, percent solids, and compaction delay time on the performance of cement-stabilized soils in the lab, researchers discovered that slurry age (up to 2 hours) does not affect performance, and slurry percent solids can impact performance in some cases. However, compaction delay time plays a much more significant role in the strength and modulus characteristics of the end product, and this delay time should be accounted for during the design stage. Investigations of the chemistry of cement-modified soils using scanning electron microscopy, differential scanning calorimetry, and X-ray diffraction suggest that after only 10 minutes of curing both C-S-H and portlandite are present. As curing time increases, the amount of C-S-H decreases and the amount of portlandite increases. After 2 hours cure, coatings are developing on the clay, and after 24 hours these coatings are more extensively developed. Additionally, a shift in the montmorillonite basal spacing and a change in the montmorillonite recrystalization peak suggested the cement produced a structural modification. After 24 hours, a measurable amount of cement clinker existed, meaning unreacted cement is available for further reaction.

Language

  • English

Media Info

  • Media Type: Web
  • Features: Figures; References; Tables;
  • Pagination: 75p

Subject/Index Terms

Filing Info

  • Accession Number: 01142044
  • Record Type: Publication
  • Report/Paper Numbers: PCA R&D Serial No. SN3108
  • Files: TRIS
  • Created Date: Oct 12 2009 4:14PM