Effects of Combined Carbonate and Biofilm on Shrinkage Cracking in Unsaturated Cementitiously stabilized Soils Using Microcapsules.

The proposed study is on an innovative approach that couples self-healing effects of bacterial spores with sequential hydration methodology that could mitigate the development of shrinkage cracking of stabilized mixture while sustaining the development of high strength. A dual encapsulation technique, which involves a primary and secondary encapsulation of two different bacteria into a single microcapsule will be utilized. The sequential hydration which is a concept for which moisture content below optimum is provided for partial hydration and consequently minimized shrinkage cracking will be utilized. The use of dual encapsulation technique, which will allow for a carbonate and a biofilm precipitating bacteria to be encapsulated into a single capsule. The combine precipitate from these bacteria will yield a ductile composite precipitate. The coupled effects of ductile precipitate and sequential hydration will thus provide an optimum stiffness for the stabilized mixture and thus mitigate shrinkage cracking. The mixes containing bacterial microcapsules which enhance self-healing is expected to benefit immensely from the sequential hydration and lead to a novel design for cementitious stabilization.

• Record URL:
  https://tridurle.wsu.edu/effects-of-combined-carbonate/

Language

• English

Project

• Status: Active
• Funding: $90,000
• Contract Numbers:

  69A3551947137

• Sponsor Organizations:

  Transportation Infrastructure Durability & Life Extension

  Washington State University
  Civil & Environmental Engineering
  Pullman, Washington  United States  99164

  Washington State University, Pullman

  Civil & Environmental Engineering Department
  PO Box 642910
  Pullman, WA  United States  99164-2910
• Managing Organizations:

  Transportation Infrastructure Durability & Life Extension

  Washington State University
  Civil & Environmental Engineering
  Pullman, Washington  United States  99164
• Project Managers:

  Kline, Robin

• Performing Organizations:

  Washington State University, Pullman

  Civil & Environmental Engineering Department
  PO Box 642910
  Pullman, WA  United States  99164-2910
• Principal Investigators:

  Shi, Xianming

• Start Date: 20210601
• Expected Completion Date: 20230531
• Actual Completion Date: 0
• USDOT Program: University Transportation Centers
• Subprogram: Transportation Infrastructure Durability and Life Extension

Subject/Index Terms

• TRT Terms: Bacteria; Carbonates; Cement treated soils; Concrete aggregates; Cracking; Encapsulation; Films (Coatings); Moisture content; Shrinkage; Stabilized materials
• Subject Areas: Geotechnology; Highways; Materials; Pavements;

Filing Info

• Accession Number: 01773723
• Record Type: Research project
• Source Agency: National Center for Transportation Infrastructure Durability and Life-Extension
• Contract Numbers: 69A3551947137
• Files: UTC, RIP
• Created Date: Jun 5 2021 5:33PM