Self-Healing Concrete using Encapsulated Bacterial Spores in a Simulated Hot Subtropical Climate

Concrete is one of the most commonly used construction materials in the world, due to its relatively low cost and high compressive strength. However, its weakness in tension makes it susceptible to cracking and thereby exposes any steel reinforcement to harmful agents that cause corrosion. Several techniques are currently used for crack-sealing, but with the current funding limitations, it is especially harder to afford the costly and labor-intensive maintenance and repair services needed to extend a structure’s service life. A potential solution is a bacterial concrete, which has become one of the most promising self-healing alternatives due to its capability to seal crack widths up to 1 mm by reacting directly with the cementitious matrix to form calcium carbonate. It is developed by adding alkali-resistant bacterial spores, which do not impose hazards to human health, in the concrete mixing process. Furthermore, microbial induced calcium carbonate precipitation is directly compatible with Portland cement materials and promotes economic and environmental benefits by increasing durability and water-tightness in concrete. In this study, the authors aim to develop an encapsulation procedure that will allow for testing two bacterial strains at varying dosages (by weight of cement) in concrete. The effects of encapsulated bacteria will be evaluated with respect to the crack-sealing efficiency observed, the effects on the intrinsic mechanical properties, as well as the self-healing processes over time after inducing damage. The concrete specimens will be cured in wet-dry cycles to determine their feasibility in region 6.

    Language

    • English

    Project

    • Status: Active
    • Funding: $128930
    • Contract Numbers:

      18CLSU02

    • Sponsor Organizations:

      Office of the Assistant Secretary for Research and Technology

      Intelligent Transportation Systems Joint Program Office
      Department of Transportation
      Washington, DC  United States  20590

      Office of the Assistant Secretary for Research and Technology

      University Transportation Centers Program
      Department of Transportation
      Washington, DC  United States  20590
    • Managing Organizations:

      Office of the Assistant Secretary for Research and Technology

      Intelligent Transportation Systems Joint Program Office
      Department of Transportation
      Washington, DC  United States  20590

      Transportation Consortium of South-Central States

      Louisiana State University
      Baton Rouge, LA  United States  70803

      Louisiana State University and A&M College

      202 Himes Hall
      Baton Rouge, LA  United States  70803
    • Project Managers:

      Hassan, Marwa

    • Performing Organizations:

      Louisiana State University and A&M College

      202 Himes Hall
      Baton Rouge, LA  United States  70803

      Louisiana Transportation Research Center

      4101 Gourrier Avenue
      Baton Rouge, LA  United States  70808
    • Principal Investigators:

      Milla, Jose

      Hassan, Marwa

      Rupnow, Tyson

    • Start Date: 20180315
    • Expected Completion Date: 20190915
    • Actual Completion Date: 0
    • USDOT Program: University Transportation Centers

    Subject/Index Terms

    Filing Info

    • Accession Number: 01664116
    • Record Type: Research project
    • Source Agency: Transportation Consortium of South-Central States
    • Contract Numbers: 18CLSU02
    • Files: UTC, RiP
    • Created Date: Dec 12 2017 9:59AM