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Phase-II: Addressing Durability Concerns in Binders with Interlayer Reinforcement for 3D Printed Elements

3D Concrete Printing (3DCP) is one of the fastest emerging technologies and involves layer by layer building of a binder material with additives without the use of formworks while enabling the design freedom to produce complex structural geometries. To enable this technology to reach end use applications in construction such as printing large scale fail-safe concrete structural elements, the low tensile strength of concrete is to be overcome. With changing weather and seasonal alterations, the potential of durability issues rising and negatively impacting infrastructure is increasing. These structures are constantly subjected to environmental deterioration mechanisms affecting their durability and life. Moreover, lack of knowledge and data about durability of 3D printed reinforced concrete structures hinders the growth of this digital fabrication method to truly offer its advantages towards transportation. Phase-I of this project titled “Durability Assessment of Binders with Interlayer Reinforcement for 3D Printed Elements” is under investigation to understand the effect of deterioration mechanisms such as chloride ingress and freeze and thaw on the mechanical performance, and flexural strength capacities of (a) cementitious binders with successive layers representing 3D printed elements, and (b) cementitious binders with different types of reinforcement incorporated at the interface between successive layers. Phase-II proposes solutions to address the durability concerns assessed from preliminary investigations in Phase-I which are: (1) steel deterioration is higher when compared to deterioration in fiber reinforcement due to aggressive environments; (2) the reinforcement at the interface needs a protective barrier to prevent ingress; (3) a small portion of reinforcement extends out of the interface and is therefore exposed which needs additional protection. The objectives of Phase-II are to investigate two solutions that can potentially address the durability concerns of cementitious binders with different types of reinforcements incorporated at the interface between successive layers: (i) Investigate the suitability of polymer surface finishings for 3DCP with interlayer reinforcement, and (ii) Investigate the effect of a printed protective barrier using the same 3DCP mix around the reinforced 3DCP with sufficient design modification to create a strategic interface mismatch. Eight tasks have been curated to realize these objectives. Task 1: Coordinate with ACI 548 vicechair Dr. Moneeb Genedy (Stakeholder) to identify which polymer resin and constituents may be ideal for a protective system against 3DCP to investigate objective (i). Task 2: Design outer layer external to 3DCP element using SolidWorks that enables interface mismatch and bonds with the fiber reinforcement to investigate objective (ii). Task 3: Acquire materials from Transpo and Euclid Chemicals who have actively donated materials for the PI’s ongoing work to investigate objective (i). Task 4: Develop a mix design for polymer surface protection for either spray-on or application technique to investigate objective (i). Task 5: Print 3DCP specimens with three types of interlayer reinforcement – steel, Glass Fiber (GF) and Carbon Fiber (CF). Task 6: Subject beam specimens (along with protective measures) to two types of deterioration mechanisms- freeze-thaw and chemical ingress exposure. Task 7: Perform flexure test on beam specimens. Task 8: Conduct post testing analysis and understand reinforcement behavior.

Language

  • English

Project

  • Status: Active
  • Funding: $71,800.00
  • Contract Numbers:

    CY2-OU-10

    69A3552348306

  • Sponsor Organizations:

    Office of the Assistant Secretary for Research and Technology

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

    Southern Plains Transportation Center

    University of Oklahoma
    202 W Boyd St, Room 213A
    Norman, OK  United States  73019
  • Project Managers:

    Dunn, Denise

  • Performing Organizations:

    University of Oklahoma, Norman

    School of Civil Engineering and Environmental Science
    202 West Boyd Street, Room 334
    Norman, OK  United States  73019
  • Principal Investigators:

    Vemuganti, Shreya

  • Start Date: 20241001
  • Expected Completion Date: 20250930
  • Actual Completion Date: 0
  • USDOT Program: University Transportation Centers

Subject/Index Terms

Filing Info

  • Accession Number: 01941680
  • Record Type: Research project
  • Source Agency: Southern Plains Transportation Center
  • Contract Numbers: CY2-OU-10, 69A3552348306
  • Files: UTC, RIP
  • Created Date: Jan 1 2025 4:01PM