Engineered Product Solutions for Enlargement

Tstrata Enlargement Systems™ bond additional reinforced concrete to existing structures. STRUCTURAL TECHNOLOGIES has optimized design approaches and products to maximize system performance.

Engineered Product Solutions for Enlargement

Tstrata Enlargement Systems™ bond additional reinforced concrete to existing structures. STRUCTURAL TECHNOLOGIES has optimized design approaches and products to maximize system performance.

Engineered Product Solutions for Enlargement

Tstrata Enlargement Systems™ bond additional reinforced concrete to existing structures. STRUCTURAL TECHNOLOGIES has optimized design approaches and products to maximize system performance.

Tstrata Enlargement Systems™

STRUCTURAL TECHNOLOGIES' Tstrata Enlargement Systems bond additional reinforced concrete to existing structures. Our systems are used to increase or restore load-carrying capacity to a variety of structures. Customized for every application, enlargement and overlay systems are ideal for situations that require improved strength and stiffness.

Tstrata Enlargement designs include both mild steel or post-tensioned steel to reinforce member enlargements. STRUCTURAL TECHNOLOGIES' designs ensure that structural enlargements act monolithically (fully bonded) with the existing structure.

A number of traditional and advanced design approaches, technologies and techniques have been developed by STRUCTURAL TECHNOLOGIES to optimize the performance and the transfer of forces between an existing section and new concrete enlargement.

Force Protection Applications

Section enlargement and bonded overlays can be utilized to improve blast and progressive collapse resistance of a structure by:

  • Increasing flexural and shear capacity of columns, beams, and slabs
  • Increasing axial capacity of columns
  • Increasing stiffness or deflection reduction at service levels (slabs or columns)
  • Increasing strength/mass that improves a structural member’s ability to resist failure caused by blast
  • Increasing resistance to slab uplift
  • Preventing progressive collapse caused by column failure and/or slab uplift
Other Advantages:
  • Easy integration with existing structure
  • Uniform appearance and repair schemes that blend well with the existing structure
  • High benefit-to-cost ratio (durable and cost effective strengthening solution)
  • Inherent fire-resistance capability
  • Can be used with other force protection solutions, such as DUCON®, V-Wrap™ FRP, and Tstrata Steel Plate
Design elements include:
  • Methods to steel dowel and profile existing members in preparation for enlargement
  • Custom concrete material specification and placement techniques
  • Extensive steel reinforcement
  • Pressurized form technology that forces new concrete into the pores of the existing concrete surfaces, enhancing the bond between the two materials. Form pressurization also consolidates the repair material and provides full encapsulation of exposed and new reinforcement.
Specialized Engineering Support Services

Assessment of Blast LoadsSTRUCTURAL TECHNOLOGIES in-house team of force protection experts and application engineers work hand-in-hand with owners, engineers of record, blast consultants and general contractors to develop the best solutions from a wide range of products. By partnering with design professionals we assist in solution development by providing:

    • Determination of blast loads and pressures
    • Analysis of blast capacity and performance determinants
    • Blast mitigation conceptualization and option development
    • Detailed high-fidelity analysis and design of mitigation options
    • Structural design of blast mitigation solutions

    Assessment of Structural Capacity for Blast


    Each product in STRUCTURAL TECHNOLOGIES force protection line can be custom engineered by our application engineering group to adjust to your specific project needs. Often multiple product solutions are combined and modified to optimize both performance and value.

    Collaboration with our in-house contracting services that understand constructability, schedule and construction costs ensure all elements of the project are taken into account in developing the highest value solution.

    Force Protection Engineering Team Leader
    Tarek Alkhrdaji, PhD, P.E.

    Tarek Alkhrdaji, PhD, PE

    Tarek Alkhrdaji, PhD, PE, is Vice President of Engineering with Structural Technologies, Hanover MD. He received his Masters and Ph.D. degrees at the Missouri University of Science and Technology. Dr. Alkhrdaji has experience in structural repair and strengthening and full scale load testing of concrete structures. He has been involved in more than 400 projects involving structural repair and strengthening and was involved in numerous repair and strengthening projects that received awards from The American Concrete Institute (ACI), the Post-Tensioning Institute (PTI), and the International Concrete Repair Institute (ICRI). Dr. Alkhrdaji also has experience in design, planning and execution of full-scale load testing of structures for strength evaluation and performance verifications. such as ACI, ASCE, AWWA, SEA, PTI, and ICRI. Dr. Alkhrdaji is currently an active member of He is also an active member of ACI Committee 437 (Strength Evaluation of Existing Concrete Structures), ACI Committee 562 (Concrete Repair Code), a member of ASCE (American Society of Civil Engineers), ICRI (International Concrete Repair Institute) and AWWA (American Water Works Association).

    Dr. Alkhrdaji has written more than 40 papers and articles on structural strengthening of structures including buildings, bridges, silos, tanks and concrete pipes. He has made many technical presentations at major industry events, professional organizations seminars and conferences and was the past Chair of ACI Subcommittee 440F (FRP Repair & Strengthening).



    STRUCTURAL TECHNOLOGIES' licensed engineering services are provided by Structural Technologies StrongPoint, LLC - A Structural Group Company, or through other licensed engineers.

    Installation Support

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    STRUCTURAL TECHNOLOGIES provides construction phase support services to ensure that the force protection systems are installed properly and will carry out their intended functions. We coordinate with builders to provide project-specific oversight, quality assurance and quality control.

    Turnkey Investigate – Design – Build Solutions

    When paired with Structural Group's specialty contracting companies—we provide our clients with a full range of force protection design support, construction, and maintenance services from a single source of accountability. Together, we seamlessly deliver customized, cost-effective, and long-lasting solutions for structural challenges.





    STRUCTURAL TECHNOLOGIES — A Structural Group Company

    With member companies dating back to 1902, Structural Group is firmly committed to its ongoing mission of making new and existing structures stronger and last longer. Through its member companies, Structural Group delivers turnkey solutions that integrate technology, engineering, and construction. Structural Group provides state-of-the-art products and engineering support services through STRUCTURAL TECHNOLOGIES and specialty contracting services through STRUCTURAL and PULLMAN

    Learn more about Structural Group and its member companies.