Structural Testing of Retaining Wall and Raft

When expanding an existing structure, the stability of foundational elements—like retaining walls and rafts—becomes a critical safety consideration. Recently, TCR Engineering was approached by a client seeking a reliable structural testing partner for such a project. The client’s goal: to assess the stability and reliability of an existing retaining wall and raft at one of their sites, prior to integrating these elements into a new structure.

Structural Testing of Existing Retaining Wall and Raft: TCR’s Comprehensive Site Assessment Approach

Client Requirement

The client's intended utilization involved leveraging the existing retaining wall and raft for a new structure. They sought assurance on:

• Structural integrity

• Load-bearing capacity

• Long-term reliability

TCR was tasked with conducting a complete structural audit and field testing program to evaluate these components.

TCR's Proposed Structural Testing Plan

To ensure a thorough understanding of the condition and structural health of the wall and raft, TCR proposed a set of advanced non-destructive and destructive tests carried out by trained professionals on site.

On-Site Testing Activities

1. Ultrasonic Pulse Velocity (UPV) Testing

   • Scope: 300 points

   • Purpose: Evaluate the internal uniformity, cracks, and quality of concrete.

   • Duration: 8-hour shifts with crew.

2. Rebound Hammer Testing

   • Scope: 300 points

   • Purpose: Estimate surface hardness and compressive strength of concrete.

   • Duration: 8-hour shifts with crew.

3. Core Extraction

   • Scope: 100 points

   • Purpose: Physically extract cylindrical concrete samples for lab-based compressive strength testing.

   • Duration: 8-hour shifts with core crew.

4. Visual Inspection & Structural Audit

   • Detailed onsite visual inspection of the retaining wall for visible signs of distress such as cracking, spalling, dampness, etc.

   • A comprehensive audit report will be generated, along with a stability certificate certified by structural experts.

Specialized Equipment to be Deployed

TCR’s field team planned to mobilize the following specialized equipment:

• Ultrasonic Pulse Velocity (UPV) Machine

• Rebound Hammer

• Core Cutting Machine with Core Bits

• Drill Machine, Hammer, Fasteners

• Water Pump for wet coring

• Cover Meter to locate reinforcement prior to coring

TCR's Scope of Work Includes:

• Mobilization of Crew: 3 trained team members, equipped with machines.

• Full-Day Operations: Testing and inspections carried out over 8-hour working days.

• Data Analysis & Reporting: Data collected will be processed to generate reliable and actionable insights on the wall and raft condition.

• Certification: Issuance of a structural stability certificate based on test results and observations.

Conclusion

This structural health assessment illustrates TCR’s capability in offering a technically sound, safety-focused approach to structural reuse. With the right blend of non-destructive testing, core sampling, and expert evaluation, TCR empowers clients to make confident decisions when planning expansions based on existing infrastructure.

Whether you’re dealing with legacy structures or planning future integrations, TCR Engineering ensures every component is fit for purpose—tested, trusted, and certified.