Plate Bearing Test Services From CTS
Our experienced engineers and technicians deliver reliable on-site testing, whether you need a plate load test for highways, infrastructure, working platforms, soil stabilisation, or foundation verification.
Experienced Site Teams
More than 30 years supporting construction, infrastructure, and geotechnical projects.
Accurate Ground Data
Assessing bearing capacity, settlement behaviour, and subgrade stiffness on-site.
Quality Assurance
Reliable results that support compliance, verification, and technical review.
Wider Materials Testing
Carried out alongside UKAS-accredited lab testing and wider site investigation services.
What Is a Plate Load Test?
A plate load test, also known as a plate bearing test, is an in-situ test used to assess the load-bearing behaviour of soil and other construction materials. The test measures how the ground responds when a controlled load is applied through a rigid steel bearing plate positioned on the surface or within a prepared excavation.
Engineers use plate testing to evaluate bearing capacity, settlement characteristics, and ground stiffness under conditions that closely represent actual construction loading. This makes the plate test particularly valuable during site investigation, earthworks verification, and foundation assessment.
How It Works
At CTS, we carry out all plate load testing in accordance with recognised industry standards, including BS 1377-9:1990 and IAN 73/06, providing accurate data to support design decisions, quality assurance, and compliance with project specifications.
What Does a Plate Bearing Test Measure?
A plate load test provides information about several key aspects of ground performance. These measurements help engineers understand how a material is likely to behave when subjected to construction loads.
- Bearing capacity – the ability of the ground to support applied loads
- Settlement behaviour – how much the material moves under loading
- Ground stiffness – the resistance of the subgrade to deformation
- Modulus of Subgrade Reaction – K-value assessment where required by the design specification
Because plate testing assesses a larger volume of material than many penetration-based tests, it offers valuable insight into overall ground behaviour across the test area.
Outcomes for Decision Makers
Carrying out a plate bearing test before construction progresses helps reduce uncertainty and supports informed decision-making. Reliable site data allows engineers to verify design assumptions and identify potential ground performance issues at an early stage.
- Verify design assumptions using measured site performance data
- Reduce construction risk by identifying unsuitable ground conditions early
- Support compliance with project specifications and quality requirements
- Provide traceable evidence for approvals and technical reviews
- Improve quality control across earthworks, foundations, and ground improvement works
For many projects, plate testing forms part of a broader quality assurance strategy that includes CBR testing, moisture testing, density testing, and laboratory analysis of construction materials.
Plate Load Testing Within a Wider Site Investigation
At CTS, we provide plate load testing as part of a comprehensive suite of site investigation and materials testing services, including in-situ CBR, density and moisture content, air void percentage, shear strength, DCPs, and a wide range of laboratory analyses.
This integrated approach helps clients build a complete understanding of ground conditions and material performance across the project lifecycle, enabling engineers to make more informed technical decisions and maintain confidence in construction outcomes.
Why Work with CTS?
CTS brings more than 30 years of experience in site investigation, geotechnical services, and construction materials testing. Our engineers, technicians, and laboratory teams work to recognised industry standards and support projects across the residential, commercial, infrastructure, highways, rail, and utilities sectors.
We combine practical site expertise with UKAS-accredited laboratory testing to deliver accurate, traceable results that support compliance, quality assurance, and project delivery. Our team is also available to advise on the most appropriate testing strategy for your specific ground conditions and construction requirements.
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Frequently Asked Questions
What is a plate test and why is it needed?
A plate load test is used to assess how soil and other construction materials respond when subjected to an applied load. It helps engineers determine bearing capacity, settlement behaviour, and ground stiffness for foundations, pavements, earthworks, and other infrastructure applications.
Is a plate load test the same as a plate bearing test?
Yes. The terms plate bearing test and plate load test are commonly used to describe the same in-situ testing method. Both involve applying a controlled load through a steel bearing plate and measuring the response of the underlying material.
What is measured during plate load testing?
During plate load testing, engineers measure the settlement of the ground as incremental loads are applied through the bearing plate. The results can be used to assess bearing capacity, settlement characteristics, ground stiffness, and the Modulus of Subgrade Reaction (K-value) where required.
What is the difference between a plate bearing test and a CBR test?
A CBR test measures resistance to penetration using a standard plunger, while a plate bearing test measures how the ground responds to a directly applied load. CBR testing is commonly used for pavement design, whereas a plate test can provide additional information about overall ground stiffness and settlement behaviour.
Can a plate bearing test be used for soil stabilisation projects?
Yes. A plate bearing test can form part of a wider soil stabilisation testing programme to confirm that treated materials achieve the required performance. CTS often combines plate testing with laboratory analysis, density testing, and in-situ CBR testing to provide a comprehensive assessment of stabilised soils.
Can a plate bearing test be used for earthworks testing?
Yes. Plate testing is commonly used as part of earthworks testing to assess the performance of subgrades, engineered fill, and other earthworks materials under applied loads. The results help engineers verify bearing capacity, settlement behaviour, and ground stiffness before subsequent construction activities take place.