Non-Destructive Testing (NDT)

Specialist Non-Destructive Testing Services Across London, the South East and the UK

Assess concrete condition, durability and structural performance without damaging the asset

ACUO SI Ltd provides professional non-destructive testing (NDT) services to help engineers, contractors and asset owners assess the condition, integrity and durability of concrete structures without the need for unnecessary intrusive investigation. Our testing services are used to support structural appraisals, refurbishment planning, defect diagnosis, maintenance strategies and asset management across a wide range of building and infrastructure projects.

Using industry-recognised testing methods, we evaluate concrete quality, uniformity, surface hardness and the likelihood of reinforcement corrosion, helping project teams make informed decisions based on reliable site data. These investigations are particularly valuable where there are concerns relating to deterioration, ageing concrete, variable construction quality, water ingress, durability issues or suspected reinforcement corrosion.

Key Features

• Ultrasonic Pulse Velocity (UPV) testing for concrete quality and uniformity assessment

• Schmidt Hammer testing for surface hardness and comparative strength evaluation

• Half-Cell Potential testing to assess the probability of reinforcement corrosion

• Concrete durability and condition assessments

• Support for refurbishment, remediation and structural investigation projects

• Non-destructive evaluation of existing concrete elements and structural assets

• Clear site data to support engineering appraisal and decision-making

• Detailed engineer-ready reporting with findings and recommendations

What Our NDT Services Provide

Our NDT services are designed to provide meaningful information about the condition and performance of reinforced concrete structures while minimising disruption to the asset. Testing can be used to assess concrete quality, consistency, relative strength, durability concerns and corrosion risk, helping identify areas that may require repair, further investigation or long-term monitoring.

Ultrasonic Pulse Velocity (UPV) testing is used to assess the quality and uniformity of concrete by measuring the speed at which an ultrasonic pulse travels through the material. This can help identify potential internal defects, poor-quality zones, cracking, voiding or variations in concrete condition.

Schmidt Hammer testing is used to assess surface hardness and provide an indication of the relative compressive strength of concrete. It is particularly useful for comparative testing across slabs, walls, columns and other structural elements where variations in surface condition or concrete performance need to be assessed.

Half-Cell Potential testing is used to evaluate the probability of active reinforcement corrosion within reinforced concrete. This is especially important for ageing assets, exposed environments and structures showing signs of distress, staining, cracking or moisture-related deterioration.

Why NDT is Important

Non-destructive testing provides valuable diagnostic information without causing avoidable damage to the structure. It allows engineers and asset owners to better understand the condition of concrete elements, prioritise repairs, plan remediation works and reduce uncertainty before more invasive investigation or repair works are carried out.

For contractors, NDT can help identify potential issues early and support safer planning on refurbishment and alteration projects. For engineers, it provides useful technical data to support condition assessments and structural recommendations. For asset owners, it helps protect long-term value by informing maintenance and repair decisions with evidence-based site information.

Reporting and Site Support

All NDT works carried out by ACUO SI Ltd are supported by clear professional interpretation and detailed engineer-ready reporting. Reports can include testing methodology, survey coverage, results, observations, limitations and practical recommendations to assist with further investigation, repair planning or structural review.

ACUO SI Ltd combines practical site experience with robust testing methods to deliver accurate, reliable and actionable structural diagnostics, helping clients better understand the true condition of their concrete assets.