Underwater Concrete
Our innovative underwater concrete is specifically designed to allow pouring through water. Due to its high density, it is essential for installations below the waterline and offers the same hardening time as in dry conditions.
Our underwater concrete incorporates advanced anti-washout properties to prevent the washout of fines and cement materials in static and flowing water. This mitigates the risk of washout and minimises disruption during installation. Developed in partnership with Sika®, our underwater concrete is available from all 174 of our static and mobile production plants. The cutting-edge solution has been successfully utilised in prestigious projects such as Leeds Train Station, Canary Wharf, and the Eden Viaduct.
Explore our full range of underwater concrete mixes below. For more information, contact our experts today.
Why Choose Our Underwater Concrete?
Quality-Assured Concrete 
Rigorous testing to ensure performance below the waterline.
Tailored Concrete Products
Select your ideal additives, admixtures, cement and aggregates.
Dedicated Sales Support
Integrated sales management for seamless ordering and delivery.
National Delivery Fleet
1,200 vehicles, 4 locomotives, 140 rail freight wagons.
What Applications Use Underwater Concrete?
The addition of Sika’s UCS pack allows for easier placement of concrete underwater. As such, our underwater concrete solution can be used for the following applications:
- Marine construction
- Bridges - for underwater elements
- Water industry structures
- Any project which requires concrete to be used underwater
What Are The Benefits of Underwater Concrete?
Our underwater concrete offers the following advantages:
- Rapid setting to avoid tidal washout
- Improved cohesion under water
- Superior anti-washout properties
- Conforms to the requirements of BS 8443
Why choose Heidelberg Materials?
Underwater construction requires specialist concrete with a track record of performance and we are a trusted supplier of high-quality, intense-durability underwater concrete solutions for submerged projects across the UK.
Our underwater concrete is specially formulated to resist washout, ensuring excellent cohesion and strength even in flowing or standing water. Ideal for marine structures, bridge foundations, and other submerged builds, it delivers exceptional performance and long-term durability in harsh conditions.
Committed to quality and safety, we adhere to ISO 9001, 14001, and 45001 standards. We also have 2030 sustainability goals and a plan to become net zero by 2050. Backed by a nationwide delivery network and a team of technical experts, we work closely with you to meet your unique project requirements efficiently and reliably.
Case studies
Sea Defences, Dawlish
We supplied a range of complex concrete mixes to deliver vital coastal protection works at Marine Parade, Dawlish, Devon.
River Eden Viaduct, Carlisle
Heidelberg Materials supplied specialist underwater concrete to complete a bridge protection project in Carlisle, Cumbria.
Where Do You Deliver Underwater Concrete?
Our network of 178 static and mobile production plants supports projects across the country.
Our Accreditations
Heidelberg Materials is a member of the Quality Scheme for Ready-mixed Concrete (QSRMC) and all our products carry this certification.
Underwater Concrete FAQs
Find out more about underwater concrete or view our ready-mixed concrete FAQs.
- What Is The Lifespan Of Underwater Concrete?
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Lifespan for underwater concrete depends on factors including mix type, installation quality and environmental conditions, though it can last between 50 and 100 years if designed and placed effectively and properly maintained.
- Does Concrete Get Stronger In Water?
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Concrete can strengthen further when hydrated effectively. This means that underwater concrete can, in certain conditions, be stronger than concrete used on land.
- How Is Underwater Concrete Placed Without Losing Quality Or Experiencing Washout?
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Our underwater concrete is formulated to be cohesive and flowable, ensuring it can be pumped or tremie-placed without segregation, even in flowing or turbulent water conditions.
- Does Underwater Concrete Remain Durable In Marine or Corrosive Environments?
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Yes, our underwater concrete is engineered to withstand harsh environments, including saltwater and chemical exposure, providing long-lasting durability and structural integrity.
- Can Underwater Concrete Be Mixed Bespoke To My Specific Project Requirements?
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Yes, we can tailor our underwater concrete to meet your specific needs, including mix designs for particular water depths, load-bearing requirements, and environmental conditions. Just get in touch with our technical experts to find the best solution for your project.
