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Sustainable Concrete Construction, Repairs and Restoration

At Contech, we make sustainability easy. As New Zealand’s leading specialist in concrete construction and remediation, we’re committed to delivering solutions that not only meet your engineering needs but also promote environmental responsibility.

Sustainability isn’t just about using greener materials – it’s about making smarter choices from the start. Whether it’s extending the life of an existing structure, reducing the carbon footprint of a new build, or implementing industry-best environmental practices, we help our clients achieve sustainability without compromising on performance or durability.

Our expertise ensures that your projects meet engineering, economic, and environmental goals in one smart solution.

Need a sustainable way to repair, restore, or build with concrete? Let’s talk about the best solution for your project.

The Most Sustainable Structure Is the One That Already Exists

Investing in the repair, restoration, and extension of a structure’s lifespan is the most sustainable approach.

 

By preserving existing buildings and infrastructure, we minimize the environmental impact associated with new construction. Our expertise in concrete remediation ensures that your structures remain safe, functional, and environmentally friendly for years to come.

 

Contech’s sustainable solutions for strengthening existing structures include:

Seismic Strengthening:

Improve stability and resilience in earthquake-prone areas to extend a structure’s lifespan. Strengthening existing buildings reduces the environmental cost of demolishing and rebuilding after seismic events, preserving valuable resources. Find out more about Seismic Strengthening here.

FRP Strengthening:

Enhance structural performance with fibre-reinforced polymer (FRP) solutions. This lightweight, high-strength material allows for reinforcement without adding significant weight, offering a more sustainable alternative to traditional strengthening methods. Find out more about FRP Strengthening here.

Sprayed Concrete:

Repair and strengthen damaged concrete structures or stabilise excavations without the need for formwork. This quick, efficient, low-waste technique extends the life of existing structures while reducing the carbon footprint associated with traditional concrete replacement. Find out more about Sprayed Concrete here.

Epoxy Injection:

Repair cracks in concrete walls, slabs, columns, beams and piers, restoring them to pre-cracked strength. This targeted repair method prevents further deterioration and eliminates the need for more resource-intensive structural replacements. Find out more about Epoxy Injection here.

Rock and Ground Anchoring:

Provide temporary or permanent reinforcement for structures on unstable or shifting ground. By stabilising existing infrastructure, rock and ground anchoring prevents premature failure, reducing the environmental and economic costs of large-scale repairs or replacements. Find out more about Rock and Ground Anchoring here.

Grouting:

Reinforce an existing building’s foundation and structure, stabilise soil, and repair concrete damage. By strengthening what’s already there, grouting reduces the need for extensive demolition and reconstruction, minimising material waste and environmental impact. Find out more about Grouting here.

Wastewater Infrastructure Protection:

Extend the life of wastewater infrastructure with long-term protection against biogenic corrosion. Whether it’s safeguarding new assets with Sewper Liner or repairing and reinforcing existing ones with SewperCoat, these advanced solutions reduce the need for costly and resource-intensive replacements. Find out more about Sewper Liner here and SewperCoat here.

Cathodic Protection:

The only reliable way to stop corrosion in steel and concrete structures. By preventing deterioration at the source, cathodic protection extends the life of critical infrastructure, reducing waste and the environmental impact of premature replacements. Find out more about Cathodic Protection here.

Pile Jacketing:

High-performance repair for steel, concrete, or timber bridge and wharf piles. By protecting and reinforcing existing piles rather than replacing them, pile jacketing significantly reduces material use and construction waste. Find out more about Pile Jacketing here.

Building New? Build Sustainably with Post-Tensioned Concrete

For new construction, sustainability is about smarter design, material efficiency, and long-term durability.

 

Post-tensioned concrete allows for thinner slabs, longer spans, and stiffer walls, reducing material usage while improving structural performance.

 

This approach cuts down on concrete and steel consumption, leading to lower embodied carbon and a more efficient, cost-effective build. It also enhances structural resilience, reducing maintenance needs over time, and allows for more open, adaptable spaces that can evolve with future demands.

 

By maximising strength while minimising materials, post-tensioning is a smarter way to build for both performance and sustainability.

Post-Tensioned Floor Slabs:

Achieve greater load-bearing strength, durability, and stability in your concrete slab floor while reducing material requirements. Find out more about Post-Tensioned Floor Slabs here.

Suspended Post-Tensioned Slabs:

Ideal for high-rise construction especially multi-unit residential buildings, these slabs offer flexibility of design, thinner slabs, faster construction times, and lower material costs compared to conventional reinforced concrete. Find out more about Suspended Post-Tensioned Slabs here.

Post-Tensioning in Other Locations:

Post-tensioning strengthening solutions can be used for for bridges, buildings, towers, marine structures, tanks, and ground anchors. By optimising structural efficiency, BBR post-tensioning minimises waste and extends the lifespan of new infrastructure. Find out more about Other Post-Tensioning Solutions here.

Recent Sustainability Articles & Projects

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