Effective waterproofing at structural joints is critical to ensuring durable, high-quality construction that offers long-term performance and lifecycle cost efficiency, emphasises construction chemicals specialist Chryso Southern Africa.

The company says its high-performance hydrophilic waterstop solution ADCOR 500S is engineered to prevent water ingress through concrete construction joints and penetrations, supporting the long-term durability of critical infrastructure.

The solution is a conformable, butyl rubber-based hydrophilic waterstop strip that expands on contact with water. Once fully encapsulated within poured concrete, the controlled expansion creates a seal against adjacent concrete faces, designed to effectively prevent water entry into below-ground and other water-sensitive structures.

The product is particularly well suited to critical applications such as basements, retaining walls, pile caps, floor slabs, lift pits, tunnels, water-retaining structures and pipe penetrations, where waterproof integrity is essential to long-term structural reliability.

Chryso Southern Africa specialty materials head: infrastructure business unit Andries Janse Van Rensburg explains that waterproofing failures at construction joints can have significant implications for structural durability, maintenance costs and operational continuity.

“Water ingress through joints remains one of the most common risks in below-grade and water-retaining concrete structures. ADCOR 500S provides a highly reliable and technically advanced sealing solution that responds directly to the presence of moisture, creating an active barrier where it is needed most,” Janse Van Rensburg says.

The solution features controlled volumetric expansion, designed to reduce the risk of concrete spalling while maintaining cohesive strength after expansion. Unlike conventional bentonite-based systems the product is designed for reproducible swelling performance, even after repeated wet-dry cycles, ensuring long-term sealing integrity in demanding environments.

The product is also engineered to be highly malleable and conformable, allowing for easy application to irregular substrates and complex concrete profiles. This flexibility aims to simplify installation on site and supports a wide range of project conditions.

The waterstop system is designed to withstand hydrostatic pressure of up to 70 m and is said to deliver a minimum volumetric expansion of 100%, making it particularly effective in high water table environments and critical civil engineering applications.