Aju Industries Obtains Patent for Special Rain-Casting Concrete Composition

Casting Without Quality Deterioration Even Under 6 mm Per Hour Rainfall

Aju Industries announced on March 5 that it has obtained a patent for a cast-in-place concrete composition developed through joint research with Doosan Engineering & Construction.

The patented technology is for a "rain-casting concrete composition containing an admixture that maintains strength and reduces drying shrinkage during rainfall."

Recently, the Ministry of Land, Infrastructure and Transport strengthened relevant regulations, prohibiting concrete work entirely during rainfall exceeding 3 mm per hour due to concerns over quality deterioration from rainwater mixing. For rainfall of 3 mm per hour or less, construction is only allowed with the approval of a responsible engineer.

However, in actual construction sites, casting is frequently restricted due to inaccuracies in weather forecasts and conservative judgments by responsible engineers, leading to process disruptions and management difficulties. As a result, repeated advance orders and last-minute cancellations of ready-mixed concrete—made in anticipation of possible rain cancellations—have continued to cause confusion and diminished trust between construction companies and ready-mixed concrete suppliers.

In response, Aju Industries pursued the development of concrete that can be cast without quality deterioration even under rainfall conditions of up to 6 mm per hour, through joint research with Doosan Engineering & Construction.

This technology features a special chemical admixture that increases the segregation resistance of the concrete's constituent materials, thereby preventing rainwater mixing. It also ensures optimal fluidity, enabling stable quality and excellent workability during casting. Performance evaluation by an accredited testing agency, along with real-scale slab mockup tests on actual building components, verified the technology's field applicability. It was confirmed that stable concrete strength can be achieved even under rainfall conditions of up to 6 mm per hour.

A representative from Aju Industries stated, "This patent is significant in that it realizes a next-generation composition that reflects on-site requirements through close collaboration between construction companies and ready-mixed concrete suppliers. Based on this proven technology, we hope to enhance both companies' technical capabilities and contribute to the advancement of the domestic construction industry."

This content was produced with the assistance of AI translation services.