Doosan Construction Secures Patent for Technology Ensuring Concrete Quality in Rainy Conditions

Published 05 Mar.2026 09:11(KST)

First in the Construction Industry

Photo of performance verification test for rainwater placement concrete. Provided by Doosan Engineering & Construction

Doosan Construction announced on March 5 that it has jointly secured a patented technology with Ajou Industry to ensure concrete quality in rainy environments. This is the first time a construction company has achieved this.

Generally, the strength and durability of concrete are determined by the ratio of water to cement. If external moisture enters during placement, the designed mixing ratio is altered, resulting in a relatively lower cement concentration and potentially causing material separation and decreased strength. This can lead to surface quality degradation, increased cracking, and reduced long-term durability.

Considering these quality risks, the Ministry of Land, Infrastructure and Transport's "Rainy Weather Concrete Placement Guidelines" stipulate that concrete work is permitted only when rainfall is less than or equal to 3 mm per hour, provided that appropriate measures are taken to prevent moisture ingress. If the rainfall exceeds 3 mm per hour, placement must be halted and proper protective measures must be implemented.

Doosan Construction has developed a technology that suppresses external moisture ingress during rainfall, thereby minimizing changes in the water-to-cement ratio and reducing material separation and strength loss. As a result, quality stability has been secured even under rainfall conditions that exceed the government guideline standards.

Doosan Construction stated, "Quality technology competitiveness is becoming increasingly important in response to recent changes in weather conditions. Through this patent, we have secured reliable construction quality even in rainy environments, and we will continue to strengthen technology development to respond to evolving weather conditions."