Halla Cement Certifies Concrete Technology That Withstands Heat Waves and Heavy Rain

[Financial News] Halla Cement said its jointly developed hot-weather concrete manufacturing technology with Asia Cement, Halla Ncom and AJU Industrial has received technical certification from The Korean Institute of Building Construction.
According to the industry on the 25th, the technology was developed to prevent concrete from rapidly losing fluidity during summer heat waves and from deteriorating in quality due to sudden rain. The certified method can secure stable constructability and quality in high-temperature and rainy conditions while continuing to use existing ready-mix concrete production and construction equipment.
It applies a rheology-controlled hybrid system using a PCE high-performance air-entraining water-reducing agent and a glycol-based admixture. Based on this, the companies can selectively use long-retention concrete, which maintains fluidity for an extended period in high temperatures, and rain-resistant concrete, which helps prevent quality deterioration when rain enters the mix, depending on site conditions.
In particular, the technology can maintain stable workability even during transport and waiting times of up to four hours. Because it does not require equipment modifications, it can be applied to a wide range of construction sites, including building, civil engineering and bridge projects.
The joint development team verified the technology's performance under conditions similar to an actual construction site. Through a batch plant evaluation at Halla Ncom's Hwaseong plant and a field simulation test at Halla Cement Concrete Technology Center, the team confirmed that the target workability and compressive strength were maintained even after up to five hours. Under simulated rainfall of 3 mm per hour, the technology also demonstrated compressive strength and durability equal to or better than those of ordinary concrete.
An official at Halla Cement Concrete Technology Center said, "We will continue developing high-performance concrete technologies that can help respond to climate change and improve quality at construction sites."

[email protected] Kim Hyun-chul Reporter