Research Results on Anstar’s A-BEAM W® Composite Beam
A research project by A-Insinöörit on the moisture management performance of composite beams was conducted between October 2023 and April 2024. The study explored various aspects of the moisture-related performance of A-beams, with a particular focus on the A-BEAM W® model.
The research aimed to create a realistic experimental setup, including side pours along the composite beam’s edges and a 40-mm top layer pour. Measurements utilized both wireless devices and drill hole gauges from various manufacturers. Additionally, test specimens were weighed throughout the experiment to monitor absolute water evaporation.
"The measurement arrangement was highly comprehensive. These methods allowed precise tracking of moisture behavior both within the structure and near its surface. This provides reliable data on the concrete's drying processes," said Max Levander, Chief Technology Officer at A-Insinöörit.
The importance of concrete mix in moisture management
The study revealed that the concrete mix is key to the moisture performance of composite beams. The C40/50 concrete developed for the A-BEAM W® features a low water-cement ratio (0.4), minimizing the amount of water that needs to evaporate.
“The moisture advantage of the composite beam is based on a concrete mix that can be tailored in factory conditions using criteria different from those on-site. The less water the concrete contains, the less moisture remains in the structure, which could cause problems later. This highlights the importance of the concrete’s production environment,” Levander explained.
Controlled manufacturing conditions ensure quality
The A-BEAM W® is cast in factory conditions, where critical early-stage moisture management can be better controlled.
“Factory casting is a significant advantage. Controlled conditions ensure that the concrete cures ideally. Such precision is not always achievable on-site,” Levander continued.
The research also found that the closed web design of the A-BEAM W® directs moisture toward the top surface of the structure, where drying is most efficient. Additionally, the concrete demonstrated relatively rapid moisture binding.
By the midpoint of the testing period, the relative humidity (RH) of the beam's concrete dropped below 90%, a critical milestone for surface treatments. The study concluded that the A-BEAM W® is effective in moisture management when properly handled on-site. Success depends on the choice of concrete mix and manufacturing conditions.
"The drying process of the A-BEAM W® is controlled, with moisture directed out through the structure's top surface under favorable conditions. The research confirms what practical experience has shown: proper concrete quality and understanding of on-site operations are crucial for successful moisture management. By focusing on these aspects, we can achieve durable and safe structures," Levander concluded.
Additional information:
Juha Pulkkanen
Development Director
+358 44 757 4751
juha.pulkkanen@anstar.fi
Max Levander
Chief Technology Officer
A-Insinöörit Suunnittelu Oy
050 501 3875
max.levander@ains.fi
