Technology for extending the lifespan of bridges using air mortar (soil engineering).
It is a method for extending the lifespan of bridges using lightweight soil mixed with air bubbles, which has seen increased results in recent years.
While leaving the bridge piers and girders intact, we will fill the voids beneath the bridge with aerated concrete to convert it into an earth structure. This will eliminate the need for regular inspections and repairs of the buried bridge, contributing to its longevity and also resulting in reduced running costs thereafter. Additionally, since the work will be carried out only in the space beneath the bridge, there is no need for external scaffolding for the assembly of formwork panels, allowing construction to proceed without completely closing the road to traffic. In an era where maintaining and managing existing infrastructure to extend its lifespan is essential, our air mortar technology will respond to the needs of the times.
basic information
Aerated concrete (air mortar, air milk) is a material that combines slurry-like mortar with air bubbles, allowing for lightweight embankment construction in areas where conventional soil would be difficult to work with. <Features> 1. It can stand on its own once set, making it suitable for embankment in steep slopes and confined spaces. 2. Being lightweight, it reduces the load and soil pressure on the ground and structures during embankment and backfilling. 3. It has excellent fluidity and does not require compaction, making it suitable for backfilling in narrow spaces and filling various voids. 4. By adjusting the amount of cement and air, it is possible to design a suitable mix with a unit weight ranging from 5 kN/m³ to 13 kN/m³. 5. Compared to organic polymer materials, it is more resistant to ultraviolet rays, heat, and oil, offering higher durability.
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Applications/Examples of results
Due to the advantages of aerated concrete, the company has exceeded a cumulative construction volume of 6.8 million cubic meters in 2022 for embankment work using the "FCB method" in locations where conventional soil construction is difficult, such as the back of bridge abutments on soft ground and road widening on steep slopes. This accounts for approximately 70% of the domestic construction volume of the FCB method. The method of soil engineering for bridges, leveraging this achievement, was adopted in 2008 on a national highway in mountainous areas and has continued to achieve results to this day.
