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.
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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.
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Company information
In the mid-1950s, during a period of construction boom leading up to the Tokyo Olympics, Asou Sangyo Co., Ltd. (now Asou Corporation) focused on the increasing demand for lightweight and labor-saving high-rise buildings. They recognized the advantages of using aerated concrete (air mortar), which excels in lightweight properties and thermal insulation, as insulation material, and established the company with the aim of manufacturing and constructing building-grade aerated concrete. The unique technology developed through research and development of imported technology from the United States, along with the excellent characteristics of their product (aerated concrete), matched the needs of the times. It was used for waterproofing on rooftops to reduce the weight of high-rise buildings, raising floor slabs on each floor, and embedding piping in mechanical rooms. Subsequently, the lightweight properties of aerated concrete attracted attention from various fields, leading to its adoption in numerous civil engineering projects, including the Tōkaidō Shinkansen construction. To date, the construction achievements have exceeded 10 million cubic meters, and the company continues to provide satisfaction to the times and society as a pioneer of air mortar and a technology development-oriented enterprise that responds to various needs.