Regions all over the world are experiencing rapid economic growth, which subsequently leads to an increase in industrial waste generated from construction sites. Disposing of this waste in an environmentally responsible manner has become a significant challenge. In response, governments have implemented stricter regulations to prevent waste generation and ensure proper disposal. One approach that gained popularity in the 1990s is liquefied soil stabilization. This method involves mixing construction-generated waste with cement or solidifying materials to create backfill for reinforcement and ground stabilization. Although liquefied stabilized soil offers advantages such as ease of application in areas with soil compaction constraints, it also has several drawbacks, including environmental concerns. However, a team of researchers at Shibaura Institute of Technology (SIT) has recently made advancements in this field by altering the solidifiers and thickeners used.
Led by Prof. Shinya Inazumi from SIT’s School of Engineering and Science, the research team focused on addressing the structural and environmental limitations of liquefied stabilized soil. By using a cellulose-based thickener, they were able to inhibit the bleeding phenomenon and maintain fluidity in the soil. Additionally, they replaced the ordinary Portland cement solidifier with a mixture of earth silica-blast furnace slag powder (ES-B). This alternative solidifier is more sustainable as it does not contain chromium, allows for the adjustment of the rate of curing, and enables homogenous mixing and better fluidity when combined with soil.
The team primarily studied the impact of using a cellulose-based thickener on the liquefied stabilized soil. Their research revealed that the addition of the thickener did not affect the strength of the soil. Furthermore, it completely suppressed bleeding and prevented the separation of soil components, unlike soil that did not incorporate a thickener. The cellulose-based thickener did not cause any difference in the reaction products of the stabilized soil or affect its surroundings when immersed in water.
These advancements in liquefied stabilized soil offer numerous advantages. Firstly, it promotes the environmentally friendly disposal of industrial waste, addressing the global issue of waste management. Additionally, it improves the stability of building foundations, especially in earthquake-prone zones. The use of waste material in construction projects enhances circularity, resulting in cost savings and reduced environmental impact. Moreover, the technology reduces the time required for ground improvement on construction sites, thereby improving operational efficiency.
The research conducted by the Shibaura Institute of Technology showcases the potential of cellulose-based thickeners and earth silica-blast furnace slag powder in improving liquefied stabilized soil. The findings have demonstrated that the addition of a cellulose-based thickener successfully inhibits bleeding and maintains fluidity, while the replacement of ordinary Portland cement solidifier with ES-B offers environmental benefits. These advancements not only contribute to the environmentally responsible disposal of industrial waste but also improve the stability of building foundations. The use of waste material in construction projects further promotes circularity and sustainable practices. As this technology continues to evolve, it has the potential to revolutionize the construction industry by providing cost-effective and eco-friendly solutions for ground improvement.
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