In the heart of Indonesia, a groundbreaking study is turning heads in the construction and energy sectors, offering a novel solution to a persistent problem: soft soils with low bearing capacity. This issue, which can lead to catastrophic failures like road damage, building tilts, and bridge collapses, has long plagued infrastructure development. But now, researchers from Bandung State Polytechnic have published a study in Jurnal Teknik Sipil, which translates to the Journal of Civil Engineering, that could revolutionize soil stabilization techniques.
The lead author, whose name is not disclosed, focused on a unique combination of locally sourced materials: Bledug Kuwu mud (LBK) and phosphoric acid solution (LAF). Bledug Kuwu mud, rich in silica, alumina, and iron oxide, has a chemical composition similar to fly ash and volcanic ash. Phosphoric acid, though not commonly used in construction, has shown promise as a powerful soil stabilizing agent.
The research, conducted in Gedebage, Bandung, involved collecting native soil samples and subjecting them to a series of physical and mechanical property tests at the Geotechnical Laboratory of Bandung State Polytechnic. The results were striking. The optimum mixture of 15% LBK and 10% LAF reduced the soil’s Plasticity Index (PI) by a remarkable 73.91%, from 46% to 12%. This dramatic reduction in PI indicates a significant improvement in the soil’s engineering properties.
But the real game-changer was the increase in unconfined compressive strength (UCS). The treated soil showed a 35% increase in UCS compared to the native soil, with a UCS value of 1.02 kg/cm² and cohesion of 0.51 kg/cm². This improvement categorizes the soil as “stiff,” a significant upgrade from its previous state.
“The potential of this method is immense,” said the lead author. “It’s not just about stabilizing soil; it’s about creating a foundation for sustainable and resilient infrastructure.”
The implications for the energy sector are particularly exciting. Soft soils often pose challenges for the construction of power plants, pipelines, and other critical infrastructure. This new stabilization method could make these projects more feasible and cost-effective, reducing the risk of failures and extending the lifespan of structures.
Moreover, the use of locally sourced materials like Bledug Kuwu mud makes this method environmentally friendly and economically viable. It reduces the need for expensive imported materials and minimizes the environmental impact of construction projects.
As the world continues to grapple with the challenges of climate change and infrastructure development, innovations like this are more important than ever. The research published in Jurnal Teknik Sipil offers a glimpse into the future of soil stabilization, where sustainability, cost-effectiveness, and resilience go hand in hand.
The lead author’s work is a testament to the power of local innovation and the potential of unconventional materials. As the construction and energy sectors continue to evolve, this study could pave the way for new standards in soil stabilization, shaping the future of infrastructure development in Indonesia and beyond.