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<Overview of the Technology> The Bontelan method is a technology that repurposes bottom sediment accumulated in agricultural ponds or excavation soil from embankments, which are traditionally deemed unsuitable for use as fill, into high-performance ground materials for the renovation and reinforcement of embankments. <Purpose and Objectives of Development> Renovation of agricultural pond embankments requires high-quality soil with excellent strength and impermeability; however, it has become difficult to obtain such soil around these ponds. On the other hand, these ponds often have thick layers of bottom sediment, which contribute to a reduction in water storage capacity and deterioration of water quality, thereby hindering or degrading the functionality of the ponds. Bottom sediment typically contains a high proportion of clay and silt, and due to its generally high water content, it is not easy to dispose of. Therefore, there has been a demand for technology that actively repurposes this sediment into ground materials from environmental and economic perspectives. In response, we developed the Bontelan method by mixing fiber-based soil improvement materials called "Bonfiber" and solidifying agents into the bottom sediment of agricultural ponds, thereby adding functions such as excellent strength characteristics, high seismic resistance, and high durability. There was no earthquake damage to all embankment fill and pond embankment soil constructed using this method prior to the earthquake, and it was selected as one of six technologies recognized for their effectiveness during the Great East Japan Earthquake from a total of 165 submissions at the 2011 Construction Technology Forum.

This document is a collection of case studies on the mud recycling technology called the Bontelan method, which reuses mud that has traditionally been deemed unsuitable for embankments as a high-performance ground material. It introduces numerous construction examples, including the "Haga Pond Area Development Project," which eliminated noise and vibration issues during transportation and achieved significant cost reductions, as well as pond renovation projects and disaster-related works. Along with photos of the construction status, we provide detailed explanations of the construction timing and the amount of modification. We encourage you to read it. [Featured Cases] ■ Haga Pond Area Development Project ■ 2002 Hamao District Embankment Construction ■ 2022 (Carryover) Iizaka District Rural Disaster Prevention and Mitigation Project (Pond Maintenance) Section 2 Construction ■ 2022 Oe Misato District Rural Disaster Prevention and Mitigation Project Section 1 Construction ■ Imokawa Disaster-Related Emergency Construction (Minamihei District, Reikozawa District, Seiganji District) *For more details, please refer to the PDF document or feel free to contact us.

This document introduces the construction achievements of the mud recycling technology, the Bontelan method. The 'mud' generated from construction sites is mixed with fiber-based soil improvement material Bonfiber and solidifying agents to be recycled as high-performance ground materials. [Contents] ■ No. 13 Agricultural and Water Department of the Nishi Prefectural Bureau, Tanazawa Pond No. 1 Construction ■ FY 2022 Osawa District Rural Disaster Prevention and Mitigation Project, Section 1 Construction ■ FY 2022 (Carryover) Iizaka District Rural Disaster Prevention and Mitigation Project (Pond Improvement), Section 2 Construction ■ FY 2022 Oe Misato District Rural Disaster Prevention and Mitigation Project, Section 1 Construction ■ No. 3 Agricultural and Water Department of the Naka Prefectural Bureau, Kosugizawa Pond No. 1, Construction No. 2 *For more details, please refer to the PDF document or feel free to contact us.