A method for recycling pond bottom sediment and embankment excavation soil into high-performance ground materials.
<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 repair and reinforcement of embankments. <Purpose and Objectives of Development> The repair 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 deposits of bottom sediment, which can lead to reduced water storage capacity and deteriorating water quality, thereby hindering or diminishing 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 material into ground materials from environmental and economic perspectives. In response, we developed the Bontelan method by mixing and stirring fiber-based soil improvement material "Bonfiber" and a solidifying agent into the bottom sediment of agricultural ponds, thereby adding excellent strength characteristics, high seismic resistance, and high durability. There was no earthquake damage to all embankment fill and pond embankment construction carried out using this method before the earthquake. In the 2011 Construction Technology Forum, it was selected as one of six technologies from a total of 165 submissions as a "technology that proved effective during the Great East Japan Earthquake."
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basic information
**Features of the Bontelan Method** - Since the bottom mud of the reservoir is used as raw material, there is no need to purchase quality soil or dispose of mud, which reduces environmental impact and improves economic efficiency. **Features of Bontelan Improved Soil** - No need to collect soil material from near the reservoir, eliminating the need to purchase quality clay soil. - Cost reduction in disposal fees by recycling mud. - Suppresses the occurrence of cracks and has high durability against repeated wetting and drying, as well as freeze-thaw cycles. - High seismic resistance, particularly effective in suppressing liquefaction. - Maintains high durability even with fluctuations in the water level of the reservoir. - Reduces deformation between existing embankments and improves adhesion. **External Evaluation** - Obtained technical review certification from the Advanced Construction Technology Center, No. 2203. - NETIS registration number TH-020042-V (registration period ended). - ARIC NNTD registration number 0245. - Received the "Minister of Land, Infrastructure, Transport and Tourism Award" at the 6th Industry-Academia-Government Collaboration Achievement Awards hosted by the Cabinet Office, Ministry of Internal Affairs and Communications, Ministry of Education, Culture, Sports, Science and Technology, and Ministry of Economy, Trade and Industry in 2008. - Awarded the "Minister of Economy, Trade and Industry Award" at the 6th Monozukuri Japan Awards hosted by the Ministry of Economy, Trade and Industry in 2015. - Selected for the "Twelve Civil Engineering Technologies" hosted by the Japan Society of Civil Engineers in 2022.
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Applications/Examples of results
【Uses】 ● Embankment fill ● Construction fill ● Dike fill ● Ground improvement ● Reinforced earth wall backfill, etc.
Detailed information
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Condition of the bottom sediment
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Addition and stirring of bonfiber.
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Addition and mixing of the curing material (common cement-based or lime-based materials are used).
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Temporary storage of improved soil
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Compaction of improved soil
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Company information
We are developing a business that provides technologies for the recycling and solidification of "mud" generated from construction sites to construction companies nationwide. 【Development Technology 1】Mud Recycling Technology - Bontelan Method This method involves adding our developed fiber-based soil improvement material, Bonfiber, to mud accumulated in agricultural ponds and mixing it to recycle it into high-performance ground materials. 【Development Technology 2】High Water Content Soil Improvement Agent - MT Series This soil improvement agent solidifies high water content mud generated from construction sites in a short time, allowing for immediate transport by dump trucks. We offer technical proposals and product samples free of charge. If you have any issues with "mud," please feel free to contact us.
