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Sakai Lab
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A lab that creates low-carbon construction materials from concrete rubble and discarded food.
AboutAbout the lab
Next-generation construction materials from rubble and vegetables.
Sakai Lab studies construction materials, with a focus on concrete.
The lab develops low-carbon, next-generation materials, including recycled concrete, plant-based concrete, and materials made from discarded food.
It also works on inspection and evaluation methods to make concrete structures last longer and to maintain and manage them rationally.
Students entering from other universities are also welcome.
Key terms
- Cement
- A powder made by firing limestone and other materials. It hardens by reacting with water and acts as an adhesive that binds sand and gravel.
- Hot pressing
- A processing method that applies heat and pressure to a material at the same time to compact it.
- Lignin
- A component found in plants such as wood. It binds cells together and supports the body of the plant.
NewsLab news
Published papers, including one on giving insecticidal properties to materials made from food waste
Published papers, including one on making construction materials from low-quality sand without cement
Announced the Komaba Research Campus Open House (June 5 and 6)
A student received the Tanabe Prize (Outstanding Undergraduate Thesis Award)
ResearchResearch themes
The lab studies construction materials, mainly concrete, with the aims of achieving ideal recycling, extending the service life of structures, establishing rational maintenance and management methods, and developing low-carbon, next-generation concrete. It aims to contribute to a sustainable society.
*Illustrative imageComplete Recycling of Concrete
The lab is developing a method to remake concrete from concrete rubble without producing by-products and without adding new resources or cement. It is also researching the recycling of other construction materials, such as gypsum board.
*Illustrative imageConcrete Requiring No Binder
The lab is developing a method that uses a catalytic reaction to break and re-form the chemical bonds of sand and gravel, bonding them directly without cement. It has confirmed that the method can bond even desert sand and lunar soil simulant.
*Illustrative imageMaterials from Discarded Vegetables and Fruits
The lab hot-presses parts that are thrown away uneaten, such as vegetable outer skins and fruit peels, to develop a material made entirely of plants and strong enough to be used even as a construction material.
*Illustrative imagePlant-Based Concrete from Rubble and Wood
This method crushes and mixes concrete rubble and wood, then hot-presses the mixture to turn it into a new civil engineering and building material. Lignin contained in the wood acts as an adhesive, and biodegradability is also expected.
MembersFaculty
The members of Sakai Lab consist of faculty members, project researchers, collaborating researchers, doctoral and master's students, and research trainees.As of 2026
- Associate ProfessorYuya SakaiPublications ↗
- Project Assistant ProfessorZheng Fang
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “20mm-aggregate” Billbeee at English Wikipedia / CC BY 3.0 (cropped)
- Complete Recycling of Concrete: “Gravats bricaillon recyclé en fonds de couche routière Lille2” Lamiot / CC BY-SA 4.0 (cropped)
- Concrete Requiring No Binder: “Namib-Naukluft Sand Dunes (2011)” Yathin S Krishnappa / CC BY-SA 3.0 (cropped)
- Materials from Discarded Vegetables and Fruits: “Abandoned Cauliflower in Poznan” MOs810 / CC BY-SA 4.0 (cropped)
- Plant-Based Concrete from Rubble and Wood: “Pile of wood chips Namibia” Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) - Bush Control and Biomass Utilisation Project / CC BY-SA 4.0 (cropped)
- Related lab (Concrete Lab): “Dogawa Dam” 河川一等兵 / CC BY-SA 4.0 (cropped)
- Related lab (Kishi Lab): “Detail of vertical crack in concrete retaining wall at Medway Park Sports Centre, Gillingham, Kent, England” Sunolafjagtenben-hur / CC0 (cropped)
- Related lab (Mizutani Lab): “Ouster OS1-64 lidar point cloud of intersection of Folsom and Dore St, San Francisco” Daniel L. Lu / CC BY 4.0 (cropped)
- Related lab (Construction Management / Development Systems Lab): “Tsurumi-tsubasa-bridge” LERK / CC BY 2.5 (cropped)
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