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Japan’s Obayashi develops CO2 absorbing concrete using woody biomass

22:26 | 05/06/2022

(Construction) - Japanese construction company Obayashi Corporation has developed "Lignin-Crete," a concrete that utilizes woody biomass.

By adding powdery lignin, a kind of organic polymer in wood to concrete, carbon dioxide can be fixed in concrete structures for a long period of time. Because a portion of sand is replaced with lignin, the amount of sand used as a concrete material can be reduced, thereby reducing the environmental burden in terms of natural resource conservation.

japans obayashi develops co2 absorbing concrete using woody biomass
Japan’s Obayashi develops CO2 absorbing concrete using woody biomass

Lignin-Crete was developed jointly with Nippon Paper Industries and concrete chemical admixture maker Flowric. Powdered lignin is added and mixed with concrete to immobilize CO2 for a long period of time, thereby reducing environmental impact. This provides concrete structures with high added value.

Typical concrete emits approximately 270 kg of CO2 per cubic meter during production. Lignin absorbs about 2.4 kg of CO2 per 1 kg. Therefore, adding 100 kg of lignin to one cubic meter of concrete would result in the emission of about 240 kg of CO2 can be stably fixed for a long period of time throughout the life cycle of the structure. The CO2 will remain fixed even when the structure is dismantled and reused as aggregate. (2022/05/19)

The Daily Engineering and Construction News of Japan

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