In this review paper the use of agro waste as a sustainable source for steel reinforcing steel was investigated. Agro waste is said to have certain amount of carbon which can be useful for steel reinforcement, as stated by different authors the carbon derived from agro waste is said to be of high quality. From literature it was observed that there is an increase in demand of agricultural produce which mean automatic increase in agricultural waste and this threat on humans, plants and the environment, this alone shows that agro waste is sustainable as it is currently been underutilized in the steel or iron making industry. In this review different agro waste such as macadamia nut shell, potato peel, husk from cereal, rice husk etc, and it was observed that macadamia nut shell has the highest carbon content which is about 92%. Agro waste is a sustainable source of obtaining carbon and should considered by steel producing companies as the carbon content is high and its environmentally friendly.

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