heavy concrete

noun

: concrete in which the usually rock aggregates are partially or wholly replaced by aggregates of metal (as steel) and which is used especially for counterweights or in shielding nuclear reactors

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“Heavy concrete.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heavy%20concrete. Accessed 3 Dec. 2022.

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