LIGHTWEIGHT CORE-SHELL AGGREGATE AND CONCRETE
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United States of America Patent
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Issued Date -
Sep 19, 2024
app pub date -
Mar 13, 2024
filing date -
Mar 14, 2023
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Abstract
High-strength, lightweight core-shell aggregates are formed from waste materials. The aggregates include porous core materials which may be one or more of perlite, vermiculite, cenospheres, expanded polystyrene, or biochar. Formed on the core materials is at least one layer of shell material which includes one or more of GGBS, fly ash, recycled concrete powder, recycled glass powder, or biochar powder. The high-strength, lightweight core- shell aggregates have a loose bulk density less than approximately 980 kg/m3, a crushing strength higher than approximately 4 MPa, a water absorption of less than 20%, and a carbon emission of approximately 181 kgCO2eq/t or less. Lightweight concrete is formed by incorporating the high-strength, lightweight core-shell aggregates with cement to create concrete with a density of 1900 kg/m3 or less.
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