Отработанная кофейная гуща делает бетон на треть крепче

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Отработанная кофейная гуща делает бетон на треть крепче

Необычное применение использованной кофейной гуще нашли исследователи из Мельбурнского королевского технологического института (RMIT) — в качестве добавки в бетон, которая делает его почти на треть крепче.

Ежегодно любители кофе оставляют после себя до 60 млн. тонн отходов в виде гущи (SCG). Абсолютное их большинство оказывается на свалках. Исследования показали, что мелкие частицы SCG могут стать усиливающим компонентом бетона. Для этого их тщательно высушивают, а затем нагревают методом пиролиза (без доступа кислорода) до 350-500 °C, после чего кофейная гуща превращается в биоуголь.

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Всего было разработано 12 вариантов смесей, которые добавлялись в портландцемент в объеме 5, 10, 15 и 20 % в качестве заполнителя вместо песка. В процессе тестирования «кофейным» бетоном заполнили формы, удалив из него с помощью вибрации воздушные пробки. Затем его оставляли на сутки при комнатной температуре, измельчали в резервуаре с водой и тестировали на прочность методом сжатия. В результате, образцы бетона, где 15 % песка было заменено смесью SCG, показали увеличение прочности на сжатие почти на 30 %.

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    References:

    Testabol Depot Patient FAQs

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