Karbonatyzacja betonu produkowanego z użyciem CO2 jako domieszki

• Autorzy: Kazmi Md Athar , Meesaraganda Lakshmi Vara Prasad

Identyfikatory

DOI

10.32047/CWB.2023.28.6.1

Warianty tytułu

EN

Carbonation behavior of concrete produced using CO2 as an admixture

• Języki publikacji: PL EN

Abstrakty

PL

W istniejącej praktyce CO2 wprowadzany jest do betonu głównie poprzez przyspieszoną karbonatyzację, która ma wiele ograniczeń, takich jak mała szybkość dyfuzji i wymaganie dużej szczelnej komory, co ogranicza ją tylko do elementów prefabrykowanych. Aby pokonać te ograniczenia, niniejsza praca prezentuje nowatorskie wykorzystanie CO2 w produkcji betonu poprzez mineralizację z użyciem CO2. CO2 jest sekwestrowane do zawiesiny materiału cementowego bogatego w wapń w pierwszym etapie tego procesu, a następnie mieszany z pozostałymi materiałami, aby w drugim etapie wytworzyć beton. Dwuetapowy proces mineralizacji w niniejszej pracy upraszcza wprowadzenie CO2 do betonu i pozwala na uzyskanie 99% efektywności wykorzystania stosowanego CO2. CO2 reaguje z materiałami cementowymi bogatymi w wapń, tworząc korzystnie wpływający na hydratację betonu węglan wapnia w nano-skali. Analiza mikrostrukturalna sugeruje, że węglany rozpoczynają hydratację i przyczyniają się do rozwoju silniejszej mikrostruktury. Z tych powodów odporność na karbonatyzację utwardzonego betonu i wytrzymałość na ściskanie są poprawione. Wyniki opisywanych badań doświadczalnych pokazują, że optymalna ilość CO2 wprowadzona do betonu poprawia wytrzymałość na ściskanie o 18,2%, 18,8% i o 17,9% zmniejsza karbonatyzację po 180 dniach testów. Ponadto główny gaz cieplarniany, CO2, może być wykorzystywany, przyczyniając się do zrównoważonej i przyjaznej dla środowiska produkcji betonu i praktyk budowlanych.

EN

In the existing practice, CO2 is mainly added to concrete through accelerated carbonation, which has many limitations, such as a low diffusion rate and the requirement of a large airtight chamber, which applies to pre-cast elements only. To overcome these limitations, this paper presents a novel beneficial use of CO2 in concrete production through the mineralization of CO2. CO2 is sequestered into a slurry of calcium-rich cementitious material in the first step of this process and then blended with the remaining materials to make concrete in the second step. The two-step mineralization process in the present work simplifies the CO2 mineralization into concrete and reaches 99% efficiency of applied CO2. The CO2 reacts with calcium-rich cementitious materials to form nano-scale calcium carbonate beneficially impacted concrete hydration. Microstructural analysis suggests that the carbonates seed the hydration and contribute to developing a stronger microstructure. For these reasons, the carbonation resistance of hardened concrete and the compressive strength is improved. The finding of the experimental investigation of the present research shows that an optimum amount of CO2 mineralization into concrete improves compressive strength by 18.2%, 18.8%, and 17.9% less carbonation at 180 days of testing. Furthermore, the major greenhouse gas, CO2, can be utilized, contributing towards sustainable and environmentally friendly production of concrete and construction practices.

Słowa kluczowe

PL

hydratacja cementu; węglan wapnia; karbonatyzacja; zagospodarowanie dwutlenku węgla; rozwój zrównoważony

EN

cement hydration; calcium carbonate; carbonation; carbon dioxide utilization; sustainability

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2023
• Tom: R. 28, nr 6
• Strony: 364--374
• Opis fizyczny: Bibliogr. 41 poz., il., tab.

Twórcy

autor

Kazmi Md Athar

• Department of Civil Engineering, National Institute of Technology Silchar, India

autor

Meesaraganda Lakshmi Vara Prasad

• Department of Civil Engineering, National Institute of Technology Silchar, India

Bibliografia

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