Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Accelerated curing of cement mortar: In-situ carbonation utilising CO2-impregnated faujasite
Graphical abstract Display Omitted
Highlights CO2-impregnated faujasite is used in in-situ carbonation of cement mortar. Effect of addition of faujasite and CO2 on cement mortar properties is investigated. In-situ carbonation is effective in enhancing early strength of cement mortar. In-situ carbonation and faujasite show synergistic effect on reducing setting time. In-situ carbonation via CO2-impregnated faujasite facilitates cement hydration.
Abstract This study explores the use of in-situ carbonation using CO2-impregnated faujasite (FAU) for accelerating the curing of cement mortar. Results indicate that adding 3–12 wt% CO2-impregnated FAU reduces the setting time of the mortars by 2–11% and significantly enhances the compressive strength of the mortars at 1, 7, and 28 days, compared to plain FAU. Microstructural analyses reveal that the in-situ carbonation promotes the hydration of cement by providing additional calcium carbonate nucleation sites for the C-S-H precipitation. This increases the formation of hydration products, which leads to the refinement of the pore structure. Additionally, the in-situ carbonation results in the formation of calcium carbonate crystals with a particle size of 150–200 nm at 28 days, with the calcium carbonate content increased by 1.9 wt% at an addition level of 12 wt% CO2-impregnated FAU. Overall, the in-situ carbonation technique shows great promise as an alternative method for accelerating the curing of cement-based materials, particularly for cast-in-place concrete.
Accelerated curing of cement mortar: In-situ carbonation utilising CO2-impregnated faujasite
Graphical abstract Display Omitted
Highlights CO2-impregnated faujasite is used in in-situ carbonation of cement mortar. Effect of addition of faujasite and CO2 on cement mortar properties is investigated. In-situ carbonation is effective in enhancing early strength of cement mortar. In-situ carbonation and faujasite show synergistic effect on reducing setting time. In-situ carbonation via CO2-impregnated faujasite facilitates cement hydration.
Abstract This study explores the use of in-situ carbonation using CO2-impregnated faujasite (FAU) for accelerating the curing of cement mortar. Results indicate that adding 3–12 wt% CO2-impregnated FAU reduces the setting time of the mortars by 2–11% and significantly enhances the compressive strength of the mortars at 1, 7, and 28 days, compared to plain FAU. Microstructural analyses reveal that the in-situ carbonation promotes the hydration of cement by providing additional calcium carbonate nucleation sites for the C-S-H precipitation. This increases the formation of hydration products, which leads to the refinement of the pore structure. Additionally, the in-situ carbonation results in the formation of calcium carbonate crystals with a particle size of 150–200 nm at 28 days, with the calcium carbonate content increased by 1.9 wt% at an addition level of 12 wt% CO2-impregnated FAU. Overall, the in-situ carbonation technique shows great promise as an alternative method for accelerating the curing of cement-based materials, particularly for cast-in-place concrete.
Accelerated curing of cement mortar: In-situ carbonation utilising CO2-impregnated faujasite
Luo, Wenjie (Autor:in) / Li, Bo (Autor:in) / Xu, Mengxia (Autor:in) / Pang, Chengheng (Autor:in) / Lester, Edward (Autor:in) / Kow, Kien-Woh (Autor:in)
01.05.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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