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Beneficiation of recycled concrete fines through accelerated carbonation
https://orcid.org/http://orcid.org/0000-0002-0130-4976
In the present work, the effects of accelerated carbonation on the physical and microstructural properties of recycled concrete fines are systematically studied. The RCF was prepared by crushing a base CEM I concrete mixture made in laboratory with a water-to-cement ratio of 0.54 and seal-cured for 28 days. The effects of CO2 overpressure, ambient temperature, and duration of carbonation on the CO2 uptake, water absorption, and porosity of RCFs are investigated in a central composite design of experiments. The microstructural and mineralogical changes as a results of carbonation are explored via scanning electron microscopy and X-ray diffractometry. The results show that carbonation under 0.5 bar of CO2 pressure at 80 °C leads to the highest CO2 uptake and highest drop in the porosity/water absorption of RCF. The RCF produced under the above conditions was used in comparison with non-carbonated RCF as partial replacement of mortar sand. The mixtures containing 70% sand replacement with carbonated RCF showed a higher initial flowability and approximately 20% higher 28-d compressive strength compared to references containing non-carbonated RCF.
Beneficiation of recycled concrete fines through accelerated carbonation
https://orcid.org/http://orcid.org/0000-0002-0130-4976
In the present work, the effects of accelerated carbonation on the physical and microstructural properties of recycled concrete fines are systematically studied. The RCF was prepared by crushing a base CEM I concrete mixture made in laboratory with a water-to-cement ratio of 0.54 and seal-cured for 28 days. The effects of CO2 overpressure, ambient temperature, and duration of carbonation on the CO2 uptake, water absorption, and porosity of RCFs are investigated in a central composite design of experiments. The microstructural and mineralogical changes as a results of carbonation are explored via scanning electron microscopy and X-ray diffractometry. The results show that carbonation under 0.5 bar of CO2 pressure at 80 °C leads to the highest CO2 uptake and highest drop in the porosity/water absorption of RCF. The RCF produced under the above conditions was used in comparison with non-carbonated RCF as partial replacement of mortar sand. The mixtures containing 70% sand replacement with carbonated RCF showed a higher initial flowability and approximately 20% higher 28-d compressive strength compared to references containing non-carbonated RCF.
Beneficiation of recycled concrete fines through accelerated carbonation
https://orcid.org/http://orcid.org/0000-0002-0130-4976
In the present work, the effects of accelerated carbonation on the physical and microstructural properties of recycled concrete fines are systematically studied. The RCF was prepared by crushing a base CEM I concrete mixture made in laboratory with a water-to-cement ratio of 0.54 and seal-cured for 28 days. The effects of CO2 overpressure, ambient temperature, and duration of carbonation on the CO2 uptake, water absorption, and porosity of RCFs are investigated in a central composite design of experiments. The microstructural and mineralogical changes as a results of carbonation are explored via scanning electron microscopy and X-ray diffractometry. The results show that carbonation under 0.5 bar of CO2 pressure at 80 °C leads to the highest CO2 uptake and highest drop in the porosity/water absorption of RCF. The RCF produced under the above conditions was used in comparison with non-carbonated RCF as partial replacement of mortar sand. The mixtures containing 70% sand replacement with carbonated RCF showed a higher initial flowability and approximately 20% higher 28-d compressive strength compared to references containing non-carbonated RCF.
Beneficiation of recycled concrete fines through accelerated carbonation
Mater Struct
Gholizadeh-Vayghan, Asghar (author) / Snellings, Ruben (author)
2022-09-01
Article (Journal)
Electronic Resource
English
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