A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of conditions on wet carbonation products of recycled cement paste powder
https://orcid.org/0000-0002-5316-6421
Abstract Wet carbonation is deemed a successful approach to recycling waste concrete powder. Controlling the growth and properties of products in the recycled cement paste powder (CPP) is highly dependent on the wet carbonation conditions. Therefore, this study aims to examine the effect of wet carbonation parameters on wet carbonation products in CPP. The wet carbonation of CPP resulted in mixed distribution of silica gel and CaCO3 without significant layering on the CaCO3. In contrast, silica gel covered the outside of the CaCO3 in the case of dry carbonation. Increasing the temperature from 25 °C to 80 °C promoted and accelerated the crystallization and growth of amorphous CaCO3, increased the crystallite size of CaCO3 by 1.1–5.1 nm, and favored the formation of aragonite and vaterite; however, it also led to a significant crystal defect and/or distortion within CaCO3. Higher temperatures also promoted silica gel formation and increased its polymerization degree by 68.2%. On the other hand, increasing the CO2 flow rate from 3 L/min to 5 L/min facilitated the crystallization and growth of CaCO3 and contributed to the increase in the crystallite size of CaCO3 by 3.0–6.6 nm. Higher CO2 flow led to the incorporation of aluminum into silica gel and resulted in the transformation of its gel pores into capillary pores. The findings of this study contribute to a better understanding of the best experimental parameters to achieve a more efficient and effective concrete waste recycling process.
Highlights Carbonation of CPP in an aqueous solution was performed under various conditions. Higher CO2 flow rate had a negligible effect on CaCO3 polymorphs. Higher temperature and CO2 flow rate promoted the crystallization and growth of CaCO3. Elevated temperature enhanced silica gel formation and its polymerization. CO2 flow rate influenced the pore structure and aluminum uptake in silica gel.
Effect of conditions on wet carbonation products of recycled cement paste powder
https://orcid.org/0000-0002-5316-6421
Abstract Wet carbonation is deemed a successful approach to recycling waste concrete powder. Controlling the growth and properties of products in the recycled cement paste powder (CPP) is highly dependent on the wet carbonation conditions. Therefore, this study aims to examine the effect of wet carbonation parameters on wet carbonation products in CPP. The wet carbonation of CPP resulted in mixed distribution of silica gel and CaCO3 without significant layering on the CaCO3. In contrast, silica gel covered the outside of the CaCO3 in the case of dry carbonation. Increasing the temperature from 25 °C to 80 °C promoted and accelerated the crystallization and growth of amorphous CaCO3, increased the crystallite size of CaCO3 by 1.1–5.1 nm, and favored the formation of aragonite and vaterite; however, it also led to a significant crystal defect and/or distortion within CaCO3. Higher temperatures also promoted silica gel formation and increased its polymerization degree by 68.2%. On the other hand, increasing the CO2 flow rate from 3 L/min to 5 L/min facilitated the crystallization and growth of CaCO3 and contributed to the increase in the crystallite size of CaCO3 by 3.0–6.6 nm. Higher CO2 flow led to the incorporation of aluminum into silica gel and resulted in the transformation of its gel pores into capillary pores. The findings of this study contribute to a better understanding of the best experimental parameters to achieve a more efficient and effective concrete waste recycling process.
Highlights Carbonation of CPP in an aqueous solution was performed under various conditions. Higher CO2 flow rate had a negligible effect on CaCO3 polymorphs. Higher temperature and CO2 flow rate promoted the crystallization and growth of CaCO3. Elevated temperature enhanced silica gel formation and its polymerization. CO2 flow rate influenced the pore structure and aluminum uptake in silica gel.
Effect of conditions on wet carbonation products of recycled cement paste powder
https://orcid.org/0000-0002-5316-6421
Abstract Wet carbonation is deemed a successful approach to recycling waste concrete powder. Controlling the growth and properties of products in the recycled cement paste powder (CPP) is highly dependent on the wet carbonation conditions. Therefore, this study aims to examine the effect of wet carbonation parameters on wet carbonation products in CPP. The wet carbonation of CPP resulted in mixed distribution of silica gel and CaCO3 without significant layering on the CaCO3. In contrast, silica gel covered the outside of the CaCO3 in the case of dry carbonation. Increasing the temperature from 25 °C to 80 °C promoted and accelerated the crystallization and growth of amorphous CaCO3, increased the crystallite size of CaCO3 by 1.1–5.1 nm, and favored the formation of aragonite and vaterite; however, it also led to a significant crystal defect and/or distortion within CaCO3. Higher temperatures also promoted silica gel formation and increased its polymerization degree by 68.2%. On the other hand, increasing the CO2 flow rate from 3 L/min to 5 L/min facilitated the crystallization and growth of CaCO3 and contributed to the increase in the crystallite size of CaCO3 by 3.0–6.6 nm. Higher CO2 flow led to the incorporation of aluminum into silica gel and resulted in the transformation of its gel pores into capillary pores. The findings of this study contribute to a better understanding of the best experimental parameters to achieve a more efficient and effective concrete waste recycling process.
Highlights Carbonation of CPP in an aqueous solution was performed under various conditions. Higher CO2 flow rate had a negligible effect on CaCO3 polymorphs. Higher temperature and CO2 flow rate promoted the crystallization and growth of CaCO3. Elevated temperature enhanced silica gel formation and its polymerization. CO2 flow rate influenced the pore structure and aluminum uptake in silica gel.
Effect of conditions on wet carbonation products of recycled cement paste powder
Mao, Yuguang (author) / He, Pingping (author) / Drissi, Sarra (author) / Zhang, Jian (author) / Hu, Xiang (author) / Shi, Caijun (author)
2023-09-28
Article (Journal)
Electronic Resource
English
Carbonation-cementation of recycled hardened cement paste powder
| British Library Online Contents | 2018
Effect of alkalis on products of enforced carbonation of cement paste
| Elsevier | 2021
CO2 Carbonation method of cement paste included recycled aggregate using carbon dioxide nano bubble
| European Patent Office | 2024