TY - JOUR
T1 - Effects of carbohydrates and sulfonates during CaO hydration on portlandite microstructure
AU - Pesce, Cecilia
AU - Ball, Richard J.
AU - Molinari, Marco
AU - Reeksting, Shaun
AU - Pesce, Gianluca Luca
N1 - Funding information: This research was funded by Northumbria University through the RDF fund that supported the doctoral project: “Tailoring lime properties to the modern construction industry. The effects of organic additives and alternative slaking methods on portlandite mineralogy” carried out by Cecilia Pesce.
PY - 2024/1/1
Y1 - 2024/1/1
N2 - This study evaluates the effect of ten organic additives belonging to the classes of carbohydrates and sulfonates on the microstructure of portlandite crystals during CaO hydration. Calcium hydroxide modified with selected additives was prepared and characterised in terms of crystal size and habit, platelets abundance, crystallinity, specific surface area, particle size distribution, calcium concentration and organics in solution, using XRD, SEM, N2 absorption/BET, laser diffraction, ICP-OES and HPLC-MS. The results suggest that the microstructure of portlandite is altered by the presence of carbohydrates and sulfonates, mostly showing higher platelets abundance, smaller crystallite size, and higher specific surface area. The presence of hydroxyl-rich carbohydrates induced more marked effects compared to sulfonates. These results show that it is possible to tailor the properties of lime to specific applications. Consequently, this study can impact the conservation and the construction industry by enabling the development of novel binders for modern construction with optimal properties, and more broadly fields such as the synthesis of precipitated calcium carbonate and the design of CO2 sorbents, all of which will have the added value of reducing the global anthropogenic CO2 emissions.
AB - This study evaluates the effect of ten organic additives belonging to the classes of carbohydrates and sulfonates on the microstructure of portlandite crystals during CaO hydration. Calcium hydroxide modified with selected additives was prepared and characterised in terms of crystal size and habit, platelets abundance, crystallinity, specific surface area, particle size distribution, calcium concentration and organics in solution, using XRD, SEM, N2 absorption/BET, laser diffraction, ICP-OES and HPLC-MS. The results suggest that the microstructure of portlandite is altered by the presence of carbohydrates and sulfonates, mostly showing higher platelets abundance, smaller crystallite size, and higher specific surface area. The presence of hydroxyl-rich carbohydrates induced more marked effects compared to sulfonates. These results show that it is possible to tailor the properties of lime to specific applications. Consequently, this study can impact the conservation and the construction industry by enabling the development of novel binders for modern construction with optimal properties, and more broadly fields such as the synthesis of precipitated calcium carbonate and the design of CO2 sorbents, all of which will have the added value of reducing the global anthropogenic CO2 emissions.
KW - Portlandite
KW - Organic additive
KW - Lime putty
KW - Microstructure
KW - CCS
UR - http://www.scopus.com/inward/record.url?scp=85177068898&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2023.107372
DO - 10.1016/j.cemconres.2023.107372
M3 - Article
SN - 0008-8846
VL - 175
JO - Cement and Concrete Research
JF - Cement and Concrete Research
M1 - 107372
ER -
