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A platform for research: civil engineering, architecture and urbanism
Low carbon cementitious composites: Calcined quarry dust modified lime/sodium sulfate-activated slag
https://orcid.org/0000-0003-1356-6399
Highlights The CD addition slightly accelerated the slag reaction. Reduced flowability and setting time were noticed in CD-doped composites. Strength of composite with 5% CD could reach 8.21 MPa and 38.22 MPa at 1d and 28d age. CD modified composites showed competitive cost and environmental performance.
Abstract Calcined quarry dust (CD) was used to modify lime/Na2SO4-activated slag in the present work. The effect of the CD loading on the properties of the slag composites was carefully assessed by analyzing the reaction kinetics, physical properties, phase assemblies, and microstructure of the composites. Isothermal calorimetry analysis indicated that the addition of CD promoted the slag reaction, resulting in the compressive strength to be increased by around 48% with the presence of 5% CD at 1d. At the same time, both the initial and final setting were also promoted, decreased by approximately 5.8% and 8.7%, respectively. X-ray diffraction (XRD) and thermogravimetric (TG) analyses showed that C-S-H and hydrotalcite (Ht) were the main hydration products in the CD-modified composites, and the content of Ht was increased by around 27.4% when adding 5% CD after curing for 60d. Moreover, CD incorporation afforded a denser matrix with the total porosity decreased by about 10.0%, which was favorable for strength development of the composites. Compared with traditional NaOH- or Na2SiO3-activated slag, the composites in this study are cost-competitive and environmentally benign.
Low carbon cementitious composites: Calcined quarry dust modified lime/sodium sulfate-activated slag
https://orcid.org/0000-0003-1356-6399
Highlights The CD addition slightly accelerated the slag reaction. Reduced flowability and setting time were noticed in CD-doped composites. Strength of composite with 5% CD could reach 8.21 MPa and 38.22 MPa at 1d and 28d age. CD modified composites showed competitive cost and environmental performance.
Abstract Calcined quarry dust (CD) was used to modify lime/Na2SO4-activated slag in the present work. The effect of the CD loading on the properties of the slag composites was carefully assessed by analyzing the reaction kinetics, physical properties, phase assemblies, and microstructure of the composites. Isothermal calorimetry analysis indicated that the addition of CD promoted the slag reaction, resulting in the compressive strength to be increased by around 48% with the presence of 5% CD at 1d. At the same time, both the initial and final setting were also promoted, decreased by approximately 5.8% and 8.7%, respectively. X-ray diffraction (XRD) and thermogravimetric (TG) analyses showed that C-S-H and hydrotalcite (Ht) were the main hydration products in the CD-modified composites, and the content of Ht was increased by around 27.4% when adding 5% CD after curing for 60d. Moreover, CD incorporation afforded a denser matrix with the total porosity decreased by about 10.0%, which was favorable for strength development of the composites. Compared with traditional NaOH- or Na2SiO3-activated slag, the composites in this study are cost-competitive and environmentally benign.
Low carbon cementitious composites: Calcined quarry dust modified lime/sodium sulfate-activated slag
https://orcid.org/0000-0003-1356-6399
Highlights The CD addition slightly accelerated the slag reaction. Reduced flowability and setting time were noticed in CD-doped composites. Strength of composite with 5% CD could reach 8.21 MPa and 38.22 MPa at 1d and 28d age. CD modified composites showed competitive cost and environmental performance.
Abstract Calcined quarry dust (CD) was used to modify lime/Na2SO4-activated slag in the present work. The effect of the CD loading on the properties of the slag composites was carefully assessed by analyzing the reaction kinetics, physical properties, phase assemblies, and microstructure of the composites. Isothermal calorimetry analysis indicated that the addition of CD promoted the slag reaction, resulting in the compressive strength to be increased by around 48% with the presence of 5% CD at 1d. At the same time, both the initial and final setting were also promoted, decreased by approximately 5.8% and 8.7%, respectively. X-ray diffraction (XRD) and thermogravimetric (TG) analyses showed that C-S-H and hydrotalcite (Ht) were the main hydration products in the CD-modified composites, and the content of Ht was increased by around 27.4% when adding 5% CD after curing for 60d. Moreover, CD incorporation afforded a denser matrix with the total porosity decreased by about 10.0%, which was favorable for strength development of the composites. Compared with traditional NaOH- or Na2SiO3-activated slag, the composites in this study are cost-competitive and environmentally benign.
Low carbon cementitious composites: Calcined quarry dust modified lime/sodium sulfate-activated slag
Hangxing, Ding (author) / Shiyu, Zhang (author) / Xiaolong, Zhang (author) / Zhaohao, Zhang (author) / Yingliang, Zhao (author)
2021-01-23
Article (Journal)
Electronic Resource
English
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