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Examining the potential of calcined oyster shell waste as additive in high volume slag cement
https://orcid.org/0000-0001-7855-9275
https://orcid.org/0000-0001-5937-6959
https://orcid.org/0000-0002-2317-4818
https://orcid.org/0000-0002-2224-2962
Highlights Calcined oyster shell (COS) waste was utilized as an additive for high volume slag cement binder. Addition of COS had a positive effect on strength development of high volume slag cement binder. COS increased the percentage of Ca2+ leading to higher cumulative heat evolution. Incorporation of COS refined the pore structure of high volume slag cement binder. Increased degree of hydration and mean chain length was observed for binder mixes containing COS powder.
Abstract The present study investigates the effect of calcined waste oyster shell powder as additive on the fresh, hardened and microstructural properties of high volume slag cement. The results provide that addition of calcined oyster shell powder enhanced the early age compressive strength. The hydration of calcined oyster shell powder resulted in additional portlandite formation during the initial reaction stage. The observations drawn from porosity measurements indicated that calcined oyster shell powder decreased the porosity of binder matrix at early and elongated duration of curing. Furthermore, by 29Si NMR it was observed that the hydration of high volume slag cement was also benefited by calcined oyster shell powder as indicated by increased degree of hydration and chain length. However, excess addition of calcined oyster shell powder caused decreased compressive strength development. Considering the results, calcined oyster shell powder can be used as additive in high volume slag cement.
Examining the potential of calcined oyster shell waste as additive in high volume slag cement
https://orcid.org/0000-0001-7855-9275
https://orcid.org/0000-0001-5937-6959
https://orcid.org/0000-0002-2317-4818
https://orcid.org/0000-0002-2224-2962
Highlights Calcined oyster shell (COS) waste was utilized as an additive for high volume slag cement binder. Addition of COS had a positive effect on strength development of high volume slag cement binder. COS increased the percentage of Ca2+ leading to higher cumulative heat evolution. Incorporation of COS refined the pore structure of high volume slag cement binder. Increased degree of hydration and mean chain length was observed for binder mixes containing COS powder.
Abstract The present study investigates the effect of calcined waste oyster shell powder as additive on the fresh, hardened and microstructural properties of high volume slag cement. The results provide that addition of calcined oyster shell powder enhanced the early age compressive strength. The hydration of calcined oyster shell powder resulted in additional portlandite formation during the initial reaction stage. The observations drawn from porosity measurements indicated that calcined oyster shell powder decreased the porosity of binder matrix at early and elongated duration of curing. Furthermore, by 29Si NMR it was observed that the hydration of high volume slag cement was also benefited by calcined oyster shell powder as indicated by increased degree of hydration and chain length. However, excess addition of calcined oyster shell powder caused decreased compressive strength development. Considering the results, calcined oyster shell powder can be used as additive in high volume slag cement.
Examining the potential of calcined oyster shell waste as additive in high volume slag cement
https://orcid.org/0000-0001-7855-9275
https://orcid.org/0000-0001-5937-6959
https://orcid.org/0000-0002-2317-4818
https://orcid.org/0000-0002-2224-2962
Highlights Calcined oyster shell (COS) waste was utilized as an additive for high volume slag cement binder. Addition of COS had a positive effect on strength development of high volume slag cement binder. COS increased the percentage of Ca2+ leading to higher cumulative heat evolution. Incorporation of COS refined the pore structure of high volume slag cement binder. Increased degree of hydration and mean chain length was observed for binder mixes containing COS powder.
Abstract The present study investigates the effect of calcined waste oyster shell powder as additive on the fresh, hardened and microstructural properties of high volume slag cement. The results provide that addition of calcined oyster shell powder enhanced the early age compressive strength. The hydration of calcined oyster shell powder resulted in additional portlandite formation during the initial reaction stage. The observations drawn from porosity measurements indicated that calcined oyster shell powder decreased the porosity of binder matrix at early and elongated duration of curing. Furthermore, by 29Si NMR it was observed that the hydration of high volume slag cement was also benefited by calcined oyster shell powder as indicated by increased degree of hydration and chain length. However, excess addition of calcined oyster shell powder caused decreased compressive strength development. Considering the results, calcined oyster shell powder can be used as additive in high volume slag cement.
Examining the potential of calcined oyster shell waste as additive in high volume slag cement
Naqi, Ali (author) / Siddique, Salman (author) / Kim, Hyeong-Ki (author) / Jang, Jeong Gook (author)
2019-09-14
Article (Journal)
Electronic Resource
English
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