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.
| Original language | English |
|---|---|
| Article number | 116973 |
| Journal | Construction and Building Materials |
| Volume | 230 |
| DOIs | |
| State | Published - 10 Jan 2020 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2019 Elsevier Ltd
Keywords
- Calcined oyster shell powder
- Heat of hydration
- High volume slag cement
- Si nuclear magnetic resonance
- Thermal gravimetric analysis
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- General Materials Science