Mechanism of strength evolution of seawater OPC pastes
| Autor: | Wing Lun Lam, Yangyang Zhang, Yanjie Sun, Yamei Cai, Chi Sun Poon, Haibing Zheng |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Cement
Materials science business.industry Metallurgy 0211 other engineering and technologies 02 engineering and technology Building and Construction Structural engineering 021001 nanoscience & nanotechnology Microstructure law.invention stomatognathic diseases Portland cement Compressive strength nervous system law 021105 building & construction Seawater 0210 nano-technology business Civil and Structural Engineering |
| Zdroj: | Advances in Structural Engineering. 24:1256-1266 |
| ISSN: | 2048-4011 1369-4332 |
| DOI: | 10.1177/1369433221993299 |
| Popis: | This work investigated the strength degradation mechanisms of seawater ordinary Portland cement (OPC) pastes. Two types of specimens were prepared ((i) OSD sample (i.e. OPC was mixed with seawater, and then cured in deionized (DI) water) and (ii) ODD sample (i.e. OPC was mixed with DI water, and then cured in DI water, as the reference system)). The use of seawater in preparing OPC pastes effectively increased the hydration rate and early-age mechanical strength, but lowered the mechanical strength at the later age. The higher hydration degree and larger amounts of carbonates with a smaller crystal size enabled the seawater OPC pastes to exhibit a higher early-age mechanical strength, increasing by 13.0%–17.0% compared with the DI water OPC pastes. While the formation of Friedel’s salt and the formation of calcium-silicate-hydrate (C-S-H) gel with a lower polymerization degree and mean molecular chain length resulted in the deterioration of the pore structure and negatively affected the later-age strength development of the seawater OPC paste, decreasing by 5.8%–11.9% compared with the DI water OPC pastes. |
| Databáze: | OpenAIRE |
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