Effects of Low-Temperature Environment on the Mechanical Properties and Crystal Characteristics of Alkali-Slag-Cementitious Materials
In this paper, the development of mechanical properties of alkali-activated slag under a low temperature was studied. The mechanism of the alkali-activated condensation reaction and the damage mechanism under a low-temperature environment were analyzed in detail. Further, the formation and growth ch...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-02-01
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| Series: | Crystals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4352/15/3/218 |
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| Summary: | In this paper, the development of mechanical properties of alkali-activated slag under a low temperature was studied. The mechanism of the alkali-activated condensation reaction and the damage mechanism under a low-temperature environment were analyzed in detail. Further, the formation and growth characteristics of alkali-activated slag crystals in a low-temperature environment, as well as the microstructure formation, development, and evolution, were examined by microscopic analyses. Results showed that the early-age compressive strength of developed composites significantly decreased with decreasing curing temperature, while the later compressive strength development lagged. The lower the temperature, the more pronounced the lag phenomenon. At 0 °C, the 28-day compressive strength still reaches 38.7 MPa. At −10 °C, the condensation reaction can continue, and the compressive strength continues to develop. The low temperature inhibits the formation and growth of calcium silicate and aluminum silicate mineral crystals, resulting in a decreased efficiency of condensation reaction and continuous deterioration of microstructure, which leads to reduced compressive strength. |
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| ISSN: | 2073-4352 |