Study on Impact Resistance of Alkali-Activated Slag Cementitious Material with Steel Fiber
Alkali-activated slag cementitious materials (AASCMs) use alkaline activators to activate blast furnace slag and waste slag to replace traditional Portland cement, which can reduce CO<sub>2</sub> emissions. An impact resistance test and scanning electron microscopy (SEM) microscopic perf...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-10-01
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| Series: | Buildings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-5309/14/11/3442 |
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| Summary: | Alkali-activated slag cementitious materials (AASCMs) use alkaline activators to activate blast furnace slag and waste slag to replace traditional Portland cement, which can reduce CO<sub>2</sub> emissions. An impact resistance test and scanning electron microscopy (SEM) microscopic performance analysis of alkali-activated slag cementitious material specimens with four different steel-fiber contents are performed. The effects of steel-fiber volume content and strain rate on the dynamic elastic modulus <i>E</i><sub>d</sub>, dynamic compressive strength <i>σ</i><sub>d</sub>, dynamic peak compressive strain <i>ε</i><sub>c</sub>, and energy absorption of the AASCM-SS are studied. The results indicate that the dynamic elastic modulus <i>E</i><sub>d</sub>, dynamic compressive strength <i>σ</i><sub>d</sub>, and energy absorption of the AASCM-SS increase with the increase of strain rate, and the dynamic peak compressive strain <i>ε</i><sub>c</sub> decreases with the increase of strain rate. The dynamic elastic modulus <i>E</i><sub>d</sub>, dynamic compressive strength <i>σ</i><sub>d</sub>, and dynamic peak compressive strain <i>ε</i><sub>c</sub> of the SS-AASCM increase first and then decrease with the increase of steel-fiber content. When the steel-fiber content is 0.5%, the <i>σ</i><sub>d</sub> and <i>ε</i><sub>c</sub> of the AASCM-SS are the highest, increased by 9.9% and 19.3%. The energy absorption of AASCM-SS increases with the increase of steel-fiber content. A dynamic constitutive model of the FR-AASCM considering the influence of damage, strain rate, and steel-fiber volume fraction is established. The proposed constitutive model is in acceptable agreement with the experimental AASCM-SS dynamic stress–strain curve, and the correlation coefficient is 0.91. |
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| ISSN: | 2075-5309 |