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Experimental study on the shrinkage reduction of high strength strain-hardening cementitious composites
https://orcid.org/0000-0003-1179-7142
https://orcid.org/0000-0002-1480-1824
Abstract Recent studies show that high strength strain-hardening cementitious composite (SHCC) can serve as a potential repair material for deteriorated reinforced concrete structures due to its excellent properties in terms of strength, ductility and durability. However, a major problem of high strength cementitious mix is the excessive shrinkage after hardening, which may cause premature cracking or weak bonding with the substrate after the repair. In this study, the shrinkage property of high strength SHCC was investigated experimentally. Shrinkage reducing admixture (SRA) and calcium sulfoaluminate (CSA) cement were employed at different dosages to study their effects on the shrinkage reduction under different conditions as well as the mechanical performance. Results reveal that a larger dosage of SRA can reduce the shrinkage more, while the effectiveness of CSA cement addition depends on the relation between the hydration degree of CSA cement and the setting time. The combined use of SRA and CSA cement produces even lower shrinkage. Regarding the mechanical performance, both additives reduce the compressive and tensile strengths, with CSA cement showing a greater effect.
Experimental study on the shrinkage reduction of high strength strain-hardening cementitious composites
https://orcid.org/0000-0003-1179-7142
https://orcid.org/0000-0002-1480-1824
Abstract Recent studies show that high strength strain-hardening cementitious composite (SHCC) can serve as a potential repair material for deteriorated reinforced concrete structures due to its excellent properties in terms of strength, ductility and durability. However, a major problem of high strength cementitious mix is the excessive shrinkage after hardening, which may cause premature cracking or weak bonding with the substrate after the repair. In this study, the shrinkage property of high strength SHCC was investigated experimentally. Shrinkage reducing admixture (SRA) and calcium sulfoaluminate (CSA) cement were employed at different dosages to study their effects on the shrinkage reduction under different conditions as well as the mechanical performance. Results reveal that a larger dosage of SRA can reduce the shrinkage more, while the effectiveness of CSA cement addition depends on the relation between the hydration degree of CSA cement and the setting time. The combined use of SRA and CSA cement produces even lower shrinkage. Regarding the mechanical performance, both additives reduce the compressive and tensile strengths, with CSA cement showing a greater effect.
Experimental study on the shrinkage reduction of high strength strain-hardening cementitious composites
https://orcid.org/0000-0003-1179-7142
https://orcid.org/0000-0002-1480-1824
Abstract Recent studies show that high strength strain-hardening cementitious composite (SHCC) can serve as a potential repair material for deteriorated reinforced concrete structures due to its excellent properties in terms of strength, ductility and durability. However, a major problem of high strength cementitious mix is the excessive shrinkage after hardening, which may cause premature cracking or weak bonding with the substrate after the repair. In this study, the shrinkage property of high strength SHCC was investigated experimentally. Shrinkage reducing admixture (SRA) and calcium sulfoaluminate (CSA) cement were employed at different dosages to study their effects on the shrinkage reduction under different conditions as well as the mechanical performance. Results reveal that a larger dosage of SRA can reduce the shrinkage more, while the effectiveness of CSA cement addition depends on the relation between the hydration degree of CSA cement and the setting time. The combined use of SRA and CSA cement produces even lower shrinkage. Regarding the mechanical performance, both additives reduce the compressive and tensile strengths, with CSA cement showing a greater effect.
Experimental study on the shrinkage reduction of high strength strain-hardening cementitious composites
Chen, Yixin (author) / Yao, Jie (author) / Lu, Zeyu (author) / Leung, Christopher K.Y. (author)
2019-09-10
Article (Journal)
Electronic Resource
English
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