Abstract
The large shrinkage strain of Engineered Cementitious Composites (ECC) seriously affects its combined application with steel tube in engineering. In order to reduce the shrinkage of ECC and realize the effective bonding between ECC and steel tube, this paper studied the effects of single or multiple doped of expansive and internal curing agent on the shrinkage and mechanical properties of ECC, and tested the interfacial bond strength between ECC and steel tube. CaO and MgO compound expansive agent (CME), calcium sulfoaluminate expansive agent (HCSA), super water-absorbing polymer (SAP) internal curing agent are chosen for test. The results show that ECC mixed with 10% CME expansive agent and 0.2% SAP shows a slight expansion under the condition of sprinkling water curing. Moreover, the push-out test shows that the bond strength between micro-expanded ECC and steel tube reaches 1.27 MPa, which is nearly 2 times higher than that of the ordinary ECC, and higher than the bond strength of C50 filled steel tube. This paper provides the test and theoretical basis for the joint application of ECC with steel tube.
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Acknowledgments
This research was partially funded by the National Natural Science Foundation of China [Project 52179127 and 51978234], the Natural Science Foundation of Hebei Province of China [Project E2020202015] and Key research and development projects of Hebei Province [Project 19217617D]. This research was performed at the Hebei University of Technology. The support is gratefully acknowledged.
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Gao, S., Zhang, Y. Optimal Design of Micro-expanded ECC and Its Interfacial Bonding Property with Steel Tube. KSCE J Civ Eng 27, 4444–4458 (2023). https://doi.org/10.1007/s12205-023-0428-y
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DOI: https://doi.org/10.1007/s12205-023-0428-y