Mechanical Properties of Ordinary Concrete Confined with Engineered Cementitious Composites (ECC)
KANG Yingjie1,2,3, GUO Zili4, YE Binbin4, PAN Peng4,5,*
1 State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China 2 Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, Shijiazhuang 050043, China 3 School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China 4 Department of Civil Engineering, Tsinghua University, Beijing 100084, China 5 Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Tsinghua University, Beijing 100084, China
Abstract: Composite specimens of ordinary concrete confined with engineered cementitious composites (ECC) were prepared, considering the comprehensive utilization of the advantage of ECC in mechanical properties and the low price of ordinary concrete. Tests of compressive, tensile, and flexural were carried out, and the basic mechanical properties of composite specimens were systematically studied. The bending behavior of reinforced composite beams was also studied by numerical analysis method. The results show that the interface between ECC and concrete did not slip when the composite specimen was damaged by force, and the two materials bonded reliably to achieve synergistic stresses. Compared with ordinary concrete specimens, the compressive strength, tensile strength and flexural strength of composite specimens are improved, especially the flexural strength are most significantly improved. For the beam with a section of 100 mm×100 mm, the flexural strength is increased by 27.4% and 57.1% respectively, when the thickness of ECC is 10 mm and 15 mm. The composite specimen has considerable ductile deformation ability, and can maintain a certain integrity after failure, so it has the characteristics of high toughness. Compared with ordinary reinforced concrete beams, reinforced composite beams can take advantage of the performance advantages of ECC to significantly improve the bearing and deformation capacity.
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2024, Vol. 38 
