Mechanical properties of graphene-reinforced reactive powder concrete at different strain rates
作者： Jialiang Wang , Sufen Dong , Xun Yu , Baoguo Han
DOI: 10.1007/S10853-019-04246-5
关键词: Strain rate 、 Strain energy 、 Ultimate tensile strength 、 Composite material 、 Materials science 、 Graphene 、 Compressive strength 、 Toughness 、 Brittleness 、 Cracking
摘要: The brittle nature of reactive powder concrete (RPC) and existence inertial stress (at high strain rates) made it suffer tensile failure seriously affected the safety structure. Graphene with low density small size easily dispersed in matrix, while its stiffness diameter-to-thickness ratio could effectively offset inertia stress, contributing to improve energy absorption concrete. In this paper, RPC was nano-modified by combining characteristics graphene mechanical behaviors under different rates were systematically studied, effects on performance analyzed. Finally, reinforcing mechanisms understood, dynamic compression constitutive established, which provided a theoretical basis for understanding properties material first time. Experimental results showed that quasi-static loads, incorporation significantly enhanced compressive toughness RPC. Under rate loads (strain 200–800/s), strength, peak ultimate graphene-reinforced increased 59.1 MPa/63.9%, 4300 μe/66.0% 12150 μe/32.7%, respectively. Additionally, impact 117%. mainly attributed their nucleation bridging effect. Furthermore, interlaminar slip structural fracture further absorbed released cracking therefore improved
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