CFRP Reinforced Foam Concrete Subjected to Dynamic Compression at Medium Strain Rate

Abstract

Carbon fiber-reinforced polymer (CFRP)-confined foam concrete can be applied in structure protection, e.g., as an impact barrier of bridge piers, in which it is used as the core of the composite impact barrier. Applying CFRP to the foam concrete exterior enhances both the CFRP and the foam concrete, leading to improved compressive performance due to their interaction. In the present study, the carbon-fiber reinforced polymer (CFRP) confining effect on the response and energy absorption of foam concrete subjected to quasi-static and medium-strain-rate dynamic compression was experimentally investigated. The confinement by CFRP changed the response and failure mode of foam concrete specimens from shear in quasi-static load and splitting in dynamic load to crushing, resulting in a significant increase in the load bearing and energy absorption capacity. The composite consisting of CFRP and foam concrete was sensitive to strain rate. In particular, the CFRP–foam concrete interaction led to the remarkably improved resistance and energy absorption capacity of CFRP-confined specimens, which were significantly higher than the sum of those of standalone CFRP and foam concrete.

Pressure- and Temperature-Dependent Crystallization Kinetics of Isotactic Polypropylene under Process Relevant Conditions

“…The sample was cooled with air at a rate of about 7 K/min. The crystallization temperature was determined at the intersection of the slopes fitted on the specific volume in the melt state and during crystallization, as reported in the literature [31,38]. The samples showed no signs of thermal degradation (color change) after removal.…”

Quasi-static tests on RC building columns strengthened with CFRP

“…The results and comparisons made during realization of a comprehensive experimental research program on samples of plain concrete and concrete strengthened by FRP can be found in [6]. Strengthening with carbon fibre-reinforced polymers was investigated by Wang Lu Liu et al [7], who experimentally investigated and compared the response, failure mode, and energy absorption of foam concrete with and without CFRP confinement, when subjected to quasi-static and dynamic loading. Several important outcomes were achieved in this study:…”

An Experimental Study of Dynamic Compression Performance of Self-Compacting Concrete

“…Under the service life of a concrete structure, it is not only subjected to static load but also may be subjected to dynamic load. Therefore, it is a need to study the dynamic behavior of concrete [ 4 , 5 ].…”

“…In practice, SCC not only bears the static load, but also bears dynamic loads, such as earthquake, wind, impact and explosion, etc, under which circumstances the SCC exhibits obvious strain rate effect [ 27 , 28 ], i.e., the mechanical properties of SCC are influcenced by the strain rate. Therefore, the research of concrete dynamic performance has extremely value of civil engineering [ 4 , 5 , 29 ]. However, almost all the previous studies on the dynamic properties of concrete are focused on ordinary concrete.…”