We demonstrate a new recycling technology using simple equipment and nontoxic electrolyte to reclaim intact carbon fibers.

： Reinforced concrete (RC) stub columns are commonly featured in the construction industry, used in structures such as buildings and bridges. In coastal areas, bridge piers are subjected to serious corrosion damage, which may result in safety issues and huge economic losses. Currently, one of the most widely used retrofitting methods is the application of fiber reinforced polymer (FRP) sheets. This strengthening method can effectively improve the column capacities. However, as time goes by, the corrosion of re-bars will continue, leading to less force resistance. Impressed current cathodic protection (ICCP) is a well-known, efficient method to prevent further corrosion of the re-bars. Therefore, this study uses both ICCP and structural strengthening (SS) techniques to strengthen corroded RC columns. An experimental program consisting of 10 stub columns was carried out, including a 100-day accelerated corrosion process and 100-day ICCP protection and compression tests. Results show that the proposed ICCP-SS retrofitting method is not only effective in retarding the

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This paper experimentally studies the effects of fly ash on the diffusion, bonding, and micro-properties of chloride penetration in concrete in a water soaking environment based on the natural diffusion law. Different fly ash replacement ratio of cement in normal concrete was investigated. The effect of fly ash on chloride transportation, diffusion, coefficient, free chloride content, and binding chloride content were quantified, and the concrete porosity and microstructure were also reported through mercury intrusion perimetry and scanning electron microscopy, respectively. It was concluded from the test results that fly ash particles and hydration products (filling and pozzolanic effects) led to the densification of microstructures in concrete. The addition of fly ash greatly reduced the deposition of chloride ions. The chloride ion diffusion coefficient considerably decreased with increasing fly ash replacement, and fly ash benefits the binding of chloride in concrete. Additionally, a new equation is proposed to predict chloride binding capacity based on the test results.