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Li Song,Zhiwei Fan,Jian Hou 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.4
The fatigue flexural behavior of corroded reinforced concrete (RC) beams was experimentally and analytically examined. Seven beams were constructed and tested, and an analytical fatigue prediction model (FPM) was proposed to assess the fatigue behavior of the corroded beams. After validating the FPM with the experimental test results, the FPM was then extended to better understand the effects of the degree of steel corrosion, the corrosion pit geometry, and the fatigue load level on the performance of corroded RC beams. The results show that the fatigue behavior of the corroded steel bars determines the fatigue behavior of the beams. Rebar corrosion has a significant detrimental effect on the fatigue performance of RC beams due to stress concentration, loss of steel cross-sectional area, and diminished bonding at the steel-concrete interface. The stress concentrations increase with increasing pit width-to-length and depth-to-diameter ratios. Differences in pit geometry and the resulting changes in stress concentrations due to corrosion should be considered when assessing fatigue performance.
Liyuan Qin,Yang Wua,Zhiwei Hou,Shihui Zhang,Enchen Jiang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
Swine manure activated carbon (SMAC) with self-co-doped metallic compounds and heteroatoms wasprepared by combining KOH activation with pyrolysis. The structure, electrochemical performance andadsorption of SMACs prepared with various activation temperatures, activation times, alkali-carbonratios and pickling steps were investigated. A hierarchical pore structure existed in all the SMACs, whichshowed excellent and significantly different properties, including a specific capacitance of 278 F/g, and ahigh SSA of 2321 m2/g (SMACHF), which retained 100% of its capacitance after 10,000 cycles at 5 A/g and aPb2+ adsorption capacity of 211.8 mg/g at room temperature (SMACNON). The SMACs contained heteroatomfunctional groups and Si, Ca and Mg compounds, which did not produce pseudocapacitors but didincrease the Pb2+ adsorption capacity and electrochemical cycling stability. The Pb2+ adsorption capacitiesof SMACNON, SMACPHF and SMACHF corresponded to the effect of the functional group content ratherthan the effect of the SSA. These porous carbons were derived from inexpensive swine manure, combinesuitable porosity with metallic elements and heteroatom doping, and have promising uses in multifunctionalapplications.