| Since the reform and opening up, China’s economic rapid development, especially inrecent years. While a large number of building renovation or expansion, generating ahuge amount of waste concrete. After the recovery of waste concrete blocks, cracking,crushing, screening, according to a certain proportion of recycled aggregate gradationmixed form, made of recycled concrete instead of natural aggregate, both to solve thequarry damage caused to the natural environment and reducing landfill andenvironmental pollution problems the city covers an area of waste.Studies have shown that recycled aggregate surface parcels have hardened cementmortar, aggregate interface with high porosity, water absorption characteristics of large,resulting recycled concrete impermeability, frost resistance, durability and other lowercarbonation. For structural features and interface morphology, the interface can bemixed with bonding agents to strengthen the role of interfacial transition zone, HefeiUniversity of Technology research group incorporation of recycled fly ash concretemodified tests, studies show that the incorporation of an appropriate amount of fly ashafter recycled concrete anti-carbonation, freeze-thaw resistance, such as resistance tochloride ion penetration increased durability. But the destruction of a modified form ofthe recycled concrete structure, carrying capacity, hysteretic behavior, ductility andenergy dissipation capacity targets for further study.Based on preliminary experimental study on the production of two specimens ofrecycled concrete frame edge node specimens, two specimens of the specimen aremade of100%recycled aggregate, the entire specimen BJ-1using cement as a bindingmaterial, specimen BJ-215%of fly ash to replace cement quality is modified, twospecimens were tested for quasi-static studies to explore the similarities and differencesof the seismic performance of recycled concrete and ordinary modification of recycledconcrete frame side nodes.Showed regeneration of modified and non-modified concrete component membershave good seismic performance, a slight decline in capacity than ordinary concretestrength by analyzing the test results. Modification of recycled concrete edge nodespecimens ductility index slightly higher energy capacity has declined, and the seismicperformance of the specimen recycled concrete specimen is quite common. For fly ashmixed with the right amount of damage morphology, carrying capacity, the smaller theimpact ductility and energy dissipation capacity indicators, recycled concrete can be improved by mixing anti-carbonation means of fly ash, freeze-thaw resistance,resistance to chloride ion penetration durability and the like.Finally, using the finite element software ABAQUS large commercial specimens oftwo specimens of the numerical simulation, and analysis of experimental resultsobtained with stress cloud of concrete and reinforced stress were compared. Contrast interms of yield patterns, ultimate load, stress distribution, finite element simulation andexperimental results are in good agreement. |
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