Experimental Study On Seismic Behavior Of Graphite Oxide Recycled Concrete Columns

With the continuous development of social economy,the research on the recycling of construction waste is particularly important.At present,recycled concrete technology can not only effectively alleviate the shortage of resources,but also significantly reduce the burden of environmental pollution for urban renewal and construction.Due to the poor physical and mechanical properties of recycled concrete,it is one of the main research hotspots for domestic and foreign scholars to modify RC by various means and apply it to practical engineering.As a new kind of nano material with excellent physical and mechanical properties and easy to obtain,graphene oxide as an additive in RC has been proved to be able to effectively improve the mechanical properties of RC foundation.However,there is still a lack of research on the performance of reinforced concrete when it is used as structural member material.In order to effectively improve the application scope of RC in structures and promote the development of RC structure application technology,it is necessary to carry out experimental research on seismic performance of RC-GO when it is applied to structural members.In this paper,12 groups of 36 RC-GO test blocks and 6 RC-GO frame columns have been made,and the following three variables have been changed in the design of components:replacement rate of recycled aggregate,go content and go oxygen content.The foundation mechanical property test and seismic performance test of the RC-GO test block are carried out.The main research contents are as follows:(1)The basic mechanical indexes of RC-GO,such as cube compressive strength,axial compressive strength and elastic modulus of each specimen,were measured by relevant mechanical property tests.According to the above experimental data,the effects of aggregate replacement rate,go content and go oxygen content on the mechanical properties of RC-GO are obtained.At the same time,the compression stress-strain relationship of each RC-GO specimen is studied,and the whole curve fitting equation of the compression stress-strain relationship of RC-GO is obtained by fitting calculation.(2)According to the stress form of frame column in practical work,the seismic test component of RC-GO frame column is designed and manufactured,and its seismic performance test is carried out under the action of low cycle reciprocating load.Based on the hysteretic curve,skeleton curve,stiffness degradation and energy dissipation capacity,the seismic performance of RC-GO frame columns is analyzed from the following three parameters: replacement rate of recycled aggregate,go content and go oxygen content.(3)In this paper,based on the obtained theory,using the stress-strain relationship of RC-GO compression and the calculation method of large eccentric compression of ordinary concrete,a correction coefficient is proposed for the calculation formula of large eccentric compression of RC-GO,and the horizontal bearing capacity of RC-GO frame column is calculated by using this coefficient,and the calculation results after the correction coefficient are compared with the code calculation results and test results By comparison,the more accurate parameters of the calculation formula for the horizontal bearing capacity of RC-GO frame columns are obtained.The results show that the seismic performance of RC-GO frame columns is related to the replacement rate of recycled aggregate,go content and go oxygen content.Compared with the specimens with 0.03% go,the seismic performance of the specimens with 0.06% go is better;when the go content is 40%,its seismic performance is significantly better than that of the specimens with 20% oxygen content.In conclusion,the ultimate failure mode of RC-GO frame column is similar to that of ordinary concrete;the addition of go can improve the initial stiffness of RC frame column,and when the replacement rate of aggregate is 50%,the go content in frame column is 0.06%of cement mass and go oxygen content is 40%,the seismic performance of frame column is obviously better than that of RC-GO frame column under other working conditions.Go can greatly change the performance of RC members.Adding go with appropriate content and oxygen content is a way to effectively improve the performance of RC members.