Study on axial compression performance of expanded perlite based phase change concrete columns
The mechanical properties of phase change material(PCM)are different from those of ordinary concrete because of the strength of PCM and its adsorbent.In this paper,the axial compression performance of PCM and its application are studied.The axial compression performance experiments are carried out on 8 PCM columns based on expanded perlite(EP),and the effects of the content of PCM aggregate and the volume stirring ratio on the failure mode,load-strain curve and axial compression capacity of PCM columns are studied.The results show that the failure forms of the EP based PCM columns are the same as those of ordinary concrete columns.The load-strain curves of the specimens are further analyzed,and the results show that the ultimate bearing capacity and ductility of the PCM columns decrease with the increase of the PCM aggregate content,and increase with the increase of the volume stirrup ratio.Based on the above results,the bearing capacity of specimens is predicted by the relevant formulas in the specification,and the calcu-lation formula of ultimate bearing capacity is established based on the constraint effect and superposition principle,and the error of the two formulas is compared.
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