In order to study the mechanical properties of gangue-based concrete under axial compres-sion with different cement replacement rates and different water-binder ratios,so as to promote the ap-plication of gangue-based concrete as a green building material,the uniaxial compression test and a-coustic emission test were carried out.The stress-strain curves,acoustic emission ringing counts and a-coustic emission cumulative energy of gangue-based concrete with different coal gangue powder content and different water-binder ratio under axial compression were examined.The variation law of coal gangue powder content and water-binder ratios,and the constitutive relationship of gangue-based con-crete under axial compression was proposed.The results show that compared with ordinary concrete,the mechanical properties of gangue-based concrete have been improved to a certain extent,mainly due to the increase of peak stress and peak strain.The stress-strain curve of gangue-based concrete under axi-al compression is basically the same as that of ordinary concrete,and the peak stress reaches the maxi-mum when the content of coal gangue powder is 20％.The acoustic emission ringing counts can effec-tively exhibit the damage evolution law of gangue-based concrete.With the increase of the replacement rate of coal gangue powder,the ringing count decreases first and then increases.Considering the influ-ence of coal gangue powder and water-binder ratio on the axial compression of gangue-based concrete,a high-precision constitutive relationship of gangue-based concrete under axial compression is deter-mined,which provides a reference for the further study of the mechanical properties of gangue-based concrete,and also has a certain guiding value for the structural calculation when it has an increasing application.
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