Cracking development and chloride ion penetration of recycled mortar under compression bending load
In order to study the crack development and chloride ion penetration of recycled mortar under compression bending load,one chloride load coupling device was made,which included compression bending loading device and electrically accelerated rapid chloride ion migration device.Through the device,the recycled mortar girder was subjected to compression bending load and chloride ion penetration.In order to avoid the failure of girders under loading,the 25％,50％,75％ultimate axial compression load were applied in the transverse direction of the girders,then the vertical loading was carried out step by step,and the crack evolution law of the recycled mortar girders during loading was studied with digital image correlation(DIC)technology.Four different combinations under compression bending load were designed.Based on RCM theory,the electro-accelerated chloride ion penetration experiments under compression bending load were carried out.The results show that when the transverse load is 25％ultimate axial compression load and the vertical load is loaded step by step,the recycled mortar beam presents the failure characteristics of rare-reinforced beams.When the lateral load is 50％and 75％ultimate axial compressive load and the vertical load is loaded step by step,the recycled mortar beam presents the failure characteristics of the over-reinforced beam.When the replacement rate of recycled aggregate is less than 50％,increasing the compression bending load has little effect on the chloride ion penetration coefficient of the girder.However,when the replacement rate of recycled aggregate is greater than 50％,the chloride ion penetration coefficient of mortar girder increases rapidly with the increase of compression bending load.The chloride ion penetration coefficient of the girder decreases gradually along the vertical height under compression bending load.
recycled mortardigital image correlationcompression bending loadcracking devel-opmentchloride ion penetration
万方数据
维普
