In order to investigate the impact of concrete strength and whether the stirrups are cut off on the static crushing effect of columns

eight concrete columns with different strength grades were drilled at the top of the columns along the column height and injected with static crushing agent slurry

and the stirrups were cut off at the side of the holes for four specimens. The sum of the average width of the cracks was used to indicate the crushing effect of the specimens. Test results show that the crushing effect of the specimens decreased with the increase in concrete strength. For the specimens without cutting off stirrups

the decreasing range of the static crushing effect increased with the increase in concrete strength. For the specimens with the stirrups cut off

the decreasing range of the static crushing effect decreased with the increase in concrete strength. Under the conditions that the column section

reinforcement

pore-forming

and static crushing agent slurry injection were all the same

cutting off stirrups could effectively improve the static crushing effect. However

with the increase in concrete strength

the impact of cutting off stirrups on the improvement of the crushing effect decreased gradually. Specimens without cutting off stirrups had densely distributed cracks

and no blocks fell off during the static crushing process

while after removing the protective layer

the inside of the specimens was crumbly; for the specimens with the stirrups cut off

blocks fell off at the corners of the column during the static crushing process.