Yes, the 13th, 14th, 15th amendments were reforms: but the South was able to resist them, the North eventually willing to let them resist.

It would be easier to think clearly about Reconstruction if you stopped trying to fit it into concepts like revolution and reform. Both of those terms imply a change from within. Reconstruction was a change from outside: the North imposed a change on the slave society of the South, which strongly resisted. Initially, by extending the vote to the freedmen and taking it away from Confederate soldiers, the North was able to displace the White governing elite. But eventually those Confederates regained the vote, the White elite regained power. Southern resistance partially succeeded; slavery was abolished, but the freedmen and their descendants would not gain full civil rights there for another hundred years.