Wilfred Xavier Pickles wrote:
So I tried to single-handedly replace a slab of sidewalk last week.
Near killed my po' self, mixing and pouring, etc. Was so worried
about thunderstorms etc, I forgot to cut/set the expansion joints.
Forced 'em in as the 'crete was being finished. They stick up
as much as an inch above slab-level.

How do you cut this stuff? It is Quikrete 1/2 In. x 4 In. x 5 Ft.
Expansion Joint per Homey-Flogging-Depot:

http://www.homedepot.com/h_d1/N-5yc1...atalogId=10053

Sez it is made from resilient cane fiber. Looks like cardboard
soaked in asphalt gunk. Tried cutting with utility knife, it sorta
shreds.

Best case would be if I could pull 'em out without making a hideous
mess. Then I could cut some wood joints to replace 'em. But they
don't seem to wanna come out.

Mea Culpa: I blew this part of the job. Any help much appreciated.

A sharp thin bladed knife or even a handheld hacksaw blade should do it. If
using the knife, you could just slice into both sides, then bend it back and
forth to break it off. Then clean up the edge with a sharp 1/2" wood chisel.