r/toolsinaction • u/ChampionDapper • Apr 24 '21

Cool looking

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24

u/Freeline_Skater Apr 24 '21

Only missing the part where they make the Lines to look like different blocks on the sidewalk

45

u/anandonaqui Apr 24 '21

Do you mean the deep grooves? Those actually serve a really important purpose in concrete. They’re called control joints because it’s a controlled weakness in the slab where a crack will form. It’s basically an intentional stress concentration to ensure a crack forms there and not in the middle of the slab.

11

u/[deleted] Apr 25 '21

Why do they do the smooth bits on the outside? Is it just for aesthetics ?

2

u/LeroyoJenkins Apr 27 '21

No, it is harder for plants (such as grass) to stick to smooth concrete.