Rushawn | Civil Engineer
Region: US
Saturday 28 June 2025 18:10:58 GMT
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Rino_🦏 :
I would just do a keyway. (idk what a keyway is, i read it in the comments)
2025-06-29 08:30:09
924
Engineer. Francis🦺🦺🪖 :
For proper bonding between the old concrete and the new one. the smooth surface doesn't help in bonding the concrete together hence the rough surface being created
2025-06-28 18:23:18
8225
Wiseman8675309 :
because you get paid by the hour and as long as he hears the drill, you get paid.
2025-06-29 04:06:08
7183
Alexandre Braga :
Ill never be convinced this prevents more friction than a standard 4” x whatever key way will… engineers just like being able to say they invented a new means to things
2025-06-29 01:44:47
3
danilo89 :
better use also bonding agents...cold joints sealants also necessary..
2025-06-29 21:12:07
17
O.Trujillo :
People in the comments have never sanded something plastic so that the spray paint holds on better and it shows.
2025-06-29 16:38:43
18
buttery flakey crust :
this is the equivalent to sanding when painting. so it adheres. same, same but different
2025-06-29 18:38:24
17
Maison.D ☕️ :
At a cold joint the concrete is not going to "bond" like a glue. Keyways (or the very DIY version here) create a mechanical link that helps prevent movement and shear between the two. Like legos connecting together
2025-06-29 16:48:45
16
Chill Factor291 :
Better adhesion
2025-06-30 01:31:36
14
D1m1._.1 :
it's to connect the new pour to the old one by scratching up the surface but its basically useless becouse the metal beams will hold it together anyways
2025-06-30 06:20:08
18
talentedoccasionally :
To warm it up!
2025-06-29 17:25:32
13
Dave Loughney :
2 x 6 wrapped in plastic 45 the edges
2025-06-29 13:28:38
12
Essential Trade Wear :
To give the labours something to do for 8 hours a day 😂
2025-06-30 00:41:04
12
stevebriere516 :
So the cement has a rough surface To Bond better
2025-06-29 18:37:03
21
J Pablo :
because some guy a long time ago did but noone questioned why, so now we keep doing it not knowing why
2025-06-29 18:01:56
14
C3AMC :
it's to create more surface area for the new mud to adhere to
2025-06-29 23:27:02
14
Fergy1111 :
Because you get paid by the hour
2025-06-30 00:03:54
13
yep :
super bond
2025-06-29 15:13:36
13
Peter Pierre :
To make it warm 😂😂😂. I just had to
2025-06-30 08:41:43
12
Butch Arnold 🐝 :
bonding
2025-06-30 01:12:10
12
user1796872554847 :
It effectively increases the surface area across the face of the joint
2025-06-29 07:38:09
21
TLawlor64 :
adhesion
2025-06-29 18:42:27
12
charliebowler1 :
scrabbling increase surface area and makes joint stronger
2025-07-11 06:09:50
12
Victor Rivas :
I’m guessing pegwall effect better bond
2025-06-29 20:19:10
12
Jye g :
so they concrete can bond to the joint easier
2025-06-30 09:11:01
12
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