Casting concrete joint between asphalt and paving stone

[Kneppe]

Hello,

We have a walkway of paving stones/concrete stones that ends in the middle of an asphalt area. Between the end of the walkway and the asphalt edge, there's a 4-5 cm gap currently filled with fine fraction crushed stone.

To stabilize the gap and reduce the need for weeding, I thought about digging out the crushed stone and filling the gap with concrete.

But I've never poured more than a footing with concrete before, so I have a few questions:

1. There are so many different types of products, cement, quick-set concrete, dry concrete... what is most suitable to fill a gap? (The area under the crushed stone is hardened, I planned to build frames with wood + vegetable oil on the sides of the walkway to hold the pouring in place)

2. I was thinking of digging about 8-10 cm to fill with cement, is it necessary or even appropriate to use rebar?

3. Is this even a good idea? Will it just crack or look ugly? Better suggestions for filling the gap?

Best regards, Kneppe

 

[lunnabo]

Bad idea to pour with concrete as there is a high risk of it cracking even if you use reinforcement. Concrete does not tolerate much movement without cracking. Instead, fill with asphalt which tolerates movement significantly better.

 

[AXS]

Can't you lay a row of cobblestones instead? You can set them in concrete to make it steady.

 

[Workingclasshero]

Dig carefully so you don't undermine the edges.
I have successfully used a knife and industrial vacuum cleaner to avoid softening the edges.

Good luck.
/W

 

[lunnabo]

Can't you lay a row of cobblestones instead? You can set them in concrete to make it sturdy.

I would argue that it's not better at all to set them in concrete. There is a risk that the concrete cracks and loosens, so it's better to set them in crushed stone, for example 0-8mm, and pound them down properly. Large cobblestones never even have the slightest tendency to pop up by themselves...

 

[AXS]

I would argue that it's not at all better to place them in concrete. Risk of the concrete cracking and breaking, so it's better to set them in crushed gravel like 0-8mm and pound them down properly. Cobblestones never even have the slightest tendency to pop up by themselves...

But 4cm is thin, I see a risk that it will bend without support. I also saw that it was how the professionals did it at my place.

It will certainly work excellently with crushed gravel; I'm completely sure that lunnabo has more experience than me.

 

[lunnabo]

View attachment 560555 View attachment 560555Cut asphalt edge with the cheapest angle grinder and diamond blade for 79 kr at Jula. Laid large cobblestones in crushed stone layers and finished with a 450 kg compactor. Will never move, either upward, downward, or sideways.