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Hi @Taleya,
A good approach for infill would be to first fill the majority of the gap depth with mortar. Since your pavers are around 6–7cm thick, using mortar to bring the infill up to around 5mm below the surface of the pavers will make it easier to pack out the area without using excessive amounts of finer material. Once the mortar has cured, you can then use a tile grout to fill the final 5mm and achieve a finer, more finished look between the pavers.
Grouting this top layer works much like tiling — just be sure to wipe off any excess grout from the surface of the pavers before it dries completely, using a small amount of water and a scrubbing brush or scourer. This two-step method not only saves on grout but also gives you a cleaner, more durable finish.
Here's a helpful guide: How to lay crazy paving.
Please let me know if you have any questions.
Mitchell
Are you bedding these chunks of concrete into a mortar base @Taleya? Typically, you would lay a 40-50mm bed of mortar and place your concrete on it while it is still wet. Once dry, the pavers will be locked into position. The grout is then used to fill the voids between them, helping to lock them together, rather than being the sole structural support. The mortar bed is what keeps them in place, rather than the grout, as its primary job is to fill the aesthetic gaps between the concrete.
Exterior tile grout is designed for use in exposed outdoor applications and should withstand heavy traffic well. It's used on all outdoor tiling projects, whether for patios, balconies, or walkways. The only thing stronger than a standard tiling grout would be an epoxy version, though these can be trickier to apply as cleanup is less forgiving.
If it's a bit of a rustic crazy paving path, you could choose to infill and grout with a mortar or cement, though these are more commonly used for bedding paving rather than grouting between them. My preference would be to use cement instead of mortar, as mortar is fairly sandy and rough.
My suggestion would be to use Dunlop 15kg Mid Grey Wide Joint Grout as it's specifically designed for outdoor crazy paving. In saying that, though, the pavers/concrete must be well supported on compacted ground and a layer of mortar for it to work effectively and not crack.
Mitchell
That could work @Taleya. My only concern would be your ability to compact that material between the chunks. Without being able to compact it sufficiently, the chunks might move over time. I would suggest adding the crusher dust in 20mm layers and watering it in well between them.
Mitchell
