Filler for saw cuts in structural slab.

[Tomfh]

A contractor has made 30mm saw cuts in a new 200mm thick suspended driveway slab which is supported on piers. The slab is on ground, however is piered to rock due to hillside construction. (The surrounding slab on grade driveways have a history of settlement and failure.)

The slab is reinforced top and bottom, and still works, however the cover to top steel is reduced, as is effective thickness.

The slab slope at around 5-10%.

Anyone have experience filling cuts like this? Epoxy? Grout?

 

[Enable]

MasterSeal 350 epoxy mixed with fine aggregate to handle the slope works well for this (EDIT - in small runs. You probably cant do 100LF of sloped terrain). You can have them route the top a bit wider to provide a better funnel if the cuts are too thin to deposit the epoxy. Is the drive going to be covered with a waterproofing? If not, the epoxy will be unsightly and may degrade exposed to UV (you'd have to check with Sika on that front). Nothing comes to mind if you care about the aesthetic of this and it's not waterproofed.

Well, maybe Durabond Uniplast - I've used it to patch & rub up exterior concrete elements exposed to Canadian winters and it works like a charm. BE CAREFUL with the Uniplast though. It hardens almost instantly and near impossible to get off if it runs on to stuff.

Another alternative is a traditional polyurethane crack sealer if the existing slab works as is. This will be no trouble on the slope and provide decent enough protection to the top bars.