Trowel burns are caused by hard-troweling a surface so stiff that the trowel angle can be very high without causing chatter marks. Tilting the trowel increases pressure on the trowel edge and this densifies concrete at the surface.Click to see full answer. Likewise, what does it mean to burn concrete?When you burnish, you’re making the surface slick and very smooth, as well as altering the color. “The term burnishing, in essence, means burning the finish. Trowel machining colored concrete is a careful process.Beside above, why do you trowel concrete? Trowel the surface Floating removes the marks left by edging and brings the surface one step closer to a final finish. You may have to bear down on the float if the concrete is starting to harden. You’ll be surprised that with enough scrubbing you’ll be able to bring a slurry to the surface of even a fairly hard slab. Besides, what is a hard trowel finish? Hard troweling is a process by which a finisher uses a steel trowel to densify the surface of the concrete. This finish is optional and produces a hard, smooth surface. Repeated passes of steel troweling will result in a burnished finish, which has a mirror-like appearance.What is the best thing to put on a concrete burn? First aid treatments for concrete burns include: Remove wet clothing and shoes. Brush away concrete specks and flush the burned skin with water or water with vinegar or citrus juice. Flush eyes for 20 minutes with plain water and refer the patient to an ophthalmologist. Apply aloe vera to the burn site.