Group

Leader: Druhv

Materials Needed

Crushed gravel (¾-inch minus or dense-grade aggregate)
Premixed concrete bags
Water and a mixing tub or portable mixer
Wheelbarrow and shovel
Hand tamper or plate compactor
Sturdy wooden board (screed board)
Mason’s trowel Instructions
Clean the Hole: Remove all loose dirt, old broken concrete, and debris from the cavity.
Dry the Area: Clear out any standing water so the subgrade is stable.
Add Gravel Base: Pour 4 to 6 inches of crushed gravel into the bottom of the hole.
Compact the Gravel: Pack the gravel down tight with a hand tamper to stop future shifting.
Mix the Concrete: Stir your concrete mix with clean water in a tub until it looks like thick oatmeal.
Pour the Concrete: Dump the wet concrete over the packed gravel bed.
Spread and Level: Push the concrete into all corners and smooth the top flat with your shovel.
Screed the Surface: Slide a wooden board back and forth across the top to match the height of the old floor.
Smooth and Finish: Use a trowel to make the top smooth and clean.
Cure the Concrete: Keep the surface damp for a few days so it gets as hard as possible.

What You Need

Hammer and cold chisel
Wire brush and shop vacuum
Concrete bonding adhesive
Quick-setting cement or vinyl concrete patch mix (such as Quikrete Quick-Setting Cement)
Scrap plywood and weights/cinder blocks for a form
Trowel, margin trowel, and edging tool
Spray bottle or damp sponge

Step 1: Prep and Clean the Area

Chip away all loose, soft, or crumbling concrete using your hammer and chisel.
Undercut the edges of the hole so the inner part is slightly wider than the surface opening, which locks the patch in place.
Scrub away all dust and loose particles with a wire brush and vacuum the area completely. Step 2: Set Up and Prime
Drill anchor holes and insert masonry screws if you are repairing a large broken corner or deep edge.
Saturate the repair zone with water so the old dry concrete does not suck moisture out of your new mix, but wipe away standing puddles (Saturated Surface Dry condition).
Paint a liberal layer of concrete bonding adhesive over the exposed old concrete. Step 3: Build a Form and Apply the Mix
Clamp or brace a piece of oiled scrap wood against the step face to act as a mold for missing edges or corners.
Mix your quick-setting cement with water until it has a heavy, moldable consistency.
Press the material firmly into all corners and crevices with a trowel to eliminate air pockets.
Screed the surface flat and use an edging tool to recreate rounded step profiles. Step 4: Cure and Finish
Smooth the final surface gently using a moist sponge.
Carefully remove the wood form after the material sets (usually 20 to 30 minutes for quick-setting mixes), and smooth any rough transition marks.
Keep the patch damp by misting it with water or covering it with plastic sheeting for at least 48 hours.

Also repair the mosaic: there should be white subway tile in the epsilon closet

Back hallway grinding and resealing

Maybe can get away with a good scrubing. Might need grinding.