Cement question

[wantacoe]

For some strange reason whoever built my building (50 years ago) put cement to the inside of the post in my doorway, So the threshold was not on the cement. I need to cement about 6"x6"x36". 2 questions, What is the best to put under it (gravel, sand etc?) Since this will be a separate piece how can I anchor it to the floor to keep it from shifting? Thanks

 

[whateg01]

They did that so water doesn't run in under the door. You should do the same, keeping your threshold a 1/2" or so below the floor.

Somebody else can suggest how to go about it.

 

[KenC]

To keep it from moving, drill into the edge of the existing floor for some 3/8" rebar pins, 4" deep is enough. Use some Sika (or equivalent ) anchor adhesive to tie them in. Tie a couple pieces of the same rebar to those pins, running lengthwise of the new pour. Form and pour. I'd drop the new piece a little below the floor and/or slope to the outside.

 

[Zeke]

I think I'd work a railroad tie a bit to look nice and bury it right where you need. Later, if you decide to put in a threshold and door seal, just screw it down. I'd probably set the tie down in a bed of mortar a couple inches thick. You can seal the tie to the 'concrete' inside the poles.

 

[Kurt4440]

For some strange reason whoever built my building (50 years ago) put cement to the inside of the post in my doorway, So the threshold was not on the cement. I need to cement about 6"x6"x36". 2 questions, What is the best to put under it (gravel, sand etc?) Since this will be a separate piece how can I anchor it to the floor to keep it from shifting? Thanks

Pictures always help us help you better.
Answers:
1. Gravel will work.
2. Install Tapcon screws into the concrete and leave them sticking out about 2". Clean up the concrete dust and the concrete you are bonding to. Apply a concrete bonding agent to the concrete. Attach a piece of wire mesh to the Tapcon screws with wire ties.

Use about a 4" slump concrete and be sure to consolidate it.

 

[wantacoe]

I will get pics today when I go out there. Does concrete bonding additive really work?

 

[Monza Harry]

Re bar is now at my HD in green epoxy, an excellent idea/upgrade. To anchor the rebar there are many options, I've used PL Premium and mortar also the anchor holes should be splayed for additional holding power clean the holes thouroghly . Lots of excellent suggestions above cherry picking parts of each is also a possibility. Harry