Does Concrete Need To Be Vibrated?

[@NordicDan]

I'm planning to build a large (15' x 15' x 18" tall) concrete garden bed (pouring in place) and know very little about working with concrete so been trying to learn as much as I can before I dive in. Only recently had I heard of vibrating concrete and this video explains it perfectly. Well done.

[@freightgod]

Great. Now I want a cup of coffee.

[@creatingconcrete]

GREAT idea. Me too!

[@C4J72]

I thought I was the only one drinking endless amounts of caffeine while working

[@chriskeeble]

Club. I'm. In it.

[@1abomb1]

Hey, love the videos I enjoy watching all your experiments. I'm a roofer and interested to know how flexible mortars are made. I don't know if America uses it so much for Roof pointing but here in New Zealand and Australia it is used alot...have you made any videos on this or would you dive into that for a video?

[@creatingconcrete]

I do not have any videos for this. As for as flex goes the high quality thin set tile mortars do allow for some movement, which is achieved through heavy additions of polymers and monomers to the mix design as admixtures. But this still looks and feels like "regular" concrete/mortar. It is not like a urethane rubber or anything. I feel like you might be talking about something which has more elasticity to it than a modified thin set product.

[@1abomb1]

@@creatingconcrete You are right, the flexible pointing is heavily modified with polymers is my understanding. I tried a heavy mix of pva, basically no water and it still cracked easily. The flexible pointing bends alot then when it cracks it doesn't exactly snap if you know what I mean. My next guess is sbr or acrylic paint polymers?

[@creatingconcrete]

@@1abomb1 definitely PVA is not the right admixture to create what you are looking for. This is polymer modified concrete. Start with existing products and read the MSDS sheets to see which chemicals are included in the product including rough amounts.

[@sharonglazier2552]

I have a problem, first of all I had my basement walls sprayed with foam insulation which stopped the humidity coming through the walls. All good. My problem is when they poured the floor part of the basement they put NO foam insulation or plastic (older home) and now I have humidity not water coming in through the floor. what can i do to solve this problem, I live in Northern Canada Products are limited. Would a floor sealer then paint work. If it"s just painted, the paint keeps peeling off and making a mess. Please Help.

[@creatingconcrete]

You need a waterproofing system which can resist hydrostatic pressure. Basecrete makes such a product but I am unsure if this would work in your situation. I have seen basement paints which also claim to resist hydrostatic pressure to a small degree, which should work in theory if this is just moisture wicking and not actual ground water pushing up through the slab.

[@sharonglazier2552]

@@creatingconcrete Thank You very much.

[@margerykirner5604]

Does concrete expand and contract? Thank you

[@creatingconcrete]

Yes, concrete expands and contracts more than you would think. A 100' slab of concrete will expand over 1/2" over 100 degree temperature F differential. This is why expansion joints need to exist for structures adjacent to concrete slabs.

[@gyffjogofl7676]

I drink a lot of coffee ☕️

[@chriskeeble]

Coffee......... 😛

[@punkeasy]

Sh177y cringe intro!