/ DIY concrete laying advice
I need to lay a small patch of concrete slab to finish off a repair to a drain in my back garden.
My issue is that the weather has taken a turn for the worse and the temp has dropped to the point that I'm worrying about frost messing up all my hard work.
Does anyone know a what temperature I should consider using a frost proofer additive? if these additives are compatible with other plasticiser/waterproofing additives? and if these additives have any major drawbacks?
The patch in question is a sheltered spot next to the house that will only get light foot traffic and I was looking to do a slab of ~2-3inches deep. The weather forecast predicts it to be ~6 degrees in the day dropping to 1 at night.
I was seriously considering using an old blanket and a hot water bottle.
Who's talking about chickens?
Use a frost proofer, don't use any other additives the frost proofer will act as a feb. you shouldn't need to plasticise for general concrete use. I've rendered full house's in colder weather.
Sounds sensible I guess, I'll have a look at what I can get hold of.
Do it early in the morning and insulate with hesian/carpet/polystyrene as suggested you should be ok at those temperatures even without frost proofer. Use warm water in the mix. If possible store the ballast and sand in doors overnight.
You need enough water for the chemical reaction, which will generate a little heat itself, so don't make it too dry. A basic slump test is a way to tell if you are about to add too much water, i.e. make a little column of wet concrete if it slumps it is too wet!
The other alternative is extra rapid cement. Which goes off in about 30mins. Though you can't add any additives to rapid cement. Rapid cement is about twice the price but for a small area it doesn't matter much.
if you did your concrete you shouldn`t have had to bother with frostproofer.
1 degree celsius overnight is nothing to worry about.
-5 and I `d be concerned.
dont like adding anything extra to my concrete .
I like me concrete to be 'organic'
bit of mix ,cement (4-1) and water.then mix thouroughly until you have a nice creamy ,perky mix .
Paul Hollywood eat your heart out..
If you have no reason to rush, just wait. Concrete below 2 or 3 degrees will be inferior.
Are you sure about the thickness? If it's only 2", even with light foot traffic, it needs a good compacted sub-base.
(I run one of the largest consumers of cement in the UK. Don't rush it and make it thicker than you think necessary. Feel free to ignore though!)
I've been trying to finish off building my bridge, need to lay a thin skim of cement to level all the foundations and put the bridge struts on. I've postponed it for a week now and waiting for the weather to turn milder. It's only a short job but I don't want to risk messing the whole thing for the sake of waiting a few more days, and I'm like you - novice concrete mixer!
Very frustrating but think I shall hang on and wait for milder conditions, it is very cold here at night.
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