What gravel/crushed stone should you use when mixing concrete?
I don't know what kind of house you're planning to build, but we have cast a 110-meter foundation wall in 8-meter sections with the recipe I sent you. I'm not the least bit worried that our foundation wall won't hold up. We're building with lightweight concrete and clay tiles. So just go for it, it will hold, are you using two 12mm reinforcement bars along the footing?
Three, they are visible in the construction drawing in the first post as the green rectangle at the bottom of the image. (That's what I'm going to cast now.) On that footing, there will then be a wall to compensate for the sloping ground, and then the slab will rest on that wall.X xLnT said:
Ok, thank you very much for all the input! Slowly gathering my courage. 
Tomorrow I'll start, and considering what I happen to have at home, the starting point will be this recipe:
25 L makadam 8-16
50 L gjutsand
25 kg (≈ 17L) cement
14 L water
Tomorrow I'll start, and considering what I happen to have at home, the starting point will be this recipe:
25 L makadam 8-16
50 L gjutsand
25 kg (≈ 17L) cement
14 L water
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Very interesting to see, thank you! What an advanced drawing you had, lots of insulation here and there... :-oX xLnT said:
In addition to the neighbor's garage, we also have a row of L-elements that are 40 cm from the neighbor's garage, and I thought they could remain under our garage. It has been incredibly tricky to dig out between them, and the footing and drainage/insulation are somewhat affected by that... But still easier than moving them, and they've stood steadily there since 1974, so they can definitely stay, I think.
The recipe depends on what strength you need. Either you calculate it, or you mix it so that it becomes strong enough...Andreas Lundgren said:
Yes, I know it will be fine, but I simply can't sleep when you have about the same amount of sand and macadam, and someone else has 3:2, byggmax has 2:1, etc. There must be a recipe that is best, arghhh!
The recipe I've used for everything at home (my post from another thread):
I read a bit in a concrete book that is about as old as I am, where it stated that you take 90 liters of stone, 85 liters of gravel to 25kg of cement. I personally adjusted the recipe a bit to fit the size of my drum (15 liters). For simplicity, it's 1 drum of cement, 2 drums of 0-8 gravel, and 2 drums of 8-16. It took about 7-8 liters of water for this. 15 liters of cement is roughly half a 25kg sack. This was also just the right amount to mix in my small Jula mixer. This becomes a quality mix suitable for retaining walls, plinths, and other nuisances you are forced to cast on the plot.
I read a bit in a concrete book that is about as old as I am, where it stated that you take 90 liters of stone, 85 liters of gravel to 25kg of cement. I personally adjusted the recipe a bit to fit the size of my drum (15 liters). For simplicity, it's 1 drum of cement, 2 drums of 0-8 gravel, and 2 drums of 8-16. It took about 7-8 liters of water for this. 15 liters of cement is roughly half a 25kg sack. This was also just the right amount to mix in my small Jula mixer. This becomes a quality mix suitable for retaining walls, plinths, and other nuisances you are forced to cast on the plot.
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That will be fine. Good luck! Remember to vibbra. If you don't have access to the real stuff, an old thicker machine screw, bolt, or iron or something in the chuck of the rotary hammer works. Just place it against the edge of the form and run it on chiseling mode (without rotation).
Did you really manage to bring home all the sand + gravel in two trips with an unbraked trailer? I would have secured a little extra and also extra cement. It's rarely exactly as you calculated...
I have the same thought as you, often many calculate based on the volume that is on the trailer, very often it's too little.B larry78 said:
A basic rule is to multiply by 0.7 (30% more air when the material is no longer compact), by which I mean sand.
A heavily loaded trailer, unbraked, 0.6 m3 sand, contains only 0.42 m3 when it's finished mixing.
Regards, P-A
Hehe, no, I pulled 500 kg on the trailer, order and discipline!
We have a quarry in Södra Sandby where I live, so it's close and convenient. Then I ordered 2 tons of casting sand that came by tipper truck because it's quite a drive to the nearest sand place.
In hindsight, I might have skipped the sand and just gone with the crushed stone available here in the village; I will definitely do that if I need to cast and minimize sensitive parts in the future, like pillars and such.
So I have 2 tons of sand, 1 ton of macadam (8-16), and 500 kg of cement at my disposal.
It seems like all these materials have approximately a 1.5 weight/volume ratio, so I should get about 2 cubic meters. I need 1.5 cubic meters. The results will come tonight if I have time!
https://www.aqua-calc.com/mobile/calculate/weight-to-volume/substance/cement-coma-and-blank-portland
We have a quarry in Södra Sandby where I live, so it's close and convenient. Then I ordered 2 tons of casting sand that came by tipper truck because it's quite a drive to the nearest sand place.
In hindsight, I might have skipped the sand and just gone with the crushed stone available here in the village; I will definitely do that if I need to cast and minimize sensitive parts in the future, like pillars and such.
So I have 2 tons of sand, 1 ton of macadam (8-16), and 500 kg of cement at my disposal.
It seems like all these materials have approximately a 1.5 weight/volume ratio, so I should get about 2 cubic meters. I need 1.5 cubic meters.
The results will come tonight if I have time!https://www.aqua-calc.com/mobile/calculate/weight-to-volume/substance/cement-coma-and-blank-portland
A beginner's question on that, what is "en rulle"?MathiasS said: