Good afternoon, dear guests and subscribers of the "Build for myself" channel!
At each stage of construction or arrangement of the territory, various situations arise and often there is a need for a small amount of concrete 1-2 cubic meters. m. (construction of a blind area, paths, installation of curbs / curbs, installation of fence posts, etc.) and the question arises of how much more profitable it is to knead the concrete yourself than to buy ready-made ready-mixed concrete for RBU. I will consider the benefit on a small volume equal to one cube.
I take into account the most common concrete - M200.
The proportion and volumetric composition of the components for the preparation of this concrete is as follows: 1 l. cement: 3.2 l. sand: 4.9 l. rubble or mass composition: 1 kg. cement: 3.5 kg. sand: 5.5 kg. rubble.
Based on the proportions, a cube of concrete M200 contains: 230 kg. cement, 800 kg. sand, 1200 kg. rubble. + 150-170 l of water for cement hydration and this mixture weighs about 2.5 tons.
If you have at hand the remains of sand and gravel, then you can go to the store and bring it in your trunk only 5 bags of cement M 500, that is how much is needed to prepare 1 cubic meter of concrete grade M200.
If there is no sand and gravel, then alas, we carry everything in our car, but not in bulk, but in prepackaged bags. Usually, both crushed stone and sand are packed in 40 kg sugar bags. and here we will pay for the bag itself. Therefore, the cost of each component for manual mixing is as follows:
Cement M500 - 5 mesh x 320 rubles. = 1 600 RUB
Sand 800 kg - 20 mesh x 40 rubles. = 800 RUB
Crushed stone 1200 kg - 30 mesh x 60 rubles. = 1800 RUB
If, nevertheless, bulk materials remain unused on the site, then the price will be two or three times cheaper for them. So:
- 1600+800+1800 =RUB 4,200 for a cube of concrete M200 (all components in bags).
- 1600 + (800+1800)/2,5 = 2 640 per cubic meter of concrete M200 (sand and crushed stone from the quarry, brought by a freight vehicle)
Factory price
Now, about the average price of ready-mixed concrete M200 and its delivery. I deduced the arithmetic mean by taking the first 3 plants from a search engine. I downloaded the price lists from the Internet:
So, the average cost of a M200 cube is (2540 + 2950 + 2891) / 3 = 2790 rubles / cubic meter.
Delivery, depending on the distance, will vary from 400 to 1500 rubles. per cubic meter. For the calculation I will take 1000 rubles.
TOTALS tabulated
Conclusion
For the preparation of concrete, it makes absolutely no sense to buy packaged bulk materials, but it is better to order ready-made concrete at the factory. By hand mixing, we will also lose 410 rubles. on the cube, we will spend more time and effort. But, many mixer drivers do not undertake to deliver small batches and then you will have to pay more for delivery than it should be, but even this will be more profitable than kneading with your hands.
Of course, each situation should be considered separately and individually, but in most cases, ready-made concrete is more profitable, because even if manual mixing of small volumes (from 1 to 3 cubic meters), you need to spend time on the delivery of bulk materials and pay extra for labor or donate your time.
Hope it was interesting and helpful. Thanks for attention!
"Why do you need expensive plaster, take a better plaster?" - objected the master (Why is gypsum more practical + 7 ways to slow down hardening)
"Do not make the attic of metal tiles, it rattles from the rain" - they said. Did, tell [my experience]
Why fill a monolithic floor if it will only be harder for grandchildren to demolish this house?