Samomes: tested recipes and mixing features

Portal users share the secrets of how to prepare quality concrete in the mixer with their hands

When you can not order a mixer with the concrete, or you need to set in concrete construction of small volumes, have the support of the concrete-samomes. The only question is, how to cook it? At first glance it seems that there is nothing easier. Take the "popular" ratio of 1: 3: 5. T. e., one part cement and three parts sand five parts gravel, add water "to taste." More plesnom the mixer detergent. After all, everyone is doing it. And... voila, samomesny concrete ready. Do not hurry! Most often, this leads to problems. Foundation, filled with such samomesom, showered the next year. Otmostka crack and burst jumper. To avoid this, read our article, which contains time-tested recipes, samomesa concrete.

Content:

• The proportions of durable concrete samomesnogo
• In what order to throw the ingredients into the mixer samomesa
• How much concrete mixer truck at a time, kneading
• Why it is necessary to vibrate the concrete, not shtykovat
• Can I add concrete household cleaners

Recipes for filling concrete mixers

According to the rules, to prepare quality concrete samomesny need to find emptiness and humidity of sand and gravel, which you brought to the site. Calculate the bulk density and the density of cement grout. Tell me honestly, who will deal with on a real construction site? Especially if you are building a house wage workers. Output - print this article and use it as a cheat sheet in the manufacture of concrete samomesnogo.

angel197238

Builder-samostroyschik

I want to prepare a concrete-samomes. There are concrete mixer 132 l. I want to know the proportions of concrete for pouring the foundation for one batch, so as not to overload the mixer.

Questions answered FORUMHOUSE participants.

Mikhailovmv

I'm doing a pier foundation under the bath. Mixer 130 l. Mixture proportions:

• 2.5 shovels shovels cement brand M500;
• 6 shovels sand;
• 8 burst crushed granite fractions 5-20;
• some water.

When clipped poles on a level, the concrete is hardly powerful bolgarka sawed with a diamond disc, 230 mm diameter.

vehcy

I have concrete poles for the fence. Concrete kneaded as follows:

• 1 M500 cement bucket;
• 2.5 buckets of sand;
• 4 buckets gravel fractions 5-20;
• Less water buckets.

The components of the mixture take in the table below.

Gost1083397

For myself concluded - cement samomes not regret! My ratio:

• 1 part cement;
• 2 parts sand;
• 4 parts of gravel.

 Concrete get so strong that it hardly takes a punch.

Ppopab

In the manufacture of concrete samomesnogo the most important factor - the water-cement ratio! W / C - a weight proportion of cement and water, which are used to prepare a concrete mix. Along with the brand of cement, W / C determines the grade of concrete output. Water-cement ratio for concrete mixtures are shown in the table below.

If you pour the water, you will lose in the strength of the concrete!

Another question was asked by a user with the nickname Serejik1987. He has a concrete mixer 155 l. How to cook it in concrete M200, and how to fill buckets of components for a complete download.

7doom7

If measured in buckets, then the bulb of this volume are advised to fill: 1: 2,8: 4,8, (cement, sand, gravel), but I recommend different proportions - 1: 2: 3. In an extreme case - 1: 2.5: 4. The main thing - do not pour water! The mixture is workable, add a plasticizer.

Ppopab

And I wonder why in a proportion higher to reduce the amount of fillers? What does it give?

7doom7

The complicated crank gravity mixer with a mixture of water cement ratio of less than 0.6. Tough mixture twist mixers of forced action, but they are expensive. That has to specifically choose the proportion with a high content of cement to the outlet to receive a foundation that will not fall apart after a few years.

lipon

And I cook samomes prescription guys who are engaged in manufacturing concrete pools. Proportions of concrete M350, on the granite rubble of fraction 5-20:

• Cement M400 - 20 liters, or 25 kg.
• Sand, washed - 30 liters, or 42 kg.
• Crushed - 50 liters or 67.5 kg.
• Water - 12 liters.
• Superplasticizer - 0.2 liter.

Previously, I poured the foundation in a ratio of 1: 3: 5, would now be done samomes in the proportion of 1.5: 3: 5.

In what order to throw the ingredients into the mixer samomesa

The volume of concrete mixers in lipon - 180 l. Pear it shipped as follows:

• Poured 11 liters of water.
• Then he threw a pear 20 liters of rubble.
• Then, 10 liters of cement.
• Added 20 liters of sand
• Filled 0.2 l plasticizer.
• I threw another 20 liters of crushed stone.
• Now lipon I sleep 10 more liters of sand.

lipon

In the process of mixing a look at the concrete thickness. Add the remaining water from the liter. At the finish Throws 10 liters of rubble. Components sprinkled buckets 10 l.

xiaomi_man

I kneaded concrete into the concrete mixer 160 l. Mixing ratio - 1: 3: 4. Ingredients threw buckets 12 liters. Kneaded as follows:

• 8 liters of water poured into the mixer.
• Said liquid plasticizer in water.
• I emptied all the rubble. He rinsed out with water and de-dusted.
• I slept all cement. Waiting three minutes. changing the inclination angle pears if necessary.
• Sleep 1st and 2nd sand buckets. Waiting. If the mixture is thick, add a little water.
• Pours the third bucket of sand.

W / C mixture 0.6-0.7. Mark concrete M200. When laying xiaomi_man used a vibrator. Crushed fractions 5-20. Yield ready mix 4-4.5 bucket.

Proven concrete structure and algorithm filling ingredients into the mixer shared party FORUMHOUSE 7profy.

7profy

Concrete M250 stamp doing in mixer 180 liters. Concrete composition by weight:

• cement M400 - 16 kg;
• river sand - 32 kg;
• gravel fractions 5-20 - 62 kg;
• water - 8 liters.
• plasticiser - 250 ml.

Now, the same concrete on volume of 8 liter pails:

• of cement - 1.5 buckets;
• sand - 3 bucket;
• rubble - 5 buckets;
• water - 1 bucket;
• plasticizer - 1 measuring cup.

7profy

The ingredients in the mixer I load as follows:

• gravel;
• sand;
• cement;
• water with a plasticizer.

A mixture of pears follows. The output from one batch to obtain 70 liters of concrete. The mixture is stiff. Flooded with vibrators. If gravel and sand very dry, then add 0.5 liters of water. If sand and rubble after a rain, then I subtract 0.5-1.0 liters of water. If the mixture is poured into a mixer, not peppered, then enough water.

Glen

I, after experiments came to the composition: cement bucket 1 + 2 + half a bucket of water bucket river sand + gravel bucket 3 fractions 5- 20 mm. After curing at impact hammer concrete rings. But without plasticizer tough mixture to mix. Be aware of this!

Concrete-samomes: blitz answers to the most common questions users FORUMHOUSE

1. What at first fill in a concrete mixer cement, gravel and sand, and then add water or, in the first grist?

Texet777

It seems to me that the ingredients in the mixer need to interfere in the dry and then pour the water. So it is possible?

Rezus1000

And you try! When such a sequence mixture will lumps and duration of kneading increases greatly. If you start with water, everything happens faster and easier.

lipon

Exactly! If you fill the dry mixture into wet bulb after the first batch, it will stick to the walls and not be diluted with water afterwards. Otkovyrivat have to shovel it.

Remember! Not sypte first into the wet cement from the previous mixing drum.

Borisov

First, pour the water, then add the crushed stone, cement and sand. Watch what happens: the water washes away the rubble dust and dirt. Cement is then crushed and mixed with gravel and water into a homogeneous slurry. Further, all mixed with sand already. With this method of mixing the ingredients is not formed lumps and nepromesy. Only sand is not all at once add, but small portions and make sure that the previous portion of the mix well.

2. How many will give concrete mixer truck at a time?

Sergey M81

I mixer 63 l. How much concrete it is a time to mix and how to ship the components in the bulb?

Igel2126

If you have a mixer with a conventional blower, then it has less than half of the useful volume. Even 30L interfere already uncomfortable.

Borisov

The gravity type concrete mixer, its full range is divided into 3.If the amount of pears halved, the concrete surplus will fall out of the pear.

VasYuliya

Participant FORUMHOUSE

I read in the book "Memo Cement mason" for 1955, such recommendations: "Cement dose by weight, and the remaining part of the volume."At 1 cubic meter of concrete will go:

• 250 kg of cement;
• 160 liters of water;
• 400 liters of sand;
• 880 l of gravel.

concrete output – 65-70% of the useful, and not on the total capacity of the drum. Hence, the concrete output of 0,66-0,67. T. e. with 120 liter mixer, with a useful capacity of 85 liters pears, we obtain 56 liters, but in practice, somewhere 40-45 liters of concrete.

3. Shtykovat or vibrate concrete?

7profy

Shtykovat concrete - a futile exercise. Lil poles and thought do with improvised means. Trailers for punch rod and including the impact mode. No good there. Poshtykoval, a little better, but still not the same. I went out and bought the cheapest vibrator. He poured concrete in the pit, including tools and concrete once gone down and filled the entire volume. I recommend!

Serj

I also poured under the fence poles. The workers say: "We proshtykuem so that the vibrator can not dream!". Good. Dumped into a hole 4 hard concrete buckets. I tell them: "Bayonets!". They fought with concrete until you're blue. Umyali somehow. Swear that the longer the mixture is not compacted. I turned on the vibrator and... zhik, concrete went down. A minute later dumped more half a bucket of concrete into the pit. Since then, work to shtykovaniyu cooled.

conclusions

In this article we touched the main issues related to the concrete-samomesom. Now you can cook it yourself and, taking a proportion of 1: 2: 3 (cement, sand, gravel fractions 5-20) with B / D 0.6 - 0.65 not miscalculate with strength. Finally, another tip from FORUMHOUSE:

Do not add concrete liquid soap and household cleaners! These act as air-entraining additives, making the mixture workable, but lowering the strength of the concrete.

This "popular" method of practice while laying face brick, from where the solution does not require high strength, but it is absolutely not suitable for concrete. To improve the mobility of hardened concrete using plasticizers. They are inexpensive, and you will see the effect immediately and without compromising the quality of the concrete in the long run.

All you need to know about the concrete-samomese gathered in a single theme: Concrete with your hands: the calculation of proportions, reinforcement, formwork.

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In the video - concrete mixtures: Expert answers to the most common questions about concrete.

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