How to make a chemical anchor or experience versus technology

Modern construction provides for new wall materials, which are much superior in their characteristics to traditional bricks. Their main advantage is high heat retention rates due to porosity, because air is the best heat insulator. But these building materials have one common drawback: they are very poorly load-bearing. That is, hanging a more or less heavy shelf on a wall made of such a brick is not only problematic, but also dangerous because traditional anchors, metal or plastic, simply fall out along with the piece walls. And this means that the shelf may one day, one not at all beautiful day, collapse on your head along with the pots, or whatever else you may have in stock. The prospect would be bleak if there were no alternative - the so-called chemical anchor. This is a compound that can be poured into a hole drilled in the wall, and a metal stud can be fixed in it. How to make a chemical anchor and which composition is most suitable, the author of the YouTube channel told Stroyhak.

Read in the article

1 Legends of deep antiquity, or the grandfather's method
2 General method of planting a chemical anchor
3 What can the Knauf mix
4 Ceresit glue as a chemical anchor
5 Cement, sand and PVA: what happens
6 Epoxy resin: what it means tightly
7 When history teaches us nothing

Legends of deep antiquity, or the grandfather's method

Let's start with the old-fashioned method. The repeated statement that experience is the son of difficult mistakes leads us to believe that technology, that existed decades ago will still be the best in comparison with the newest developments. After all, the fact is that the clay mixed with a chicken egg has held the stones of ancient buildings to this day. Why not listen to the experience of the masters of the last century? And he says that the most durable chemical anchor is a mixture of drying oil and cement. This method of fastening was used for 40-50 years, no less, and even your grandmother will say that a nail planted in such a mixture will hold her favorite tapestry with deer for another 30 years.

But let's check the different types chemical anchors strength and make independent conclusions.

General method of planting a chemical anchor

Any fasteners must be correctly seated. Everything depends on the skill of the master, this is a fact. So even if you use the winner in this ranking, but do it wrong, the result will be zero. So what does it mean to plant a chemical anchor correctly?

How to make a chemical anchor — A regular anchor is held in the wall due to a special shape, expansion, which fixes the fasteners

For drilling, conventional drills are most often used. But drills for metal are more effective. This is a fact proven by practice.

To produce a hole for a chemical anchor, a conventional drill with a washer is used. That is, they pass the drill through the washer and first make a hole, and then, rotating the drill, they work out the inner part, making it larger for filling. The device shown in the photo makes the workout more perfect.

You can see the effectiveness of such a device in comparison: on the right ─ the resulting cone, if you fill it, the result will be the most reliable

The key to the strength of a chemical anchor is its good adhesion to the main wall material. And for this you need to carefully remove all the dust from the hole.

The traditional way is to use a syringe to blow everything out.

And the simplest and most convenient option is a regular vacuum cleaner with a tube attachment that will clean any hole

If you need to hang something on the wall, choose a threaded pin - you just need to cut it to the desired length

Even if you use a chemical anchor, you cannot do without a regular plastic one. You will need to cut off part of the anchor in order to neatly fix the stud in the wall.

This part of the plastic anchor is screwed onto the stud. The fasteners are now ready for experiment.

In addition to the fasteners and holes, you will need to prepare a tube to fill the cavity.

To completely fill the cavity, it is better to attach a long spout to the tube.

So, the preparation algorithm is as follows: first you need to make a tapered hole, then clean it of dust and then fill it with a chemical composition through a long tube using a tube

What can the Knauf mix

Ready mixes are very popular due to their ease of preparation.

Knauf is a popular mix that is easy to prepare and can be used as a chemical anchor

When using any composition that uses water in the mixing process, it is important to moisten the cavity in the wall so that the wall material does not draw out moisture and interfere with the normal formation of the mixture.

When the cavity is filled with the compound, you can place a hairpin in it and leave it to dry completely.

Wrapping the hairpin with wire is considered a very effective technique. It increases the contact area and makes the connection especially reliable.

After two days of waiting until the mixture has completely solidified, tests have shown that the peak load on such an anchor is 150 kg. And if you use a wound wire, then the figure will be twice as high - about 300 kg!

Ceresit glue as a chemical anchor

The second variant of the test is very logical: the Tserezit tile adhesive acts as a test mixture.

This glue is also sold in a ready-made composition, which just needs to be diluted with plain water.

The principle of filling is the same: preliminary wetting with water is required.

Oddly enough, Ceresit glue has worse performance than Knauf plaster: only 130 kg

Cement, sand and PVA: what happens

The traditional proportions of one to three sand and cement for PVA applications are considered ideal for chemical anchors.

PVA gives the mixture plasticity and high adhesion

With a load of 143 kg, the stud jumps out of the wall. These are the abilities of this mixture

Epoxy resin: what it means tightly

Another test mixture is regular epoxy, or epoxy adhesive, which is less expensive.

Add regular sand to the resin. It will increase the amount of mix and save you material without losing quality

The result of the work of this mixture is 365 kg of load! This is the best result possible, and after such a load, the test block simply cracked entirely, leaving the anchor in the cavity. This is the best possible option.

When history teaches us nothing

And how will the "old-fashioned" mixture of cement and drying oil behave?

Such an anchor succumbed to the usual manual effort. This is a sad fact, but nevertheless, you should take this into account when making a decision.

Everything is cognized in comparison, and this experience is another confirmation of this. Chemical anchor is an effective fastening method that can help you out if the walls are made of aerated concrete or similar material. In addition to this material, ─ here is a video tour of the practice of using chemical anchors in aerated concrete:

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