Decorative fence blocks cast on "Washed Concrete" technology

In September of 2018. After pouring the foundation and blind area around it, he began experiments on the casting products for sampling. The plan was to use elements:

- Matched pole-blocks;

- fence blocks with voids;

- cover the pillars and fence.

That would not spend money on the purchase of the factory molds for casting typesetting blocks, decided to make them from the remnants of 18mm laminated plywood. Those. is free. Try out, and see what happens. It turned four forms size: 25x30 cm (Art School) and a height of 20 cm.

The shape after repeated use. Long disassembled by unscrewing screws. Yes, for a long time they will not be enough, but it is possible Drill holes in the other place and do it more than once. Or fasten something like "fasteners", the type of those which cover the side of lorries. Then their accurate enough for a couple of fences.

As an inside core first used concreted section of the sewer plastic pipe:

But the pipe was taken out with great difficulty. Sometimes she even had to knock. I save the paper, which obvorachival pipe.

A few refused fills these pipes and began to use plastic bottle 5L, filled with water. Before untwist shape, overturned block and merged into the water bucket. Blocks hard, but lifting. After that, the bottle can be easily removed, gently crushing. Filling it with water again - straightened.

As an inside core use also the internal formwork. These blocks will be needed for a couple of poles, where the metal tube 3-5 cm off center.

The process of stripping. The outer shape is removed, proceed to disassemble the internal.

If the external form, I had missed the mark layer of concrete setting retarder, the internal I just obvorachival stretch film.

What would retarder concrete remained on the vertical surface of the layer necessary - it should be transformed into a gel-like substance. Here, too, I experimented. I was looking for the cheapest and most optimal way. Even tried to plant polyacrylamide (used in water treatment). But it turns into a piece of jelly and does not give a uniform solution. He stopped on a regular wholemeal glue.

Minus one - can not be stored for long periods such gel, fermentation begins adhesive thickener. Or need to add preservatives, such as borax. But I did not want to do. When on stream, the gel does not stagnate for a long time. Apply and give to dry for 15-20 minutes. In hot weather, it dries quickly.

When filling forms, concrete vibrating pokers. Though there is a vibrating table, but because in forms no bottom, they just stand on a board made of laminated plywood. In addition, with the vibration table it is very difficult to be rearranged on the ground.

So, what happened?

The first cast inlaid pillars. Dissatisfied with their views. Well, firstly, they cracked at dislodging inside core (they even used the 150x150 mm beam), wrapped with stretch film. And he made too thick upper facet (in the subsequent replacement in the form of a bar on 10h10mm). concrete composition was not optimal - lurks gray concrete, a little gravel in the bottom of the element. And the second was not in the picture provibrirovan. Optimum concrete composition: 4 buckets of gravel and sand 2.

Next - better:

For the remainder of the warm autumn of 2018. molded blocks 35. The first four will not use. This amount is obtained on the three pillars. We need another 90 pieces.

Not laundered place on concrete blocks - is bound column typesetting frame connection intaking unit.

Surface closeup. The weather is cloudy and the camera does not convey how they look alive. Especially, the blocks are not varnished with the effect of "wet stone". Soaked with water looks much better.

For the casting of the intake unit has acquired just such a form of plastic:

Appearance after repeated use. Good shape, strong plastic, does not bend. For chamfering also I used the bar 10h10mm - laid on the bottom along the bottom edge.

Three plastic bottles filled with water are used as the inside core. There are two extremes of 1,5l and 2l center. The side faces are not washed clean, too, because will come into contact with the adjacent blocks through the thin layer of solution. Or rather, in these places, I do not greased mold surface retarder.

Quality is not to "5". I will improve. Laid into the masonry will be in such a position as pictured. Gray surface appearance, because were efflorescence. You can grind grinder with an attachment and in masonry stone varnish.

These are the main products that I am planning to make a fence. Another form of purchased for taking cover. Make a test fill, but failed. Still flooded gutters and facade tiles. These products show the following article.

Read more: Other products, molded me for "Washed concrete" technology

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