Reinforcement and casting of lintels from glued U-blocks made of aerated concrete [many photos]

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How do I make U-blocks from aerated concrete for pouring window and door lintels

Installation and insulation of jumpers from homemade U-blocks made of aerated concrete [many photos]

Before purchasing the fittings, I made an armature bender. There was an article about its production here.

Delivered fittings: diameter 14 and 16 mm - for lintels. 10 mm - for an armored belt. And 6 mm (smooth) - for bending frames.

On a homemade machine, I bent the required number of frames for frames based on their installation every 20 cm.

I cut a bundle of knitting wire in half with a grinder. The hook was purchased for tying reinforcement on the foundation.

Because it often rained, then we had to work in a concrete workshop-greenhouse. Forms for typesetting posts came in handy here (as supports). The joint of the wire within the framework must be alternated so that it goes along more than one reinforcement.

Knitting of a three-meter reinforced cage

To pour high-quality concrete in the lintels, concrete on crushed rubble with ragged edges is needed. I had an ASG of river gravel and sand. But I thought that ASG as a filler in concrete for lintels is not suitable.

I purchased 3 m3 of crushed stone. The cost is 4100 rubles. with delivery. The type of crushed stone, ASG and sand for comparison on the next slides.

Placed the first reinforcing frame in the lintel. I did not remove the fill.

I put concrete supports under the reinforcement, which I had previously cast into molds from packing eggs. I wrote about it here.

The process of pouring other straps. On average, 10 buckets of concrete took 2 m of the lintel. The concrete was mixed in a proportion of 1 hour of cement, 2 hours of sand and 2 hours of crushed stone. Plus an incomplete bucket of water (depending on the moisture content of the sand).

As a plasticizer, I added an additive to concrete to increase its strength from the Polyplast company. The result was amazing this time too. The concrete is self-compacting.

When compacted, the concrete pushes excess water to the surface and it seems that the concrete was too liquid. Although this is not so - it interfered with it very thick.

Well, it is impossible to fill in the lintels without vibrating the concrete. To do this, I used a deep vibrator (I purchased it for pouring the foundation and vibrating the molds in the production of “washed concrete” blocks for the fence).

At the end of the work, he poured the remains of concrete into molds. I do not recommend throwing it away. In a separate article I will write where it will come in handy.

The poured lintels must be covered so that the concrete does not lose moisture. The next day the concrete of the poured lintels was already very strong. The addition to concrete really increases its strength due to better compaction of the mass.

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Photos of the author (c)

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