Why I chose fiberglass reinforcement for slab-foundation?

Article Reinforcement-slab foundation. Why fiberglass reinforcement? Commentary has been controversial, and there was a small discussion with readers. Once again, I convinced that many did not understand the question of the pros and cons of a fiberglass reinforcement (the SPA) and allegedly expressed his opinion on the basis of stereotypes from the ossified and clumsy in construction technologies builders.

I will describe his opinion on the basis of publicly available information and examples. I'll try to dispel a few myths on account of unfitness Spa in construction. Namely, in the private house building.

Myth 1. Low spa strength.

Here it is necessary to define what is meant by strength? Tensile strength? SPA bypasses the steel reinforcement in the indicator to more than three times (at 360 MPa and 1200 MPa steel - have SPA):

It is for this reason we can replace steel bars SPA smaller diameter with the same design characteristics of the concrete structure.

But there is another figure: the flexural strength and the associated modulus. This is when you bend rebar rod and see what effort you have to make it bend.

Indicators: 200 thousand. MPa at a steel and around 55 thousand. MPa at the spa. Here are losing composites. It is for this reason, they write that the spa is not recommended for use in beams and plates of overlaps, as well as in columns and piles. But then again, it is not recommended to do it without qualitative calculations.

Even if you perform them, such structures SPA may not replace the steel with the benefit of the characteristics of the carrier element capacity and price.

But I could be wrong on this. My logic is this: the modulus of elasticity in the spa is lower than that of steel, it flexes easily, thus the beam will bend and crack. But on the other hand, because longitudinal stretching ratio in SPA less at times, it will not allow the beam to bend. Deflection of the beam depends on the longitudinal extension of armature segments, for which clings to the concrete. And then it can be used in the joists. The comments written in Japanese SPA is used for more than 20 years.

But slab foundation and many tape - it's not the beam. In them it is appropriate to use the spa. There's no such bending deformation of the whole structure in the ceilings. There are present deformation that locally break the concrete. Due to the fact that the spa hardly stretches and elongation in her order of magnitude lower than that of steel - it can be used in the base-plates:

Myth 2. Short lifespan spa.

One of the latest comments in my article about the reinforcement says that the SPA in the concrete can quickly break down and may even evaporate resin from its structure. Look at the life of high-quality plastic, even in harsh conditions of the annual changes in temperature. For example, a car bumper. So, in the SPA polymer resins do not live less. They do not react with the alkaline environment of concrete during its curing. Do not corrode over time as the steel reinforcement:

The moisture may enter the microcracks and cause local corrosion. Iron oxides are increasing in size, break the concrete and in it there are still large cracks. Destroyed marine and river piers bridges steel reinforcement, especially at low stamp concrete. The foundation of a private house is in constant contact with wet ground, hygroscopic it is not always with the desired characteristics. Aging process valves in the underground part can go faster than we think.

In any case, it claimed the life of spa - not less than 80 years. And in fact, more than the average lifetime of the house. As many say - by the time the house at least morally obsolete and demolished.

Myth 3. The lack of savings in the use of the spa.

Spa is sold in coils. Steel reinforcement for the foundation you need to bring in a whip. 1900 meters Spa for your foundation I have brought at a time in the cabin of the car (station wagon).

For my-slab foundation would need to use about 2 tons of steel bars of 12 mm diameter - almost 80 thousand. rub. 5 thousand plus shipping. rub. Cost Spa - 28100 rubles. The savings is obvious.

Myth 4. Spa is almost never used, there is no experience and examples.

As said in the beginning, do not use the spa due to ossified attitudes and lack of information at the expense of the properties and performance spa.

At sites where the screed is poured industrial floors of various shops and warehouses - you can save a lot of Stoney thousand rubles on only one object.

Reinforcement of wharf and piers.

Reinforcement plates of foundations

Examples can be continued. If the spa is not used, then where are selling these products by more than 20 plants in Russia?

Myth 5. With Spa uncomfortable work

From my experience I would say that it is inconvenient unwinding of the bays. But the video how to do it with the help of two boards - led here

Cut easily. Someone uses bolt cutter, I cut off the grinder, and when you do not want and need to get it was to saw off 1-2 rod, the conventional hacksaw.

SPA easy, drag and drop it easily. Knit - too. If you need a place to lift the corner of the grid, then do it in a grid SPA easier.

Due to the fact that the structure of the SPA may extend fiberglass yarn, then this fixture can make some many invisible splinters. We must work in the rubberized gloves, or be itchy hands. But without gloves work on any construction site - hands are not protected. This is a required element of working clothes.

SPA can not be used in the reinforcement of masonry in the corners or in the corners of the strip foundation. Because it does not retain deformation straightens back after the bend. Here it is necessary to use steel.

Well, in conclusion, I suggest you watch this short video on the topic of properties Spa:

Let again write that I do advertising. I advertise material that gave their preference and used at this stage of construction. This is my question and the visibility of the topic. Someone may disagree with this, but someone categorically not. Just let them do it convincingly.

Read more: Pouring concrete ribbon on top of the foundation plate,

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Photos taken from the service Yandex. Pictures.

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