Before comparing both materials, it is necessary to take into account that the fiberglass( the same "composite") armature is a filament of fiberglass, fastened together by an epoxy resin. Such a "core" has a surface coating of polymers, and the role of "ribs"( incisions) is played by a coating of quartz. This explains many properties of the product, for some of which it undoubtedly favorably differs from metal fittings.
Features of composite fittings
On various sites, you can find many examples in which, based on various calculations, the properties of the two types of reinforcement are compared. We will not quote specific figures, since we consider this to be incorrect, especially considering the huge range of products. Therefore, all the data given below are only indicative, averaged.
In addition, it is clear that virtually all articles on the reinforcement of fiberglass are either initiated by the Manufacturers, or compiled by their own employees. Consequently, they can not claim full objectivity.
Strength of
When manufacturers consider such a parameter, it is reported that in the case of a composite rod it is almost 4 times larger. But for some reason our attention is always focused on "stretching".It is clear that any plastic is much more elastic than metal. But what about the strength of compression and bending? But this is an important indicator of the durability of any concrete structure.
Reliability of the
design It is ensured, among other things, by the high-quality coupling of materials. In this regard, plastic loses metal. Specialists point out that when there are defects in a cracks in concrete with a "composite" there can be much more, and often it just crumbles into pieces.
Economical application »fiberglass
This is undeniable. Here it is worthwhile to dwell on several points.
Firstly , the convenience of transportation. If you need a truck to transport metal bars( considering their standard length), composite products can be taken away either in a car or, for example, "Gazelles"( depending on the volume of the purchase), as it is sold in bays.
Secondly, , hence the advantage of reducing the cost of shipping to the place of use.
Thirdly, , the cost of a rod made of fiberglass is approximately 2 times lower than that of a metal rod.
As one of the arguments in favor of composite reinforcement Manufacturers cite the fact that using it can use samples with a cross section smaller than that of metal products. But all the calculations proposed for attention only mean a tensile strength. Therefore, this advantage is somewhat doubtful.
For some parameters of composite fittings it is possible to put a fat "PLUS" without additional comments:
- resistance to corrosion;
- does not conduct electricity / current. It is advisable to use it where it is necessary to use dielectrics;
- light weight;
- is inert to most aggressive chemicals / compounds;
- flexibility;
- does not interfere with the operation of radio electronic devices( unlike metallic analogs), since it is "transparent" to electromagnetic waves.
Disadvantages of composite fittings
As such products from fiberglass are a relatively new material in construction, at the moment there is practically no regulatory base( requirements for installation, its methods, etc.) for its application. In principle, there are certain recommendations of the manufacturers, but again, how objective are they?
Firstly, the , they are somewhat different, because there are differences( sometimes significant) in the technology of manufacturing materials.
Secondly, , they are not official regulatory documents, since all conclusions are based only on the results of various experiments, and conducted by specialists of this enterprise. In case of negative consequences, it will be necessary to try very hard to defend one's rightness, especially( if it comes to this) - in courts.
Despite the fact that all manufacturers give different arguments that emphasize the advantages of using their composite products, they are the same in one: the glass reinforcement should not be used in structural components subject to significant bending loads( for example, beams, slabs).
The complexity of installation. For example, can each of them qualitatively fasten the rods together? After all, in this case, welding is not applied. This is one of the main "minuses" of composite products.
Based on the foregoing, such an armature can be safely used when covering a base with a plaster composition( reinforcing carcass arrangement).There are no special requirements for installation. If it is used for the construction of concrete structures, do not blindly trust the advertisement. This is the case when you need a professional consultation, and "independent", disinterested in sales.
The fact is that there are some differences in the properties of concrete( its ingredients) and fiberglass. As such a "neighborhood" will manifest itself in certain conditions( temperature jumps, earth displacements, etc.), no one can definitely answer. And accurate calculations can not be made due to the lack of relevant regulatory documents.
Conclusion
Composite fittings in private housing construction are advisable to use only in individual cases or as an auxiliary framework, fibers and so on. It can not completely replace the bars from the metal. Given its features, it is better to use this material when constructing non-residential objects. For example, various auxiliary buildings on the site, strengthening the shore of the reservoir.
Those who want to learn more about the specific application of fiberglass reinforcement, additional information can be found in SNiP from 2003, No. 52-01.Although there are mostly general rules.
