Fibrofor High Grade und Fibrofor Standard: 1 kg / m3
Fibrofor Diamond: 2 – 3 kg / m3
Concrix: 2 – 7.5 kg / m3
Fibrofor Multi: 900 g / m3
|Application||Concrix ES||Concrix HS 35||Fibrofor High Grade||Fibrofor Diamond||Fibrofor Standard||Fibrofor Multi|
|low and medium loads||x||x||x|
|Water impermeable concretes||x||x||x|
|Fire resistant concretes||x|
|Estriche / Unterlagsböden||x||x|
|Putze, Stukkaturen, Gips||x|
Flexural strength, shrinkage characteristics, frost-thaw-salt resistance, sulphate resistance, impact resistance, wear resistance, water absorption, fire resistance.
Yes, it does; the consistency of the concrete is reduced. This means the concrete becomes stiffer and, depending on its use, has to be optimised with concrete plasticiser or liquefier (avoid the addition of more water).
An accurate finishing according to national standards and regulations is a must despite the use of Brugg Contec fibers. This process is crucial for a satisfying result and is not influenced by adding fibers.
According to EN 14889-2 the difference between micro and macro fibers lies in their diameter. The defined limiting diameter is given as 0.3 mm. Furthermore the addition of micro fibers has a positive effect in particular on the shrinkage behavior of concrete, and depending on the construction and composition of the fibers, also on its flexural strength. On the other hand the addition of macro fibers leads to a significant increase in the post-cracking tensile strength and can thus be regarded and used as a fully adequate substitution for steel fibers.
Fiber concretes are manufactured according to EN 206 specification and contain a specified quantity of synthetic macro fibers in order to obtain a post-cracking tensile strength. The interaction results in a ductile and macroscopically isotropic composite building material in which the technical properties are enhanced. Concrix-Macrofibers are mixed in quantities of 2 to 9 kg/m3, without adversely affecting the processability. Synthetic fibers affect the shrinkage behavior of concrete in a positive way. The fibers control and bridge cracks in concrete and result in a specific level of post-cracking tensile strength. In addition the fibers prevent macro cracks from occurring.
The very high number of fibers per kg (100,000 /kg) ensure a dense network of Concrix-Macrofibers. MRI pictures of test samples have this confirmed. Provided that the mixing have been done well, areas without fibers (which can happen by using steel fibers with low dosage) can be avoided.
Yes! Concrix-Macrofibers can be added without any problem to self-compacting concrete. Thanks to the specific surface structure, the processability is still possible even after addition of large quantities, by controlling the fine materials and the liquefier content.
Yes! The addition of Concrix, particularly if larger amounts are added, will make the concrete stiffer. At additions of 3-4.5 kg/m3 the consistency of the concrete must be reduced by a class. This is adjusted by controlling the liquefier content. The addition of more water is fundamentally prohibited!
Yes! Concrix fiber concrete can be pumped even at high addition levels. The flow properties of the concrete are only marginally affected. The protection of the equipment should also be emphasized here. The flexible Concrix fibers cause significantly less wear and tear on pumps and hoses than with steel fiber concrete. This lengthens the lifetime of the hoses and pumps considerably and results in cost benefits for the company involved.
In concrete technology balling is referred to as the appearance of aggregated fibers that have interlocked into the shape of a ball. These balls can block the concrete pump and lead to its damage. Incorporated balls can also lead to the formation of individual cracks in the concrete due to the defects. Usually a similar picture is found when cutting open such balls. The fibers become solidified due to penetration of fine concrete particles and can no longer be separated. This effect can only be prevented by observing the correct procedure when adding the fibers or by ensuring the basic consistency of the concrete. A faulty procedure can be largely excluded if the appropriate leaflets for adding Concrix in the concrete factory and the truck mixer are taken into consideration.
The macro fiber content can practically only be determined in fresh concrete. At least 10 liters of concrete are necessary for washing out the macro fibers. The low specific weight of the synthetic fibers allows them to be skimmed off the surface of the water, then after drying they are weighed and thus the added quantity approximately determined. In hardened concrete it is practically impossible to determine to amount of fiber metered, since breaking and crushing the concrete sample also damage the fibers and thus they can no longer be reliably measured. The absence of the reflecting property in the synthetic material means that X-ray techniques also cannot be used. Optical testing can only be carried out using an expensive MRI instrument and subsequent data analysis.
When cracks form there is a partial loss of load capacity which can be compensated by Concrix fibers for non load-bearing applications and temporary construction measures and thus they can replace the use of traditional reinforcement. However for operation in load-bearing applications, the required full ductility of concrete cannot be attained by fibers. Depending on the application, the combination of synthetic fibers with reduced conventional reinforcement can considerably reduce costs.
Of course Concrix fiber concrete can also be used in outside areas. The utilization of synthetic fiber concrete is a straightforward choice for this area of application, since the unpleasant property of corrosion can be excluded for synthetic fibers, which in the case of steel fiber concrete can be found regularly in outside areas. Besides the optical defect from corroded steel fibers close to the surface, the risk of injury and/or damage arising from protruding fibers in connection with increasing abrasion of worked-out steel fibers can be excluded when using synthetic fiber concrete.
In order to compile a structural analysis for an industrial floor, information is required concerning the base, the intended loads, the exposure of the floor and geometric information about the concrete slab. Support is available from our data acquisition sheet (www.bruggcontec.com). The base can be characterized in different ways. There is a choice of the following procedures: Westergaard modulus, Ev1- and Ev2- values, and the k-value stiffness modulus method. The most common information concerning the foundation soil comes from the Ev1- and Ev2- values, which consist of measurement results from the first and second loading.be regarded and used as a fully adequate substitution for steel fibers.
The degree of compaction of the foundations is of crucial importance for the final result of an industrial floor. It must be ensured that the compaction is not too variable, in order to exclude differential settling. Subsequent settling or major deformations in the substrate inevitably lead to the formation of cracks due to incalculable additional stresses in the concrete floor. Visible grooves in the flat surface are clear indications of an inadequately compacted substrate. Indications for such deficiencies are longitudinal cracks in the driving lanes and crack formation in the middle of the area between joints.
In the case of jointless floors, attention must be paid to edge stresses occurring due to increased shrinkage stresses. Steel joint profiles along the outermost edges and partial edge reinforcement should be included. A further decisive factor is the concrete formulation, which must consist of a suitable type of cement, an appropriate cement dosage and a tailored water-binder ratio. The addition of monofilament micro fibers (type Fibrofor Multi) can be used to effectively assist optimal shrinkage behavior. The joint pattern should be reasonable and concreting sections should be taken into consideration. Finally, however, the standardized after-treatment of the surface also contributes to the success of the construction.
Contraction or dummy joints should take place as soon as possible after the concrete has hardened. This moment is directly dependent on the construction temperature and the construction consistency of the concrete. In the summer the waiting period tends to be shorter than in winter. As a rule this period is between 12 and 24 hours following construction. Experienced contractors can reliably recognize the right time.
Due to the large surface area in 2-dimensional slabs such as industrial floors, there is an enormous potential for evaporation of water at the concrete surface. Thus it is absolutely necessary to limit the evaporation to a minimum. Spraying on of evaporation protection or covering with plastic sheeting or a moist textile, which has to be kept constantly damp, is required for this purpose. Loss of surface concrete mixing water leads to the formation of cracks and to curling of the slab edges. Another result of inadequate after-treatment is the so-called spider-web cracks, which give rise to cracks on the surface, as the name suggests, in the form of spider webs.