FHU “POL-KRUSZ” Zbigniew Wojno offers a wide portfolio of normal weight concrete mixes, special concretes and other mixtures with cement binder. Since many years we have been systematically following the needs of our clients as well as trends in shaping modern buildings and structures as so materials used to build them. We are constantly adapting and expanding the range of our offer. We make sure that our products meet the stringent requirements of reference standards and the specifications of our most demanding customers.
Concrete mix designed for making structural elements in various types of buildings and structures. It is a basic building material offering ease of shaping and fast construction rate. We produce this concrete based on proven mix designs adapted to environmental exposure classes and individual customer specifications. The source of high quality and durability of our structural concrete are carefully selected raw materials used for production and continuous laboratory supervision carried out as part of factory production control. We offer our structural concrete in strength classes from C16/20 to C60/75, in all consistency classes (including self-compacting concretes) and in all environmental exposure classes specified by the contracting party.
Non-structural concrete (lean concrete)
A concrete mix designed as a levelling screed footing foundations’ subbase or other structures directly on the ground. It is also often used as a base substructure for concrete pavements. The implementation of underlay concrete is intended to protect the reinforcement of the structure against soiling from the excavation, arranging the cut-off or sliding layers. Our non-structural concrete is offered in strength classes from C8/10 to C12/15, consistency classes S1 to S4 and exposure class X0.
Concrete mixes intended for making indoor floors (not exposed to outdoor conditions) finished in DST, WTW technology or floated. A specially designed mix of gravels and appropriately selected binders and chemical admixtures guarantee a low w/c ratio and thereby an increase in durability, quality and significant shrinkage reduction. Flooring concretes are often modified by adding:
– steel fibers increasing the flexural / tensile strength of concrete,
– polymer macrofibres increasing the flexural / tensile strength of concrete,
– polypropylene microfibres reducing plastic shrinkage.
Properly designed concretes modified with fibers allow to perform seamless floors and / or large joint-less fields which significantly increase using comfort of objects. Our flooring concrete is offered in strength classes from C20/25 to C35/45, consistency classes S3 to S4 and in all environmental exposure classes specified by contracting party.
Bridge quality concrete
Concrete mixes dedicated to constructing engineering structures exposed to the aggressive environmental impact during operation. Most often these are road and railway construction objects (bridges, over-bridges, over-ground and underpasses transitions, etc.). We design these concretes taking into account special durability requirements, such as frost/thaw resistance in the conditions of access deicing agents, water permeability and low-water absorption. Due to the aggressive environment, for the production of this type of concrete, we most often use special low-alkaline cements with high sulphates resistance. Frost/thaw resistance, a key parameter in local weather conditions, is obtained by proper air content in the concrete mix, low w/c ratio and the use of frost-resistant aggregates from igneous and metamorphic rocks, including granite, basalt, granodiorite, amphibolite, gabbro or gneiss. Our bridge concrete is offered in strength classes from C25/30 to C50/60, consistency classes from S2 to S4, frost/thaw resistance from F100 to F200, watertightness from W8 to W12, water absorption below 5% and in all exposure classes related to the environmental impact specified by the customer.
Pavement quality concrete
Concrete for pavements exposed to aggressive weather conditions and abrasion from vehicle traffic during operation. Road surfaces are most often performed in the consistency classes S1 by using a special paving machines, in a double-layer technology with a wearing course made of concrete with exposed aggregate. Another form of mix are concretes made in the consistency classes S2 or S3 in a permanent formwork laid directly from the concrete truck mixer and compacted with immersion and surface vibrators . Surfaces of this type are most often carried out in industrial areas (internal roads and maneuvering areas). Regardless of the placement method, when designing pavement quality concrete we take into account special durability requirements, such as frost/thaw resistance with de-icing agents and tensile splitting and flexural strength of the concrete. Due to the aggressive environment, we most often use special low-alkaline cements with high sulphates resistance. Frost/thaw resistance, a key parameter in local weather conditions, is obtained by proper air content in the concrete mix , low w/c ratio and the use of frost resistant aggregates from igneous and metamorphic rocks, including granite, basalt, granodiorite, amphibolite, gabbro or gneiss. Our pavement quality concrete is offered in strength classes from C30/37 to C35/45, consistency classes from S1 to S4, frost/thaw resistance from F100 to F200, cyclic frost/thaw resistance with de-icing agents from FT0 to FT2, water absorption below 5 % and in all exposure classes related to the environmental impact specified by the customer.
Concrete mix intended for deep foundations including piles, diaphragm walls and underwater construction elements. The major aim in tremie concreting is to place the mix in its final position with as little disturbance as possible. Properly designed tremie mix is placed and compacted by gravity without requiring any vibrations. Concrete mixture should be characterized by proper level of viscosity enabling the right balance between fluidity, passing ability and resistance to segregation. Resistance to segregation is crucial while concreting in bentonite slurry to minimize risk of concrete contamination. Preparing concrete mix design we pay special attention to the appropriate content of silty fractions in sand and aggregates as well as properly selected hydraulic binders and admixtures. The use of pebble aggregates positively affects the rheology of the mix and prevents it from being wedged, which would make difficult inserting reinforcement cage.
Tremie concretes are offered in strength classes from C20/25 to C35/45, consistency classes from S4 to S5, water tightness from W8 to W12 and in all environmental exposure classes specified by the customer.
Concrete dedicated to massive reinforced concrete elements in which the exclusion of thermal stress cracking is essential. Typical examples of such elements are massive ground slabs in industrial structures and housing and non-housing buildings. Designing the concrete dedicated to the massive reinforced concrete structures, we use fine–graded aggregates and binders (mix of cements and type II additives) that guarantee the lowest possible heat release while bonding and hardening concrete. We use low heat cement and the A category fly ashes. Also properly selected plasticizers and superplasticizers with retarding effect are crucial. A strong aggregate skeleton and low heat hydration binders support concrete with minimal settlement, low cracking risk and slow compressive strength development.
We offer our mass concrete in strength classes from C25/30 to C35/45, consistency classes from S2 to S4 and in all exposure classes related to the environmental impact specified by the customer.
White box technology concrete
The white box technology is the method to obtain water-tight reinforced concrete box. Properly selected concrete mix and sealing system elements which joint the walls with the ground slab allow to achieve full tightness of the structure. This type of solution is used with high level of groundwater, its substantial variation in the annual cycle and / or horizontal water filtration above the foundation level.
Designing our mixes for the implementation of the white box we pay special attention to the water-tightness of concrete ( resistance to the penetration of water under pressure). We obtain it by proper selection of the binders (cement and type II additives) and high quality gravels or crashed aggregates. Concrete mixes are modified with appropriately selected plasticizers and superplasticizers. Such approach results in high tightness of the cement matrix and its accurate adhesion to aggregate skeleton. As a result, we significantly reduce the risk of water filtration in the contact zone between cement matrix and aggregate skeleton. At the customer request we can offer admixtures or special additives with cracks and scratches sealing effect (appearing as result of thermal deformation or for example irregular settlement of the building).
Our white box concrete is offered in strength classes from C25/30 to C35/45, consistency classes from S2 to S4, water tightness from W8 to W12 and in all environmental exposure classes specified by the customer.
Self-compacting concrete (SCC)
The self-compacting concrete is used to make reinforced concrete elements in which complicated geometric shapes and / or densely distributed reinforcement make it impossible to use immersion or attachable vibrators.
Our SCC mixes are designed taking into account the distribution of reinforcement bars in the element, which is crucial for proper selection of the aggregate composition. A properly designed mix eliminates the risk of the aggregate hanging on the reinforcing bars, which could lead to its segregation. Properly chosen binders (cements and type II additives) and modification with plasticizer and superplasticizer admixtures allow to gain liquid concrete mixes tightly filling the formwork. Appropriate viscosity of the mixture improves its segregation resistance and supports air volume reduction and compaction under its own weight.
Our SCC is offered in strength classes from C30/37 to C50/60, consistency classes from SF1 to SF3, water-tightness from W8 to W12 and in all environmental exposure classes specified by the customer.
Concrete dedicated for light duty applications such as parking lots and low traffic access roads. It is also used as drainage layers for grassy surfaces (natural and artificial). Can be applied for sport surfaces finished with polyurethanes floors. The key element to pervious concrete is its porous structure. It is obtained by discontinuous graining of the used coarse aggregate composition, which results in void content and permeability to water and air. Pervious concrete is beneficial to eliminate or significantly reduce the costs of drainage installations required for large paved areas.
Our pervious concrete consists mainly of coarse aggregate (usually without or with slightly addition of sand). The aggregate grains in combination with cement paste form a porous structure. Properly selected chemical admixtures guarantee adhesion of cement paste to coarse aggregate, preventing from its runoff and clogging of pores structure.
Our pervious concrete is offered in strength classes from C8/10 to C16/20 and guaranteed water permeability above 80 liters/minute/m2
Concrete introducing expansive features (increasing volume when pouring). It can be applied both as construction and non-construction (filling) purposes concrete. It is useful for:
– exchanging of existing spread foundations
– making concrete bedding dedicated for machine and constructions fixed with screws
– filling the structure made of prefabricated elements
– clogging up of pipelines, sewers and ducts or other underground infrastructure
– making tight ballast filling of existing structures
– filling steelwork structures made of box profile elements to protect against corrosion
Our expansive concretes are designed to meet specific requirements resulting from the pouring method (pumping or unloading directly from truck mixer), strength and durability parameters of hardened concrete and the size of filled spaces.
Expansion effect (volume increase) of the concrete is obtained by using a special admixture, which mixed with cement paste results in the formation of hydrogen micro bubbles. Depending on the admixture dosage, it is possible to get different results – from limiting the natural shrinkage up to the volume increase by several percent.
Our expansive concrete is offered in strength classes from C16/20 to C30/37, consistency classes from S3 to S5 and in all environmental exposure classes specified by the customer.
Presented table contains the basic requirements for the offered concrete mixes in accordance to PN-EN 206 + A1: 2016-12 with the national supplement PN-B-06265: 2018-10. It also includes requirements specified by customers in accordance to PN-88 / B06250 (watertightness, water absorbability).
|Compressive strength classes||C8/10||Concrete mixes for non-structural purposes|
|C16/20||Concrete mixes for structural purposes|
|Concrete consistency classes by slump test||S1||slump 10 – 40 mm|
|S2||slump 50 – 90 mm|
|S3||slump 100 – 150 mm|
|S4||slump 160 – 210 mm|
|S5||slump ≥ 220 mm|
|Concrete consistency classes by flow table test||F1||flow diameter ≤ 340 mm|
|F2||flow diameter from 350 to 410 mm|
|F3||flow diameter from 420 to 480 mm|
|F4||flow diameter from 490 to 550 mm|
|F5||flow diameter from 560 to 620 mm|
|F6||flow diameter ≥ 630 mm|
|Concrete consistency classes by slump-flow test (dedicated to SCC)||SF1||slump-flow diameter from 550 to 650 mm|
|SF2||lump-flow diameter from 660 to 750 mm|
|SF3||slump-flow diameter from 760 to 850 mm|
|Exposure classes related to environment actions||X0||no risk of corrosion or attack|
|XC1, XC2, XC3, XC4||corrosion inducted by carbonatiation|
|XD1, XD2, XD3||corrosion inducted by chlorides other than from sea water|
|XS1, XS2, XS3||corrosion inducted by chlorides from sea water|
|XF1,XF2, XF3, XF4||freeze/thaw attack with or without de-icing agents|
|XA1, XA2, XA3||chemical attack|
|XM1, XM2, XM3||abrasion attack|
|Declared value of D of the coarest fraction of aggregates used in concrete||Dmax=8 mm|
|Watertightness – hardened concrete ability to withstand water penetration under pressure (according to PN-88/B-06250)||no requirements|
|Water absorption – the water mass absorbed by concrete submerged in water under the atmospheric pressure in a compared to dry concrete mix mass (according to PN-88/B-06250)||≤9%||for concrete protected from weather conditions|
|≤5%||for concrete directly exposed to weather conditions|
|≤4%||for concrete directly exposed to weather conditions and de-icing agents|
|Frost/thaw attack resistance level (according to PN-B-06265:2018-10)||F25|
|Resistance level of frost/thaw attack with de-icing agents (according to PN-B-06265:2018-10)||FT0|
At the clients’ request, we can also perform tests and declare other parameters of fresh and hardened concrete , including:
– consistency determination by the Vebe method or the compactability degree method
– determination of the viscosity classes , passing classes and sieve segregation resistance classes of self-compacting concrete
– tensile splitting strength and flexural strength of the concrete
Cement mortars of common use (G) are dedicated for connecting mural elements in walls covered from external influences and under the construction principles. Mortars can be used in traditional bricklayer’s work like building walls, poles and partition walls made of ceramic, sand-lime and concrete elements.
The key to our cement mortar quality are neatly selected materials like cements, additions, admixtures, and rinsed quartz sand. We use special admixtures with complex function that guarantee long time of keeping its work properties, high grade of vividness and fine grip of our mortar.
Cement mortar should be used in keeping bricklayer’s technology principles. Mortar is dedicated for making joints of thickness from 6 to 40 mm.
We offer our cement mortars in durability grades of M5, M10, M15 and M20. Typical time of keeping mortar’s properties is ≥36 hours.
Foundations, ballasts, stabilizations
Mixes bound with cement
Mixes bound with cement (CBGM) compatible with notes of GDDKiA included in WT5 2010 and in required norms PN-EN 14227-1:2013 are mixes bound hydraulically and are used in road constructions. It is made by mixing cement with specially selected aggregate and sand with suitable granulation. It is used for making construction layers of pavements that are stiff and vulnerable in road structures with traffic category from KR1 to KR6. Depending on durability and granulation the following mix can be used as enchanted ground area and foundations.
Mixes compatible with PN-S-96012 are dedicated for foundations or layers of enhanced ground used in road construction. Stabilizations can be used in making construction layers of road structures with traffic category from KR1 to KR6. We produce stabilizations in our concrete plants by precisely mixing cements, sands and aggregates. The constant measurement of granulation and humidity of our feedstocks allow us to make homogenous mixes with stable properties.
We offer our cement stabilizations in durability classes of Rm=1,5 Mpa; Rm=2,5 Mpa and Rm=5,0 Mpa, on aggregates of granulation 0-2 mm, 0-8 mm or 0-16 mm. For our cement and aggregate mixes we declaring frost resistance indicator of ≥0,6 or ≥0,7.