Concrete mixes of class B20 and higher are used for the construction of vertical structures, such as columns, pylons, walls, retaining walls. Such structures generally require an increased surface roughness class as these structures ensure the durability of the building, strength and endurance of the structure, and its seismic resistance. Choosing the right concrete mix type alone is not enough to construct a structure capable of with standing significant vertical dynamic loads. It is also very important to adhere to the following construction processes: Preparation of high-quality formwork, use of professional lubricants, ensuring homogeneity and uniform density of concrete by vibro compaction. Vibration compaction permits to bleed the excess water, densely place concrete in the structure form work and expel the entrapped air. When compacting a concrete mix, the vibrator tip should penetrate into the previous layer. Once the concrete has hardened to 70-80% of its design strength, the formwork can be removed. Formwork shall be removed carefully to avoid damage both to the formwork and concrete structures.
Usually, construction engineers select the concrete class most suitable for your construction project themselves. However, if you still have any questions, our managers are ready to provide personal professional advice on choosing the concrete mix to suit your exact needs and your budget. And our highly qualified laboratory technicians will select the raw materials and develop a tailor-made mix recipe for applications of any complexity level. We guarantee the high quality of our concrete mixes for vertical structures and compliance with all relevant requirements and standards, plus delivery to your construction site.
The concrete grade is designated by an alphanumeric code (for example, M-100),which denotes the ultimate compressive strength expressed in kilograms per square centimetre. A higher value means a greater amount of cement in the composition. The grades range from M-50 to M-1000, while the most popular grades are between 100 and 500. The higher the strength grade, the stronger, more frost-resistant and more durable the concrete.
Today, design specifications often define the class of concrete mix, which shows properties of the mix more precisely. The class of concrete mix denotes the permissible deviation from the mix quality. It shows the strength value obtained for an actual sample while the grade shows the estimated strength only. The class of concrete is marked with the letter ‘B’, and ranges from 3.5to 80. Classes B7.5 to B40 are used in domestic construction.
B20 is a versatile concrete mix used in the construction of high-rise buildings and private houses to build foundations, platforms, footpaths, reinforcing belts, stairs, and retaining walls. It is one of the most widespread mix classes because of its optimal price-strength ratio.
B22.5 is a versatile mix that can be used in domestic construction for structures of any complexity, if it does not violate design requirements. That is why B22.5 is one the most popular mixes. It is considered to be an intermediate class between universal mixtures and those used by construction professionals.
B25 has improved strength, water impermeability, frost resistance, and density and is able to take up significant static and cyclic loads. It is used for concrete casting of foundation slabs, floor slabs, vertical structures, reinforced concrete items, as well as industrial floors that are intended for further topping treatment.
Mixes of class B30 offer increased strength performance. They are used in applications, where the increased strength, waterproofness, and frost resistance are required, including concrete casting of foundation slabs, floor slabs, vertical structures, structural columns, reinforced concrete items, as well as industrial floors that are intended for further topping treatment.
B35 is a high strength concrete used in construction projects, where constant heavy loads are expected. Possible areas of application include bridge construction, hydrotechnical industry, foundations of high-rise buildings, industrial floors, etc.
B45 concrete mixes can withstand extremely high loads.They provide vibration resistance, durability, and resistance to aggressive environments. This concrete class is used for the construction of hydroelectric power stations, subways, industrial facilities, critical facilities, and bridges.
Building companies use B50 mixes to constructultra-strong cast-in-place structures. This is an extremely strong, frost-resistantand chemically resistant material. Applications: construction of bridges, dams,hydraulic structures, strategic military facilities.
Р3 — workability factor measured by concrete slump test, with a slump of 10-15 cm. The mix is used for the construction of foundations, stairs, screeds, floors and for pouring into form works. This concrete mix must only be poured using special construction tools: vibrating pokers, vibrating screeds, concrete laying machines.
Р4 — workability factor measured by concrete slump test, with a slump of 16-21 cm. The mix is used in applications of any complexity level. Due to good workability (fluidity), it fills a form work completely, so that no pores or air voids are formed. The mix can be transported over a long distance by a concrete pump or a chute system.
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