Adherence to the requirements and proportions during preparation of concrete for foundations will ensure stability, integrity and strength of the building structure. Foundation works* are carried out using standard concrete mixtures of class B15 to B30, and sometimes B35. The choice of concrete grade depends on the load on the structure and its type. The heavier the structure, the higher the class of concrete for the foundation should be.You should consider the heat rise (heat release) issues when choosing the concrete grade, as the more massive the structure, the greater the heat release from the concrete. The resulting temperature rise can lead to the risk of obtaining a low-quality structure (thermal cracking may occur).
Choosing the concrete class for your foundation is a critical item, and usually it is specified by the construction engineers 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 high quality of our concrete mixes for foundations 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.
В15 is a widely used mix used to construct light dutydomestic foundations, apply floor screeds, lay concrete footpaths or buildsteps. It provides average water impermeability and frost resistance, so it ismore commonly used for interior works. This is a reliable, durable material withan excellent price-quality ratio.
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.
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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