CONCRETE TYPES AND SPECIALIST MIXES

All ranges of concrete are approved by Karl Friston – Cullimore Mix Manager. We also carry out a concrete cube testing facility.

We supply to major construction companies and small DIY businesses who both supply a valuable service to the local communities.

• Standardised prescribed concrete: ST1 | ST2 | ST3 | ST4 | ST5
• General concrete: GEN0 | GEN1 | GEN2 | GEN3
• Reinforced concrete: RC20/25 | RC25/30 | RC28/35 | RC32/40 | RC35/45 | RC40/50
• Paving concrete: PAV1 | PAV2
• Foundation concrete: FND2 | FND3 | FND4

Standardised Prescribed Concretes

Standardised Prescribed Concrete or ST Concrete mixes are a defined list of Concretes within BS 8500 which are made with a prescribed quantity of materials as required in the British Standard. SPCs are fairly basic mixes and have no strength guarantee, although this can be assumed based on the values contained within BS 8500.

General Concrete

Gen designation used for a series of concretes that are used for housing, and similar non-structural applications. The requirements specify a minimum quantity of cement (minimum cement content, or MCC) to be included, but no water cement ratio (w/c) and as such, they have relatively low levels of durability.

Reinforced Concrete

Reinforced Concrete or RC Concrete is used in reinforced or pre-stressed concrete, or concrete containing embedded steel. The specifications for the RC-series of designated concretes include requirements for maximum water to cement ratio (W/C) and minimum cementitious content (MCC), which makes specification easier and complete. The range of uses for this group of mix types ranges in size from a lightly reinforced house or garage floors to industrial and agricultural reinforced concrete that is exposed to highly demanding exposure conditions.

Paving Concrete

Paving Concrete designations give the concrete the necessary level of freeze-thaw resistance for conditions experienced in the UK and are suitable for almost all external domestic and structural roads, pavements and hard standings. These have specified minimum cementitious content (MCC) and water to cement (W/C) ratios but also require the mix to contain a minimum air content which varies dependant on the maximum aggregate size used/specified.

Foundation Concrete

Foundation Concrete or FND Concrete mixes are specified for foundations, they are used in footings for various buildings where engineers have to have the soil analysed. The report for the engineer will stipulate the DC class of chemical resistance that is needed on a particular site and the DC value dictates the appropriate FND grade of concrete.

Oversite Concrete

A layer of concrete underneath the ground floor of a building, as a seal. An oversite slab, a slab on grade, a flat, solid layer of concrete laid over prepared ground, usually serving as a base for flooring.

Foam Concrete

Foam concrete, also known as Lightweight Cellular Concrete (LCC), Low Density Cellular Concrete (LDCC), and is defined as a cement-based slurry.

Waterproof Concrete

Waterproof concrete (also called integral concrete) is generally best for water retaining structures and less critical basements that are less than 10 meters deep, where soil conditions are not aggressive, and where the consequences of flooding are less severe. This includes unfinished, basic utility spaces such as car parks and workshops where some seepage and damp patches are tolerable.