21 Sep

How to choose the right concrete

How to choose the right concrete

We import our own high quality cement which is a Portland Cement 52.50R CEM I cement that complies with BS EN 197-1:2011  (top quality fast setting high early strength) cement. We not only use this cement for our own concrete plant but we also sell and distribute this cement to a wide range of customers using bulk tankers.

The number following the letters refers to the Newton strength of the concrete.

  • C8 *Gen 0 – This mix is used for stabilising underground pipe work or as a dry backing when installing roadside kerbing, erecting posts or for general use where no real strength is required. Other lean mixes available are 12:1 and 18:1 which can be produced fry or semi dry.
  • C10 * Gen 1/C15 * Gen 2 – Both these mixes can be used as foundation or footing mixes for non-load bearing walls, garden walls up to 900mm high and footing mixes for house construction.
  • C20 * Gen 3 – This level of mix may be required as slab foundation for houses or bungalows. It is also used when replacing or making good existing floors. It is also used in farming as a general yard mix as it is strong enough to support light machinery and livestock usage.
  • C25/30 – These mixes are used for footings in house construction where the ground is soft or unstable. It can also be used as slab foundation for the floors of houses and bungalows, also as a base for hard-standings and pathways.
  • C30/C35 – These are structural concrete mixes for roadways, access to farms or anywhere large, heavy vehicles require access on a regular basis. Durable mixes to withstand heavy wear and strong enough to withstand the ever-changing climate, continuous heavy rain, frost, snow and prolonged dry periods.
  • C32/40 – Used widely in farming for the construction of slurry and silage pits. In this environment, it is required to have the strength to contain tonnes of waste product and a strong mix (ie cement content) to withstand the acids and chemicals produced by the content which often stays in the pits for long periods of time.
  • RC 20 up to 50 – (Reinforced Concrete) – Concrete in which steel is embedded in such a manner that the two materials act together in resisting forces. The reinforcing steel—rods, bars, or mesh—absorbs the tensile, shear, and sometimes the compressive stresses in a concrete structure.

For additions to the mix to add strength, reduce cracking or to increase the workability of the concrete please click here.

(* Equivalent of)

21 Sep

What size truck

What size truck

We operate our own 6m3 Concrete Truck with experienced drivers.

We are happy to supply any amount of Concrete (part loads charges apply to smaller loads) from small footings and shed bases to structural strength concrete to larger projects with any mix design.

Please bear in mind that a concrete truck is a heavy large vehicle and considerations should be made when ordering in respect of safe vehicle access, means of accepting the concrete (straight pour, using dumpers, Wheel barrows etc).

Access for Lorry: Please allow 2.6metres (8ft 6ins) width and 3.84 metres (12ft 9ins) height for clearance.

The weight of the lorry fully loaded is 26,000KGs

Consider how the concrete will be discharged. If in barrows, 6 cubic metres is approx. 110 barrows (14.4 tonne). A viable option may be to consider a concrete pump. Please contact us for costs.

 

 

Health & Safety

Cement is irritating to eyes, respiratory system and skin. Keep out of the reach of children. Avoid contact with the skin and eyes as this may cause serious burns and ulcerations or an acute allergic reaction in some people. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. After contact with skin, wash immediately with plenty of water. Wear suitable protective clothing.

21 Sep

Concrete Additions Explained

Concrete Additions Explained

Additives to concrete change the composition of the mix.

Polypropylene Fibres are made up of thousands of individual fibres which when added to the mixing process are dispersed evenly and provide additional benefits to concrete.

12mm fibres are used to control plastic shrinkage and settlement cracking and will also provide secondary reinforcement in all concrete applications.

Benefits in Concrete
Improves mix cohesion
Controls Plastic Shrinkage
Reduce Freeze Thaw effects
Improves structural strength
Reduce steel reinforcements, although not a replacement
Reduce crack widths and control widths tightly, Improving durability
Reduce Shrinkage
Improved Fire resistance.

54mm fibres when added to concrete will significantly improve its durability and residual strength.

Benefits in Concrete
All the benefits listed above
Increased Impact resistance
Increased tensile strength
Improved resistance to spalling and edge damage
Plastic Shrinkage crack reduction
Fire resistance
Improved residual strength
Potential to reduce section thickness
Non-corrosive and non-rusting

Chemical admixtures involve adding chemical products to concrete with the effect of improving the performance and engineering the correct characteristics into the concrete. Addition of plasticizers make the concrete more fluid permitting it to be placed where  reinforcing considerations has made it awkward to achieve  a good fill, or where other difficulties require a wetter concrete mix which is easier to use. Water reducing mixes limit the amount of water necessary and improve the workability of the concrete without loss of strength. Shrinkage reducing concrete admixes are also available which reduce the necessity for undesirable construction and expansion joints.

Retarders are available to slow down the setting time of the concrete for extended time to level and tamper the concrete.

‘Slump’ – is a measure of what the concrete’s ‘plastic (fluid)’ condition will be when the concrete is placed. The higher the slum the easier the concrete flows. To achieve best performance, design concrete mixtures commonly state a ‘slump range’. However adding, (for example) excessive water to the concrete mix, can although making it easier to pour out, seriously weaken the strength of the concrete, however the same flow can be achieved by adding the right amount of admixture and thereby maintain the original design strength.

PLEASE DO NOT HESITATE TO CALL US TO LET US HELP YOU CHOOSE THE RIGHT MIX FOR YOUR APPLICATION