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Shop Asphalt, Concrete Masonry at Lowes. Pavingexpert AJ Mc. Cormack Son. Strength. When ordering concrete, you may be advised by the technical staff to order a Prescribed Mix, such as C2. P or a special purpose Designated Mix, such as PAV2 for hardstandings and drives. Concrete is graded in strength using a system based on the compressive strength after 2. This generates a value in Newtons per square millimetre Nmm which results in mixes being referred to as, for example, C7. C2. 0, which means that a particular mix will achieve a minimum compressive strength of 7. Nmm or 2. 0Nmm after the 2. Weaker, bedding concretes are usually Class 7. De La Soul The Grind Date Rar. C7. 5. Strength grade increases up to very strong, C4. For most hard landscaping purposes, a C2. This is roughly equivalent to the old 4 2 1 mix. Its also worth noting that the new European standards introduced on December 1st 2. See the Prescribed Mixes page for technical information on the ratios of materials used in the preparation of common concrete mixes. You will also need to specify how wet you want the concrete to be when delivered. Bulk Insert Multiple Csv Files there. Wetness is measured in mm of slump that is, how far a given measure of the concrete will slump or slip in a cone test. For bedding purposes, a semi dry mix is best, as it gives a longer working time, and prevents the bedded paviors from floating and losing their level setting. For haunching and general purpose, a 5. Delivery wagons usually carry extra water on board that can be added to the mix if it is too dry or stiff. If the concrete is too wet, youre stuck with it NOTE The addition of too much water to a designated mix can weaken the end strength try to order the correct slump, so that the batch plant can guarantee 2. Slump, consistence and the cone test are discussed in much more detail on the All About Slump page.