Concrete Types

Please see below a list of all our mix designs we have to offer and their uses for each product. Each mix design can be altered with admixtures and fibres to be suitable for each project. If you require a special mix or a mix design sent to you, then please email our Technician Aaron directlyThis article offers free shipping on qualified products, https://www.swisswatch.is/product-category/richard-mille/rm-37-01/ or buy online and pick up in store today at Medical Department.

C15 \| (GEN 2)	Step-filling and blinding’s. Used for mild-structural work, filling hollows, footings without reinforcement, or providing a clean "blinding" layer over soil before a main slab is poured.
C25 \| RC25 / ST4	General Construction. Used for driveways, trench fills, and mass concrete fill.
C30 \| RC30	Driveways and Patios. Used for outdoor paths, reinforced foundations, and light-duty external slabs.
C35 \| RC35	Commercial Hardstanding’s. A heavy-duty mix for external areas where heavy vehicles (vans/small trucks) will operate.

C40 \| RC40 \| PAV 1	Structural Beams and Suspended Slabs. Used in commercial buildings for structural members (columns/beams), septic tanks, and areas requiring high durability. Often contains Air Entrainment to protect against frost for external applications.
C45 \| RC45 \| PAV 2	High Durability Concrete. Often specified for concrete beams or piles. It is used in "aggressive" environments, such as bridge decks or areas exposed to mild chemical attack. Often contains Air Entrainment to protect against frost for external applications.
C50 \| RC50	Heavy Industrial / Civil Engineering. Used for coastal defence’s, high-stress bridge supports, Crane Bases, or slurry pits where the concrete must resist extreme chemical or physical wear.

Slumps

Class / Range (mm)	Description	Consistency
S1 (10 – 40)	Semi-Dry	Very stiff; holds its shape almost entirely.
S2 (50 – 90)	Low Workability	Semi Stiff; requires significant Vibration.
S3 (100 – 150)	Medium Workability	Standard mix; plastic and easily shaped.

Class / Range (mm)	Description	Consistency
S4 (160 – 210)	High Workability	Flowable; very easy to place and level.
S5 (≥ 220)	Very High Workability	Self-Levelling – Slabs, Uneven Grounds, Footings

Admixture Additions

Water Reduction and Strength

Water Reducer (Plasticiser)	Superplasticiser
Reduces the amount of water needed to make the mix flow. Less water means the concrete is much denser and stronger once cured.	High Flow (S5) Used for "Self-Levelling" or pumped concrete. It makes the mix very fluid without needing to add extra water which would weaken it.

Timing & Temperature Control

Set Accelerator for Cold Weather	Retarder for Hot Weather
Speeds up the chemical reaction. This is essential in winter to help the concrete "go off" before it freezes and to allow for earlier finishing.	Delays, Slows down the setting process. Used in summer or Larger Pours to stop the concrete from "stiffening".

Durability & Protection

Air Entraining Agent	Waterproofer
(Freeze/Thaw Protection) Creates millions of microscopic bubbles. These act as "expansion chambers" that allow frozen water to expand inside the concrete without cracking it. Essential for roads/paths.	(Watertightness) Chemically blocks the tiny pores (capillaries) in the concrete. This prevents liquid or water from soaking through walls or floors.

Reinforcement & Surface Control

Concrete Fibres (Crack Control)
Thousands of tiny plastic hairs that hold the mix together. They reduce "plastic shrinkage" cracks while the concrete is still wet and improve impact resistance.