It would be difficult to produce high-strength concrete mixtures without using chemical admixtures. A common practice is to use a superplasticizer in combination with a water-reducing retarder. The superplasticizer gives the concrete adequate workability at low water-cement ratios, leading to concrete with greater strength. The water-reducing retarder slows the hydration of the cement and allows workers more time to place the concrete.

Manufacture of high-strength concrete involves making optimal use of the basic ingredients that constitute normal-strength concrete. Producers of high-strength concrete know what factors affect compressive strength and know how to manipulate those factors to achieve the required strength. In addition to selecting a high-quality portland cement, producers optimize aggregates, then optimize the combination of materials by varying the proportions of cement, water, aggregates, and admixtures.

Tarmac High Strength Concrete (N) is a cement based material and should be handled and stored with care. Unopened bags can be stored in either outdoor or indoor conditions. Open bags should be stored in dry cool conditions protected from wind. Information on the maximum storage period (shelf life) of the product is shown on the bag. Normal manual handling procedures (Manual Handling Operations Regulations ) should be followed when unloading or moving bags.