Design and Production

The most common method of creating high-strength concrete is to design and control the combination of cementitious material, aggregates, water, and admixtures. Cementitious materials include portland cement, fly ash, silica fume, ground granulated blast furnace slag, or natural pozzolans. Typically, fly ash or ground granulated blast furnace slag substituted for some of the portland cement is an effective method to increase the long-term strength of a mixture. Low water/cementitious materials ratios likewise increase concrete strength (up to a limit), in accordance with Abramís Law. Strong, cubical aggregates are also important in high-strength mixes.

Several specific parameters are considered in the production of high-strength concrete.

A flow chart for mix design follows:

Figures 4.1 and 4.2 (Nawy)