In some applications of high-strength concrete the design criterion is the elastic modulus rather than the ultimate compressive strength.Stamped concrete is an architectural concrete that has a superior surface finish.Such software provides the user an opportunity to select their preferred method of mix design and enter the material data to arrive at proper mix designs. Regular Roman concrete for example was made from volcanic ash (pozzolana), and hydrated lime.Roman concrete was superior to other concrete recipes (for example, those consisting of only sand and lime) used by other cultures.
High-strength concrete is made by lowering the water-cement (W/C) ratio to 0.35 or lower.
UHPC is characterized by being a steel fibre-reinforced cement composite material with compressive strengths in excess of 150 MPa, up to and possibly exceeding 250 MPa.
UHPC is also characterized by its constituent material make-up: typically fine-grained sand, silica fume, small steel fibers, and special blends of high-strength Portland cement. The current types in production (Ductal, Taktl, etc.) differ from normal concrete in compression by their strain hardening, followed by sudden brittle failure.
Organic materials (leaves, twigs, etc.) should be removed from the sand and stone to ensure the highest strength.
High-strength concrete has a compressive strength greater than 40 MPa (5800 psi).