VSM / Efficiency / Concrete shrinkage and cracking

Concrete shrinkage and cracking

The main reason of insufficient durability of concrete is shrinkage cracking at the early stages of concrete hardening, when concrete structure is being formed (1 to 6 hours). Changes in volume are caused by evaporation both in fresh and hardened concrete.

Shrinkage deformations result in internal strains, which have the greatest effect in confined spaces, in contact zones with large aggregate or steel reinforcement. Such strains may cause ruptures in contact zones and in matrix that can finally lead to both surface and internal cracking, especially when accompanied by temperature strains. Shrinkage strains have negative influence on freeze-thaw stability, impermeability, fatigue resistance and lead to prestress loss of tendons.

VSM-fiber allows for significant reduction of crack-inducing processes by controlling hydration and reinforcing the cement matrix. VSM reduces internal stresses and the number of internal defects of concrete preventing their propagation.

Even distribution of a large number of separate fibers in concrete (180-360 fibers per 1 cm3) ensures effective prevention of primary shrinkage and significantly contributes to elimination of initial crack formation.

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