Strain hardening cement-based materials can be produced by addition of high performance polymer fibers such as PVA or PE fibers to a fine fresh mortar. It is well known that multi-cracking of the cement-based matrix leads to pseudo ductility. In…
Strain hardening cement-based materials can be produced by addition of high performance polymer fibers such as PVA or PE fibers to a fine fresh mortar. It is well known that multi-cracking of the cement-based matrix leads to pseudo ductility. In this contribution records of the surface of a SHCC specimen have been taken by means of a high-resolution digital camera. From the records taken principal strain fields and crack formation can be followed as function of imposed strain. The numerical evaluation method of experimental data is based on pattern recognition. The displacements and deformations of elements of the stochastic pattern on the surface are determined. It turned out that PVA fibers stabilize fictitious cracks in the cement-based matrix. A complex redistribution of stresses and strains can be observed under increasing strain. These mechanisms have to be considered to be at the origin of pseudo ductility of SHCC. Results presented in this contribution may serve as a solid basis for the development of a realistic numerical model, which may help to optimize strain hardening cement-based materials for practical applications.