Cyclic Response of Highly Ductile Fiber-Reinforced Cement-Based Composites

The response of highly ductile fiber-reinforced cement-based composites (DFRCC) to uniaxial monotonic and cyclic loading is examined. The DFRCC studied herein is a portland cement-based mortar matrix with a low volume fraction (~2%) of high modulus polymeric fibers. Various cyclic testing schemes were employed to examine the effect of cyclic loading on the material's compressive and tensile stress-strain envelope. The response of different tensile specimen geometries was also examined. A distinctive feature of DFRCC is its pseudo-strain hardening response in tension. Test results identified a unique unloading and reloading response for DFRCC, which is a consequence of fibers debonding and pulling out of the matrix. Reversed cyclic loading was seen to affect the tensile response of the material if the uniaxial compressive strength during loading was exceeded, and not to affect the tensile response if compressive strength was not exceeded. Evaluation of tensile specimen geometries revealed significant variations in strain capacity between the different geometries.

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