Use of fiber-reinforced self-healing cementitious materials with superabsorbent polymers to absorb impact energy

© 2019 Taylor & Francis Group, London. One of the major flaws with concrete remains the susceptibility to cracking. The behavior and self-healing of cementitious materials with synthetic microfibers and superabsorbent polymers (SAPs) during and after a static four-point-bending test have been proven successful. Itwas however not known howthis material reacts when subjected to impact loading. In this study, a reference mixture and a mixture containing 1 m% of SAP were tested at an age of 28 days and stored in different healing conditions (Wet/Dry cycles and at 95 ±5% RH). After 28 days of healing the specimens are impacted and healed again. The applied impact test is a Drop- Weight-Test (DWT) and the healing is microscopically monitored and studied by means of natural frequency analysis. Specimens containing SAPs showa more ductile behavior during impact loading compared to reference samples. This ductile behavior enhances multiple cracking of the strain-hardening cementitious materials causing a possible higher amount of autogenous healing, which was confirmed by natural frequency analysis. The evolution of the natural frequencies shows a superior healing caused by SAPs in both Wet/Dry-cycling and storage at 95 ± 5 % RH.

ISBN:978-1-138-62633-1

Jaar van publicatie:2019