Chloride migration test for UHPC and UHPFRC
Scientists recently developed a modified, accelerated chloride migration test for UHPC and UHPFRC with PVA and steel fibers.
Accelerated migration tests which are commonly used to measure chloride diffusion in ordinary cement-based materials cannot be directly applied to composite with very low permeability, such as Ultra High-Performance Fiber Reinforced concretes (UHPFRC). In order to assess the UHPFRC enhancement on the structural durability, there is a critical need to accurately assess the permeability level of the material to chloride ions.
Investigation of the resistance of chloride ion penetration
The objective of a recently published work is to adapt an existing set-up of accelerated chloride migration test in order to (i) better characterise the resistance of chloride ion penetration in UHPFRC; and (ii) to compare the resistance of chloride ion penetration between UHPC and UHPFRC. The material characterisation, the set-up modifications of the existing accelerated migration test, the results are presented. In conclusion, the modification of the test-set-up allowed to accurately measure chloride transport of very low permeability UHPFRC and to shed light on the effect of the fiber reinforcement.
The study is published in: Cement and Concrete Research Volume 117, March 2019, Pages 38-44.
