Self-healing efficiency of Ultra High-Performance Fiber-Reinforced Concrete through permeability to chlorides. (6th December 2021)

• Record Type: Journal Article
• Authors: Doostkami, Hesam; Roig-Flores, Marta; Serna, Pedro
• Is Part Of: Construction & building materials. Volume 310(2021)
• Publication Date: 2021-12-06
• Subjects: Ultra-High-Performance Fiber Reinforced Concrete -- Self-healing -- Autogenous healing -- Crystalline Admixture -- Water Penetration -- Chlorides; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2021.125168
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Water penetration in concrete with different cracks is evaluated by chloride penetration. The evaluation of self-healing through chloride penetration presents reliable results. UHPFRC shows better self-healing than conventional and high-performance concretes. Abstract: This study presents a novel methodology to evaluate the self-healing capability of Ultra High-Performance Fiber-Reinforced Concrete (UHPFRC) designed to compare conventional concrete types. The procedure used combines loading reinforced concrete elements until a fixed strain level to have a comparable total crack opening. Afterwards, water penetration to chlorides is used as an indicator of permeability. This work compares autogenous healing efficiency of a conventional concrete, a high-performance concrete, and two types of UHPFRCs with and without 0.8% of a crystalline admixture (CA) by the binder weight. The results show that all UHPFRC specimens exhibited excellent autogenous healing, higher than conventional concretes for an equivalent total crack. The self-healing results depended greatly on the crack size and the fiber content. Additionally, UHPFRCs with CA obtained the lowest water permeability after promoting self-healing for one month in water immersion and presented almost complete healing against chloride penetration.