Effect of crystalline admixtures on the self-healing capability of early-age concrete studied by means of permeability and crack closing tests. (1st July 2016)

• Record Type: Journal Article
• Authors: Roig-Flores, M.; Pirritano, F.; Serna, P.; Ferrara, L.
• Is Part Of: Construction & building materials. Volume 114(2016)
• Page Start: 447
• Page End: 457
• Publication Date: 2016-07-01
• Subjects: Concrete -- Self-healing -- Autogenous -- Crystalline admixtures -- Permeability -- Durability; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2016.03.196
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Self-healing is analyzed by permeability and crack closing in concrete specimens. Self-healing has been compared for two concrete classes healing underwater. Healing has been evaluated under water immersion at 15 °C, 30 °C and wet/dry cycles. The results are compared with previous tests, comparing a total of six exposures. Abstract: This paper analyzes the self-healing properties of early-age concretes, engineered using a crystalline admixture (4% by the weight of cement), by measuring the permeability of cracked specimens and their crack width. Two concrete classes (C30/37 and C45/55) and three healing exposure conditions have been investigated: water immersion at 15 °C, at 30 °C and wet/dry cycles. Specimens were pre-cracked at 2 days, to values of crack width in the range of 0.10–0.40 mm. The results show almost perfect healing capability for specimens healed under water at 30 °C, better than for specimens healed under water at 15 °C, while insufficient for the wet/dry exposure.