SELF-HEALING OF SELF-COMPACTING CONCRETES MADE WITH BRAZILIAN BLAST FURNACE SLAG CEMENTS ACTIVATED BY CRYSTALLINE CATALYST
Author(s): Takagi, E. M., Lima, M. G. and Helene, P.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
Publication year: 2015
Total Pages: 8
Abstract: Different approaches have been developed to study new types of concrete that have the ability to repair cracks. Autogenic self-healing improves the natural healing mechanism of concrete through incorporation of a catalyst that activates material components already present in the concrete. The occurrence of the crack is the trigger mechanism because it allows the penetration of water to activate the crystalline catalyst (Cat-X) and newly fractured sub-hydrated cement and non-activated blast furnace slag (BFS) particles. Test samples were examined using three types of Brazilian commercial cements: blast furnace slag cement (CP III RS), slag modified Portland cement (CP II-E) and Portland cement (CP V ARI) with percentages in the range of 55%, 35% and 0%, respectively. Test specimens were loaded in compression to 90% of failure load, in order to generate a network of micro-cracks. Samples were immersed in water to trigger the self-healing mechanism, followed by various tests after 28, 56 and 84 days. Recovery of mechanical properties and watertightness indicated greater self-healing in the CP III, CP V and CP II cement samples, respectively. As the BFS content ratio was increased to 55%, there was a noticeable increase in the mechanical recovery and permeation reduction properties due to the addition of Cat-X. Therefore, it appears that the specimens with added BFS and Cat-X are less affected by mechanical loads.
Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00