Autogenous Self-Healing: A Better Solution for Concrete

Self-healing concrete with crystalline admixture made with different cement content

“…The obtained results showed the efficiency of crystalline admixture as a self-healing agent mainly with the highest cement content analyzed (500 kg/m 3 ). Rajczakowska et al [15] showed that the high availability of anhydrous cement, provided by high cement content, was not enough for autogenous self-healing. So, the results of porosity tests indicated crystalline admixture had an important role and the increase in cement content also contributed to the healing process.…”

“…Studied since the nineteenth century, autogenous self-healing designates the ability of concrete to self-heal fine small cracks with compounds present in its composition reacting with water, without external operations. Autonomous selfhealing is associated with the presence of unusual materials in the cement matrix, such as by encapsulation of healing agents or capsules containing bacteria [15][16][17][18][19][20]. The type of materials and their proportions influence the effectiveness of autogenous healing [2].…”

Estado del desarrollo y aplicaciones de la tecnología del concreto

“…Con relación a la durabilidad de la edificaciones, hoy en día muchos reglamentos o códigos establecen periodos mínimos de 50 años para la vida útil de la estructuras, sin embargo un incidente común es que cuando los elementos estructurales resultan agrietados por causas diversas, la vida útil o de servicio se ve reducida por el ingreso de agentes exógenos que pueden propiciar el inicio de la corrosión del acero de refuerzo y si no se genera el debido mantenimiento con ello conducir a una falla del elemento estructural, en ese sentido nuevos materiales como el concreto auto-reparable tiene como principal función el de auto-reparar fisuras con aberturas de alrededor de 0.9 mm (Wang, 2014), en este caso el mecanismo de auto-reparación involucra la hidratación continua de la matriz cementante o también la carbonatación mediante la cual los cristales de carbonato de calcio precipitan sobre la superficies de las fisuras como resultado de las reacciones químicas entre los iones calcio (Ca 2+ ) y el dióxido de carbono (CO2) que se encuentra disponible en el agua alojada en el interior de la fisura (Roig , 2021, Magdalena , 2019. Ver figura 1.…”

Effect of Clinker Binder and Aggregates on Autogenous Healing in Post-Crack Flexural Behavior of Concrete Members

“…The restless search for durability and resilience of concrete structures has led some researchers to focus on self-healing concrete composites with the built-in ability of repairing narrow cracks without human or external intervention [ 2 , 3 , 4 , 5 ]. Two major types of self-healing concretes have emerged: the autogenous type [ 4 ], which is achieved by autogenous healing materials such as mineral admixtures like ground-granulated blast-furnace slag (GGBFS), silica fume or fly ash, fibers and nanofillers [ 6 , 7 , 8 , 9 , 10 , 11 , 12 ]; and, the autonomous type [ 3 ], which is realized by unconventional engineered additions such as shape memory alloys, capsules, polymers or bacteria to seal the cracks [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Autogenous healing is an old and well-known phenomenon that originates naturally from the cementitious material like the hydration of clinker minerals or the carbonation of calcium hydroxide while autonomous healing requires a trigger to activate the process.…”

“…The restless search for durability and resilience of concrete structures has led some researchers to focus on self-healing concrete composites with the built-in ability of repairing narrow cracks without human or external intervention [2][3][4][5]. Two major types of self-healing concretes have emerged: the autogenous type [4], which is achieved by autogenous healing materials such as mineral admixtures like ground-granulated blast-furnace slag (GGBFS), silica fume or fly ash, fibers and nanofillers [6][7][8][9][10][11][12]; and, the autonomous type [3], which is realized by unconventional engineered additions such as shape memory alloys, capsules, polymers or bacteria to seal the cracks [13][14][15][16][17][18][19][20][21][22][23][24].…”