Self-healing characterization of UHPFRCC with crystalline admixture: Experimental assessment via multi-test/multi-parameter approach

An overview of a twofold effect of crystalline admixtures in cement-based materials: from permeability-reducers to self-healing stimulators

“…In J o u r n a l P r e -p r o o f contrast, Escoffres et al [35] found that the presence of sustained tensile loading decreased the healing kinetics in HPFRCCs especially with CA; however a higher load was required to reach again the initial permeability in mixtures with CA. Lo Monte et al [100] have recently proposed a methodology for the assessment of the self-healing based on cracking-healing cycles in HPFRCCs beam specimens stimulated by CA underwater immersion. The mechanical recovery was measured in terms of stiffness and load-bearing capacity.…”

“…• The eventual chemical pre-stressing in fibers from CAs precipitation must be further investigated and the different behavior of different types of fibers [7,35]. • Developing a comprehensive work that encompasses CAs action as a closing, sealing and healing stimulator simultaneously, and taking into account the depth of healing products in the cracks [39,100]. • It is worth confirming the optimum CA dosages that enhance durability-related aspects, considering the admixture type and the effects expected in cementitious material [30,35,43].…”

Meta-Analysis and Machine Learning Models to Optimize the Efficiency of Self-Healing Capacity of Cementitious Material

“…Similarly, ultra high-performance (or fiber-reinforced) concretes (UHPC/UHPFRC) materials, due to their mix composition, featuring a high binder content and a low water/binder ratio [ 17 , 18 , 19 ], have also been identified as highly conducive to exhibit autogenous self-healing capacity, also thanks to their ability to spread and control the damage through small crack width, which works as an excellent governing parameter for self-healing in the presence of water, promoting the delayed hydration of the available substantial amounts of unhydrated binder, and with the presence of the seal healing promoters as well [ 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Effects of Autogenous and Stimulated Self-Healing on Durability and Mechanical Performance of UHPFRC: Validation of Tailored Test Method through Multi-Performance Healing-Induced Recovery Indices

“…This also brings the breakthrough concept of transforming the material from a passive provider of protection into an active player, able to respond to degradation processes as a function of the durability requirements of the engineering application [32]. In this framework, it is evident that the experimental methodology conceived to assess the self-healing capacity of this category of materials has to be soundly based on a multiplicity of tests [33], enabling the quantification of the closure of the cracks as well as the recovery of the durability properties, which surely relies on the former, and of their mechanical tensile properties, which benefit not only from the reconstruction of the through-crack material continuity but also from a healing-induced enhancement of the fiber-matrix bond.…”

“…The material employed has been designed and tested, with reference to its mechanical and durability performance [27,[31][32][33], to be employed for the construction of a tank containing geothermal water and serving cooling towers in a geothermal power plant, as a pilot demonstrator of the Horizon 2020 ReSHEALience project (rethinking coastal defense and green-energy service infrastructures through enHancEd-durAbiLity high-performance cement-based materials-GA 780624-www.uhdc.eu, accessed on 6 October 2021) [5,32].…”