3 PREHEALING: Design of concrete precast elements incorporating sustainable strategies for self-healing to increase their service life: Full-Scale Prototypes

Resumen

This project deals with the analysis of the performance of concrete with internal curing aggregates (IC), low clinker cementitious materials and steel fibres, to be used in real applications in the field of precast industry. This section includes the design and results of the four wall prototypes: two constructed with the 100C mix and two with the 60C25BA15MK-30CBA mix. The model shows the instrumentation used. The foundation of all walls was constructed with conventional concrete. Two curing conditions were established: a conventional curing by water spraying and an extreme curing, in which a continuous air flow was generated, with temperature and humidity controlled in both cases. The curing was maintained for 7 days. Inspections were conducted after formwork removal to assess crack formation.   After 28 days, the walls were subjected to a controlled loading process to induce residual cracks of 150 ± 20 μm. During this process, the behaviour of the walls was monitored with the instrumentation installed during construction. Additionally, movements and cracking were monitored with LVDTs and LDS. Two LVDTs were used to monitor head movement of the wall during loading, and two LDS were used to monitor potential foundation sliding. For crack formation monitoring, four LVDTs and one LDS were placed on the tension face in the crack formation area: two on each section, S1 and S2, one on the central section of the wall, S0, and two at a lower height in intermediate sections.   Finally, the entire loading and cracking process was monitored through a Digital Image Correlation (DIC) system. Data from the instrumentation fed into the BIM model.   Attached: PH_IFC4_rev01.ifc: the resulting IFC model (as-built) after testing. PH_BIMx_rev01.bimx: the model and shrinkage results of the four walls tested at 1, 3, 9, 14, and 28 days. Cracking and sealing wall images.zip: Images, taken with a digital microscope, along the main crack in each wall. These images show the different stages of cracking and sealing after self-healing periods with tap water for 75 days, followed by carbonated water (rich in CO₂) for an additional 75 days.