Comportamiento mecánico del hormigón sometido a altas temperaturas confinado con CFRP = Mechanical behaviour of concrete subjected to high temperatures confined with CFRP.
DOI:
https://doi.org/10.20868/ade.2021.4975Keywords:
Cemento, temperatura, CFRP, compresión, Concrete, temperature, compressionAbstract
El hormigón es el material estructural más empleado. En el caso de sufrir una agresión térmica, sus propiedades mecánicas se ven modificadas, siendo en muchos casos necesaria su reparación para poder seguir utilizando la estructura. Teniendo en cuenta las premisas anteriores, el objetivo de la presente investigación es determinar la viabilidad del refuerzo de estructuras de hormigón con CFRP, después de haber sido sometidas a una agresión térmica. Para la realización del trabajo experimental se fabricaron probetas cilíndricas de 100 mm de diámetro y 200 mm de altura, la mitad de las cuales fueron sometidas a 250ºC. Una vez enfriadas, la mitad de las probetas patrón y la mitad de las probetas sometidas a 250ºC se reforzaron con fibra de carbono unidireccional SikaWrap-230 C, para posteriormente ensayar todas ellas a compresión y determinar la viabilidad del refuerzo. Los resultados obtenidos muestran que, debido a la agresión térmica, el hormigón pierde parte de su capacidad resistente, reduciéndose su resistencia máxima en un 26%. Una vez reforzadas las probetas, su resistencia máxima aumenta un 105% en el caso de probetas patrón y un 89,5% en el caso del hormigón sometido a 250ºC.
Abstract
Concrete is the most widely used structural material. In the case of suffering a thermal aggression, its mechanical properties are modified, being in many cases necessary to repair in order to be able to continue using the structure. Taking into account the above premises, the aim of the present research is to determine the viability of reinforcement of concrete structures with CFRP, after being subjected to thermal aggression. For the realization of the experimental work, cylindrical specimens of 100 mm in diameter and 200 mm in height were made, half of which were subjected to 250ºC. Once cooled, half of the standard specimens and half of the specimens subjected to 250ºC were reinforced with SikaWrap-230 C unidirectional carbon fiber, in order to subsequently test all of them in compression and determine the viability of the reinforcement. The results obtained show that due to the thermal aggression, the concrete loses part of its resistance capacity, reducing its maximum resistance by 26%. Once the specimens are reinforced, their maximum strength increases by 105% in the case of standard specimens and by 89.5% in the case of concrete subjected to 250ºC.
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