When reinforced concrete elements are subjected to high temperatures, such as in a fire, they are susceptible to physical and chemical changes that cause spalling, thereby undermining their performance under such conditions. It is known that the age and the internal moisture content of concrete are factors that contribute to this event, but the intensity of spalling is not yet a consensus. This study aimed to assess the influence of age and internal moisture on the performance of concrete walls at high temperatures. Therefore, 6 real-scale walls were built with dimensions of 3.15 × 3.00 m, with the same composition of concrete, for tests in a vertical furnace under the ISO 834 curve, for ages of 7, 14, 28, 56, 84 and 830 days. Moisture was measured as per the electrical resistivity of concrete. It was noted that walls with ages above 84 days showed no spalling whatsoever, due to the internal moisture of concrete. The most severe spalling took place at 14 days, thus evidencing that pore interconnectivity and hydrated cement crystallization can contribute as well.

当钢筋混凝土构件经受高温（例如在大火中）时，它们容易受到会引起剥落的物理和化学变化的影响，从而破坏了它们在这种条件下的性能。众所周知，混凝土的年龄和内部水分含量是造成此事件的因素，但剥落的强度尚未达成共识。这项研究旨在评估年龄和内部水分对高温下混凝土墙体性能的影响。因此，建造了6个尺寸为3.15×3.00 m，具有相同混凝土成分的真实比例墙，用于在垂直炉中根据ISO 834曲线进行测试，其使用年限为7、14、28、56、84和830。天。根据混凝土的电阻率测量水分。值得注意的是，由于混凝土内部的水分，年龄超过84天的墙没有出现剥落现象。最严重的剥落发生在第14天，因此证明孔隙的相互连通性和水合水泥的结晶也可以起作用。