This experimental study investigates the effect of re-saturation after air-drying and oven-drying at 60 °C on the evolution of hydric and strength behaviour of a standard mortar. Various tests are carried out and lead to the following observations. The swelling occurs relatively quickly, then remains constant and slightly lower than the drying shrinkage for air-dried samples, whereas for oven-dried samples it develops progressively and largely exceeds the drying shrinkage before tending toward stabilisation. The uniaxial compressive strength increases with air and oven-drying in similar proportions. The compressive strength of air-dried samples decreases after one day of re-saturation then increases and overtakes that of saturated samples with time, which mainly indicates a resumption of hydration generated by the drying/re-saturation process that exposes un-hydrated cement to water. However, even if moderately improved after one month of re-saturation, the compressive strength of oven-dried samples almost does not vary any further for six months in remaining lower than that of saturated samples. Moreover, the bending strength increases moderately with air-drying but significantly with oven-drying. With re-saturation, the bending strength of air-dried samples decreases after one day, increases again after one month, then remains constant and lower than that of saturated samples whereas the bending strength of oven-dried samples decreases progressively and more significantly compared to that of saturated samples. All of these results illustrate the significant influence of drying conditioning mode on re-saturated behaviour.

本实验研究调查了在 60 °C 下风干和烘箱干燥后的再饱和度对标准砂浆的含水量和强度行为演变的影响。进行了各种测试并得出以下观察结果。膨胀发生得相对较快，然后保持恒定并略低于风干样品的干燥收缩率，而对于烘箱干燥的样品，它逐渐发展并在趋于稳定之前大大超过干燥收缩率。单轴抗压强度随着空气和烘箱干燥以相似的比例增加。风干样品的抗压强度在再饱和一天后降低，然后随时间增加并超过饱和样品的抗压强度，这主要表明由干燥/再饱和过程产生的水化的恢复，该过程将未水化的水泥暴露于水。然而，即使再饱和一个月后适度改善，烘箱干燥样品的抗压强度在六个月内几乎没有进一步变化，保持低于饱和样品的抗压强度。此外，弯曲强度随风干适度增加，但随烘箱干燥显着增加。随着再饱和，风干样品的抗弯强度在一天后下降，一个月后再次增加，然后保持不变并低于饱和样品，而烘箱干燥样品的抗弯强度逐渐降低，与饱和样品相比更显着。饱和样品。