The objective of this work was to evaluate the effect of the relative humidity on the accelerated carbonation process of the fiber-cement composites reinforced with a high concentration of vegetable fibers. The samples were produced with 10% of bleached eucalyptus pulp, in a method of fabrication similar to the commercial boards. The composites were submitted in an atmosphere with CO₂ saturation, and relative humidity range of 60–90% to evaluate the effect of this parameter on the development of carbonation reaction. X-ray diffraction and thermogravimetric analysis were accomplished at different times, for monitoring the formation of carbonates along the accelerated carbonation process. Microstructure, physical and mechanical properties, and degradation were also evaluated. The composites carbonated with 60% of relative humidity presented a formation of CaCO₃ significantly higher (37%) than the other concentrations of relative humidity (70, 80 and 90%) in just 4 h of carbonation. The densification of the cementitious matrix increased by 17%, and the modulus of rupture by 43% compared to non-carbonated composites. There was no statistically significant difference between the relative humidity of 60 and 70% for the physical and mechanical properties of the materials, and in general, the carbonation process preserved the reinforcement capacity of eucalyptus pulp in fiber-cement even after the accelerated aging cycles. In conclusion, this study demonstrated that the concentration of the relative humidity of the curing atmosphere is the main vehicle for diffusion and reactivity of the accelerated carbonation process. The use of the ideal relative humidity content can provide a faster and more effective carbonation reaction, in the production of fiber-cement materials.

这项工作的目的是评估相对湿度对高浓度植物纤维增强的纤维水泥复合材料加速碳化过程的影响。用类似于商业木板的制造方法，用10％的漂白的桉木浆生产样品。所述复合材料在CO ₂气氛下提交。饱和度和60-90％的相对湿度范围，以评估该参数对碳酸化反应发展的影响。X射线衍射和热重分析在不同的时间完成，以监测加速碳化过程中碳酸盐的形成。还评估了微观结构，物理和机械性能以及降解。用相对湿度60％碳酸化的复合材料形成了CaCO ₃在碳酸化仅4小时内，其相对湿度（70、80和90％）的浓度就显着高于其他浓度（37％）。与未碳化的复合材料相比，水泥基的致密化提高了17％，断裂模量提高了43％。材料的物理和机械性能在60％和70％的相对湿度之间没有统计学上的显着差异，并且通常，碳化过程即使在加速老化周期后仍能保留纤维水泥中的桉木浆增强能力。总之，这项研究表明，固化气氛的相对湿度集中是加速碳化过程扩散和反应的主要媒介。