This study aims at assessing the potential use of cellulose pulp in MgO-water slurries with potential for precast composites. These systems for composites applications envisage encapsulating CO₂ when exposed to fast carbonation. The effect of cellulose fibers was evaluated on samples after the drainage of MgO-cellulose-water slurries. Different cellulose mass fractions were added into MgO-water suspensions – up to 30 wt% – to study the MgO hydration during the first 96 h. Afterward, the carbonation of the hydrated products for 6 and 12 h was evaluated. The addition of cellulose, after hydration, increases the sample porosity, where Mg(OH)₂ is the main crystalline phase and only minor traces of unreacted MgO are found. MgO-H₂O systems after hydration do not present any binding capacity given the low density and high apparent porosity of the clusters. However, XRD and TG analyses show that exposing samples to a rich CO₂ environment promotes the formation of nesquehonite (MgCO₃·3H₂0), which significantly reduces the porosity induced by the cellulose hygroscopy. This reduction in porosity is greater for samples with cellulose fibers because of the greater content of nesquehonite produced in samples with cellulose. Besides, cellulose fibers are covered with nesquehonite nanocrystals after carbonation. By adding cellulose to water-MgO suspensions yields lighter products with promising potential for fiber-cement applications. Moreover, the addition of cellulose contributes to the encapsulation of CO₂ in building materials through the Mg(OH)₂ carbonation.

这项研究旨在评估纤维素纸浆在MgO-水浆料中的潜在用途，并具有预制复合材料的潜力。这些用于复合材料应用的系统设想在暴露于快速碳酸化时封装CO ₂。排水MgO-纤维素-水浆后，评估纤维素纤维对样品的影响。将多达30 wt％的不同纤维素质量分数添加到MgO-水悬浮液中，以研究前96小时内MgO的水合作用。然后，评估水合产物碳酸化6和12小时。水合后添加纤维素会增加样品的孔隙率，其中Mg（OH）₂是主要的结晶相，仅发现了少量未反应的MgO。氧化镁H ₂考虑到团簇的低密度和高表观孔隙率，水合后的O系统没有任何结合能力。然而，XRD和TG分析表明，将样品暴露于丰富的CO ₂环境中会促进菱镁矿（MgCO ₃ ·3H ₂0），这大大降低了由纤维素吸湿法引起的孔隙率。对于含纤维素纤维的样品，孔隙率的降低更大，这是因为含纤维素纤维的样品中产生的Neshonhonite含量较高。此外，碳化后纤维素纤维被水松石纳米晶体覆盖。通过在水-MgO悬浮液中添加纤维素，可以生产出更轻的产品，在纤维水泥应用中具有广阔的发展前景。此外，纤维素的添加通过Mg（OH）_2的碳化作用而有助于将CO ₂封装在建筑材料中。