Rodrigues Ruth Hevellen Sousa, de Almeida Edson Araujo, Kruger Fábio Rodrigo, Silva-Filho Edson Cavalcanti, Muniz Edvani Curti
Chemistry Postgraduation Program, Federal University of Piaui-UFPI, Teresina 64049-550, PI, Brazil.
Chemistry Postgraduation Program, State University of Maringa-UEM, Maringá 87020-900, PR, Brazil.
Materials (Basel). 2024 Nov 24;17(23):5746. doi: 10.3390/ma17235746.
Superabsorbent polymers (PSAs) have been extensively studied to act as internal curing agents in cementitious materials, as they have the characteristic of absorbing and releasing water in a controlled manner, which can contribute to the hydration process of a cementitious medium during its consolidation. Thus, hydrogels consisting of polyacrylamide (PAAm), pectin (Pec) and rice husk ash (RHA) were synthesized to be applied in cementitious matrices. In addition, the PSAs were characterized by FTIR, SEM, and XRD. For evaluating the usage of hydrogels as internal curing agents, different hydrogel contents-0.03, 0.06, and 0.1 (wt-%, relative to cementitious components)-were used for mortar preparation. The mechanical strengths of the cementitious materials were evaluated at day 7 and day 28 during the curing process. The addition of PSAs to the mortars caused an increase in mechanical resistance such that the 0.06% content presented better performance at day 7 of curing (4.07% higher) and at day 28 of curing (8.06% higher) when compared with the reference mortar (without the addition of PSAs) in the same curing periods. This work demonstrates that the addition of PSAs contributes to the hydration of a cementitious material, improving the mechanical resistance of the studied mortars.
高吸水性聚合物（PSAs）作为水泥基材料中的内部养护剂已得到广泛研究，因为它们具有以可控方式吸收和释放水分的特性，这有助于水泥基介质在固结过程中的水化过程。因此，合成了由聚丙烯酰胺（PAAm）、果胶（Pec）和稻壳灰（RHA）组成的水凝胶，以应用于水泥基基质中。此外，通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和X射线衍射（XRD）对高吸水性聚合物进行了表征。为了评估水凝胶作为内部养护剂的使用情况，在制备砂浆时使用了不同的水凝胶含量——0.03%、0.06%和0.1%（重量百分比，相对于水泥基组分）。在养护过程的第7天和第28天对水泥基材料的力学强度进行了评估。向砂浆中添加高吸水性聚合物导致力学强度增加，与相同养护期的参考砂浆（未添加高吸水性聚合物）相比，0.06%的含量在养护第7天（高出4.07%）和养护第28天（高出8.06%）表现出更好的性能。这项工作表明，添加高吸水性聚合物有助于水泥基材料的水化，提高所研究砂浆的力学强度。
