Pereira Ana Elizabete Nunes, de Almeida Edson Araujo, Kruger Fábio Rodrigo, da 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 Dec 1;17(23):5889. doi: 10.3390/ma17235889.
Internal curing is a process based on the addition of materials that function as water reservoirs in cementitious media. Superabsorbent hydrogels are an alternative that can be used as an internal curing agent, as they have the ability to absorb and release water in a controlled manner. In the present work, superabsorbent hydrogels based on crosslinked polyacrylamide in the presence of starch and sugarcane bagasse ash (SCBA) were developed and applied to mortars as an internal curing agent. The synthesized hydrogels were evaluated by SEM, FTIR, and swelling analysis. Cement pastes and mortars were produced using different amounts of hydrogel (0.03%, 0.06%, and 0.1% by weight). An analysis of the cement pastes and mortars revealed that hydrogel contributes to hydration, thus improving the quality of the product. Furthermore, the addition of 0.03% hydrogel by weight increased the mechanical resistance of the mortars in up to 26.8% at 28 days of curing as compared with reference (without hydrogel). To the best of our knowledge, this is the first study to use a hydrogel based on polyacrylamide crosslinked with starch and SCBA as a curing agent for mortars and cement pastes. This approach is environmentally friendly, because it uses a natural product (starch) and a byproduct from the sugarcane industry (SCBA).
内部养护是一种基于添加在胶凝材料介质中起水库作用的材料的工艺。高吸水性水凝胶是一种可作为内部养护剂的替代品，因为它们能够以可控方式吸收和释放水分。在本研究中，开发了基于淀粉和甘蔗渣灰（SCBA）存在下的交联聚丙烯酰胺的高吸水性水凝胶，并将其作为内部养护剂应用于砂浆中。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和溶胀分析对合成的水凝胶进行了评估。使用不同量的水凝胶（按重量计0.03%、0.06%和0.1%）制备了水泥净浆和砂浆。对水泥净浆和砂浆的分析表明，水凝胶有助于水化，从而提高了产品质量。此外，与参考样品（无凝胶）相比，按重量添加0.03%的水凝胶可使砂浆在养护28天时的机械强度提高高达26.8%。据我们所知，这是首次使用基于与淀粉和SCBA交联的聚丙烯酰胺的水凝胶作为砂浆和水泥净浆的养护剂的研究。这种方法是环境友好的，因为它使用了天然产物（淀粉）和甘蔗工业的副产品（SCBA）。
