da Fonseca Régis Pamponet, Rocha Janaíde Cavalcante, Cheriaf Malik
Post-Graduate Program in Civil Engineering, Federal University of Santa Catarina, Laboratory of Waste Valorization and Sustainable Materials (ValoRes), CEP 88040-900 Florianópolis, SC, Brazil.
Department of Civil Engineering, Federal University of Santa Catarina, Laboratory of Waste Valorization and Sustainable Materials (ValoRes), CEP 88040-900 Florianópolis, SC, Brazil.
Materials (Basel). 2020 Dec 31;14(1):155. doi: 10.3390/ma14010155.
The addition of natural fibers used as reinforcement has great appeal in the construction materials industry since natural fibers are cheaper, biodegradable, and easily available. In this work, we analyzed the feasibility of using the fibers of piassava, tucum palm, razor grass, and jute from the Amazon rainforest as reinforcement in mortars, exploiting the mechanical properties of compressive and flexural strength of samples with 1.5%, 3.0%, and 4.5% mass addition of the composite binder (50% Portland cement + 40% metakaolin + 10% fly ash). The mortars were reinforced with untreated (natural) and treated (hot water treatment, hornification, 8% NaOH solution, and hybridization) fibers, submitted to two types of curing (submerged in water, and inflated with CO in a pressurized autoclave) for 28 days. Mortars without fibers were used as a reference. For the durability study, the samples were submitted to 20 drying/wetting cycles. The fibers improved the flexural strength of the mortars and prevented the abrupt rupture of the samples, in contrast to the fragile behavior of the reference samples. The autoclave cure increased the compressive strength of the piassava and tucum palm samples with 4.5% of fibers.
添加用作增强材料的天然纤维在建筑材料行业具有很大吸引力，因为天然纤维价格更低、可生物降解且易于获取。在这项工作中，我们分析了使用来自亚马逊雨林的巴西棕纤维、图库姆棕榈纤维、龙舌兰麻和黄麻纤维作为砂浆增强材料的可行性，利用了复合粘结剂（50%波特兰水泥 + 40%偏高岭土 + 10%粉煤灰）质量添加量为1.5%、3.0%和4.5%的样品的抗压强度和抗弯强度等力学性能。砂浆用未处理（天然）和处理过（热水处理、角质化、8%氢氧化钠溶液处理以及杂交处理）的纤维增强，进行两种类型的养护（浸泡在水中，以及在加压高压釜中用二氧化碳充气）28天。无纤维的砂浆用作参考。对于耐久性研究，样品经历20次干湿循环。与参考样品的易碎行为相反，纤维提高了砂浆的抗弯强度并防止样品突然破裂。高压釜养护提高了纤维含量为4.5%的巴西棕和图库姆棕榈样品的抗压强度。
