Abstract

Alfa plant (Stipatenacissima L.) and wheat straw fibers were investigated as reinforcement in cementitious matrix. The fibers were used separately in three states: raw, wet (by immersion in water) and alkali treated. A reference mortar without fibers and mortars with 1% and 1.5% by volume of the two different bio-fibers were used. The mechanical and physical properties of mortar specimens were studied as well as the morphological analysis was carried out after 28 days of curing. The results exhibit that both Alfa and Straw fibre addition changed the mechanical performance of mortars in comparison to the reference mortar. A higher porosity and water absorption were observed after the addition of raw and wetted fibers. The alkali treatment caused morphological changes that were proved more efficient. This treatment provided a good result in terms of mechanical and physical properties. Furthermore, the addition of 1% by volume of alkali treated fibers affords both mechanical and physical properties better than the control mortar. SEM micrographs confirmed the good fibers/matrix adhesion of the alkali treated fibers.

摘要

阿尔法植物 ( StipatenacissimaL.) 和小麦秸秆纤维作为水泥基体的增强材料进行了研究。纤维分别以三种状态使用：生的、湿的（通过浸入水中）和碱处理的。使用不含纤维的参考砂浆和具有 1% 和 1.5% 体积的两种不同生物纤维的砂浆。研究了砂浆试件的力学和物理性能，并在养护 28 天后进行了形态分析。结果表明，与参考砂浆相比，Alfa 和 Straw 纤维的添加都改变了砂浆的机械性能。在添加生纤维和润湿纤维后观察到更高的孔隙率和吸水率。碱处理引起的形态变化被证明更有效。这种处理在机械和物理性能方面提供了良好的结果。此外，添加 1%（体积）的碱处理纤维提供了比对照砂浆更好的机械和物理性能。SEM 显微照片证实了碱处理纤维的良好纤维/基体粘附性。