In this work we studied the effect of pre-treatment of low-grade flax product (flax tows, FTs) by cleaning it mechanically from shives and weeds, followed by mercerization with a 5% aqueous NaOH solution and ultrasonic (US) treatment (22 kHz, 500 W) in alkaline medium, on the mechanical properties and microstructure of fly ash-based geopolymer (GP) composites. A series of three-point bending flexural tests was conducted on several types of GP/FTs composites while ATR-FTIR spectroscopy, scanning electron microscopy, and confocal laser scanning microscopy were applied to evaluate morphological and chemical characteristics of FTs and their interface strength with GP matrix. It is shown that combined treatment with alkali and high-intensity ultrasound is an effective way to process and modify the surface of FTs fibers for reinforcing “green” geopolymer composites, providing the best technical and economic effects.

在这项工作中，我们研究了对低级亚麻产品（亚麻丝束，FTs）进行预处理的效果，方法是通过机械方式将其从细屑和杂草中清除出来，然后用5％的NaOH水溶液进行丝光处理并进行超声波（US）处理（22 ，在碱性介质中，对粉煤灰基地质聚合物（GP）复合材料的力学性能和微观结构的影响。在几种类型的GP / FTs复合材料上进行了一系列的三点弯曲挠曲测试，同时使用ATR-FTIR光谱，扫描电子显微镜和共聚焦激光扫描显微镜来评估FT的形态和化学特性以及它们与GP的界面强度矩阵。