Abstract

In the last years, the use of adhesive bonding is increasing as an alternative to traditional joining techniques due to their advantages such as ease of application, low weight and the good mechanical properties. To ensure good adherence between the substrates, adequate materials and surface treatment are required. The main objective of this work is to evaluate the adherence of epoxy and polyurethane adhesives between a pultruded composite material and a geopolymer. Two different surface treatments were evaluated: unidirectional abrasion (UA) and bidirectional abrasion (BA). Epoxy and polyurethane adhesives were tested. The epoxy and polyurethane adhesives showed, respectively, ductile and fragile behavior. The adherence of the bonded joints was evaluated using pull-off tests. Pultruded samples treated with UA and bonded with the polyurethane adhesive presented higher strength (13 MPa). Geopolymer samples bonded with the epoxy adhesive and treated with UA reached a failure tensile of 8 MPa. Considering the different testing conditions evaluated in this work, the best combination of an adhesive type and surface treatment produced an increase in the pull-off strength of 220 and 240% in pultruded composite bonded joints and geopolymer bonded joints, respectively.

摘要

在过去的几年中，由于粘接剂的优点，例如易于使用，重量轻和良好的机械性能，它逐渐取代传统的粘接技术。为了确保基材之间的良好粘合，需要适当的材料和表面处理。这项工作的主要目的是评估拉挤复合材料和地质聚合物之间环氧和聚氨酯粘合剂的粘合性。评估了两种不同的表面处理：单向磨耗（UA）和双向磨耗（BA）。测试了环氧和聚氨酯粘合剂。环氧和聚氨酯粘合剂分别显示出韧性和脆性。使用拉拔试验评估粘合接头的附着力。经UA处理并与聚氨酯粘合剂粘合的拉挤成型样品具有更高的强度（13 MPa）。用环氧树脂粘合剂粘结并用UA处理的地聚合物样品的破坏拉伸强度为8 MPa。考虑到这项工作中评估的不同测试条件，胶粘剂类型和表面处理的最佳组合分别使拉挤复合粘结接头和地质聚合物粘结接头的抗拉强度分别提高了220％和240％。