Long-Term Bonding and Tensile Strengths of Carbon Textile Reinforced Mortar

Kira Heins,Annette Kolkmann,Matthias May,Thomas Gries,Gum-Sung Ryu,Magdalena Kimm,Lea Olbrueck,Hyeong-Yeol Kim,Gi-Hong Ahn

doi:10.3390/ma13204485

Abstract

This paper deals with the long-term bonding and tensile strengths of textile reinforced mortar (TRM) exposed to harsh environments. The objective of this study was to investigate the long-term bonding and tensile strengths of carbon TRM by an accelerated aging method. Moisture, high temperature, and freezing–thaw cycles were considered to simulate harsh environmental conditions. Grid-type textiles were surface coated to improve the bond strength with the mortar matrix. A total of 130 TRM specimens for the bonding test were fabricated and conditioned for a prolonged time up to 180 days at varying moisture conditions and temperatures. The long-term bonding strength of TRM was evaluated by a series of bonding tests. On the other hand, a total of 96 TRM specimens were fabricated and conditioned at freezing–thaw conditions and elevated temperature. The long-term tensile strength of TRM was evaluated by a series of direct tensile tests. The results of the bonding test indicated that TRM was significantly degraded by moisture. On the other hand, the influence of the freezing–thaw conditions and high temperature on the tensile strength of the TRM was insignificant.

Highlights

Textile reinforced mortar (TRM) is an innovative construction material consisting of a high-performance textile reinforcement and a fine-grained mortar matrix
This paper presents the results and findings of two series of durability tests carried out to evaluate long-term performance carbon
textile reinforced mortar (TRM) specimens fabricated with surface coated carbon

Summary

Introduction

Textile reinforced mortar (TRM) is an innovative construction material consisting of a high-performance textile reinforcement and a fine-grained mortar matrix. It allows the construction of thin, lightweight, and durable structures with high surface quality and high strength [1,2]. In the last two decades, TRM has been successfully applied in new construction as well as in the strengthening of old concrete structures [3]. In Germany, the Collaborative Research Centres 528 (at TU Dresden) and 532 (at RWTH Aachen University) have conducted basic research on textile reinforced concrete. During these research projects (532 and C3 ), several investigations testing the bonding strength and durability were conducted

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