Textile-reinforced mortars, also known as fibre-reinforced cementitious matrices, are emerging as one of the reliable techniques for strengthening and repair of structures. They combine high-strength, open-mesh textiles usually made of non-metallic materials with inorganic mortars. Alkali-activated materials are identified as potentially good materials for structural repair due to their rapid strength development, good mechanical and durability properties, good bond with a wide range of substrates and, in general, lower carbon footprint. Combining textiles with alkali-activated repair mortars was already proven possible. There are, however, concerns regarding the possibility that textiles made of alkali-resistant glass fibres could lose their integrity over time due to the somewhat higher pH that can be potentially the case for alkali-activated mortars in comparison to their Portland cement counterparts. The aim of this research is to explore this hypothesis by comparing tensile properties of textile-reinforced alkali-activated mortar coupons at the age of 28 days and 365 days after casting. The 10 mm thick, 60 mm wide and 500 mm long coupons are made of alkali-activated mortars (based on blast furnace slag and mixture of sodium silicate and potassium hydroxide) and longitudinally reinforced with one layer of epoxy-coated alkali-resistant glass fibre textile mesh. Five specimens were tested in tension after 28 days, and another 5 were kept under laboratory climate for one year after which they were also tested in tension. The strains were monitored via a digital image correlation system. Stress-strain behaviour, failure modes and strain distributions alongside specimens at failure are reported and compared.