Abstract
The paper reports a study of the effect of carbon fibres on the mechanical fracture parameters of alkali-activated slag mortars. The carbon fibres were added in the amount of 1, 2 and 3%, respectively with respect to the mass of the slag. The mechanical fracture parameters were determined using evaluation of fracture tests carried out on 40 × 40 × 160 mm beam specimens with an initial central edge notch. The monitored parameters were compressive strength, modulus of elasticity, effective fracture toughness and specific fracture energy. The specimen response during fracture tests was also monitored by means of acoustic emission. It was shown that as the addition of carbon fibres increased the value of compressive strength and modulus of elasticity of alkali-activated slag dropped to 50% in case of the highest amount of fibres. The effective fracture toughness is not significantly influenced by addition of carbon fibres. On the other hand, the fracture energy value gradually increases with addition of carbon fibres, up to more than twofold increase in case of the highest amount of fibres.
Highlights
Nowadays, the binders based on ordinary Portland cement (OPC) are the most commonly used in manufacturing of building materials like concrete, mortars and fine-grained composites
The compressive strength value decreased with addition of 1, 2 and 3% of carbon fibres by 5, 23 and 56%, respectively, which is in contradiction with some data reported in literature [9, 10]
It can be assumed that lower compressive strength value of alkali-activated slag mortars reinforced by carbon fibres is due to matrix higher porosity compared to denser matrix of nonreinforced mortar
Summary
The binders based on ordinary Portland cement (OPC) are the most commonly used in manufacturing of building materials like concrete, mortars and fine-grained composites. The other way is use the alkaliactivated binder, this type of material is even more effective in reducing CO2 emissions and energy consumption [2, 3]. These binders are formed by mixing of some aluminosilicate based material, such as blast furnace slag or fly ash with an alkaline activator and water [4, 5]. The mechanical properties and application possibilities of materials based of alkali-activated binders are very similar to those based on OPC. The addition of different types of fibres into alkaliactivated matrix might lead to reduced cracking tendency and improvement tensile properties of these materials as in case of OPC based materials
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