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This paper reports the results of the measurements of alkali-activated slag mortars made during the hardening and drying of specimens. The alkali-activated slag is a material with a great potential for practical use. The main drawback of this material is its high level of autogenous and, especially, drying shrinkage, which causes a deterioration in the mechanical properties. The aim of this paper is to present the effects of the treatment method for mortars and the curing time on the microstructures of the alkali-activated slag mortars. The knowledge of the microstructure/performance relationship is the key to a true understanding of the material behaviour. The results obtained in the laboratory are useful for understanding the various stages of the micro-cracking activity during the hardening process in quasi-brittle materials such as alkali-activated slag mortars and for their extension to field applications. Non-destructive acoustic-analysis methods – the impact-echo method as a traditional method and the acoustic-emission method as a non-traditional method for civil engineering – were used for the experiment. The principle of the impact-echo method is based on analysing the response of an elastic-impulse-induced mechanical wave. Acoustic emission is the term for the noise emitted by materials and structures when they are subjected to stress. The types of stress can be mechanical, thermal or chemical. Ultrasound testing and the loss in mass were used as complementary methods for the tested samples.

Non-traditional non-destructive testing of the alkali-activated slag mortar during the hardening