Akademik Veri Yönetim Sistemi
European Journal of Environmental and Civil Engineering, cilt.29, sa.7, ss.1282-1303, 2025 (SCI-Expanded, Scopus)
The alkali-silica reaction is a crucial factor affecting the strength and durability of concrete and reinforced concrete structures due to the expansion it induces. This expansion leads to increased internal stresses, resulting in cracks. In this study, the effectiveness of mineral-admixed mortars on ASR-induced microcracks using image processing were investigated. In this scope, crack images were obtained from mortars produced with different dosages of fly ash (FA), blast furnace slag (BFS), silica fume (SF), metakaolin (MK) and the expansion percentages of the mortars were measured. The relationship between the average crack width measured from the surface of the mortars using image processing techniques and the expansion percentages was comparatively analysed. Mortar bars prepared with various mineral admixtures at different ratios to evaluate expansion. Mineral admixtures exhibited significantly lower expansion at 3, 7, 14, and 28 days compared to the reference mortar. 15%FA, 20%BFS, 5%SF, 5% and 10%MK was not sufficient to reduce below the limit value of 0.1% specified in the relevant standard. The results obtained from image processing techniques showed significant reductions in ASR-induced crack widths with an increase in the percentage of mineral admixture. The highest decrease in crack width was observed with 60% BFS, while the lowest decrease was seen with 5%SF. According to statistical evaluation, except for the results obtained from mortars containing silica fume after 28 days, there is a linear relationship between average crack width and expansion in all mortars with mineral additives.