Amirhossein Davarpanah T.Q.'s scientific contributions

To aid in the creation of sustainable structures, scientists have utilized waste materials found in the environment to serve as alternatives for traditional resources in the construction sector. They have undertaken extensive investigations pertaining to this matter. In this particular study, tempered glass as waste glass coarse aggregate (WGCA) was substituted for natural coarse aggregate (NCA) at varying proportions of 15%, 30%, and 45% in the formulation of eco-friendly self-compacting concrete (SCC), combined with hooked-end steel fibers (SFs) at various volumes. The study assessed concrete’s flowability, permeability, compressive strength, and fracture parameters at 28 and 56 days. A total of 240 edge-notched disc bending samples (ENDB) and 60 cubic samples (150 × 150 mm) were tested to assess fracture resilience and compressive strength, respectively. The results showed that increasing SF and WGCA content reduced slump flow diameter and blockage ratio, particularly at higher levels. The solidified characteristics of all specimens incorporating SF and WGCA displayed heightened attributes when contrasted with the reference sample. Among the entire array of specimens, WG15SF0.5 and WG30SF0.5 exhibited the most superior performance, demonstrating an average percentage elevation of 20.29 and 27.63 in both compressive strength and fracture toughness assessments across the different curing periods. SF had the most significant impact on post-cracking behavior by enhancing load-bearing capacity through a bridging fiber mechanism. Through a comparison of the influence of SFs and WGCA on the fracture toughness of pure mode III, it was observed that the inclusion of SF in samples with a 30% replacement of WGCA resulted in an average increase of approximately 15.48% and 11.1% in this mode at the ages of 28 and 56 days, respectively, compared to the control sample.

The use of waste materials in the concrete industry has been a topic of interest for researchers around the world in recent decades. In this research, the fracture toughness (Kc) of edge-notched disc bend (ENDB) specimens of self-compacting mortars containing 0%, 20%, 40%, 60%, 80% and 100% waste glass aggregates (WG) under the pure mode 1, mixed mode 1/3, mixed mode 3/1, and pure mode 3 in ages of 14, 28 and 56 days have been studied. The results show that the use of 20% and 40% of WG will improve the fracture toughness of the mortars. On the other hand, increasing the curing age from 14 to 28 days, with and without WG, improves the fracture toughness of samples significantly. Increasing the curing age has the highest impact on the results of pure mode 3. In addition, due to the effective fracture toughness results, pure mode 3 is introduced as critical loading condition for self-compacting mortars containing WG.