• Determination of the fracture toughness K Ic S and CTO D c in quaternary binder concretes (QBC). • Application of Digital Image Correlation (DIC) measurements to QBC. • Two measuring devices were used in the studies, i.e. MTS 810 press and DIC system. • Linear and nonlinear fracture mechanics parameters were analyzed. • There is a correlation between K Ic S and CTO D c obtained by using two measuring devices. The following article presents an extensive investigations of the fracture mechanics parameters of concretes made of quaternary binders (QBC). A composition of the two most commonly used mineral additives, i.e. fly ash (FA) and silica fume (SF) in combination with nanosilica (nS), has been proposed as a partial replacement of the ordinary Portland cement (OPC) binder. Four series of concretes were made, one of which was the reference concrete (REF) and the remaining three were QBC. During the studies K Ic S and CTOD c were investigated. In addition, digital image correlation (DIC) technique was used. Based on the conducted studies it was found that the QBC containing: 80% OPC, 5% FA, 10% SF, and 5% nS have shown the best results of K Ic and CTOD c, whereas the worst parameters were characterized by concrete with more content of FA additive in the concrete mix, i.e.,15%.