Effects of coarse aggregate and wavy steel fiber volumes on the critical stress intensity factors of modes I and III cracks in self-compacting concrete using ENDB specimens

Using beam and ENDB specimens to evaluate fracture characteristics of wavy steel fiber‐reinforced self‐compacting concrete containing different coarse aggregate volumes

“…After 3‐point bending tests on WSFRSCC ENDB specimens, the fracture toughness was found for pure loading Modes I and III; results are available in Hoseini et al 71 In this research, the pure Mode I fracture energy was calculated for ENDB specimens by Equation (1), and the average results are listed in Table 5.…”

“…In this research, ENDB specimens were prepared as follows: (1) placing WSFRSCC specimens in cylindrical molds 15 cm in diameter and 30 cm in height, (2) cutting them into 4 cm thick disks (same diameter), and (3) creating initial midcracks in disks (a = 1.2 cm) in the direction of the diameter with a thin blade; the specimens then underwent 3-point bending tests. 71 3 | RESULTS AND DISCUSSTION…”

“…Edge notched disk bend (ENDB) specimen geometry: (A) pure Mode I, (B) pure Mode III 71 [Colour figure can be viewed at wileyonlinelibrary.com]…”

“…Therefore, researchers prefer to use small, easy-to-carry, simple geometry specimens to reduce laboratory work, enhance setup activities, and find accurate results so that they can evaluate the fracture characteristics of beam specimens with SEM and WFM. Since materials, mix designs and making/curing processes of concrete specimens containing different CA and WSF volumes were similar, the relationship between the maximum load and fracture energy, under pure loading Mode I, of beam specimens found with SEM and WFM and those of ENDB specimens was investigated using the nonlinear regression analysis based on the results of the fracture characteristics of ENDB specimens provided by Hoseini et al 71 Equation ( 10) represents the relationship between the maximum fracture loads of SEM specimens (different beam sizes) and those of ENDB specimens, and Table 6 shows the relevant coefficients. Figure 10 shows that the presented relations have been able to present acceptable maximum load estimations based on the results of ENDB specimens.…”

Comparative cracking resistance‐cost study for the hot mix asphalt (HMA) mixtures made of natural and recycled asphaltic materials

“…These two indexes can be determined experimentally using suitable laboratory samples. Review of available works reveals that some test specimens including SCB, [87][88][89][90][91][92][93][94][95][96][97] short and long cracked beams subjected to three-or four-point bending, 57,[98][99][100][101][102][103] center cracked Brazilian disk under diametric compression, 104,105 and the ENDB 52,64,[106][107][108][109][110][111][112][113][114][115][116] are among the common used test samples for investigating mixed modes I and II fracture in asphaltic materials. Among them, the ENDB specimen is the newest developed sample and has some advantages such as ease of manufacturing and testing.…”