Investigation of the effect of components on tensile strength and mode-I fracture toughness of polymer concrete

Influence of testing method on mode II fracture toughness (KIIc) of hot mix asphalt mixtures

“…This value shows relatively good agreement with the typical range of K Ic reported in the literature for the similar mixtures under similar testing conditions. [1][2][3][4][17][18][19][29][30][31][71][72][73][74] However, as shown in previous works, 35,[71][72][73][74] the magnitude of mode II fracture toughness for asphaltic materials depends on the composition of mixture and also environmental condition of testing (such as temperature, loading rate, moisture content, freeze/thaw cycles, aging, and etc. )…”

“…[8][9][10][11][12][13][14][15] This is because making laboratory test sample in the mentioned geometries is easier than other geometries and shapes for asphalt mixtures. Center cracked circular disc (CCCD) specimen subjected to compression diametral force (often known as Brazilian disc), 16,17 semi-circular bend (SCB) specimen containing either vertical or inclined edge crack, [18][19][20][21][22][23][24][25][26][27] edge notch disc bend (ENDB) specimen, [28][29][30][31][32][33][34][35][36] and disc specimen weakened by U-notch 37 are among the circular shape test samples in this regard that are able to introduce both mode I and mode II deformations in asphaltic samples. Other disc shape test samples such as edge notch compressed disc (ENDC), [38][39][40][41] edge notch disc double notch disc compression (DNDC), 42 wedge splitting (WS), 43,44 and disc shape compact tension (DCT) specimen [45][46][47] fail in producing mode II case, and they can be used mainly for mode I fracture testing.…”

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

“…An important parameter in the concrete fracture process is the fracture energy, which is strongly affected by the characteristics of the used cement and CAs as well as the microstructural conditions 10–12 . This parameter, which is used in the design stage of concrete structures/elements to understand the concrete properties, 13 is defined as the area under the load–displacement curve per unit area of the crack surface 14 . Another important parameter in the fracture mechanics is the fracture toughness, which is, in fact, the resistance against the crack growth; it is the critical stress intensity coefficient of the relevant loading mode 15–18 .…”

Mixed mode I+II fracture parameters and cracking trajectory of heterogeneous multilayer pavement structure containing reflective crack

“…These fracture parameters for pavement structure are functions of the elastic modulus and Poisson's ratio of the asphalt components, the crack length, the thickness of the HMA layer, and so on 7 . In recent years, several researchers have used different laboratory tests including the semicircular bending (SCB) test, 20–28 the dissipated creep strain energy (DCSE) test, 29 the disc‐shaped compact tension (DCT) test, 30,31 the edge notch disc bend (ENDB) test, 32–39 and so on 40,41 for investigating and analyzing the fracture behavior of asphalt mixtures. However, many of these laboratory tests cannot simulate exactly the cracking mechanism of real asphalt mixture in the field 23,36,42–53 .…”