The influence of coarse aggregate size and volume on the fracture behavior and brittleness of self-compacting concrete

Effect of mix design on the size-independent fracture energy of normal- and high-strength self-compacting concrete

“…However, Figure 2 shows that G F rises with the increase of the coarse aggregate fraction. This increase is in agreement with previous research on SCC (26) and it is caused by the lengthening of the frictional part of the loaddisplacement curve (inherent to an increase in the energy dissipation mechanisms: micro-cracking, crack branching, aggregate interlock) and thus, a more pronounced tail of the curve (3).…”

“…However, the change is not as abrupt as it can be expected according to the compressive strength change of the mix from normal-strength to high-strength SCC mixes. This effect is due to the utilization of silica fume as cementitious material in high-strength SCC mixes and the subsequently densification of the ITZ (26). Although G F slightly decrease with the utilization of silica fume as demonstrated before, the internal stiffness of the matrix of the SCC mixes is higher and the increase of tensile strength is not so pronounced because they contain a higher content of cementitious materials and are more susceptible to cracking (3).…”

Effect of sand, fly ash, and coarse aggregate gradation on preplaced aggregate concrete studied through factorial design

“…The 20% increase in coarse aggregate volume could be the reason behind the difference in compressive to tensile strength relations as opposed to conventionally casted concretes. The increase in coarse aggregate volume significantly increases concrete fracture resistance [37,38], which might also be the case in PAC. The high matrix strengths used in the study could also affect PAC fracture properties, but typical high-strength concretes also has high matrix strengths, yet splitting tensile strength to compressive strength ratio is lower than that of conventional concrete and PAC.…”

Fracture properties and response surface methodology model of alkali-slag concrete under freeze–thaw cycles

“…Current studies on ASC are mainly in the reaction mechanism, alkali activator ratio, final product composition, structure, macro mechanics and durability under normal temperature [1][2][3][4][5][6][7][8]. Caijun et al [9] introduced the ASC raw materials, hydration, microstructure development, strength, durability and relevant standards and regulations.…”