Fracture properties of cement and alkali activated fly ash based concrete with application to segmental tunnel lining

Mechanical Properties Prediction of Blast Furnace Slag and Fly Ash-Based Alkali-Activated Concrete by Machine Learning Methods

“…The connection between elastic modulus and compressive strength collected from the existing literature on BFS/FA-AACs is illustrated in Fig. 12 [6,7,33,76,77,[79][80][81][82]85,[89][90][91][92][93][94][95][96][97][98][99][100][101][102]. According to the results, the elastic modulus (E) and the compressive strength of BFS/FA-AACs are positively correlated despite some fluctuations.…”

Fiber Reinforced Fly Ash Concrete and Extreme Fires

“…old tunnels, conditions resulted in different heat curves that represent the particular fire. After series of experiments with concrete panels subjected to loading with RWS curve which assumes 50 m 3 fuel tanker fire lasting for 120 minutes [1,2], the modified RWS curve was derived to represent loading on tunnel lining 50 m downstream of the source of fire. The different fire loading curves used in different countries and the modified curve used for the experiments are presented in Fig.…”

Fracture Surface Fractal Characteristics of Alkali-Slag Concrete under Freeze-Thaw Cycles

“…Vidya Sagar and Raghu Prasad [12] used singular fractal functions 2 Advances in Materials Science and Engineering to generate stress-strain plots for quasi-brittle material like concrete and cement mortar. Fu et al [13] studied the ASC damage model under freeze-thaw cycles;Šejnoha et al [14] summarized the fracture toughness of concrete for tunnel lining; Cai et al [15] studied the ASC antifreeze durability; Sun and Wu [16] investigated the chemical properties and frost resistance of fly ash inorganic mixture; Li et al [17] studied fractal characteristics of concrete fracture surface before and after freezing and thawing and applied fractal theory to study freeze-thaw damage; results show that the fracture toughness and fractal dimension have a good correlation, so fractal theory and concrete fracture theory can be combined to evaluate the fracture behaviour of concrete under freezethaw cycles; Zhang [18] suggested that when concrete fracture surface fractal dimension increases, the fracture toughness will also increase and that the fracture surface roughness increases the material anticracking ability; Guo et al concluded application of fractal theory in concrete material mechanical behaviour, distribution of aggregates, concrete fracture toughness and fracture energy, pore, concrete material acoustic emission, and many other aspects of application [19,20]. Erdem and Blankson [21] determined quantitatively the fractal character and texture of fracture surfaces and investigated their influence on the fracture-related properties in different types of concrete.…”