Abstract
To understand the influence of sand/cement (S/C) ratio on the mode I fracture characteristics of the sandstone-concrete interface (SCI) at different ages, the quasi-static three-point bending test was carried out on semi-circular bi-material specimens. Experimental results indicate that the fracture toughness (KIC) of SCI increases first and then decreases with the increase of S/C ratio. Furthermore, when the age of concrete is between 0.5 and 7 days, the fracture energy (Gf) of SCI with different S/C ratios fall in the following order: G1.0>G0.0>G3.5. However, when the age of concrete ranges from 14 to 28 days, the order of fracture energy is changed to G3.5>G1.0>G0.0. Additionally, many obvious acoustic emission signals appear before the final failure of the specimen when the S/C ratio is 3.5. However, when the S/C ratios are 0.0 and 1.0, only few apparent acoustic emission signals appear at the final failure. In addition, when the S/C ratios are 0.0 or 1.0, the load–displacement curve of specimens in the age interval [0.5d, 28d] has one single peak point. However, when the S/C ratio is 3.5, the load–displacement curve of specimens in the age interval [7d, 28d] shows double-peak points. Moreover, the S/C ratio also controls the failure pattern of SCI. Compared to those with S/C ratios of 0.0 and 1.0, the broken concrete or rock with S/C ratio of 3.5 is more dispersed.
Published Version
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