Abstract
This paper presents test results of mechanical properties of fibre-reinforced sand concrete (FRSC) formulated to be used in the sprayed wet-mix process, as a substitution to fibre-reinforced concrete (FRC) sprayed by dry-mix process. This process of application of concrete is suitable for diverse applications such underground support and slope stabilization. In FRC, formulated with aggregates up to 8 mm, both material and fibre rebounds are high (from 35 to 50 and 50 %, respectively); this results in economic implications and affects the performances of the mixture negatively. FRSC formulated with low dosage of cement, sand and high content of limestone filler, but without coarse aggregate, seems to be indicated to alleviate most of these problems, because of its fineness, high cohesiveness, high fluidity and better homogeneity. FRSC was investigated and compared with FRC, on the basis of fresh and hardened properties with special emphasis on rebound, compressive strength and drying shrinkage. Results of investigations showed many advantages of this new mixture (FRSC) when compared to FRC: reduction in material and fibre rebounds by approximately 50 %, relatively substantially thicker layers (9 vs 6 cm), good finishing surface, higher early-age compressive strength and long-term drying shrinkage close to that of FRC. On the other hand, the present study showed that a low amount of steel fibre (50 kg/m3) reduces the drying shrinkage of FRSC by approximately 16 %, while in the case of FRC, the influence is not significant.
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Benaissa, I., Nasser, B., Aggoun, S. et al. Properties of Fibred Sand Concrete Sprayed by Wet-Mix Process. Arab J Sci Eng 40, 2289–2299 (2015). https://doi.org/10.1007/s13369-015-1753-3
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DOI: https://doi.org/10.1007/s13369-015-1753-3