Abstract
The article presents the results of the study of the influence of dispersed reinforcement of cement concrete with polypropylene fiber with different variations of fiber consumption, fine and coarse aggregates, as well as coarse aggregates’ maximum size on the strength and crack resistance. The analysis of complete state diagrams of the studied concrete series shows a slight difference in the subcritical stage of concrete failure (until the beginning of the main crack movement) between reinforced and non-reinforced concrete. The main advantage of the introduced polypropylene fiber could be observed in the supercritical fracture stage - the fiber inhibits the fracture process of the sample after the moment of the main crack development (when the maximum destructive load was already applied). The fracture toughness increases with grain size of coarse aggregate increasing from 15 to 20 mm, with subsequent stabilization of its value. Increasing of the cement-sand mortar amount in concrete leads to increase in the fracture toughness, while the specific effective energy consumption for static fracture does not change significantly and reaches the maximum value at grain spacing coefficient of 1.4. As the amount of introduced fiber increases from 4 to 7 kg per 1 m3 of concrete, the fracture toughness increases and remains at the same level with the maximum fiber content of 10 kg.
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Turba, Y., Solodkyy, S. (2021). Crack Resistance of Concretes Reinforced with Polypropylene Fiber. In: Blikharskyy, Z. (eds) Proceedings of EcoComfort 2020. EcoComfort 2020. Lecture Notes in Civil Engineering, vol 100. Springer, Cham. https://doi.org/10.1007/978-3-030-57340-9_58
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