MECHANICAL ACTIVATION OF LIMESTONE PARTICLES BY IMPACT LOADING AND ITS EFFECT ON THE STRENGTH OF BASALT FIBER CONCRETE
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Abstract
The article presents a theoretical study of the mechanism of destruction of single limestone particles under high–speed impact loading with an impact velocity of 50-250 m/s and an experimental study of the effect of the process of mechanical activation of limestone waste from the developed deposits of the Crimea on the strength properties of fine-grained limestone basalt fiber concrete.
Subject of the study: the process of destruction of single limestone particles under impact loading and the effect of mechanical activation of limestone on the strength properties of fine-grained basalt fiber concrete.
Object and research methods: limestone particle model, limestone waste, samples of fine-grained limestone basalt fiber concrete; computer modeling using a numerically modified finite element method, mechanical activation of limestone waste in a rotary crusher, standard manufacturing methods and determination of strength properties of basalt fiber concrete.
Conclusions: It has been theoretically established that the stress distribution during impact loading of single limestone particles is wave–like and with an increase in the impact velocity from 50 to 250 m/s, the fracture surface increases by 2.4 - 3 times. It is shown that during mechanical activation of limestone waste in a rotary crusher, the compressive strength of fine-grained limestone basalt fiber concrete increases by 13-14%, and the bending tensile strength increases to 30%.
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References
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