Abstract
In this study, the influence of the addition of styrene-butadiene rubber on the dynamic properties of polymer concrete was investigated. A 10% volume addition of styrene-butadiene rubber granulate with three different grain gradations was used for the tests. The modal study was carried out in the 0 to 2000 Hz frequency range. The response function for a single impulse excitation was tested. The relaxation time after excitation, the modes of natural vibrations and the amplitude of the transfer function values as well as vibration damping ratios were also compared. Finally, conclusions were formulated regarding the application of the styrene-butadiene rubber additive as a material to improve the dynamic properties of polymer concrete. The best results were obtained for a sample made with a 10% styrene-butadiene rubber volume addition with grain sizes from 0.6 to 2 mm. In this case, the biggest decrease of the amplitude of the transfer function value was 76%, while the biggest increase of the damping ratio was 431.5%, in comparison with the clear polymer concrete sample. The worst results were obtained for a sample made with a 10% styrene-butadiene rubber volume addition with grain sizes from 2.5 to 6 mm. In this case, the longest relaxation time of the sample, the increase of the amplitude of the transfer function value and the decrease in the damping coefficient were recorded.
Highlights
The damping of the vibrations of construction materials is one of the most important factors determining the dynamic properties of machines and has a significant impact on the machining capabilities of a machine tool.[1,2,3,4,5] The latest development trends in the construction of machine tools show a clear tendency to move away from cast iron structures to elements made of polymer concrete (PC)
The results showed that the replacement of styrene-butadiene rubber (SBR) latex and silica fume led to a significant increase in the mechanical properties and a reduction of the permeability of concrete mixtures
The results in the time and frequency domains have shown that the most favourable dynamic property results were obtained for the sample with the designation 90%PC10%SBR0.6O2
Summary
The damping of the vibrations of construction materials is one of the most important factors determining the dynamic properties of machines and has a significant impact on the machining capabilities of a machine tool.[1,2,3,4,5] The latest development trends in the construction of machine tools show a clear tendency to move away from cast iron structures to elements made of polymer concrete (PC). It was observed that in the case of both examined materials, the wear of the flank surface and the surface roughness after machining were much lower when a bed made of mineral cast was used Such results indicate the much more favourable dynamic properties of a machine tool equipped with a bed made of mineral cast. It was noticed that in both cases, much smaller vibration amplitudes occurred when a mineral cast bed was used.[13,14]
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