preview

Essay On Tyre Derived Aggregate

Decent Essays

The use of tyre- derived aggregate (TDA) was also tested as an aggregate for light rail ballast tracks in the sub ballast layer due to its absorption of impact properties compared to soil. A study proved results revealed that TDA efficiency in terms of vibration reduction was in the range of 17–46 dB when the impact was applied to the ballast and it was in the ranges of 6–32 dB and 6–47 dB while impact locations were on the sleeper and rail, respectively. Overall, it was proven that TDA with the particle size of 5–50mm and thickness of 200mm reduced by 6–47 dB in vertical vibrations with the dominant frequency range of 32–63 Hz. Australian transport at the moment is years behind the development of other countries, therefore the government …show more content…

It was concluded that the 500mm thick TDA proved the best results and with an increase in thickness the decrease in frequency. Towers (2010) also conducted a field test in Denver. In his study on average, the TDA underlayment at Denver Regional Transportation District (RTD) provided ground-borne vibration reduction of about 3 dB between 25 and 31.5 Hz and 8–14 dB between 40 and 160 Hz. First we needed to test the optimal size for the TDA, with the use of Terzaghis equation (B) Ballast (SB) Subballast The TDA used in the construction section was of Type A (coarse TDA with the maximum size of 50mm for TDA layers with less than 1m thickness). For the proceeding experiments a 20mm thickness was used, as shown below Figure 4 is broken into 2 sections, one using a 20cm layer of TDA and the other without it. One of the most common methods for determining the dynamic features of structures is the IR test. In this test, structures are usually actuated by a hammer in one or more selected locations, and the response time history (displacement, velocity or acceleration) is recorded in many other defined positions. Point receivers would be placed at 2m, 4m, 6m and 8m from the centre of the track while impact would be directly to the track an footing at multiple points. According to the obtained results at all receiver points in the vicinity of the test track with sections A and B, it is obvious that

Get Access