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Mechanical properties of asphalt mortar produced from waste wood chips

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Document pages: 10 pages

Abstract: The purpose of this study is to evaluate the use of waste stone sawdust filler and asphalt binder, and to compare the mechanical properties of waste stone filler asphalt mastic with those produced with typical limestone filler. Mastic was prepared with four volume ratios of filler and asphalt of asphalt binder: 0.05, 0.10, 0.20 and 0.30. Dynamic shear rheometer (DSR) strain controlled frequency scanning test is used to evaluate the performance of asphalt binder and mastic. The test is carried out over a wide temperature range: 10, 20, 30, 40, 50, 60 and 70 ° C using 10 constant strain and loading frequencies of 10, 5.6, 3.1, 1.78, 1.0, 0.56, 0.31, 0.178 and 0.1. The composite shear modulus () and the phase angle of the silo were measureder and the mastics. The findings of this study showed that the stone sawdust filler demonstrated higher resistance to fatigue and rutting behavior than the limestone filler. However, the elastic behavior of the two asphalt mastics was nearly similar and increased with the increase in volume ratio. It was also found that the best-fit model described the relationship between the volume ratio and each of and , and the mastic-to-binder modulus ratio was the exponential model with high coefficient of determination (). The differences in the value between the limestone filler and the stone sawdust filler were relatively insignificant particularly at low loading frequencies and high temperatures. Finally, the mastic-to-binder modulus ratio decreased with the increase in loading frequency.

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