SILVA, C. C. V. P.; http://lattes.cnpq.br/6240665626072633; SILVA, Conrado Cesar Vitorino Pereira da.
Resumo:
Warm asphalt mixtures are an important alternative for the paving development,
presenting a lower cost option, less environmental impacts and similar performance as
the hot mixtures. There are various types of substances which added to the asphalt
binder provide an reduction of the mixing and compaction temperature, what
characterizes a warm mixture. Between the main modifiers are the oilseeds, witch
reduces the temperature in about to 20°C in field applications. In this way, this research
aims to evaluate an modified asphalt binder with linseed oil in the contents of 1, 2, 3, 4,
5 and 6% of the asphalt weight using the Performance Grade (PG), MSCR and LAS
tests in the dynamic shear rheometer (DSR). Analyzing the results, it is verified that the
mixing temperature can be reduced in up to 15°C with the 6% linseed oil sample,
however the binder loses in its performance grade, supported traffic level and lifespan.
In the ideal modification content, 4% of linseed oil, a reduction of about 10,8°C in the
mixing temperature happens and the maximum PG temperature, 58°C, decreases only
one degree comparing to the pure binder, 64°C. In addition, this content of asphalt
binder presents the second largest lifespan of the studied contents, being classified by
the MSCR test as ideal for standard traffic. The linseed oil showed itself a good green
alternative for the production of warm mixtures, generating economy with the energetic
spendings and reducing the emissions of toxic smoke which are harmful to people and
the environment.