Assessment of Compaction Temperatures on Hot Mix Asphalt (HMA) Properties

Hot Mix Asphalt (HMA) is one of the most commonest constructed asphalts in Iran and the quality control of constructed roads with HMA have been always paid due attention by researchers. The quality control of constructed roads with this method is being usually carried out by measuring volumetric parameters of HMA marshall samples. One of the important parameters that has a critical role in changing these volumetric parameters is compaction temperature; which as a result of its changing, volumetric parameters of Marshall Samples and subsequently constructed asphalt is encountered with variations. In this study, considering the necessity of preservation of the compaction temperature, the effect of various temperatures on Hot Mix Asphalt (HMA) samples properties has been evaluated. As well, to evaluate the effect of this parameter on different grading, two different grading (Top coat index grading and binder index grading) have been used and samples were compacted at 5 various temperatures (including 85°C, 100°C, 115°C, 130°C, 145°C and 160°C). In this case, some 78 Marshall Samples were made and each parameter (density, void, VFA, VMA, stability and Flow) was analyzed in separated figures. The final results indicate that the more the compaction temperature increases, the more the stability and VFA increases, while void decreases. Also, the results showed that with the increase of compaction temperature, the densities of samples increase, until the optimum temperature (this temperature in this study is 145°C) and after this temperature the density decreases. Details of the results have been come in full text

Keywords:

Compaction Temperature , HMA , Volumetric Parameters , Marshall Method