Polymer modified bitumen is a binder obtained by the incorporation of various types of
polymers in bitumen using mechanical mixing or chemical reactions. There are several
factors affecting the properties of polymer modified bituminous composites such as / chemical composition of bitumen, kind of polymer and filler, compatibility of bitumen
and polymer, amount of bitumen, polymer and filler, particle size of filler and process
conditions.
The main objective of this study is to determine the effects of polymer type and
concentration on mechanical, thermal, properties and morphologies of bitumen based
composites. It was also aimed to determine the effect of process temperature on
mechanical and thermal properties of bituminous composites.
Bituminous composites were prepared by using Brabender Plastic Coder, PLV 151.
Mixing was made at two different temperatures (150 º / C and 180 º / C) at 60 rpm for 20
minutes.
Three different kinds of polymer and four different polymer concentrations were used
to understand the effect of polymer type and polymer concentration on bituminous
composites properties. Low density polyethylene (LDPE), styrene-butadiene-styrene
copolymer (SBS) and ethylene-vinyl-acetate (EVA) were chosen as polymer. The
compositions were adjusted as the polymer volumes were equal to 5%, 10%, 20% and
50% of bitumen volume.
According to the test results, addition of polymer increases the mechanical properties,
reduces the melt flow index and thermal conductivity values of bituminous composites.
Morphological analysis results show that, fibrillation occurs at tensile fractured
surfaces of composites which contain LDPE and EVA when the polymer concentration
reaches 20% of bitumen volume.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12607531/index.pdf |
| Date | 01 September 2006 |
| Creators | Dogan, Mehmet |
| Contributors | Bayramli, Erdal |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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