Effect of different montmorillonites on rheological properties of bitumen/clay nanocomposites

Abstract

Different composites of organomodified montmorillonite (OMMT)/bitumen were prepared by melt blending with hexadecyl dimethyl benzyl ammonium modified montmorillonite (HBM) and double octadecyl dimethyl ammonium modified montmorillonite (DOM). The structures of two kinds of montmorillonite modified bitumen were characterized by X-ray diffraction (XRD). The effects of different montmorillonites on the dynamic rheological properties of the modified bitumens were investigated by dynamic shear rheometer (DSR). The XRD results show that DOM modified bitumen forms an intercalated structure, whereas the HBM modified bitumen forms an exfoliated structure. DSR results indicate that OMMT modified bitumens exhibit higher complex modulus, lower phase angle than pristine bitumen, which means that the resistance to rutting at high temperatures of pristine bitumen is improved due to the introduction of OMMT. Compared with DOM modified bitumen, HBM modified bitumen shows better rutting resistance, which is contributed to the formation of exfoliated structure in HBM modified bitumen.

Keywords

nanocomposites / modified bitumen / montmorillonite / rheological property

References

[1] AhmedR., NehalS.. Nanocomposite materials pristined on polyurethane intercalated into montmorillonite clay [J]. Mater Sci Eng A, 2005, 399: 368-376

[2] AkelahA., KellyP., QutubuddinS., et al.. Synthesis and characterization of epoxyphilic montmorillonites [J]. Clay Minerals, 1994, 29: 169-178

[3] GultekA., SeckinT., OnalY., IcduyguM. G.. Preparation and phenol captivating properties of polyvinylpyrrolidone-montmorillonite hybrid materials [J]. J Appl Polym Sci, 2001, 81: 512-519

[4] ZilgC., DietscheF., HoffmannB., DietrichC., MulhauptR.. Nanofillers pristined upon organophilic layered silicates [J]. Macromol Symp, 2001, 169: 65-77

[5] TienY.-i., WeiK.-hwa.. The effect of nano-sized silicate layers from montmorillonite on glass transition, dynamic mechanical and thermal degradation properties of segmented polyurethane [J]. J Appl Polym Sci, 2002, 86: 1741-1748

[6] WanjaleS. D., JogJ. P.. Effect of modified layered silicates and compatibilizer on properties of PMP/clay nanocomposites [J]. J Appl Polym Sci, 2003, 90: 3233-3238

[7] WhiteoakD.Shell bitumen handbook [M], 1990, Shell Bitumen, Riversdell Hause, Surrey

[8] AoN.-j., WangQ., ZhangA.-min.. Asphalt modified by SBS [J]. China Synthetic Rubber Industry, 2003, 26(2): 65-69

[9] CollinsJ. H., BouldinM. G., GellesR., BerkerA.. Improved performance of paving grade asphalts by polymer modification [J]. J Assoc Asphalt Paving Technol, 1991, 60: 43-79

[10] PolaccoaG., BerlincioniaS., BiondiaD., StastnabJ., ZanzottoL.. Asphalt modification with different polyethylene-based polymers [J]. Eur Polym J, 2005, 41: 2831-2844

[11] YEH Pei-hung, NIEN Yu-hsun, CHEN Jean-hong, CHEN Wei-chyum, CHEN Jian-shiuh. Thermal and rheological properties of maleated polypropylene modified asphalt [J]. Polym Eng Sci, 2005: 1152–1158.

[12] YuJ.-y., ZengX., WuS.-peng.. Preparation and properties of montmorillonite modified asphalts [J]. Mat Sci Eng A, 2007, 47(1/2): 233-238

[13] PetersenR. E., AndersonD. A., ButtonJ. W.Strategic Highway Research Program, Binder characterization and evaluation, Volume 3: Physical Characterization [R], 1994, Washington, SHRP-A-369, National Research Council

[14] OuyangC.-f., WangS.-f., ZhangY., ZhangY.-xi.. Thermo-rheological properties and storage stability of SEBS/kaolinite clay compound modified asphalts [J]. Eur Polym J, 2006, 42(2): 446-457

[15] PetersenR. E., AndersonD. A., ButtonJ. W.Strategic Highway Research Program, Binder characterization and evaluation, Volume 4: Test methods [R], 1994, Washington, SHRP-A-370, National Research Council