การศึกษาผลของการผสมต่อคุณสมบัติของยางมะตอยที่ปรับปรุงคุณภาพโดยยางธรรมชาติ

Effect of Mixing on Dispersion and Properties of Natural Rubber Modified Bitumen

Name: ธุมาวดี สิงหนิยม

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Polymer Modified Bitumen

; Natural Rubber Modified Bitumen

; Dispersion Mixing

Abstract: Nowadays, there are increasing interest to use natural rubber to modifybitumen instead of SBS or EVA. Unfortunately, the preliminary studies have foundthat the natural rubber modified bitumen cannot meet the specifications of polymermodified bitumen (PMB) of Highway Department. Therefore, this research was setup to study the effect of mixing conditions on dispersion and properties of naturalrubber modified bitumen. The research aimed to study the effect of mixing type(high shear and low shear mixing), mixing temperature, mixing time, and rubbercontent on dispersion and properties of the resultant blend. The properties ofconcerned in this study were penetration, softening point, ductility, andtoughnessltenacity. Ductility can be used to indicate the dispersion of the blend whilea variation of toughnessltenacity test can indicate the distribution of the blend.Furthermore, morphologies of the blends were observed by fluorescence microscopy.The experiment by the low shear mixer had to pre-melt the natural rubberbefore use because the low shear rate cannot break and disperse the rubber into thebitumen. From the results, the only property of the blends that has been improvedwas ductility while other properties were worse than the original properties of thebitumen. Similar results are obtained for the blends prepared with pre-melt rubberand using the high shear mixer. Micrographs of the blends could not see any rubberparticles in the bitumen, indicating that the compatibility of the bitumen and the premeltnatural rubber was quite good. This suggested that the fully dispersed rubber,with fully extended chain and not crosslinked, acted as a plasticizer softens bitumen,rather than providing reinforcement.From the results of high shear mixing without pre-melting rubber, theblend properties were improved in general. From analyzing the micrographs, therubber particle sizes ranged from 0.6 to I .6 microns for 5 percent and 10 percentrubber contents. Furthermore, it seems that the rubber content mainly affected themorphology and the different morphology provided the different degrees ofimprovement in the blend properties. The relationship between the dispersion and theblend properties were shown in terms of the relationship between ductility andtoughnessltenacity. The curves for 5 percent rubber were quite conclusive, showingthat an increase in dispersion slightly improves toughnessltenacity. However, therelationship between mixing conditions and dispersion cannot be concluded since themixing conditions could not be well controlled due to equipment and materiallimitations.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Dr.Jonathan H. Chan

Role: Supervisor

Created: 2544

Issued: 2005-10-26

Modified: 2006-05-24

วิทยานิพนธ์/Thesis

ISBN: 9749551338

CallNumber: CHE1285

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: วิศวกรรมเคมี

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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