Melting thiab boiling cov ntsiab lus ntawm asphalt: Vim li cas nws mos muag ntawm qhov kub thiab txias? ​​

Asphalt, ib txoj kab sib xyaw ua ke ntawm hydrocarbons, tsis muaj ib tug ntse melting point vim nws li heterogeneous muaj pes tsawg. Hloov chaw, nws ua rau cov khoom siv muag muag muag muag (feem ntau 40-60 ° C rau roj av asphalt), tshaj qhov uas nws hloov los ntawm cov khoom khov. Cov cwj pwm no los ntawm nws cov qauv colloidal:

Molecular dynamics: thaum cov roj kub, cov roj ua kua (maltenes) nyob rau hauv asphalt ua kua ntau, tsis muaj zog ntawm cov kua dej asphaltene matrix. Qhov no txo ​​cov zog sib xyaw, ua rau ua kom zoo nkauj.
Qhov kub thiab txias rhiab: asphalt tus viscosity drops exponentially nrog kub. Piv txwv li, ntawm 60 ° C, tus qauv Asber Asphalt yuav poob 90% ntawm nws lub pob tw, ua rau rutting hauv tsheb thauj khoom. Kev hloov Eralts (E.g.
Boiling thiab decomposition:
Asphalt decomposes ua ntej mus txog qhov tseeb boiling point (qis dua 470 ° C), tso pa roj lom xws li benzene. Yog li, boiling taw tes yog tsawg dua li flash point (~ 204 ° C), uas cov cim sib tshooj kev pheej hmoo thaum cua sov.

Cov tshuaj cuam tshuam:

Pavement swb: lub caij sov sov tshaj li 50 ° C tuaj yeem soquen asphalt, ua rau muaj kev cuam tshuam zoo li rutting.
Kev daws teeb meem: Siv hloov kho txoj hlua khi (piv txwv li, SBS) lossis txias ntxiv rau txhim kho high-kub stability.
Hauv cov ntsiab lus xaus, asphalt softens vim yog colloidal tawg thiab thermal ntxim nyiam, cov khoom siv nrhav tshaj plaws rau kev ua haujlwm tsis tu ncua.