Kana iyo bitumen viscosity yakakwirira, kuputika kwemvura kunopesana kwebhitumini kuchave kwakakura, spurting molding ichava duku, uye nhamba yekupindirana ichaderedzwa. Kuti ubvise dambudziko iri, nzira yakajairika ndeyekuwedzera dhayamita yemhino, asi izvi zvinongo dzikisa kukurumidza kwejeti yemvura, kunetesa "impact-splash-evening" mhedzisiro, uye kuita kuti kupinza kwemukati kusaenzane. Kuti uvandudze zviri nani hunyanzvi hwekugadzira asphalt kuvaka, maitiro easphalt anofanirwa kuvandudzwa.

Parizvino, kune mamwe marori anoparadzira bhitumini pamusika ane zvisingagutse permeability mhedzisiro uye anogona kunge ane yakachinjika kusaenzana muchikamu chepermeability. Yakajairika lateral kusaenzana ndiyo yakachinjika pateni yepermeability layer. Panguva ino, mamwe matanho anogona kutorwa kuti anyatso kuvandudza lateral kufanana kweasphalt layer. Iko kumhanya kweakangwara akangwara kuparadzira rori inongoda kuchinjwa mukati meiyo inoshanda renji, iyo isingazove nemhedzisiro pakufanana kwakamira kweasphalt layer. Nekuti kana iyo kumhanya ichikurumidza, huwandu hweasphalt inoputika panguva yeyuniti inova yakakura, asi huwandu hweasphalt hunopararira munzvimbo yese ye ??bhizinesi rinoramba risina kushanduka. Kuchinja kwekumhanya kune simba guru pakufanana kweparutivi.

Kana kureba kwepombi yekupfapfaidza kubva pasi kwakanyanyisa, kunoderedza simba rekupfapfaidza kwebhitumini uye kunetesa "impact splash-homogenization" mhedzisiro; kana kureba kwepombi yekupfapfaidza kubva pasi kwakanyanya kuderera, zvinoderedza kukanganiswa kwebhitumini yekupfapfaidza. Iyo inopindirana nhamba yekupenda fan inofanirwa kugadziridzwa zvinoenderana nemamiriro chaiwo ekuvandudza asphalt yekupfapfaidza maitiro.