gabatar
Hydroxypropyl methylcellulose (HPMC) shine ether cellulose wanda ake amfani dashi sosai a masana'antu daban-daban kamar abinci, magani, da gini azaman thickener, emulsifier, da stabilizer. A cikin masana'antar gine-gine, ana amfani da HPMC sau da yawa azaman ƙari ga kayan tushen siminti don cimma kaddarorin da ake so kamar iya aiki, riƙe ruwa da karko. Nazarin ya gano cewa ƙara HPMC zuwa kayan da aka dogara da siminti yana jinkirta tsarin samar da ruwa na siminti, a ƙarshe yana rinjayar ƙarfin haɓakar kayan da aka dogara da siminti.
Tasirin HPMC akan hydration na siminti
Ruwan siminti wani hadadden sinadari ne mai rikitarwa wanda ya hada da amsawar ruwa tare da busassun siminti. A lokacin aikin samar da ruwa, sassan siminti suna amsawa da ruwa don samar da samfuran ruwa daban-daban, waɗanda ke taimakawa haɓaka ƙarfin tushen siminti. Nazarin ya gano cewa ƙari na HPMC zuwa kayan da ake amfani da su na siminti zai iya jinkirta jinkirin siminti, ta yadda zai canza ƙima da girman ƙarfin haɓakawa.
Ɗaya daga cikin manyan dalilan da ke haifar da jinkirin jinkirin siminti shine kaddarorin ajiyar ruwa na HPMC. HPMC shine polymer hydrophilic wanda ke sha ruwa kuma yana kumbura don samar da tsari mai kama da gel. Lokacin da aka ƙara HPMC zuwa kayan da ke da siminti, yana shayar da ruwa daga gaurayawan, ta haka zai rage ruwan kyauta da ake buƙata don shayar da siminti. Wannan kuma yana rage jinkirin tsarin hydration, saboda amsawar siminti tare da ruwa yana buƙatar isasshen ruwa.
Wani abu da ke ba da gudummawa ga jinkirin ruwa na siminti shine adsorption na HPMC a saman sassan siminti. HPMC yana da babban kusanci ga barbashi na siminti saboda polarity. Ana iya sanya shi a saman sassan siminti kuma ya samar da shinge na jiki don iyakance hulɗar tsakanin kwayoyin ruwa da siminti. Wannan kuma yana rage jinkirin amsawar siminti da ruwa, yana haifar da jinkirin jinkirin siminti.
Bugu da kari na HPMC zuwa siminti-tushen kayan zai kuma shafi nucleation da crystal girma tsarin na hydration kayayyakin. Ruwan siminti ya haɗa da samuwar nau'ikan nau'ikan crystalline, kamar calcium silicate hydrate (CSH) da calcium hydroxide (CH). HPMC na iya hana haɓakar ƙwayar cuta da haɓakar kristal na wasu daga cikin waɗannan matakan, ƙara rage jin daɗin ciminti.
Tsarin ciminti hydration jinkiri
Hanya na farko da HPMC ke jinkirta hydration na siminti shine samuwar shinge ta jiki tsakanin siminti da ruwa. Lokacin da aka tarwatsa HPMC a cikin ruwa, yana samar da matrix mai kama da gel wanda zai iya tattara barbashi na siminti kuma ya rage samun ruwa kyauta don shayar da siminti. Wannan kuma yana rage jinkirin amsawar siminti tare da ruwa, yana haifar da jinkiri a cikin ƙarfin haɓakar abubuwan tushen siminti.
Wata hanyar ita ce adsorption na HPMC akan saman siminti. HPMC yana da babban kusanci ga barbashi na siminti saboda polarity. Ana iya sanya shi a saman sassan siminti kuma ya samar da shinge na jiki don iyakance hulɗar tsakanin kwayoyin ruwa da siminti. Wannan yana kara rage jinkirin amsawar siminti da ruwa.
Har ila yau, HPMC na iya yin hulɗa tare da sassa daban-daban na siminti, kamar su calcium ions, don haka ya shafi tsarin haɓaka da haɓakar haɓakar samfuran hydration. HPMC na iya hana haɓakar ƙwayar cuta da haɓakar kristal na wasu daga cikin waɗannan matakan, ƙara rage jin daɗin ciminti.
a karshe
Ƙarin HPMC zuwa kayan siminti na iya jinkirta jinkirin siminti, ta haka canza ƙimar da girman ƙarfin haɓaka. Hanyar jinkirin jinkirin ciminti ya fi girma saboda samuwar shinge ta jiki tsakanin simintin siminti da ruwa, wanda ke adsorbed a saman simintin siminti kuma yana hana haɓakar haɓakar haɓakar ƙwayoyin cuta da kristal na samfuran hydration. Fahimtar hanyoyin da HPMC ke hana ruwa siminti na iya ba mu damar haɓaka amfani da HPMC a cikin kayan siminti don samun abubuwan da ake so yayin kiyaye ƙarfin haɓaka kayan siminti.
Lokacin aikawa: Oktoba-24-2023