Tsiku Lotumiza:5,Mayi,2022

Pamene simenti imasakanizidwa ndi madzi, chifukwa cha kukopana pakati pa mamolekyu a simenti, kugunda kwa kutentha kwa tinthu tating'ono ta simenti mu yankho, zotsutsana ndi mchere wa simenti panthawi ya hydration, ndi mgwirizano wina wa madzi osungunuka. filimu pambuyo mchere simenti ndi hydrated. kuphatikiza, kotero kuti simenti slurry kupanga flocculation dongosolo. Kuchuluka kwa madzi osonkhezera kumakulungidwa mu dongosolo la flocculation, kotero kuti pamwamba pa tinthu tating'ono ta simenti sitingathe kukumana ndi madzi, zomwe zimapangitsa kuwonjezeka kwa madzi ndi kulephera kukwaniritsa zofunikira zomanga.

Pambuyo powonjezera superplasticizer, gulu la hydrophobic la molekyulu ya superplasticizer yoyipiridwayo imayikidwa pamwamba pa tinthu tating'onoting'ono, ndipo gulu la hydrophilic limaloza njira yamadzimadzi, ndikupanga filimu yowonera pamwamba pa tinthu tating'ono, kotero kuti pamwamba wa tinthu ta simenti ali ndi mtengo womwewo. Pansi pakuchitapo kanthu kwa magetsi, tinthu tating'ono ta simenti timasiyanitsidwa, ndipo mawonekedwe a flocculation a slurry simenti amasokonekera. Kumbali imodzi, madzi aulere mu flocculation dongosolo la simenti slurry amamasulidwa, amene kumawonjezera kukhudzana pamwamba pakati pa simenti particles ndi madzi, potero kuonjezera fluidity wa osakaniza; Komanso, kutsetsereka pakati pa simenti particles kumawonjezeranso chifukwa cha thickening wa solvated madzi filimu anapanga pamwamba pa simenti particles. Iyi ndi mfundo yakuti zochepetsera madzi zimachepetsa kumwa madzi chifukwa cha kutsekemera, kufalikira, kunyowetsa ndi kudzoza.

Mfundo Yachidule: Mwachidule, wochepetsera madzi nthawi zambiri amakhala surfactant kuti adsorbs pamwamba pa simenti particles, kupanga particles kusonyeza mphamvu zamagetsi. Tinthu tating'onoting'ono timathamangitsana chifukwa cha magetsi omwewo, kotero kuti tinthu tating'ono ta simenti timabalalika, ndipo madzi ochulukirapo pakati pa particles amamasulidwa kuti achepetse madzi. Komano, pambuyo powonjezera madzi kuchepetsa wothandizira, ndi adsorption filimu aumbike pamwamba pa simenti particles, amene amakhudza hydration liwiro la simenti, kumapangitsa kristalo kukula kwa simenti slurry wangwiro, dongosolo maukonde ndi zambiri. wandiweyani, ndikuwonjezera mphamvu ndi kachulukidwe kachulukidwe ka simenti.

Pamene kugwa kwa konkire kumakhala kofanana, kusakaniza komwe kungachepetse kumwa madzi kumatchedwa konkriti madzi ochepetsera. Njira yochepetsera madzi imagawidwa m'magulu ochepetsera madzi wamba komanso wochepetsera kwambiri madzi. Amene ali ndi mlingo wochepetsera madzi wochepera kapena wofanana ndi 8% amatchedwa ochepetsera madzi wamba, ndipo omwe ali ndi mlingo wochepetsera madzi oposa 8% amatchedwa ochepetsera madzi amphamvu kwambiri. Malingana ndi zotsatira zosiyana zomwe superplasticizers zingabweretse ku konkire, zimagawidwa m'mayambiriro amphamvu kwambiri komanso ma air-entraining superplasticizers.

Poyambitsa ntchito yowonjezeretsa madzi ochepetsera ku machiritso osindikizira, timamvetsetsa bwino vuto la kuwonjezera chochepetsera madzi pomanga chosindikizira chosindikizira. M'mawu osavuta, ntchito ya madzi kuchepetsa wothandizila ndi pamwamba yogwira wothandizila, amene angapangitse particles simenti kupereka elekitirodi yemweyo, ndi kumasula madzi pakati pa tinthu tating'onoting'ono mwa thupi katundu wa chinyawu chomwecho, potero kuchepetsa madzi.