Idethi yokuthunyelwe:9,Jan,2023

Ziyini izinciphisi zamanzi?

Izinciphisi zamanzi (ezifana ne-Lignosulfonates) ziwuhlobo lwe-admixture engezwa kukhonkolo ngesikhathi sokuxuba. Izinciphisi zamanzi zinganciphisa okuqukethwe kwamanzi ngo-12-30% ngaphandle kokubeka engcupheni ukusebenza kukakhonkolo noma amandla emishini kakhonkolo (esivame ukuwaveza ngokwamandla okucindezela). Kuneminye imigomo yezinciphisi zamanzi, okungamaSuperplasticizers, plasticizers noma izinciphisi zamanzi ezisezingeni eliphezulu (HRWR).

Izinhlobo ze-Admixtures zokunciphisa amanzi

Kunezinhlobo eziningi zezingxube ezinciphisa amanzi. Izinkampani ezikhiqizayo zinikeza amagama ahlukene kanye nezigaba zalezi zixube ezifana nezivimbela amanzi, ama-densifiers, izinsiza zokusebenza, njll.

Ngokuvamile, singahlukanisa izinciphisi-manzi zibe izinhlobo ezintathu ngokokwakheka kwazo kwamakhemikhali (njengakuThebula 1):

i-lignosulfonates, i-hydroxycarboxylic acid, nama-polymers e-hydroxylated.

Ingabe i-Lignin ivela kuphi?

I-Lignin iyinto eyinkimbinkimbi emelela cishe amaphesenti angu-20 okwakhiwa kokhuni. Ngesikhathi senqubo yokukhiqizwa kwe-pulp yokwenza iphepha ngokhuni, uphuzo oludakayo lwakhiwa njengomkhiqizo oqukethe ingxube eyinkimbinkimbi yezinto, okubandakanya imikhiqizo yokubola ye-lignin ne-cellulose, imikhiqizo ye-sulfonation ye-lignin, ama-carbohydrate ahlukahlukene (ushukela) kanye i-sulfurous acid yamahhala noma ama-sulfate.

Okulandelayo kokungathathi hlangothi, imvula kanye nezinqubo zokuvutshelwa zikhiqiza izinhlobonhlobo zama-lignosulfonate wokuhlanzeka nokwakheka okuhlukahlukene kuye ngezici eziningana, njenge-alkali engathathi hlangothi, inqubo ye-pulping esetshenzisiwe, izinga lokuvutshelwa ngisho nohlobo neminyaka yokhuni olusetshenziswa njenge i-pulp feedstock.

I-Lignosulfonates njengama-water-reducers ku-Concrete

Idosi ye-Lignosulfonate superplasticizer ngokuvamile ingamaphesenti angu-0.25, okungaholela ekwehlisweni kwamanzi kuze kufike kumaphesenti angu-9 kuya kwangu-12 kokuqukethwe usimende (0.20-0.30%). Njengoba kusetshenziswe kumthamo ofanele, amandla okukhonkolo athuthuke ngo-15-20% uma kuqhathaniswa nokhonkolo oyinkomba. Amandla akhula ngamaphesenti angama-20 kuya kwangama-30 ngemva kwezinsuku ezi-3, ngamaphesenti angu-15-20 ngemva kwezinsuku ezingu-7, nangenani elifanayo ngemva kwezinsuku ezingu-28.

Ngaphandle kokushintsha amanzi, ukhonkolo ungageleza ngokukhululeka, okwenza kube lula ukusebenza ngawo (okungukuthi ukwandisa ukusebenza).

Ngokusebenzisa ithani elilodwa le-lignosulfonate superplasticizer powder esikhundleni sikasimende, ungase wonge amathani angu-30–40 kasimende kuyilapho ugcina ukuwohloka okufanayo kukakhonkolo, ukuqina, kanye nokhonkolo oyinkomba.

Esimweni esijwayelekile, ukhonkolo oxutshwe nale ejenti ungase ubambezele ukushisa okukhulu kwe-hydration ngamahora angaphezu kwamahlanu, isikhathi sokusetha sokugcina sikakhonkolo amahora angaphezu kwamathathu, kanye nesikhathi sokumisa sikakhonkolo amahora angaphezu kwamathathu uma kuqhathaniswa nokhonkolo oyinkomba. Lokhu kunenzuzo ekwakhiweni kwehlobo, ezokuthutha ukhonkolo wempahla, kanye nokhonkolo omkhulu.

I-Lignosulfonate superplasticizer ene-micro-entraining ingathuthukisa ukusebenza kukakhonkolo mayelana nokungafinyeleli yiqhwa.