Umhla wokuPoswa:5,UCanzibe,2022

Xa i-samente ixutywe namanzi, ngenxa yokutsalana phakathi kweemolekyuli zesamente, ukungqubana kwentshukumo ye-thermal yamasuntswana esamente kwisisombululo, imirhumo echaseneyo yeeminerali zesamente ngexesha lenkqubo ye-hydration, kunye nombutho othile wamanzi anyibilikisiweyo. ifilimu emva kokuba iiminerali zesamente zifakwe emanzini. kudityaniswe, ukwenzela ukuba i-samente slurry yenza isakhiwo se-flocculation. Isixa esikhulu samanzi ashukumisayo sihlanganiswe kwisakhiwo se-flocculation, ukwenzela ukuba umphezulu weengqungquthela zesamente awukwazi ukudibanisa ngokupheleleyo namanzi, okubangelwa ukwanda kokusetyenziswa kwamanzi kunye nokungaphumeleli ukuphumeza umsebenzi wokwakha ofunekayo.

Emva kokongeza i-superplasticizer, iqela le-hydrophobic ye-molecule ye-superplasticizer ehlawulisiweyo ibhengezwa ngokuthe ngqo kumphezulu weqhekeza le-samente, kwaye iqela le-hydrophilic likhomba kwisisombululo esinamanzi, lenza ifilimu ye-adsorption ebusweni beqhekeza le-samente, ukwenzela ukuba umphezulu we-samente ube phezulu. yesuntswana lesamente inentlawulo efanayo. Ngaphantsi kwesenzo sokunyanzeliswa kombane, iinqununu ze-samente zihlukaniswe omnye komnye, kwaye isakhiwo se-flocculation ye-cement slurry sichithwa. Ngakolunye uhlangothi, amanzi akhululekile kwisakhiwo se-flocculation ye-sement slurry ikhululiwe, eyandisa indawo yoqhagamshelwano phakathi kwamasuntswana e-samente kunye namanzi, ngaloo ndlela ikwandisa ubuninzi bomxube; Ngaphezu koko, i-slippage phakathi kweengqungquthela ze-samente iphinda inyuke ngenxa yokuqina kwefilimu yamanzi edibeneyo eyenziwe phezu kweengqungquthela zesamente. Lo ngumgaqo wokuba ii-arhente zokunciphisa amanzi zinciphisa ukusetyenziswa kwamanzi ngenxa ye-adsorption, ukusabalalisa, ukumanzisa kunye nokuthambisa.

Umgaqo: Ngamafutshane, i-agent yokunciphisa amanzi idla ngokuba yi-surfactant ekhangayo phezu kwamaqhekeza e-samente, okwenza iinqununu zibonise iimpawu zombane. Iingqungquthela zigxotha omnye komnye ngenxa yentlawulo yombane efanayo, ukwenzela ukuba iinqununu ze-samente zihlakazwe, kwaye amanzi angaphezulu phakathi kweengqungquthela akhululwe ukunciphisa amanzi. Ngakolunye uhlangothi, emva kokongeza i-agent yokunciphisa amanzi, ifilimu ye-adsorption yenziwa kumphezulu wamasuntswana e-samente, echaphazela isantya se-hydration yesamente, yenza ukukhula kwekristale ye-cement slurry igqibelele ngakumbi, isakhiwo senethiwekhi singaphezulu. ixinene, kwaye iphucula amandla kunye nokuxinana kwesakhiwo sodaka lwesamente.

Xa i-concrete yekhonkrithi ifana ngokusisiseko, i-admixture enokunciphisa ukusetyenziswa kwamanzi ibizwa ngokuba yi-concrete water reducer. I-arhente yokunciphisa amanzi yahlulwe kwi-arhente yokunciphisa amanzi eqhelekileyo kunye ne-high-efficiency yokunciphisa amanzi. Abo banezinga lokunciphisa amanzi elingaphantsi okanye elilingana ne-8% babizwa ngokuba ngabanciphisi bamanzi abaqhelekileyo, kwaye abo banomlinganiselo wokunciphisa amanzi angaphezu kwe-8% babizwa ngokuba ngabanciphisi bamanzi asebenzayo. Ngokweempembelelo ezahlukeneyo ezinokuzisa i-superplasticizers kwikhonkrithi, zihlulwe zibe zi-superplasticizers zangaphambili kunye ne-air-entraining superplasticizers.

Ngokuzisa umsebenzi wokongeza i-ejenti yokunciphisa amanzi kwi-agent yokutywina, sinokuqonda ngokucacileyo ingxaki yokongeza i-arhente yokunciphisa amanzi ekwakhiweni kwe-agent yokunyanga. Ngamagama alula, indima ye-agent yokunciphisa amanzi yindawo esebenzayo, enokwenza ukuba iinqununu ze-samente zibonise i-electrode efanayo, kwaye zikhulule amanzi phakathi kweengqungquthela ngokusebenzisa iipropati ezibonakalayo ze-repulsion yentlawulo efanayo, ngaloo ndlela ukunciphisa amanzi.