Superplasticizer(I)

Umhla wokuThumela: 9, Meyi, 2022

(一) Ukuziqhelanisa nepolycarboxylate superplasticizer kunye nemathiriyeli yesamente:

Enyanisweni, kuye kwafunyaniswa ukubaPolycarboxylate Superplasticizerbaneengxaki ezicacileyo zokuziqhelanisa neesamente ezahlukeneyo kunye neentlobo ezahlukeneyo zemixube yeeminerali, kwaye ngamanye amaxesha zikhetha kakhulu. Ukulungelelanisa phakathi kwesamente kunyepolycarboxylate superplasticizer iya kuchatshazelwa zizinto ezininzi. Okufana nalokhu: amacandelo esamente, indawo ethile yomphezulu, umxholo we-alkali, umxholo wegypsum kunye neentlobo ngeentlobo zonke zinempembelelo ekuziqhelaniseniPolycarboxylate Superplasticizer.

Indawo yokugcwalisa yePolycarboxylate Superplasticizerngenxa yeesamente ezahlukeneyo zihluke, izinga lokunciphisa amanzi liyancitshiswa, ilahleko ye-slump yekhonkrithi iyanda, into eyenziwa "i-residue yebhontshisi yebhontshisi" ibonakala xa ikhonkrithi ingenayo i-slurry, kunye neengxaki zokuphuma kwegazi, i-sedimentation kunye nokwahlula, kunye nobunzima bokupompa. , Ukuvakalelwa kwi-dosage, ikhonkrithi ayikwazi ukuvulwa okanye ikhutshwe ngokugqithiseleyo. Umzekelo, umxholo wepolycarboxylate superplasticizer kuba isamente yi-1.8% (umxholo oqinileyo we-10%) ukuze ufumane imeko eyanelisayo, ngelixa isamente iB idinga ukuxutywa ne-2.2% ukufumana imeko engcono, kwaye ngamanye amaxesha xa idlula i-2.2% yedosi, umxube wekhonkrithi. uqhelene nokopha.

Okwangoku, ngokwemiqathango yokuguquguquka kwePolycarboxylate Superplasticizer, izisombululo zezi zilandelayo:

(1) Kwisiseko sokuqinisekisa ukomelela kwekhonkrithi, ngokulungelelanisa umlinganiselo wesanti, ubungakanani bomlinganiselo we-aggregate erhabaxa, kunye nokwandisa ubuninzi benkqubo yekhonkrithi eludaka;

(2) Utywala lukamama ludityaniswe ne-ether lipids kwaye idosi yonyuswa ngokufanelekileyo. Ngokuqhelekileyo, kucetyiswa ukuba i-ethers kunye ne-lipids 5: 5 ibe nefuthe elingcono, kwaye i-dosage kufuneka inyuswe nge-0.2%;

(3) Yongeza ngokufanelekileyo okanye utshintshe amacandelo ayo, sebenzisa i-air-entraining agents ezifana ne-SJ, i-Degussa DY, i-foam stabilizer AR, i-K12, ukwandisa umlinganiselo we-slump-retaining agents, sebenzisa i-sodium gluconate, iswekile, i-phosphate, i-ATMP, i-citric acid , isitashi esilungisiweyo kunye nezinye iiretarders ezidibeneyo, usebenzisa i-cellulose e-soluble, i-xanthan gum, i-dextrin, i-modified soluble thickener, okanye ukongeza "isulfure" okanye "i-alkali" kwikhonkrithi kunokuphuculwa;

(4) Guqula i-molecular structure ye-polycarboxylic acid, kwaye ulungelelanise amanye amacandelo kwinkqubo yokudibanisa ukulungelelanisa ukulungelelaniswa kwayo.

Kwii-admixtures, impembelelo ye-fly ash ngokucacileyo inkulu kunomgubo we-slag. Ngokuqhelekileyo, i-fly ash yodidi lokuqala ikwazi ukuguquguquka, ngelixa i-fly ash yebanga lesibini neyesithathu ithanda ukungahambelani, ngakumbi uthuthu lwempukane yebakala lesithathu. Xa umgangatho womlotha uhlwempuzekile, umphumo wokunyusa umthamo wepolycarboxylate superplasticizerekuhambeni kwexesha nangoku ayinakuphuculwa kakhulu. Isizathu esona sizathu salo mcimbi kukuba umxholo wekhabhoni we-ash yesibini kunye ne-tertiary fly ash kunye nelahleko ephezulu yokutshisa ikhulu, kwaye umthamo we-adsorption we-carbon particles to admixtures mkhulu, ngaloo ndlela unciphisa ukuxutywa kwe-admixtures kwi-samente, echaphazela i-Concrete fluidity. Xa usebenzisa i-grade III fly ash, ukwandisa umxholo we-polycarboxylate water reducer ngaphezu kwe-50%, ukuze ufezekise izinga lokunciphisa amanzi xa udibanisa i-grade one fly ash. Ebusweni banamhlanje umlotha wempukane kunye nomgangatho onzima kunye namacandelo ahlukeneyo, kuyimfuneko ukomeleza umgangatho wokulawula uthuthu lwempukane kunye nokomeleza uvavanyo xa usebenzisa. polycarboxylate superplasticizer.