I-ether ye-Cellulose ibambezela inkqubo ye-cement hydration

I-Cellulose ether luhlobo lwe-organic polymer compound esetyenziswa ngokubanzi kwizinto zokwakha, ngakumbi kwizinto ezisekelwe kwi-samente. I-ether ye-cellulose inokulibazisa inkqubo ye-hydration ye-samente, ngaloo ndlela ilungelelanisa ukusebenza, ixesha lokubeka kunye nokuphuhliswa kwamandla kwangaphambili kwe-samente intlama.

(1). Ukulibazisa ukusabela kokufakwa kwamanzi
I-Cellulose ether inokulibazisa ukusabela kwe-hydration yesamente, ephunyezwa ikakhulu ngezi ndlela zilandelayo:

1.1 I-Adsorption kunye neziphumo zokukhusela
Isisombululo esiphezulu se-viscosity esenziwe ngokuchithwa kwe-cellulose ether kwisisombululo samanzi singenza ifilimu ye-adsorption ebusweni beengqungquthela zesamente. Ukuqulunqwa kwale filimu kubangelwa ubukhulu becala ngenxa ye-adsorption yomzimba yamaqela e-hydroxyl kwiimolekyuli ze-cellulose ether kunye ne-ion kumphezulu wamasuntswana e-samente, nto leyo ebangela ukuba umphezulu we-samente ukhuseleke, unciphisa uqhagamshelwano phakathi kwamasuntswana e-samente kunye neemolekyuli zamanzi, ngaloo ndlela. ukulibazisa ukusabela kwehydration.

1.2 Ukwenziwa kwefilimu
Kwinqanaba lokuqala le-cement hydration, i-cellulose ether inokwenza ifilimu edibeneyo phezu kwamaqhekeza e-samente. Ubukho beli filimu kuthintela ngokufanelekileyo ukusasazwa kwama-athomu zamanzi ngaphakathi kweengqungquthela ze-samente, ngaloo ndlela kulibazisa izinga le-hydration ye-samente. Ukongezelela, ukubunjwa kwale filimu kunokunciphisa ukuchithwa kunye nokusabalalisa i-calcium ions, ukulibazisa ngakumbi ukubunjwa kweemveliso ze-hydration.

1.3 Ukupheliswa kunye nokukhululwa kwamanzi
I-cellulose ether inokufunxa okuqinileyo kwamanzi, inokufunxa ukufuma kwaye ikhulule kancinci. Le nkqubo yokukhutshwa kwamanzi inokulungelelanisa umbane kunye nokusebenza kwe-sement slurry ukuya kwinqanaba elithile, kwaye icothise isantya sokuphendula ngokunciphisa ukuxinwa kwamanzi ngexesha lenkqubo yokuhambisa amanzi.

(2). Impembelelo yokwakheka kwesigaba sesamente
I-cellulose ethers ineempembelelo ezahlukeneyo kwi-hydration yezigaba ezahlukeneyo zesamente. Ngokuqhelekileyo, i-cellulose ether inempembelelo ecacileyo ngakumbi kwi-hydration ye-tricalcium silicate (C₃S). Ubukho be-cellulose ether buya kulibazisa ukuhanjiswa kwe-C₃S kunye nokunciphisa izinga lokukhululwa kobushushu bokuqala be-hydration ye-C₃S, ngaloo ndlela kulibazisa ukuphuhliswa kwamandla okuqala. Ukongezelela, i-cellulose ethers inokuchaphazela ukuhanjiswa kwamanye amacandelo amaminerali afana ne-dicalcium silicate (C₂S) kunye ne-tricalcium aluminate (C₃A), kodwa ezi ziphumo zincinci.

(3). I-Rheology kunye nefuthe lesakhiwo
I-ether ye-cellulose inokunyusa i-viscosity ye-samente slurry kwaye ichaphazele i-rheology yayo. I-viscosity slurry ephezulu inceda ukunciphisa ukulungiswa kunye ne-stratification yeengqungquthela zesamente, ukuvumela i-sement slurry ukuba igcine ukufana kakuhle ngaphambi kokumisela. Olu phawu oluphezulu lwe-viscosity alulibazisi kuphela inkqubo ye-hydration yesamente, kodwa luphucula ulwelo kunye nokusebenza kolwakhiwo lwe-cement slurry.

(4). Iziphumo zokusetyenziswa kunye nezilumkiso
I-cellulose ethers inefuthe elibalulekileyo ekubambezelekeni kwe-cement hydration kwaye ngoko ke ihlala isetyenziselwa ukulungelelanisa ixesha lokumisela kunye nobuninzi bezinto ezisekelwe kwi-samente. Nangona kunjalo, idosi kunye nohlobo lwe-ether ye-cellulose kufuneka ilawulwe ngokuchanekileyo, kuba i-ether ye-cellulose engaphezulu inokubangela iingxaki ezifana nokungonelanga kwamandla okuqala kunye nokunyuka kwe-shrinkage yezinto ezisekelwe kwi-samente. Ukongezelela, iintlobo ezahlukeneyo ze-cellulose ethers (ezifana ne-methylcellulose, i-hydroxypropylmethylcellulose, njl.) zineendlela ezahlukeneyo kunye nemiphumo kwi-sement slurries, kwaye kufuneka zikhethwe ngokweemfuno ezithile zesicelo.

Ukusetyenziswa kwe-cellulose ether kwizinto ezisekelwe kwi-samente akunakulibazisa kuphela ukusabela kwe-hydration ye-samente, kodwa nokuphucula ukusebenza kokwakhiwa kunye nokuqina kwezinto. Ngokukhetha okufanelekileyo kunye nokusetyenziswa kwe-cellulose ethers, umgangatho kunye nesiphumo sokwakhiwa kwezinto ezisekelwe kwi-samente kunokuphuculwa kakhulu.