Ku-mortar exutshwe kakade, inqobo nje uma i-cellulose ether encane ingathuthukisa kakhulu ukusebenza kwe-mortar emanzi, kungabonakala ukuthi i-cellulose ether iyisengezo esiyinhloko esithinta ukusebenza kokwakhiwa kwe-mortar.
Ukukhethwa kwezinhlobo ezahlukene, ukuqina okuhlukile, ubukhulu bezinhlayiya ezahlukene, amazinga ahlukene e-viscosity kanye nokwengezwa kwama-ether e-cellulose nakho kunemiphumela ehlukene ekuthuthukisweni kokusebenza kodaka oluyimpuphu eyomile. Njengamanje, izimbotshana eziningi zobumba kanye noplasta zinokusebenza okungekuhle kokugcina amanzi, futhi udaka lwamanzi luzohlukana ngemva kwemizuzu embalwa yokuma, ngakho-ke kubaluleke kakhulu ukwengeza i-ether ye-cellulose kudaka lukasimende.
Ake sibheke kabanzi indima ye-cellulose ether ku-cement mortar!
1. I-cellulose ether – ukugcinwa kwamanzi
Ukugcinwa kwamanzi kuwukusebenza okubalulekile kwe-methyl cellulose ether, futhi kungukusebenza okuqashelwa abakhiqizi abaningi be-dry-mix mortar basekhaya, ikakhulukazi labo abasezindaweni eziseningizimu ezinamazinga okushisa aphezulu. Ekukhiqizweni kwezinto zokwakha, ikakhulukazi i-dry powder mortar, i-cellulose ether idlala indima engenakuphikwa, ikakhulukazi ekukhiqizweni kwe-special mortar (modified mortar), iyinto ebalulekile futhi ebalulekile.
I-viscosity, umthamo, izinga lokushisa elizungezile kanye nesakhiwo sama-molecule se-cellulose ether kunethonya elikhulu ekusebenzeni kwayo kokugcinwa kwamanzi. Ngaphansi kwezimo ezifanayo, lapho i-viscosity ye-cellulose ether inkulu, ukugcinwa kwamanzi kuba ngcono; lapho umthamo uphakeme, ukugcinwa kwamanzi kuba ngcono. Ngokuvamile, inani elincane le-cellulose ether lingathuthukisa kakhulu ukugcinwa kwamanzi kwe-mortar. Lapho umthamo ufinyelela ku-isilinganiso esithile Lapho izinga lokugcinwa kwamanzi landa, umkhuba wezinga lokugcinwa kwamanzi uyehla; lapho izinga lokushisa elizungezile likhuphuka, ukugcinwa kwamanzi kwe-cellulose ether kuvame ukwehla, kodwa amanye ama-cellulose ether aguquliwe nawo anokugcinwa kwamanzi okungcono ngaphansi kwezimo zokushisa okuphezulu; imicu enezinga eliphansi lokushintshaniswa kwe-Vegan ether inokusebenza okungcono kokugcinwa kwamanzi.
Iqembu le-hydroxyl elise-molecule ye-cellulose ether kanye ne-athomu ye-oxygen ebond ye-ether kuzohlangana ne-molecule yamanzi ukuze kwakheke i-hydrogen bond, kuguqule amanzi akhululekile abe ngamanzi aboshwe, ngaleyo ndlela kudlala indima enhle ekugcinweni kwamanzi; i-molecule yamanzi kanye ne-cellulose ether molecular chain Interdiffusion ivumela ama-molecule amanzi ukuthi angene ngaphakathi kwe-cellulose ether macromolecular chain futhi angaphansi kwamandla aqinile okubopha, ngaleyo ndlela akhe amanzi akhululekile, amanzi aboshwe, futhi athuthukise ukugcinwa kwamanzi kwe-cement slurry; i-cellulose ether ithuthukisa i-cement slurry entsha Izakhiwo ze-rheological, isakhiwo senethiwekhi enezimbobo kanye nengcindezi ye-osmotic noma izakhiwo zokwakha ifilimu ze-cellulose ether zivimbela ukusabalala kwamanzi.
2. I-Cellulose ether – ukuqina kanye ne-thixotropy
I-cellulose ether inika i-mortar emanzi i-viscosity enhle kakhulu, engakhulisa kakhulu ikhono lokubopha phakathi kwe-mortar emanzi kanye nesendlalelo sesisekelo, futhi ithuthukise ukusebenza kwe-mortar evimbela ukugoba. Isetshenziswa kabanzi ekuplasteni i-mortar, i-mortar ebopha izitini kanye nohlelo lokuvikela udonga lwangaphandle. Umphumela wokujiya we-cellulose ether ungakhulisa nekhono lokulwa nokuhlakazeka kanye nokulingana kwezinto ezisanda kuhlanganiswa, ukuvimbela ukuhlukaniswa kwezinto, ukuhlukaniswa kanye nokopha, futhi ingasetshenziswa kukhonkolo yefayibha, kukhonkolo engaphansi kwamanzi kanye nakonkolonkolo oyazicindezelayo.
Umphumela wokujiya kwe-cellulose ether ezintweni ezisekelwe kusimende uvela ekujiya kwesisombululo se-cellulose ether. Ngaphansi kwezimo ezifanayo, lapho i-viscosity ye-cellulose ether iphakeme, i-viscosity yezinto ezisekelwe kusimende eziguquliwe iba ngcono, kodwa uma i-viscosity iphezulu kakhulu, izothinta ukujiya nokusebenza kwezinto (njengokunamathisela ummese wokuplasta). I-mortar ezilinganisayo kanye ne-concrete ezizihlanganisayo, ezidinga ukujiya okuphezulu, zidinga ukujiya okuphansi kwe-cellulose ether. Ngaphezu kwalokho, umphumela wokujiya we-cellulose ether uzokwandisa isidingo samanzi sezinto ezisekelwe kusimende futhi wandise isivuno se-mortar.
Isixazululo samanzi se-cellulose ether esine-viscosity ephezulu sine-thixotropy ephezulu, okuyisici esiyinhloko se-cellulose ether. Izixazululo zamanzi ze-methyl cellulose zivame ukuba ne-pseudoplastic kanye ne-non-thixotropic fluidity ngaphansi kokushisa kwejeli yayo, kodwa zibonisa uketshezi lwe-Newtonian ngamanani aphansi okushefa. I-pseudoplasticity iyanda ngesisindo sama-molecule noma ukuhlushwa kwe-cellulose ether, kungakhathaliseki uhlobo lwe-substituent kanye nezinga lokufakwa esikhundleni. Ngakho-ke, ama-cellulose ethers ebanga elifanayo le-viscosity, kungakhathaliseki ukuthi i-MC, i-HPMC, i-HEMC, azohlala ebonisa izakhiwo ezifanayo ze-rheological inqobo nje uma ukuhlushwa kanye nokushisa kugcinwa kungaguquguquki. Ama-gel esakhiwo akhiwa lapho izinga lokushisa liphakanyiswa, futhi kwenzeka ukugeleza kwe-thixotropic ephezulu.
Ama-ether e-cellulose anezinga eliphezulu kanye nezinga eliphansi le-viscosity abonisa i-thixotropy ngisho nangaphansi kwezinga lokushisa lejeli. Lesi sici siwusizo olukhulu ekulungisweni kokulevelisha nokugoba ekwakhiweni kwe-mortar yokwakha. Kudingeka kuchazwe lapha ukuthi uma i-viscosity ye-cellulose ether iphakeme, ukugcinwa kwamanzi kungcono, kodwa uma i-viscosity iphakeme, isisindo sama-molecule se-cellulose ether siphakeme, kanye nokwehla okuhambisanayo kokuncibilika kwayo, okunomthelela omubi ekugxilweni kwe-mortar kanye nokusebenza kokwakhiwa.
3. Umphumela wokungenisa umoya we-cellulose ether
I-Cellulose ether inomphumela osobala wokungenisa umoya ezintweni ezintsha ezisekelwe kusimende. I-Cellulose ether inamaqembu athanda amanzi (amaqembu e-hydroxyl, amaqembu e-ether) kanye namaqembu athanda amanzi (amaqembu e-methyl, amasongo e-glucose), futhi iyi-surfactant enomsebenzi wobuso, ngaleyo ndlela inomphumela wokungenisa umoya. Umphumela wokungenisa umoya we-cellulose ether uzokhiqiza umphumela "webhola", ongathuthukisa ukusebenza kwezinto ezisanda kuhlanganiswa, njengokwandisa i-plasticity kanye nokushelela kwe-mortar ngesikhathi sokusebenza, okusiza ekusabalaleni kwe-mortar; izophinde ikhulise umkhiqizo we-mortar, inciphise izindleko zokukhiqiza i-mortar; kodwa izokwandisa i-porosity yezinto eziqinile futhi inciphise izakhiwo zayo zemishini njengamandla kanye ne-elastic modulus.
Njenge-surfactant, i-cellulose ether nayo inomphumela wokumanzisa noma wokugcoba ezinhlayiyeni zesimende, okwandisa ukugeleza kwezinto ezisekelwe kusimende kanye nomphumela wayo wokungenisa umoya, kodwa umphumela wayo wokuqina uzonciphisa ukugeleza. Umphumela wokugeleza uwukuhlanganiswa kwemiphumela yokwenza ipulasitiki kanye nokuqina. Ngokuvamile, lapho okuqukethwe kwe-cellulose ether kuphansi kakhulu, ukusebenza okuyinhloko ukwenziwa ipulasitiki noma ukunciphisa amanzi; lapho okuqukethwe kuphakeme, umphumela wokuqina we-cellulose ether uyanda ngokushesha, futhi umphumela wayo wokungenisa umoya uvame ukugcwala. Ngakho-ke kubonakala njengomphumela wokuqina noma ukwanda kwesidingo samanzi.
4. I-Cellulose ether - umphumela wokulibazisa
I-cellulose ether izokwandisa isikhathi sokubeka i-cement paste noma i-mortar, futhi ilibazise i-hydration kinetics ye-cement, okuwusizo ekuthuthukiseni isikhathi sokusebenza kwezinto ezisanda kuhlanganiswa, ukuthuthukisa ukuhambisana kwe-mortar kanye nokulahlekelwa ukuwohloka kwekhonkrithi ngokuhamba kwesikhathi, kodwa futhi kungabangela ukubambezeleka kwenqubekela phambili yokwakha.
Isikhathi sokuthunyelwe: Juni-02-2023