I-HPMC ngamandla esimende sikasimende

I-Hydroxypropyl Methylcellulose (HPMC)iyi-non-ionic cellulose ether esetshenziswa kabanzi ezintweni zokwakha, ikakhulukazi ku-cement mortar. Idlala indima ebalulekile ekulawuleni ukusebenza kwe-mortar ngenxa yokugcina amanzi kahle, ukuqina, ukuthambisa kanye nezakhiwo zayo zokwakha ifilimu. Kodwa-ke, yize ukwengezwa kwe-HPMC kungathuthukisa ukusebenza kokwakhiwa kwe-mortar, kuzoba nomthelela othile emandleni e-cement mortar.

1. Izakhiwo eziyisisekelo kanye nendlela yokusebenza kwe-HPMC

I-HPMC iyinto ye-polymer encibilika emanzini elungiselelwe ngokungenisa ngamakhemikhali amaqembu e-methyl kanye ne-hydroxypropyl ku-cellulose yemvelo. Isakhiwo sayo sama-molecule siqukethe inani elikhulu lamaqembu aphilizayo, okwenza ukuthi yakhe isixazululo se-colloidal emanzini futhi inamandla amakhulu okuqina nokugcina amanzi.

Ku-samente mortar, i-HPMC idlala indima elandelayo kakhulu:

Ukugcinwa kwamanzi: I-HPMC inganciphisa kakhulu ukulahleka kwamanzi ku-mortar, ibambezele ukusabela kokumuncwa kwe-samente, futhi inikeze isikhathi esanele sokumuncwa kwe-samente.

Thuthukisa ukusebenza kahle: Thuthukisa ukusebenza komsebenzi wokwakha ngokuthuthukisa ukunamathela kanye nokugeleza kodaka.

Umphumela wokulibazisa: I-HPMC inomphumela othile wokulibazisa enqubweni yokumanzisa usimende ngoba ivimbela ukusabalala kwamanzi ngokushesha.

Umphumela wokwakha ifilimu: Kukhiwa ifilimu encane ngesikhathi senqubo yokomisa ukuze kuthuthukiswe ukumelana nokuqhekeka kanye nokuguquguquka kwe-mortar.

2. Umphumela we-HPMC emandleni kadaka

Nakuba ukwethulwa kwe-HPMC kuthuthukisa ukusebenza kokwakhiwa kwe-mortar, kunomthelela omubi emandleni okusebenza kwe-mortar (ikakhulukazi amandla okucindezela kanye namandla okuguquguquka). Kubonakala kakhulu kulezi zici ezilandelayo:

Ukuphuza ukusabela komswakama: Nakuba umphumela wokugcina amanzi we-HPMC usiza ekutholeni umswakama ogcwele esimeni sokuqala, ukugoqa kwayo phezu kwezinhlayiya zesimende kuzovimbela ukungena kwamanzi okuqhubekayo, ngaleyo ndlela kubambezele izinga lomswakama wesimende futhi kuholele ekuthuthukisweni kwamandla okuqala okuhamba kancane.

Ukwakheka kwamabhamuza: I-HPMC kulula ukuyingenisa umoya ngesikhathi senqubo yokuxuba, okuholela enanini elikhulu lamabhamuza amancane akhiwe ngaphakathi kwe-mortar. Lezi zikhala ziba ama-micropores ngemva kokuqina, okwenza buthaka ubuningi namandla e-mortar.

Ithonya kusilinganiso sokubopha amanzi: I-HPMC izothinta ukugeleza kwe-paste yesimende lapho imunca amanzi. Ukuze kufezwe ukugeleza okufanele ngesikhathi sokwakha, kungadingeka ukuthi kufakwe amanzi engeziwe, ngaleyo ndlela kwandiswe isilinganiso sokubopha amanzi futhi kuncishiswe amandla okugcina.

Ithonya ekwakhiweni kwemikhiqizo yokufuthwa kwesamente: I-HPMC ingase ihlangane neminye imikhiqizo yokufuthwa ngesikhathi senqubo yokufuthwa, ishintshe isimo sayo sekristalu kanye nokusatshalaliswa kwendawo, ngaleyo ndlela ithinte izakhiwo zemishini.

3. Ithonya lomthamo we-HPMC emandleni

Ithonya le-HPMC emandleni esihlabathi sikasimende libonisa ukujwayela okuthile:

Isilinganiso esiphansi (<0.1%): umthelela omncane emandleni, ikakhulukazi okuthuthukisa ukugcinwa kwamanzi nokusebenza kahle;

Umthamo ophakathi (0.1%~0.3%): ukusebenza kokwakhiwa kuthuthuke kakhulu, kodwa amandla aqala ukwehla;

Umthamo ophezulu (>0.3%): amandla ancishisiwe kakhulu, ikakhulukazi amandla okuqala ancishisiwe kakhulu, okungase kube yingozi enqubweni yokwakha kwasekuqaleni.

Ukulawula okunengqondo inani le-HPMC elingeziwe kuyisihluthulelo sokugcina amandla e-mortar ngenkathi kuqinisekiswa ukusebenza kahle kokwakhiwa.

4. Iziphakamiso zokwenza ngcono

Ukuze kulinganiswe ubudlelwano phakathi kokusebenza kokwakha kanye nezakhiwo zemishini, ukulungiswa kungenziwa kusukela kulezi zici ezilandelayo:

Lungiselela umthamo: Nquma umthamo we-HPMC ofanele ngokusebenzisa izivivinyo ukuqinisekisa ukusebenza kokwakhiwa nokunciphisa imiphumela emibi emandleni.

Izingxube ezihlanganisiwe: Sebenzisa izingxube ezingathuthukisa amandla, njenge-silica fume, i-fly ash kanye nezinye izingxube zamaminerali, ukuze uthuthukise ubuningi be-mortar.

Khetha imikhiqizo ye-HPMC ene-viscosity efanele: I-HPMC yamazinga ahlukene e-viscosity inemiphumela ehlukene ekusebenzeni kwe-mortar. I-viscosity ephezulu kakhulu ingase ikhulise ukwakheka kwamabhamuza, futhi i-viscosity ephakathi nendawo ikhuthaza kakhulu ibhalansi yokusebenza iyonke.

Lawula isilinganiso samanzi nosimende ngesikhathi sokwakha: Zama ukunciphisa amanzi engeziwe asetshenziswayo ngenxa yezidingo zokugeleza kwamanzi ukuze ugweme isilinganiso samanzi nosimende ngokweqile esithinta amandla.

I-HPMCinezinzuzo ezibalulekile ekuthuthukiseni ukusebenza kokwakhiwa kwe-samente mortar, kodwa umthelela wayo omubi emandleni e-samente, ikakhulukazi amandla okuqala, awunakushaywa indiva. Ukusetshenziswa okunengqondo kwe-HPMC, ukulawula umthamo wayo, kanye nokuhlanganiswa nezinye izindlela zokwenza ngcono kungaqinisekisa ukuthi amandla esakhiwo ahlangabezana nezidingo zobunjiniyela ngenkathi kuthuthukiswa ukusebenza kahle kokwakha. Ucwaningo lwesikhathi esizayo lungaqhubeka nokuhlola indlela yokusebenzisana kwe-HPMC nezinye izingxube ukuze kunikezwe isiqondiso sesayensi esengeziwe sokusetshenziswa kwayo ezintweni zokwakha.