IHydroxypropyl methylcellulose (HPMC) idlala kakhulu indima yokugcina amanzi, ukujiya kanye nokwenza ngcono ukusebenza kokwakhiwa kusimende, igypsum nezinye izinto eziyimpuphu. Ukusebenza kahle kokugcinwa kwamanzi kungavimbela ngokuphumelelayo i-powder ekumisweni nasekuqhekekeni ngenxa yokulahlekelwa kwamanzi amaningi, futhi wenze i-powder ibe nesikhathi eside sokwakha.
Khetha izinto zikasimende, izilinganiso, izilinganiso, izinto ezigcina amanzi, izibophezelo, izilungisi zokusebenza kwesakhiwo, njll. Isibonelo, udaka olusekelwe ku-gypsum lusebenza kangcono kunodaka olusekelwe kusimende esimweni esomile, kodwa ukusebenza kwalo kwebhondi kuyehla. ngokushesha ngaphansi kwesimo sokumunca umswakama nokumuncwa kwamanzi. Amandla okubopha okuqondiwe odaka lokuplastwa kufanele ancishiswe ungqimba ngongqimba, okungukuthi, amandla okubopha phakathi kwesendlalelo sesisekelo kanye ne-ejenti yokwelapha yesixhumi esibonakalayo ≥ amandla okubopha phakathi kodaka longqimba oluyisisekelo kanye ne-ejenti yokwelapha yesixhumi esibonakalayo ≥ isibopho phakathi kwesisekelo udaka lwezingqimba kanye nodaka longqimba lwangaphezulu Amandla ≥ amandla okubopha phakathi kodaka olungaphezulu nodaka lwe-putty.
Umgomo ofanelekile we-hydration we-cement mortar esisekelweni ukuthi umkhiqizo we-cement hydration uthatha amanzi kanye nesisekelo, ungena esisekelweni, futhi wenze "uxhumano oluyinhloko" oluphumelelayo nesisekelo, ukuze kuzuzwe amandla esibopho adingekayo. Ukunisela ngokuqondile phezu kwesisekelo kuzodala ukuhlakazeka okukhulu ekumunceni kwamanzi kwesisekelo ngenxa yokuhluka kwezinga lokushisa, isikhathi sokunisela, nokufana kokunisela. Isisekelo sinokumuncwa okuncane kwamanzi futhi sizoqhubeka nokumunca amanzi osimende. Ngaphambi kokuqhubeka kwe-cement hydration, amanzi adonswa, okuthinta i-samente hydration kanye nokungena kwemikhiqizo ye-hydration ku-matrix; isisekelo sinokumuncwa okukhulu kwamanzi, futhi amanzi odaka agelezela esisekelweni. Ijubane eliphakathi lokufuduka lihamba kancane, futhi ngisho nongqimba olunothile ngamanzi luyakhiwa phakathi kodaka kanye ne-matrix, okuphinde kuthinte amandla esibopho. Ngakho-ke, ukusebenzisa indlela evamile yokunisela isisekelo ngeke nje kuhluleke ukuxazulula ngokuphumelelayo inkinga yokumuncwa kwamanzi amaningi kwesisekelo sodonga, kodwa kuzothinta amandla okubopha phakathi kodaka nesisekelo, okuholela ekubhobozeni nasekuqhekekeni.
Umthelela we-cellulose ether kumandla okucindezela noshear odaka lukasimende.
Ngokungezwa kwe-cellulose ether, amandla okucindezela kanye ne-shear ayancipha, ngoba i-cellulose ether ithatha amanzi futhi ikhulise i-porosity.
Ukusebenza kwesibopho namandla okubopha kuncike ekutheni isixhumi esibonakalayo phakathi kodaka nezinto eziyisisekelo singabonakala ngokuzinza nangempumelelo "ukuxhumana okubalulekile" isikhathi eside.
Izinto ezithinta amandla ebhondi zihlanganisa:
1. Izici zokumuncwa kwamanzi kanye nokuqina kwesixhumi esibonakalayo se-substrate.
2. Amandla okugcina amanzi, amandla okungena namandla esakhiwo sodaka.
3. Amathuluzi okwakha, izindlela zokwakha kanye nendawo yokwakha.
Ngenxa yokuthi ungqimba oluyisisekelo lokwakhiwa kodaka lunokumuncwa okuthile kwamanzi, ngemva kokuba ungqimba lwesisekelo lumunca amanzi odakeni, ukwakheka kodaka kuzowohloka, futhi ezimeni ezinzima, izinto zikasimende osikeni ngeke zigcwaliswe amanzi ngokugcwele, okuzoholela ekubeni. ngamandla, akhethekile Isizathu siwukuthi amandla esixhumi esibonakalayo phakathi kodaka oluqinile kanye nesendlalelo sesisekelo siba ngaphansi, okwenza udaka luqhekeke futhi liwe. Isixazululo sendabuko salezi zinkinga ukunisela isisekelo, kodwa akunakwenzeka ukuqinisekisa ukuthi isisekelo siswakanyiswe ngokulinganayo.
Isikhathi sokuthumela: May-06-2023