Cellulose ethers wani nau'i ne na mahadi na polymer na halitta wanda aka gyara daga cellulose na halitta. An fi amfani da su a cikin kayan gini, musamman a kayan da aka gina da siminti. Tasirin ether cellulose akan tsarin hydration na ciminti ya fi nunawa a cikin abubuwan da suka biyo baya: rarrabuwar simintin siminti, riƙewar ruwa, tasirin sakamako mai ƙarfi, da tasiri akan ilimin halittar jiki da ƙarfin haɓaka samfuran siminti.
1. Gabatarwa ga ciminti hydration
Tsarin hydration na siminti jerin hadadden halayen jiki da sinadarai ne tsakanin siminti da ruwa. Wadannan halayen suna haifar da man siminti a hankali ya taurare don samar da ingantaccen tsari, a ƙarshe yana samar da samfuran ruwa kamar calcium silicate hydrate (CSH) da calcium hydroxide (CH). A lokacin wannan tsari, ƙimar amsawar hydration na siminti, yawan ruwa da riƙewar ruwa na slurry, da samar da samfuran hydration kai tsaye suna shafar ƙarfi da dorewar siminti na ƙarshe.
2. Tsarin aiki na ethers cellulose
Cellulose ether yana taka muhimmiyar rawa wajen daidaita tsarin jiki da sinadarai a cikin tsarin samar da ruwan siminti. Cellulose ether yafi rinjayar tsarin hydration na siminti ta hanyoyi biyu: daya shine ta hanyar tasiri da rarrabawa da zubar da ruwa a cikin siminti; ɗayan kuma shine ta hanyar yin tasiri ga tarwatsawa da kuma coagulation na siminti.
Kula da danshi da riƙe ruwa
Ethers na cellulose na iya inganta haɓakar ruwa na kayan tushen siminti. Saboda ƙarfin hydrophilicity, cellulose ether zai iya samar da ingantaccen maganin colloidal a cikin ruwa, wanda zai iya sha kuma yana riƙe da danshi. Wannan ƙarfin riƙe ruwa yana da mahimmanci wajen rage tsagewar da ke haifar da saurin asarar ruwa a cikin siminti lokacin farkon hydration. Musamman ma a cikin busassun yanayi ko yanayin ginin zafi mai zafi, ether cellulose na iya hana ruwa da sauri da sauri kuma ya tabbatar da cewa adadin ruwa a cikin slurry na siminti ya isa don tallafawa yanayin hydration na al'ada.
Rheology da kauri
Cellulose ethers kuma na iya inganta rheology na ciminti slurries. Bayan ƙara ether cellulose, daidaiton slurry ciminti zai karu sosai. An danganta wannan al'amari ga dogon tsarin sarkar da kwayoyin ether na cellulose suka samar a cikin ruwa. Wannan ma'auni mai tsayin sarkar na iya hana motsin siminti, ta yadda zai kara danko da daidaiton slurry. Wannan kadarar tana da mahimmanci musamman a aikace-aikace kamar filasta da tile adhesives, saboda yana hana turmi siminti gudu da sauri yayin samar da ingantaccen aikin gini.
Jinkirta ruwa kuma daidaita lokacin saiti
Cellulose ether na iya jinkirta amsawar hydration na siminti kuma yana ƙara saitin farko da lokacin saitin ƙarshe na slurry siminti. Wannan tasirin yana faruwa ne saboda ƙwayoyin cellulose ether suna adsorbed a saman simintin siminti, suna samar da shinge wanda ke hana hulɗar kai tsaye tsakanin ruwa da siminti, don haka rage jinkirin amsawar hydration. Ta hanyar jinkirta lokacin saita lokaci, ethers cellulose na iya inganta aikin gini, yana ba ma'aikatan ginin ƙarin lokaci don yin gyare-gyare da gyare-gyare.
3. Tasiri akan nau'in samfuran hydration na siminti
Kasancewar ethers cellulose kuma yana rinjayar microstructure na samfuran hydration na siminti. Nazarin ya nuna cewa ilimin halittar jiki na calcium silicate hydrate (CSH) gel zai canza bayan ƙara cellulose ether. Kwayoyin ether na cellulose na iya shafar tsarin crystal na CSH, yana sa ya zama sako-sako. Wannan sako-sako da tsarin zai iya rage ƙarfin farko zuwa wani ɗan lokaci, amma kuma yana taimakawa inganta taurin kayan.
Cellulose ethers kuma na iya rage samuwar ettringite a lokacin aikin hydration. Tun lokacin da ether cellulose ya rage yawan adadin hydration dauki, yawan samuwar ettringite a cikin siminti ya ragu, don haka rage yawan damuwa na ciki wanda ya haifar da haɓaka girma yayin aikin warkewa.
4. Tasiri akan haɓaka ƙarfi
Har ila yau, ethers na cellulose yana da tasiri mai mahimmanci akan ƙarfin haɓakar kayan da aka yi da siminti. Saboda ethers cellulose suna jinkirta yawan hydration na siminti, farkon ƙarfin haɓakar manna siminti yawanci yana raguwa. Duk da haka, yayin da hydration dauki ya ci gaba, da daidaita tasirin cellulose ether ruwa riƙewa da hydration samfurin halitta na iya fitowa a hankali, wanda zai taimaka wajen inganta ƙarfi a cikin mataki na gaba.
Ya kamata a lura cewa adadin da aka ƙara da nau'in ether cellulose yana da tasiri na dual akan ƙarfi. Adadin da ya dace na ether cellulose zai iya inganta aikin gine-gine kuma ya ƙara ƙarfin baya, amma amfani da yawa zai iya haifar da raguwa a farkon ƙarfin simintin kayan aiki kuma yana rinjayar kayan aikin injiniya na ƙarshe. Sabili da haka, a cikin aikace-aikace masu amfani, nau'in da sashi na ether cellulose yana buƙatar ingantawa da tsara su bisa ga ƙayyadaddun bukatun injiniya.
Cellulose ether yana rinjayar tsarin hydration da kayan abu na siminti ta hanyar inganta ruwa na kayan da aka yi da siminti, daidaita yawan adadin ruwa, da kuma rinjayar nau'in samfurori na hydration. Kodayake ethers cellulose na iya haifar da asarar ƙarfin farko, za su iya inganta karko da taurin kanka a cikin dogon lokaci. Bugu da ƙari na ether cellulose kuma zai iya inganta aikin gine-gine, musamman ma a cikin yanayin aikace-aikacen da ke buƙatar tsawon lokacin aiki da manyan buƙatun riƙe ruwa. Yana da irreplaceable abũbuwan amfãni. A cikin aikace-aikacen injiniya na ainihi, zaɓi mai ma'ana na nau'in da adadin ether cellulose na iya daidaita ƙarfin, aikin gini da buƙatun dorewa na kayan.
Lokacin aikawa: Satumba-27-2024