Cellulose ether wani nau'in fili ne na kwayoyin halitta polymer wanda ake amfani da shi sosai a cikin kayan gini, musamman a cikin kayan da aka gina da siminti. Cellulose ether na iya jinkirta tsarin hydration na ciminti, ta haka ne daidaita aikin aiki, saita lokaci da farkon ƙarfin ci gaban ciminti manna.
(1). Jinkirin amsawar ruwa
Cellulose ether na iya jinkirta amsawar hydration na siminti, wanda aka fi samu ta hanyar hanyoyin da ke biyowa:
1.1 Adsorption da garkuwa da tasirin
Babban maganin danko da aka kafa ta hanyar narkar da ether cellulose a cikin maganin ruwa na iya samar da fim din adsorption a saman sassan siminti. Samuwar wannan fim ya samo asali ne saboda haɓakar jiki na ƙungiyoyin hydroxyl a cikin ƙwayoyin ether na cellulose da ions a saman simintin siminti, wanda ke haifar da kariya daga simintin siminti, yana rage hulɗar tsakanin siminti da kwayoyin ruwa, ta haka ne. jinkirta amsawar hydration.
1.2 Samuwar Fim
A farkon matakan ciminti hydration, ether cellulose na iya samar da fim mai yawa a saman sassan siminti. Kasancewar wannan fim din yana hana yaduwar kwayoyin ruwa zuwa cikin sassan siminti, wanda hakan ya haifar da jinkirta jinkirin simintin. Bugu da kari, samuwar wannan fim na iya rage narkar da kuma yaduwa na calcium ions, da kara jinkirta samuwar hydration kayayyakin.
1.3 Rushewa da sakin ruwa
Cellulose ether yana da ƙarfi mai sha ruwa, yana iya sha danshi kuma ya sake shi a hankali. Wannan tsari na sakin ruwa na iya daidaita yawan ruwa da aiki na slurry siminti zuwa wani ɗan lokaci, kuma ya rage yawan adadin kuzari ta hanyar rage tasirin ruwa mai tasiri yayin aikin hydration.
(2). Tasirin abun da ke ciki na siminti
Cellulose ethers suna da tasiri daban-daban akan hydration na nau'ikan siminti daban-daban. Gabaɗaya, ether cellulose yana da ƙarin tasiri mai tasiri akan hydration na tricalcium silicate (C₃S). Kasancewar ether cellulose zai jinkirta jinkirin C₃S kuma ya rage yawan sakin zafin zafin jiki na C₃, don haka jinkirta haɓaka ƙarfin farko. Bugu da ƙari, ethers cellulose na iya rinjayar hydration na sauran ma'adanai irin su dicalcium silicate (C₂S) da tricalcium aluminate (C₃A), amma waɗannan tasirin suna da ƙananan ƙananan.
(3). Rheology da tasirin tsarin
Cellulose ether iya ƙara danko na ciminti slurry da kuma rinjayar da rheology. High danko slurry taimaka rage daidaitawa da kuma stratification na siminti barbashi, kyale siminti slurry ya kula da kyau uniformity kafin kafa. Wannan babban danko hali ba kawai jinkirta da hydration tsari na siminti, amma kuma inganta fluidity da yi na siminti slurry.
(4). Tasirin aikace-aikacen da matakan tsaro
Cellulose ethers suna da tasiri mai mahimmanci wajen jinkirta ciminti hydration kuma saboda haka ana amfani da su sau da yawa don daidaita lokacin saiti da ruwa na kayan tushen siminti. Duk da haka, sashi da nau'in ether cellulose yana buƙatar a sarrafa shi daidai, saboda yawan adadin ether na cellulose na iya haifar da matsaloli irin su rashin isasshen ƙarfin da wuri da ƙara raguwa na kayan da aka gina da siminti. Bugu da ƙari, daban-daban na ethers cellulose (irin su methylcellulose, hydroxypropylmethylcellulose, da dai sauransu) suna da hanyoyi daban-daban da kuma tasiri a cikin siminti slurries, kuma suna buƙatar zaɓar bisa ga takamaiman bukatun aikace-aikace.
Aikace-aikacen ether na cellulose a cikin kayan da aka yi da siminti ba zai iya jinkirta jinkirin aikin siminti kawai ba, amma har ma inganta aikin gine-gine da dorewa na kayan. Ta hanyar zaɓi mai ma'ana da amfani da ethers cellulose, ana iya inganta inganci da tasirin ginin siminti.
Lokacin aikawa: Agusta-03-2024