1. Zafin ruwa
Dangane da yanayin sakin zafin ruwa a kan lokaci, tsarin ruwa na siminti yawanci ana raba shi zuwa matakai biyar, wato, lokacin ruwa na farko (0~15min), lokacin shigarwa (15min~4h), lokacin hanzartawa da saitawa (4h~8h), lokacin rage gudu da taurarewa (8h~24h), da lokacin warkarwa (1d~28d).
Sakamakon gwajin ya nuna cewa a farkon matakin shigar da ruwa (watau, lokacin farko na ruwa), lokacin da adadin HEMC ya kai kashi 0.1% idan aka kwatanta da siminti mara komai, kololuwar waje ta slurry ta ci gaba kuma kololuwar ta ƙaru sosai. Lokacin da adadinHEMCyana ƙaruwa zuwa Lokacin da ya wuce 0.3%, kololuwar exothermic ta farko ta slurry tana jinkiri, kuma ƙimar kololuwar tana raguwa a hankali tare da ƙaruwar abun ciki na HEMC; HEMC a bayyane yake zai jinkirta lokacin shigarwa da lokacin haɓaka slurry na siminti, kuma mafi girman abun ciki, tsawon lokacin shigarwa, lokacin haɓakawa yana ƙaruwa, kuma ƙarami kololuwar exothermic; canjin abun ciki na cellulose ether ba shi da wani tasiri a bayyane akan tsawon lokacin ragewa da lokacin kwanciyar hankali na slurry na siminti, kamar yadda aka nuna a Hoto na 3(a) An nuna cewa cellulose ether kuma zai iya rage zafin hydration na manna siminti cikin awanni 72, amma lokacin da zafin hydration ya fi awanni 36, canjin abun ciki na cellulose ether ba shi da tasiri sosai akan zafin hydration na manna siminti, kamar Hoto na 3(b).
Hoto na 3: Sauyin yanayin fitar da zafi daga manna siminti tare da abubuwan da ke cikin cellulose ether (HEMC)
2. Mkaddarorin fasaha:
Ta hanyar nazarin nau'ikan ethers cellulose guda biyu tare da viscosities na 60000Pa·s da 100000Pa·s, an gano cewa ƙarfin matsi na turmi da aka gyara wanda aka haɗa da methyl cellulose ether ya ragu a hankali tare da ƙaruwar abun ciki. Ƙarfin matsi na turmi da aka gyara wanda aka haɗa da viscosity na 100000Pa·s hydroxypropyl methyl cellulose ether yana ƙaruwa da farko sannan ya ragu tare da ƙaruwar abun ciki (kamar yadda aka nuna a Hoto na 4). Ya nuna cewa haɗa methyl cellulose ether zai rage ƙarfin matsi na turmi siminti sosai. Yawan adadin, ƙaramin ƙarfin zai kasance; ƙaramin danko, mafi girman tasirin akan asarar ƙarfin matsi na turmi; hydroxypropyl methyl cellulose ether Lokacin da adadin ya ƙasa da 0.1%, ana iya ƙara ƙarfin matsi na turmi yadda ya kamata. Lokacin da adadin ya fi 0.1%, ƙarfin matsi na turmi zai ragu tare da ƙaruwar sashi, don haka ya kamata a sarrafa sashi a 0.1%.
Hoto na 4 Ƙarfin matsi na turmi siminti na MC1, MC2 da MC3 da aka gyara na 3d, 7d da 28d
(Methyl cellulose ether, viscosity 60000Pa·S, wanda daga baya ake kira MC1; methyl cellulose ether, viscosity 100000Pa·S, wanda ake kira MC2; hydroxypropyl methylcellulose ether, viscosity 100000Pa·S, wanda ake kira MC3).
3. Clokacin yin kuri'a:
Ta hanyar auna lokacin saita hydroxypropyl methylcellulose ether tare da danko na 100000Pa·s a cikin nau'ikan manna siminti daban-daban, an gano cewa tare da ƙaruwar yawan HPMC, lokacin saitawa na farko da lokacin saitawa na ƙarshe na turmi siminti sun tsawaita. Lokacin da yawan ya kai 1%, lokacin saitawa na farko ya kai mintuna 510, kuma lokacin saitawa na ƙarshe ya kai mintuna 850. Idan aka kwatanta da samfurin da babu komai, lokacin saitawa na farko yana ƙaruwa da mintuna 210, kuma lokacin saitawa na ƙarshe yana ƙaruwa da mintuna 470 (kamar yadda aka nuna a Hoto na 5). Ko HPMC ne mai danko na 50000Pa s, 100000Pa s ko 200000Pa s, yana iya jinkirta saitin siminti, amma idan aka kwatanta da ethers cellulose guda uku, lokacin saitawa na farko da lokacin saitawa na ƙarshe suna tsawaita tare da ƙaruwar danko, kamar yadda aka nuna a Hoto na 6 da aka nuna. Wannan ya faru ne saboda cellulose ether yana shawagi a saman barbashin siminti, wanda hakan ke hana ruwa shiga barbashin siminti, wanda hakan ke jinkirta danshi daga siminti. Yayin da yawan danko na cellulose ether ke ƙaruwa, haka nan kauri na shaye-shayen siminti ke ƙaruwa, kuma tasirin rage tasirin yana ƙaruwa.
Hoto na 5 Tasirin abubuwan da ke cikin cellulose ether akan saita lokacin turmi
Hoto na 6 Tasirin danko daban-daban na HPMC akan lokacin saita manna siminti
(MC-5(50000Pa·s), MC-10(100000Pa·s) da MC-20(200000Pa·s))
Methyl cellulose ether da hydroxypropyl methyl cellulose ether za su tsawaita lokacin saita siminti, wanda zai iya tabbatar da cewa simintin yana da isasshen lokaci da ruwa don amsawar ruwa, da kuma magance matsalar ƙarancin ƙarfi da matakin ƙarshe na simintin bayan taurare. Matsalar tsagewa.
4. Rike ruwa:
An yi nazarin tasirin sinadarin cellulose ether akan riƙe ruwa. An gano cewa tare da ƙaruwar abun ciki na cellulose ether, yawan riƙe ruwa na turmi yana ƙaruwa, kuma lokacin da abun ciki na cellulose ether ya fi 0.6%, yawan riƙe ruwa yana da ƙarfi. Duk da haka, idan aka kwatanta nau'ikan cellulose ethers guda uku (HPMC tare da ɗanko na 50000Pa s (MC-5), 100000Pa s (MC-10) da 200000Pa s (MC-20)), tasirin ɗanko akan riƙe ruwa ya bambanta. Alaƙar da ke tsakanin ƙimar riƙe ruwa shine: MC-5.
Lokacin Saƙo: Afrilu-28-2024