Abubuwan Manna Siminti wanda Cellulose Ether ya gyaru

Ta hanyar auna kayan aikin injiniya, ƙimar riƙe ruwa, saita lokaci da zafi na hydration na cellulose ether tare da viscosities daban-daban a cikin nau'i-nau'i daban-daban na simintin siminti, da kuma amfani da SEM don nazarin samfurori na hydration, tasirin cellulose ether akan aikin ciminti ya kasance. yayi karatu. dokar tasiri. Sakamakon ya nuna cewa ƙari na cellulose ether zai iya jinkirta ciminti hydration, jinkirta ciminti hardening da saitin, rage hydration zafi saki, tsawanta lokacin bayyanar hydration zafin jiki ganiya, da retarding sakamako yana ƙaruwa tare da karuwa na sashi da danko. Cellulose ether na iya ƙara yawan adadin ruwa na turmi, kuma zai iya inganta yawan ruwa na turmi tare da tsarin launi na bakin ciki, amma lokacin da abun ciki ya wuce 0.6%, karuwar tasirin ruwa ba shi da mahimmanci; abun ciki da danko su ne abubuwan da ke ƙayyade slurry siminti da aka gyara cellulose. A cikin aikace-aikacen cellulose ether modified turmi, sashi da danko ya kamata a yi la'akari da yawa.

Mabuɗin kalmomi:ether cellulose; sashi; jinkiri; rike ruwa

Turmi gini na ɗaya daga cikin kayan gini da ake buƙata don ayyukan gini. A cikin 'yan shekarun nan, tare da babban aikace-aikace na kayan aikin bangon bango da kuma inganta matakan kariya da buƙatun buƙatun don ganuwar waje, an gabatar da buƙatu mafi girma don tsayin daka, aikin haɗin gwiwa da aikin ginin turmi. Saboda gazawar babban bushewar bushewa, rashin ƙarfi mara ƙarfi, da ƙarancin ƙarfin haɗin gwiwa, turmi na gargajiya sau da yawa ba zai iya biyan buƙatun gini ba, ko haifar da matsaloli kamar faɗuwar kayan ado. Kamar yadda ake yi da turmi, saboda turmi na rasa ruwa da sauri, sai a gajarta wurin wuri da taurin lokaci, kuma matsaloli irin su tsagewa da ramuka suna faruwa a lokacin manyan gine-gine, waɗanda ke yin tasiri sosai ga ingancin aikin. Turmi na gargajiya yana asarar ruwa da sauri kuma ruwan siminti bai isa ba, wanda ke haifar da ɗan gajeren lokacin buɗe turmin simintin, wanda shine mabuɗin yin tasiri ga aikin turmi.

Cellulose ether yana da sakamako mai kauri mai kyau da riƙe ruwa, kuma an yi amfani da shi sosai a fagen turmi, kuma ya zama abin haɗaɗɗen da ba makawa don inganta riƙewar turmi da samar da aikin gini, yadda ya kamata ya rage ginin da kuma amfani da turmi na gargajiya yadda ya kamata. . Matsalar asarar ruwa a cikin matsakaici. Cellulose da ake amfani da shi a turmi yawanci ya haɗa da methyl cellulose ether (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose ether (HEMC), hydroxyethyl cellulose ether (HEC), da dai sauransu. Daga cikinsu, HPMC da HEMC sune mafi yawan amfani.

Wannan takarda yafi nazarin tasirin ether cellulose akan aiki (yawan riƙe ruwa, asarar ruwa da lokacin saita lokaci), kayan aikin injiniya (ƙarfin matsawa da ƙarfin haɗin gwiwa), dokar hydration da microstructure na manna siminti. Yana ba da tallafi ga kaddarorin simintin siminti na ether da aka gyara kuma yana ba da tunani don aikace-aikacen ether ɗin da aka gyara na cellulose ether.

1. Gwaji

1.1 Kayan danye

Siminti: simintin Portland na yau da kullun (PO 42.5) Simintin da Kamfanin Siminti na Wuhan Yadong ya kera, wanda ke da wani yanki na musamman na 3500 cm.²/g.

Cellulose ether: samuwan kasuwanci hydroxypropyl methylcellulose ether (MC-5, MC-10, MC-20, viscosities na 50,000 Pa·S, 100000 Pa·S, 200000 Pa·S, bi da bi).

1.2 Hanya

Kayan aikin injiniya: A cikin aiwatar da shirye-shiryen samfurin, adadin cellulose ether shine 0.0% ~ 1.0% na yawan siminti, kuma rabon ciminti na ruwa shine 0.4. Kafin ƙara ruwa da motsawa, haɗa ether cellulose da siminti daidai. An yi amfani da man siminti tare da girman samfurin 40 x 40 x 40 don gwaji.

Lokacin saitawa: Ana aiwatar da hanyar ma'auni bisa ga GB/T 1346-2001 "Cikin Ƙimar Ruwa na Ciminti, Lokacin Saiti, Hanyar Gwajin Ƙarfafa".

Riƙewar ruwa: Gwajin riƙewar ruwa na man siminti yana nufin daidaitaccen DIN 18555 "Hanyar gwaji don turmi kayan siminti na inorganic".

Zafin hydration: Gwajin ya ɗauki TAM Air microcalorimeter na Kamfanin Kayan Kayan Aikin TA na Amurka, kuma rabon siminti na ruwa shine 0.5.

Samfurin hydration: Haɗa ruwa da ether cellulose a ko'ina, sannan shirya slurry siminti, fara lokaci, ɗaukar samfura a wurare daban-daban, dakatar da hydration tare da cikakken ethanol don gwaji, kuma rabon siminti na ruwa shine 0.5.

2. Sakamako da tattaunawa

2.1 Mechanical Properties

Daga tasirin abun ciki na ether cellulose akan ƙarfi, ana iya ganin cewa tare da haɓakar MC-10 cellulose ether abun ciki, ƙarfin 3d, 7d da 28d duk sun ragu; cellulose ether yana rage ƙarfin 28d mafi mahimmanci. Daga tasirin cellulose ether danko akan ƙarfi, ana iya ganin cewa ko cellulose ether ne tare da danko na 50,000 ko 100,000 ko 200,000, ƙarfin 3d, 7d, da 28d zai ragu. Hakanan za'a iya ganin cewa cellulose ether Viscosity ba shi da wani tasiri mai mahimmanci akan ƙarfi.

2.2 Lokacin saita lokaci

Daga tasirin abun ciki na 100,000 viscosity cellulose ether akan lokacin saiti, ana iya ganin cewa tare da karuwar abun ciki na MC-10, duka lokacin saiti na farko da lokacin saitin karshe ya karu. Lokacin da abun ciki ya kasance 1%, lokacin saitin farko Ya kai 510min, kuma lokacin saitin ƙarshe ya kai 850min. Idan aka kwatanta da maraice, an tsawaita lokacin saitin farko da 210min, kuma an tsawaita lokacin saitin ƙarshe da 470min.

Daga tasirin cellulose ether danko akan saita lokaci, ana iya ganin cewa ko MC-5, MC-10 ko MC-20, zai iya jinkirta saitin siminti, amma idan aka kwatanta da ethers cellulose uku, saitin farko. lokaci da saitin karshe Lokacin yana tsawaita tare da karuwar danko. Wannan shi ne saboda cellulose ether za a iya ƙara a saman simintin barbashi, ta haka ne ya hana ruwa tuntubar da siminti barbashi, ta yadda za a jinkirta ciminti hydration. Mafi girman danko na ether cellulose, da kauri Layer adsorption a saman simintin barbashi, kuma mafi muhimmanci da retarding sakamako.

2.3 Yawan riƙe ruwa

Daga ka'idar tasiri na cellulose ether abun ciki akan adadin ruwa, ana iya ganin cewa tare da karuwar abun ciki, yawan adadin ruwa na turmi yana ƙaruwa, kuma lokacin da abun ciki na ether cellulose ya fi 0.6%, yawan adadin ruwa yana karuwa. barga a yankin. Duk da haka, idan aka kwatanta da uku cellulose ethers, akwai bambance-bambance a cikin tasirin danko a kan yawan riƙe ruwa. A ƙarƙashin wannan sashi, alaƙar da ke tsakanin ƙimar riƙe ruwa shine: MC-5≤MC-10≤MC-20.

2.4 Zafin ruwa

Daga tasirin nau'in ether na cellulose da abun ciki akan zafi na hydration, ana iya ganin cewa tare da karuwar abun ciki na MC-10, zafi mai zafi na hydration yana raguwa a hankali, kuma lokacin zafi mai zafi yana canzawa daga baya; Hakanan zafi na hydration yana da tasiri mai yawa. Tare da karuwar danko, zafi na hydration ya ragu sosai, kuma kololuwar zafin jiki ya canza sosai daga baya. Ya nuna cewa ether cellulose na iya jinkirta ciminti hydration, da kuma retarding sakamakon yana da alaka da abun ciki da danko na cellulose ether, wanda ya dace da sakamakon bincike na saita lokaci.

2.5 Binciken samfuran hydration

Daga nazarin SEM na samfurin hydration na 1d, ana iya ganin cewa lokacin da aka ƙara 0.2% MC-10 cellulose ether, ana iya ganin babban adadin clinker da ettringite mara kyau tare da mafi kyawun crystallization. %, lu'ulu'u na ettringite suna raguwa sosai, wanda ke nuna cewa ether cellulose na iya jinkirta hydration na siminti da kuma samar da samfuran hydration a lokaci guda. Ta hanyar kwatanta nau'ikan ethers na cellulose guda uku, ana iya gano cewa MC-5 na iya yin crystallization na ettringite a cikin samfuran hydration na yau da kullun, kuma crystallization na ettringite ya fi na yau da kullun. alaka da kauri daga cikin Layer.

3. Kammalawa

a. Bugu da ƙari na cellulose ether zai jinkirta hydration na siminti, jinkirta taurin da saitin siminti, rage zafi saki na hydration, da kuma tsawanta lokacin bayyanar hydration zafin jiki kololuwa. Tare da karuwa na sashi da danko, tasirin retarding zai karu.

b. Cellulose ether na iya ƙara yawan riƙewar ruwa na turmi, kuma zai iya inganta riƙon ruwa na turmi tare da tsarin siriri-Layer. Riƙewar ruwan sa yana da alaƙa da sashi da danko. Lokacin da adadin ya wuce 0.6%, tasirin riƙewar ruwa baya ƙaruwa sosai.