Desulfurization gypsum ne flue iskar gas samar da konewa na sulfur-dauke da man fetur (kwal, man fetur), masana'antu m sharar gida samar a lokacin desulfurization tsarkakewa tsari, da kuma hemihydrate gypsum (sunadarai dabara CaSO4 · 0.5H2O), da yi ne m ga cewa. na ginin gypsum na halitta. Sabili da haka, ana samun ƙarin bincike da aikace-aikace na yin amfani da gypsum mai lalacewa maimakon gypsum na halitta don samar da kayan daidaitawa. Abubuwan da aka haɗa da polymer na halitta kamar wakili na rage ruwa, wakili mai riƙe ruwa da retarder sune mahimman abubuwan aiki a cikin abun da ke tattare da kayan turmi mai daidaita kai. Haɗin kai da tsarin na biyu tare da kayan siminti al'amura ne da suka cancanci kulawa ɗaya. Saboda da halaye na samuwar tsari, fineness na desulfurized gypsum ne kananan (da barbashi size ne yafi rarraba tsakanin 40 da 60 μm), da kuma foda gradation ne m, don haka rheological Properties na desulfurized gypsum ne matalauta, da turmi. slurry shirya da shi sau da yawa sauki Warewa, stratification da zubar jini faruwa. Cellulose ether shine abin da aka fi amfani da shi a cikin turmi, kuma amfani da shi tare da wakili mai rage ruwa muhimmin garanti ne don gane cikakken aikin kayan haɓaka kai na tushen gypsum da aka lalata kamar aikin gini da kuma aikin injiniya na baya.
A cikin wannan takarda, ana amfani da ƙimar ruwa a matsayin ma'aunin sarrafawa (yawan digiri 145 mm ± 5 mm), yana mai da hankali kan tasirin abun ciki na ether cellulose da nauyin kwayoyin halitta (ƙimar danko) akan amfani da ruwa na tushen gypsum desulfurized. -matakin kayan aiki, asarar ruwa a cikin lokaci, da coagulation Dokokin tasiri na abubuwan asali kamar lokaci da kayan aikin injiniya na farko; a lokaci guda, gwada ka'idar tasiri na cellulose ether a kan zafi saki da zafi saki kudi na desulfurized gypsum hydration, nazarin tasirinsa a kan tsarin hydration na gypsum desulfurized, da farko tattauna irin wannan admixture Compatibility with desulfurization gypsum gelling system. .
1. Kayan albarkatun kasa da hanyoyin gwaji
1.1 Kayan danye
Gypsum foda: desulfurized gypsum foda wanda kamfani ya samar a Tangshan, babban abun da ke ciki na ma'adinai shine hemihydrate gypsum, ana nuna abun da ke tattare da sinadaransa a cikin Tebu 1, kuma ana nuna kaddarorinsa na zahiri a cikin Table 2.
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Admixtures sun hada da: cellulose ether (hydroxypropyl methylcellulose, HPMC a takaice); superplasticizer WR; defoamer B-1; EVA redispersible latex foda S-05, duk ana samunsu ta kasuwanci.
Tari: yashi kogin na halitta, yashi mai kyau wanda aka yi shi da kansa ta hanyar sieve 0.6 mm.
1.2 Hanyar gwaji
Kafaffen desulfurization gypsum: yashi: ruwa = 1: 0.5: 0.45, daidai adadin sauran admixtures, fluidity a matsayin iko index (fadada 145 mm ± 5 mm), ta hanyar daidaita ruwa amfani, bi da bi gauraye da siminti kayan (desulfurization gypsum + Cement). ) 0, 0.5‰, 1.0‰, 2.0‰, 3.0 ‰ cellulose ether (HPMC-20,000); kara gyara sashi na cellulose ether zuwa 1 ‰, zabi HPMC-20,000, HPMC-40,000 , HPMC-75,000, da HPMC-100,000 hydroxypropyl methylcellulose ethers tare da daban-daban kwayoyin nauyi (madaidaicin lambobi ne H2.50, H4, H1, H1, H2, H4, da H1. ), don nazarin sashi da kuma Nauyin kwayoyin (ƙimar danko) na ether cellulose Tasirin canje-canje akan kaddarorin gypsum-tushen turmi mai daidaita kai, da kuma tasirin su biyu akan ruwa, saita lokaci da farkon kayan inji na desulfurized gypsum kai matakin turmi. cakuda ana tattauna. Ana aiwatar da takamaiman hanyar gwajin daidai da buƙatun GB/T 17669.3-1999 "Ƙaddara Ƙaddamarwar Kayan Aikin Gina Gypsum".
Ana gudanar da gwajin zafi na hydration ta amfani da samfurin gypsum maras kyau da samfurori tare da abun ciki na cellulose ether na 0.5 ‰ da 3 ‰, kuma kayan aikin da aka yi amfani da shi shine nau'in nau'in TA-AIR zafi na hydration tester.
2. Sakamako da bincike
2.1 Tasirin abun ciki na ether cellulose akan ainihin kaddarorin turmi
Tare da karuwar abun ciki, aiki da haɗin kai na turmi suna da kyau sosai, asarar ruwa a kan lokaci yana raguwa sosai, kuma aikin gine-gine ya fi kyau, kuma turmi mai taurara ba shi da wani abu na delamination, da santsi na farfajiya. santsi da Aesthetics an inganta sosai. A lokaci guda, yawan ruwa na turmi don cimma ruwa iri ɗaya ya karu sosai. A 5 ‰, yawan amfani da ruwa ya karu da 102%, kuma an tsawaita lokacin saitin karshe ta 100 min, wanda shine sau 2.5 na samfurin mara kyau. Abubuwan kayan aikin injiniya na farko na turmi sun ragu sosai tare da haɓaka abun ciki na ether cellulose. Lokacin da abun ciki na ether cellulose ya kasance 5 ‰, ƙarfin 24 h mai sassauci da ƙarfin matsawa ya ragu zuwa 18.75% da 11.29% na samfurin mara kyau bi da bi. Ƙarfin matsawa shine 39.47% da 23.45% na samfurin mara kyau bi da bi. Ya kamata a lura da cewa tare da karuwar yawan adadin ruwa, yawan adadin turmi ya ragu sosai, daga 2069 kg / m3 a 0 zuwa 1747 kg / m3 a 5 ‰, raguwar 15.56%. Yawan turmi yana raguwa kuma porosity yana ƙaruwa, wanda shine daya daga cikin dalilan da ke haifar da raguwa a fili a cikin kayan aikin injiniya na turmi.
Cellulose ether ne wanda ba na ionic polymer. Ƙungiyoyin hydroxyl a kan sarkar ether cellulose da oxygen atom a kan ether bond na iya haɗuwa da kwayoyin ruwa don samar da haɗin gwiwar hydrogen, suna juya ruwan kyauta zuwa ruwa mai ɗaure, don haka suna taka rawa wajen riƙe ruwa. Macroscopically Ana bayyana shi azaman haɓaka haɗin kai na slurry [5]. Haɓakawa a cikin danko mai slurry ba kawai zai ƙara yawan amfani da ruwa ba, har ma da narkar da ether cellulose za a yi adsorbed a saman gypsum barbashi, hana hydration dauki da kuma tsawaita lokacin saitin; yayin aikin motsa jiki, za a kuma gabatar da adadi mai yawa na kumfa. Voids za su yi girma yayin da turmi ya taurare, a ƙarshe yana rage ƙarfin turmi. Cikakken la'akari da amfani da ruwa na unilateral na turmi cakuda, yi yi, saitin lokaci da inji Properties, da kuma daga baya karko, da dai sauransu, abun ciki na cellulose ether a desulfurized gypsum tushen kai matakin turmi kada ya wuce 1‰.
2.2 Tasirin nauyin kwayoyin halitta na cellulose ether akan aikin turmi
Yawancin lokaci, mafi girman danko da mafi kyawun fineness na ether cellulose, mafi kyawun riƙewar ruwa da ƙara ƙarfin haɗin gwiwa. aikin zai zama mummunan tasiri. Sabili da haka, an ƙara gwada tasirin ethers na cellulose na ma'auni daban-daban akan ainihin kaddarorin kayan turmi na tushen gypsum. Bukatar ruwa na turmi ya karu zuwa wani matsayi, amma ba shi da wani tasiri a fili akan saitin lokaci da ruwa. A lokaci guda kuma, ƙarfin sassauƙa da matsawa na turmi a cikin jihohi daban-daban sun nuna yanayin ƙasa, amma raguwar ta kasance ƙasa da tasirin abun ciki na ether na cellulose akan kayan inji. A takaice, karuwa a cikin kwararar kwayar cutar kwayar cutar kwayar cutar sel ba shi da tasiri a kan ayyukan harafin na harma. Idan akai la'akari da dacewa da ginin, ƙananan danko da ƙananan ƙwayoyin cellulose ether ya kamata a zaba a matsayin kayan da aka lalata gypsum na tushen kai.
2.3 Tasirin ether cellulose akan zafin hydration na gypsum desulfurized
Tare da karuwa da abun ciki na ether cellulose, exothermic kololuwar hydration na gypsum desulfurized sannu a hankali ya ragu, kuma lokacin matsayi mafi girma ya ɗan jinkirta, yayin da zafi mai zafi na hydration ya ragu, amma ba a fili ba. Wannan yana nuna cewa ether cellulose na iya jinkirta ƙimar hydration da hydration digiri na gypsum desulfurized zuwa wani matsayi, don haka sashi bai kamata ya zama babba ba, kuma ya kamata a sarrafa shi a cikin 1 ‰. Ana iya ganin cewa fim din colloidal da aka kafa bayan cellulose ether ya sadu da ruwa yana adsorbed a saman sassan gypsum da aka lalata, wanda ya rage yawan hydration na gypsum kafin 2 h. A lokaci guda, riƙewar ruwa na musamman da tasirinsa mai kauri yana jinkirta fitar da ruwa na slurry da Rushewa yana da amfani ga ƙarin hydration na gypsum desulfurized a mataki na gaba. Don taƙaitawa, lokacin da ake sarrafa adadin da ya dace, ether cellulose yana da iyakanceccen tasiri akan ƙimar hydration da digiri na gypsum desulfurized kanta. A lokaci guda, haɓaka abun ciki na ether cellulose da nauyin kwayoyin halitta zai kara yawan danko na slurry kuma yana nuna kyakkyawan aikin riƙe ruwa. Domin tabbatar da ruwa na gypsum da aka lalatar da turmi mai sarrafa kansa, yawan ruwa zai karu sosai, wanda shine saboda tsawaita lokacin saitin turmi. Babban dalili na raguwa a cikin kayan aikin injiniya.
3. Kammalawa
(1) Lokacin da ake amfani da ruwa a matsayin ma'aunin sarrafawa, tare da haɓakar abun ciki na ether cellulose, lokacin saita lokaci na desulfurized gypsum-based self-leveling turmi yana da tsayi sosai, kuma kayan aikin injiniya suna raguwa sosai; idan aka kwatanta da abun ciki, nauyin kwayoyin halitta na cellulose ether Ƙarar yana da ɗan tasiri akan abubuwan da ke sama na turmi. Yin la'akari da mahimmanci, ya kamata a zaɓi ether cellulose tare da ƙananan nauyin kwayoyin halitta (ƙimar danko ƙasa da 20 000 Pa·s), kuma ya kamata a sarrafa sashi a cikin 1 ‰ na siminti.
(2) Sakamakon gwaji na hydration zafi na gypsum desulfurized ya nuna cewa a cikin iyakar wannan gwajin, ether cellulose yana da iyakacin tasiri akan tsarin hydration da tsarin hydration na gypsum desulfurized. Ƙara yawan amfani da ruwa da raguwar yawan yawa sune manyan dalilan da ke haifar da raguwa a cikin kayan aikin injiniya na tushen turmi na gypsum.
Lokacin aikawa: Mayu-08-2023