Cellulose ether a kan slag yashi turmi

Yin amfani da P·II 52.5 siminti a matsayin siminti abu da karfe slag yashi a matsayin lafiya tara, da karfe slag yashi tare da high fluidity da kuma high ƙarfi an shirya ta ƙara sinadaran Additives kamar ruwa rage ruwa, latex foda da defoamer Special turmi, da kuma sakamakon biyu daban-daban. viscosities (2000mPa·s da 6000mPa·s) na hydroxypropyl methylcellulose ether (HPMC) akan riƙewar ruwa, ruwa da ƙarfi an yi nazari. Sakamakon ya nuna cewa: (1) Dukansu HPMC2000 da HPMC6000 na iya haɓaka ƙimar riƙon ruwa na sabon turmi mai gauraya da haɓaka aikin riƙon ruwa; (2) Lokacin da abun ciki na ether cellulose ya yi ƙasa, tasirin tasirin turmi ba a bayyane yake ba. Lokacin da aka ƙara zuwa 0.25% ko sama da haka, yana da wani sakamako mai lalacewa akan ruwa na turmi, daga cikin abin da lalacewar HPMC6000 ya fi dacewa; (3) Bugu da ƙari na cellulose ether ba shi da wani tasiri mai tasiri akan ƙarfin 28-day compressive na turmi, amma ƙari na HPMC2000 Rashin lokaci mara kyau, a fili ba shi da kyau ga ƙarfin flexural na shekaru daban-daban, kuma a lokaci guda yana rage mahimmanci. farkon (kwanaki 3 da kwanaki 7) ƙarfin turmi; (4) Bugu da kari na HPMC6000 yana da wani tasiri a kan flexural ƙarfi na shekaru daban-daban , amma rage ya kasance da muhimmanci ƙasa da na HPMC2000. A cikin wannan takarda, an yi la'akari da cewa HPMC6000 ya kamata a zaba lokacin shirya karfe slag yashi na musamman turmi tare da babban ruwa, yawan riƙe ruwa da ƙarfin ƙarfi, kuma adadin bai kamata ya zama mafi girma fiye da 0.20%.

Mabuɗin kalmomi:karfe slag yashi; ether cellulose; danko; aikin aiki; ƙarfi

gabatarwa

Karfe slag ne ta-samfurin samar da karfe. Tare da bunƙasa masana'antar ƙarfe da karafa, fitar da karafa a duk shekara ya karu da kusan tan miliyan 100 a cikin 'yan shekarun nan, kuma matsalar tarawa sakamakon gazawar yin amfani da albarkatun ƙasa a kan lokaci yana da tsanani sosai. Don haka, yin amfani da albarkatu da zubar da shingen ƙarfe ta hanyar kimiyya da ingantattun hanyoyin matsala ce da ba za a yi watsi da ita ba. Karfe slag yana da halaye na babban yawa, m rubutu da kuma high matsawa ƙarfi, kuma za a iya amfani da a maimakon na halitta yashi a siminti turmi ko kankare. Karfe slag kuma yana da wani reactivity. Karfe slag ana nika a cikin wani fineness foda (karfe slag foda). Bayan an haɗe shi cikin kankare, zai iya haifar da tasirin pozzolanic, wanda ke taimakawa haɓaka ƙarfin slurry da haɓaka canjin mu'amala tsakanin jimlar siminti da slurry. yanki, don haka ƙara ƙarfin simintin. Duk da haka, dole ne a kula da cewa slag karfe da aka saki ba tare da wani ma'auni ba, na ciki free calcium oxide, free magnesium oxide da RO lokaci zai haifar da rashin ƙarfi girma kwanciyar hankali na karfe slag, wanda ya fi mayar da iyaka da yin amfani da karfe slag a matsayin m da kuma m. m aggregates. Aikace-aikace a cikin turmi siminti ko kankare. Wang Yuji et al. Takaita hanyoyin kula da fatalwar karfe daban-daban kuma ta gano cewa tudun karfen da aka yi amfani da shi ta hanyar shayarwa mai zafi yana da kwanciyar hankali mai kyau kuma yana iya kawar da matsalar fadada shi a cikin siminti, kuma a zahiri an aiwatar da aikin jiyya mai zafi a Shanghai No. 3 Iron da Karfe Shuka don karo na farko. Bugu da ƙari ga matsalar kwanciyar hankali, ƙararrakin slag ɗin ƙarfe kuma suna da halaye na ƙazantattun pores, kusurwoyi da yawa, da ƙananan samfuran hydration a saman. Lokacin da aka yi amfani da su azaman tarawa don shirya turmi da kankare, aikinsu yana shafar sau da yawa. A halin yanzu, a ƙarƙashin yanayin tabbatar da daidaiton girma, yin amfani da slag na ƙarfe azaman tarawa mai kyau don shirya turmi na musamman shine muhimmin jagora don amfani da albarkatu na ƙarfe slag. Nazarin ya gano cewa ƙara mai rage ruwa, latex foda, cellulose ether, iska-entraining wakili da defoamer zuwa karfe slag yashi turmi iya inganta cakuda yi da kuma taurare yi na karfe slag yashi turmi kamar yadda ake bukata. Marubucin ya yi amfani da ma'auni na ƙara latex foda da sauran abubuwan da aka haɗa don shirya yashi mai ƙarfi mai ƙarfi na gyara turmi. A cikin samarwa da aikace-aikacen turmi, ether cellulose shine mafi yawan haɗakar sinadarai. Mafi yawan amfani da ethers cellulose a cikin turmi sune hydroxypropyl methyl cellulose ether (HPMC) da hydroxyethyl methyl cellulose ether (HEMC). ) Dakata. Cellulose ether na iya inganta aikin turmi mai yawa, kamar ba da turmi kyakkyawan tanadin ruwa ta hanyar kauri, amma ƙara ether cellulose kuma zai shafi ruwa, abun cikin iska, saita lokaci da taurin turmi. Daban-daban kaddarorin.

Domin ingantacciyar jagorar haɓakawa da aikace-aikacen turmi mai yashi na ƙarfe, bisa aikin binciken da aka yi a baya akan turmi mai yashi na ƙarfe, wannan takarda tana amfani da nau'ikan viscosities iri biyu (2000mPa).·s da 6000mPa·s) na hydroxypropyl methyl cellulose ether (HPMC) Gudanar da bincike na gwaji game da tasirin karfe slag yashi mai ƙarfi turmi mai ƙarfi akan aikin aiki (ruwa da riƙe ruwa) da ƙarfi da ƙarfi.

1. Bangaren gwaji

1.1 Kayan danye

Siminti: Onoda P·II 52.5 siminti.

Karfe slag yashi: The Converter karfe slag samar da Shanghai Baosteel ana sarrafa ta zafi shaƙewa tsari, tare da girma yawa na 1910kg/m³, na matsakaicin yashi, da kuma ƙarancin ƙarancin 2.3.

Mai rage ruwa: polycarboxylate water reducer (PC) wanda Shanghai Gaotie Chemical Co., Ltd., ya samar a cikin foda.

Latex foda: Model 5010N wanda Wacker Chemicals (China) Co., Ltd ke bayarwa.

Defoamer: Code P803 samfurin samar da Jamus Mingling Chemical Group, foda, yawa 340kg/m³, sikelin launin toka 34% (800°C), ƙimar pH 7.2 (20°C DIN ISO 976, 1% IN DIST, ruwa).

Cellulose ether: hydroxypropyl methylcellulose ether samar daKima Chemical Co., Ltd., wanda ke da danko na 2000mPa·s an tsara shi azaman HPMC2000, kuma wanda ke da danko na 6000mPa·s an tsara shi azaman HPMC6000.

Hada ruwa: ruwan famfo.

1.2 Rabon gwaji

Matsakaicin ciminti-yashi na turmi mai yashi na karfe da aka shirya a farkon matakin gwajin shine 1: 3 (rabo mai yawa), rabon siminti na ruwa shine 0.50 (rabo mai yawa), kuma adadin polycarboxylate superplasticizer shine 0.25% (Kashi na ciminti, iri ɗaya a ƙasa.), Abun ciki na latex foda shine 2.0%, kuma abun ciki na defoamer shine 0.08%. Don kwatankwacin gwaje-gwaje, adadin ethers cellulose guda biyu HPMC2000 da HPMC6000 sun kasance 0.15%, 0.20%, 0.25% da 0.30%, bi da bi.

1.3 Hanyar gwaji

Hanyar Gwajin Ruwan Turmi: shirya turmi bisa ga GB/T 17671-1999 "Gwajin Ƙarfin Ƙarfin Siminti (Tsarin ISO)", yi amfani da ƙirar gwajin a cikin GB/T2419-2005 "Tsarin Gwajin Ruwan Ciminti", da motsawa Zuba turmi mai kyau. a cikin injin gwajin da sauri, sannan a goge turmin da ya wuce gona da iri tare da juzu'i, ɗaga samfurin gwajin sama a tsaye, kuma lokacin da turmi ya daina gudana, auna matsakaicin diamita na wurin yada turmi da diamita a tsaye, kuma ɗauki matsakaicin ƙimar, sakamakon daidai yake zuwa 5mm.

Ana gudanar da gwajin adadin ruwa na turmi bisa ga hanyar da aka ƙayyade a cikin JGJ/T 70-2009 "Hanyoyin Gwaji don Kayayyakin Gine-gine na Gine-gine".

Ana yin gwajin ƙarfin matsawa da ƙarfin sassauƙa na turmi bisa ga hanyar da aka kayyade a GB/T 17671-1999, kuma shekarun gwajin sune kwanaki 3, kwanaki 7 da kwanaki 28 bi da bi.

2. Sakamako da tattaunawa

2.1 Tasirin ether cellulose akan aikin aiki na turmi yashi na karfe slag

Daga sakamakon daban-daban abun ciki na cellulose ether a kan ruwa riƙewar karfe slag yashi turmi, za a iya gani cewa ƙara HPMC2000 ko HPMC6000 iya muhimmanci inganta ruwa riƙewar freshly gauraye turmi. Tare da karuwar abun ciki na ether cellulose, yawan ajiyar ruwa na turmi ya karu sosai sannan ya kasance barga. Daga cikin su, lokacin da abun ciki na ether cellulose ya kasance kawai 0.15%, yawan adadin ruwa na turmi ya karu da kusan 10% idan aka kwatanta da wannan ba tare da ƙari ba, ya kai 96%; lokacin da abun ciki ya karu zuwa 0.30%, yawan ajiyar ruwa na turmi ya kai 98.5%. Ana iya ganin cewa ƙari na ether cellulose zai iya inganta haɓakar ruwa na turmi.

Daga tasirin nau'ikan nau'ikan ether na cellulose daban-daban akan ruwa na turmi mai yashi na karfe slag, ana iya ganin cewa lokacin da adadin ether cellulose ya kasance 0.15% da 0.20%, ba shi da wani tasiri mai tasiri akan ruwa na turmi; lokacin da adadin ya karu zuwa 0.25% ko sama da haka , yana da tasiri mafi girma akan ruwa, amma har yanzu ana iya kiyaye ruwa a 260mm da sama; lokacin da ethers guda biyu na cellulose suke cikin adadin guda ɗaya, idan aka kwatanta da HPMC2000, mummunan tasirin HPMC6000 akan yawan ruwa na turmi ya fi bayyane.

Hydroxypropyl methyl cellulose ether shine polymer wanda ba na ionic ba tare da kyakkyawar riƙewar ruwa, kuma a cikin wani yanki na musamman, mafi girman danko, mafi kyawun riƙewar ruwa kuma mafi mahimmancin tasiri mai zurfi. Dalili kuwa shi ne cewa rukunin hydroxyl akan sarkarsa ta kwayoyin halitta da oxygen atom akan ether bond na iya samar da hadijin hydrogen tare da kwayoyin ruwa, yin ruwa kyauta zuwa ruwa mai daure. Saboda haka, a daidai wannan sashi, HPMC6000 na iya ƙara danko na turmi fiye da HPMC2000, rage yawan ruwa na turmi, kuma ƙara yawan adadin ruwa a fili. Daftarin aiki 10 yayi bayanin abin da ke sama ta hanyar samar da maganin viscoelastic bayan an narkar da ether cellulose a cikin ruwa, kuma yana nuna halayen kwarara ta hanyar lalacewa. Za a iya cewa turmi na karfen da aka shirya a cikin wannan takarda yana da ruwa mai yawa, wanda zai iya kaiwa 295mm ba tare da haɗuwa ba, kuma nakasar ta tana da girma. Lokacin da aka ƙara ether cellulose, slurry zai sha ruwa mai zurfi, kuma ikonsa na mayar da siffar ƙananan ƙananan ne, don haka ya haifar da raguwa a cikin motsi.

2.2 Tasirin ether cellulose akan ƙarfin karfe slag turmi yashi

Bugu da kari na cellulose ether ba kawai rinjayar da aikin yi na karfe slag yashi turmi, amma kuma rinjayar da inji Properties.

Daga sakamakon daban-daban dosages na cellulose ether a kan matsa lamba ƙarfi na karfe slag yashi turmi, za a iya gani cewa bayan ƙara HPMC2000 da HPMC6000, da compressive ƙarfi na turmi a kowane sashi yana ƙaruwa da shekaru. Ƙara HPMC2000 ba shi da wani tasiri mai mahimmanci akan ƙarfin ƙwanƙwasa na kwanaki 28 na turmi, kuma ƙarfin ƙarfin ba shi da girma; yayin da HPMC2000 yana da tasiri mafi girma a farkon (3-rana da 7-day) ƙarfi, yana nuna yanayin raguwa a bayyane, kodayake adadin ya karu zuwa 0.25% kuma Sama, ƙarfin matsawa na farko ya ƙaru kaɗan, amma har yanzu ƙasa da wancan ba tare da ƙara. Lokacin da abun ciki na HPMC6000 ya kasance ƙasa da 0.20%, tasiri akan ƙarfin 7-day da 28-day ƙarfi ba a bayyane yake ba, kuma ƙarfin matsawa na kwanaki 3 yana raguwa sannu a hankali. Lokacin da abun ciki na HPMC6000 ya karu zuwa 0.25% da sama, ƙarfin kwanakin 28 ya karu zuwa wani matsayi, sannan ya ragu; Ƙarfin 7-day ya ragu, sannan ya kasance barga; ƙarfin 3-day ya ragu cikin kwanciyar hankali. Saboda haka, ana iya la'akari da cewa ethers cellulose da biyu viscosities na HPMC2000 da HPMC6000 ba su da wani fili tabarbarewar sakamako a kan 28-day compressive ƙarfi na turmi, amma Bugu da kari na HPMC2000 yana da mafi bayyananne mummunan sakamako a kan farkon ƙarfin turmi.

HPMC2000 yana da digiri daban-daban na lalacewa akan ƙarfin sassauƙan turmi, komai a farkon matakin (kwanaki 3 da kwanaki 7) ko ƙarshen matakin (kwanaki 28). Bugu da kari na HPMC6000 kuma yana da wani mataki na mummunan tasiri a kan flexural ƙarfi na turmi, amma matakin tasiri ne karami fiye da na HPMC2000.

Bugu da ƙari, aikin riƙewar ruwa da kauri, cellulose ether kuma yana jinkirta tsarin hydration na ciminti. Yana da yafi saboda adsorption na cellulose ether kwayoyin a kan siminti hydration kayayyakin, kamar calcium silicate hydrate gel da Ca (OH) 2, don samar da wani sutura Layer; haka ma, danko na maganin pore yana ƙaruwa, kuma cellulose ether yana hana ƙaurawar Ca2 + da SO42- a cikin maganin pore yana jinkirta tsarin hydration. Saboda haka, ƙarfin farko (kwanaki 3 da kwanaki 7) na turmi gauraye da HPMC ya ragu.

Ƙara cellulose ether zuwa turmi zai samar da adadi mai yawa na manyan kumfa tare da diamita na 0.5-3mm saboda tasirin iska na ether cellulose, kuma an ƙaddamar da tsarin membrane cellulose ether a saman waɗannan kumfa, wanda zuwa wani iyaka yana taka rawa wajen daidaita kumfa. rawar, ta haka yana raunana tasirin defoamer a cikin turmi. Ko da yake kumfa da aka kafa kamar ball bearings a cikin sabon gauraye turmi, wanda ke inganta aikin aiki, da zarar turmi ya ƙarfafa kuma ya taurare, yawancin kumfa na iska suna zama a cikin turmi don samar da pores masu zaman kansu, wanda ke rage yawan adadin turmi. . Ƙarfin matsawa da ƙarfin sassauƙa suna raguwa daidai.

Ana iya ganin cewa lokacin shirya karfe slag yashi na musamman turmi tare da high fluidity, high ruwa riƙe kudi da kuma high ƙarfi, ana bada shawarar yin amfani da HPMC6000, da kuma sashi kada ya zama mafi girma 0.20%.

a karshe

Abubuwan da ke tattare da viscosities biyu na ethers cellulose (HPMC200 da HPMC6000) akan riƙewar ruwa, ruwa, matsawa da ƙarfi na turmi yashi na karfe slag an yi nazari ta hanyar gwaje-gwaje, kuma an bincika tsarin aikin ether cellulose a cikin turmi yashi slag. Ƙarshe masu zuwa:

(1) Ba tare da la'akari da ƙara HPMC2000 ko HPMC6000 ba, yawan riƙon ruwa na turmi mai yashi mai gauraye sabo yana iya inganta sosai, kuma ana iya inganta aikin riƙon ruwa.

(2) Lokacin da adadin ya kasance ƙasa da 0.20%, tasirin ƙara HPMC2000 da HPMC6000 akan ruwa na turmi yashi na karfe slag ba a bayyane yake ba. Lokacin da abun ciki ya karu zuwa 0.25% da sama, HPMC2000 da HPMC6000 suna da wani mummunan tasiri a kan ruwa na karfe slag sand turmi, kuma mummunan tasirin HPMC6000 ya fi bayyane.

(3) Bugu da kari na HPMC2000 da HPMC6000 ba shi da wani bayyananne sakamako a kan 28-day compressive ƙarfi na karfe slag yashi turmi, amma HPMC2000 yana da mafi girma mummunan tasiri a kan farkon matsa lamba ƙarfi na turmi, da flexural ƙarfi ne kuma a fili m. Bugu da kari na HPMC6000 yana da wani mummunan tasiri a kan flexural ƙarfi na karfe slag-yashi turmi a kowane zamani, amma mataki na sakamako ne muhimmanci kasa da na HPMC2000.