HPMC yana amfani da kankare

Gabatarwa

A halin yanzu, kumfa da ake yin kumfa za a iya amfani da ita kawai don yin kumfa mai kumfa idan yana da isasshen ƙarfi da kwanciyar hankali lokacin da aka haɗe shi da slurry kuma ba shi da wani mummunan tasiri a kan tashewa da taurin kayan siminti. Bisa ga wannan, ta hanyar gwaje-gwaje, an yi nazarin ƙara hydroxypropyl methyl cellulose (HPMC), wanda shine nau'i na nau'i na gyaran kumfa, don inganta aikin sake yin amfani da ƙananan foda mai kumfa.

Kumfa kanta ingancin mai kyau mara kyau kayyade ingancin kankare, musamman a cikin regenerative foda kumfa kankare, sharar gida kankare bayan crushing, ball niƙa foda, sanya ta da kansa zama da yawa m kuma tare da barbashi da pore na gefuna da sasanninta, idan aka kwatanta da talakawa kumfa. kankare, sake yin fa'ida foda kumfa a cikin kumfa kankare karkashin inji tasiri ya fi tsanani. Saboda haka, mafi kyau tauri, ƙananan pore size, uniformity da watsawa na kumfa a cikin slurry, mafi ingancin sake fa'ida micropowder foamed kankare. Duk da haka, yana da matukar muhimmanci a yi kumfa tare da babban tauri, daidai girman pore da siffar. A cikin aiwatar da yin amfani da wakili na kumfa, kumfa stabilizer yana taka muhimmiyar rawa. Yawancin kumfa stabilizer shine kayan manne, wanda zai iya ƙara danko na bayani kuma ya canza ruwa lokacin da aka narkar da shi cikin ruwa. Lokacin amfani da tare da kumfa wakili, kai tsaye ƙara ruwa fim danko na kumfa, yana ƙara elasticity na kumfa da surface ƙarfi na ruwa fim.1 gwaji

1.1 albarkatun kasa

(1) Siminti: 42.5 talakawan Portland siminti.

(2) Foda mai kyau da aka sake yin fa'ida: An zaɓi samfuran simintin da aka yi watsi da su a cikin dakin gwaje-gwaje a niƙa su zuwa ɓangarorin da girman barbashi ƙasa da 15mm ta muƙamuƙi, sannan a saka a cikin injin niƙa don niƙa. A cikin wannan gwaji, an zaɓi micropowder da aka shirya ta lokacin niƙa na 60min.

(3) Wakilin kumfa: wakili mai kumfa sabulu, ruwan rawaya mai haske mai tsaka tsaki.

(4) Kumfa stabilizer: hydroxypropyl methyl cellulose (HPMC), masana'antu kayan gini sa, foda, sauƙi mai narkewa a cikin ruwa.

(5) Ruwa: ruwan sha. Babban kayan jiki na kayan siminti .

1.2 Mix rabo zane da lissafi

1.2.1 Mix zane

A lokacin gwaji, zai iya ƙara ko rage sabunta foda kumfa kankare a cikin abun ciki, don daidaita girman da bushe yawa, ta hanyar kafa samfurin girma bambanci size, ainihin girman da zane zuwa m kimanta kuskure mataki na zane gwaji, sabunta foda kumfa. kankare fluidity na slurry size iko tsakanin 180 mm + 20 mm.

1.2.2 Ƙididdigar haɗakarwa

Kowane rabo zane gyare-gyare 9 kungiyoyin na daidaitattun tubalan (100mmx100mmx100mm), misali

Jimlar adadin gwajin toshe V0 = (0.1 × 0.1 × 0.1) x27 = 2.7 × 10-2m3, saita jimlar ƙarar V =

1.2 × 2.7 × 10-2 = 3.24 × 10-2m3, nau'in wakili mai kumfa M0 = 0.9V = 0.9 × 3.24 × 10-2 =

2.916 × 10-2kg, ruwan da ake buƙata don diluting wakili mai kumfa shine MWO.

2. Sakamakon gwaji da tattaunawa

Ta hanyar daidaita ma'auni na HPMC, an bincika tasirin tsarin kumfa daban-daban akan ainihin kaddarorin da aka sake yin fa'ida na ƙaramin foda mai kumfa. An gwada kayan aikin injiniya na kowane samfurin.

2.1 Tasirin sashi na HPMC akan aikin kumfa

Da farko, bari mu kalli “kumburin bakin ciki” da “kumfa masu kauri”. Kumfa shine tarwatsewar iskar gas a cikin ruwa. Ana iya raba kumfa zuwa "kumfa mai bakin ciki" tare da ƙarin ruwa da ƙarancin iskar gas da "kumfa mai kauri" tare da ƙarin ruwa da ƙarancin gas. Saboda kasancewar kumfa mai yawan gaske, da yawan ruwa mai yawa, slurry ɗin kumfa ɗin da aka yi ya zama sirara sosai, kuma ruwan kumfa yana da yawa, yana da sauƙin samar da magudanar nauyi, don haka simintin kumfa ɗin da aka sake yin fa'ida wanda aka shirya da ƙarancin ƙarfi, ƙari. da alaka pores, shi ne na baya kumfa. Gas mafi ruwa kasa kumfa, stoma samuwar ne m, kawai rabu da wani bakin ciki Layer na ruwa film, da jari na kumfa yawa ne in mun gwada da bakin ciki kumfa yawa, gyare-gyare daga cikin farfadowa da micro foda kumfa kankare rufaffiyar pores, high ƙarfi, shi ne high. - ingancin kumfa.

Tare da karuwa da adadin HPMC, yawan kumfa a hankali ya karu, yana nuna cewa kumfa yana da yawa, mai kumfa mai kumfa mai yawa a gaban 0.4% yana da wani tasiri mai mahimmanci, fiye da 0.4% bayan tasirin hanawa, yana nuna cewa danko na kumfa wakili bayani yana ƙaruwa, yana rinjayar ikon kumfa. Tare da karuwar adadin HPMC, ɓoyewar kumfa da nisa a hankali yana raguwa a lambobi. Kafin 0.4%, yawan raguwa yana da girma, kuma lokacin da adadin ya wuce 0.4%, ƙimar ta ragu, yana nuna cewa tare da karuwan maganin kumfa, ruwa a cikin fim din ruwa mai kumfa ba shi da sauƙin fitarwa ko fitarwa yana da yawa. ƙananan, kuma ruwan da ke tsakanin kumfa ba shi da sauƙi don gudana. Kumfa ruwa fim kauri yana raguwa sannu a hankali, lokacin fashe kumfa yana tsawaita, an haɓaka ƙarfin fim ɗin kumfa mai ƙarfi, kumfa kuma yana da wani matakin elasticity, don yin kwanciyar hankali na kumfa.

An inganta sosai. Ƙimar nisa na sasantawa bayan 0.4% kuma yana nuna cewa kumfa yana da inganci a wannan lokacin. Injin kumfa yana da wuyar yin kumfa a 0.8%, kuma aikin kumfa shine mafi kyau a 0.4%, kuma yawan kumfa shine 59kg / m3 a wannan lokacin.

2.2 Tasirin abun ciki na HPMC akan ingancin sake yin fa'ida na ƙaramin foda foamed kankare slurry

Tare da haɓaka abun ciki na HPMC, daidaiton slurry yana ƙaruwa. Lokacin da abun ciki ya kasance ƙasa da 0.4%, daidaito yana ƙaruwa sannu a hankali kuma a hankali, kuma lokacin da abun ciki ya fi 0.4%, ƙimar yana ƙaruwa sosai, yana nuna cewa kumfa yana da yawa, ƙarancin kumfa, kuma mafi girman kumfa. A cikin aiwatar da ƙara yawan adadin, yawan kumfa a cikin slurry shine mafi kyau a cikin kewayon 0.4% ~ 0.6%, kuma ingancin kumfa ba shi da kyau a waje da wannan kewayon. Lokacin da abun ciki ya kasance ƙasa da 0.4%, rarraba ramukan iska a cikin slurry yana da ɗanɗano iri ɗaya kuma yana nuna ci gaba na haɓakawa. Lokacin da abun ciki ya wuce wannan abun ciki, da rarraba iska pores nuna wani gagarumin m Trend, wanda kuma iya zama saboda da wuce kima yawa da danko na kumfa da matalauta fluidity, sakamakon da kumfa ba za a iya ko'ina tarwatsa a cikin slurry a lokacin stirring tsari. .

2.3 Tasirin abun ciki na HPMC akan aikin sake yin fa'ida na micropowder mai kumfa

Ko ta yaya aka samar da kumfa, girman kumfa a cikin kumfa ba zai taba zama iri ɗaya ba. Gwajin sake yin fa'ida sharar gida foda bayan murkushe tsarin nika, da siffar ba uniform, santsi a cikin kumfa da gauraye slurry hadawa, da wanda bai bi ka'ida ba siffar slurry da gefuna da sasanninta, spikes na barbashi iya samar da musamman m sakamako na kumfa, sun tuntube fiye da. a matsayin lamba na lamba tare da surface, samar da danniya taro, stabbing kumfa, haifar da kumfa fashe, don haka, Da shirye-shiryen da sake fa'ida micropowder kumfa kankare bukatar mafi girma kwanciyar hankali na kumfa. Hoto na 4 yana nuna tasirin tsarin tsarin kumfa daban-daban akan aikin sake yin fa'ida na micropowder foamed kankare.

Kafin 0.4%, busassun busassun ya ragu a hankali kuma adadin ya yi sauri, kuma an inganta shayar da ruwa. Bayan 0.4%, busassun busassun ya canza, kuma yawan sha ruwa yana ƙaruwa ba zato ba tsammani. A cikin 3D, ƙarfin matsawa ba shi da bambanci kafin 0.4%, kuma ƙimar ƙarfin yana kusan 0.9mpa. Bayan 0.4%, ƙimar ƙarfin ƙarami ne. Ƙarfin matsawa a 7d yana da bambanci a fili. Ƙimar ƙarfin ƙarfi a sashi na 0.0 a fili ba shi da girma kamar haka a 0.2% da 0.4%, amma mafi girma fiye da haka a 0.6% da 0.8%, kuma ƙimar ƙarfin a 0.2% da 0.4% har yanzu yana da ɗan bambanci. Canjin ƙimar ƙarfi a 28d daidai yake da wanda yake a 7d.

Sashi na 0.0 na asali yana nuna bakin ciki kumfa, kumfa taurin, kwanciyar hankali ba shi da kyau, a cikin aiwatar da slurry hadawa da samfurin condense sclerosis, akwai mai yawa kumfa breakage, da ciki porosity na samfurin ne mafi girma, bayan kafa samfurin yi ba shi da kyau, tare da. da karuwa da sashi, ta yi sannu a hankali samun mafi alhẽri, da kumfa a cikin slurry tarwatsa more a ko'ina kuma fashe zuwa wani karami digiri, Bayan gyare-gyaren, akwai ƙarin rufaffiyar ramukan a cikin ciki tsarin da samfurin, da kuma siffar, budewa da porosity na ramukan sun fi inganta, kuma aikin samfurin ya fi kyau. Nuna wani Trend na raguwa 0.4%, ƙarfi da darajar ba high kamar yadda 0.0, na iya zama saboda kumfa yawa da danko ya yi yawa, illiquid dalilin a kan aiwatar da hadawa slurry, kumfa ba zai iya Mix da siminti turmi, da kumfa iya ' t zama da kyau a cikin tarwatsawa a cikin slurry, wanda ke haifar da samar da samfurin shine girman nau'in nau'i daban-daban na kumfa, A sakamakon haka, akwai manyan ramuka da ramukan da aka haɗa a cikin samfurin bayan ƙarfafawa da taurin kai, wanda ya haifar da mummunan tsari. , Ƙarfin ƙarancin ƙarfi da yawan shayarwar ruwa na ramukan ciki na samfurin. A cikin adadi, babban dalilin canjin ƙarfin shine haɗin gwiwa na pore a cikin ɓangaren ciki na micropowder kumfa kankare.

Haɓaka tsarin kuma yana nuna cewa HPMC ba shi da wani tasiri akan hydration na siminti. Lokacin da abun ciki na HPMC ya kasance kusan a cikin kewayon 0.2% ~ 0.4%, ƙarfin sake yin fa'idar micropowder mai kumfa ya fi kyau.

3 ƙarshe

Kumfa abu ne da ya zama dole don yin kankare mai kumfa, kuma ingancinsa yana da alaƙa kai tsaye da ingancin simintin kumfa. Domin tabbatar da isasshen kwanciyar hankali na kumfa, an gauraya wakilin kumfa da HPMC don amfani. Daga nazarin kumfa, slurry da ingancin kankare na ƙarshe, an gano cewa:

(1) Bugu da ƙari na HPMC yana da sakamako mai kyau na ingantawa akan aikin kumfa. Idan aka kwatanta da 0.0, adadin kumfa mai kumfa ya karu da sau 1.8, yawan kumfa ya karu da 21 kg / m3, 1h ruwan zubar da jini ya ragu da 48 ml, 1h nisa ya ragu da 15 mm;

(2) da HPMC kara don inganta farfadowa na overall ingancin foda kumfa kankare slurry, idan aka kwatanta da ba Mix, da hankali kara da slurry daidaito, inganta liquidity da inganta kwanciyar hankali na slurry kumfa, bunkasa uniformity na kumfa. tarwatsawa a cikin slurry, rage ramin haɗin gwiwa, babban rami da kuma bayyanar abin da ya faru kamar yanayin rushewa, sashi na 0.4%, Bayan an yanke samfurin gyare-gyaren, budewar ta karami, siffar rami ya fi zagaye, da rarraba ramin ya fi uniform;

(3) Lokacin da abun ciki na HPMC ya kasance 0.2% ~ 0.4%, ƙarfin ƙarfin 28d na sake yin fa'ida na micropowder foamed kankare ya fi girma, amma la'akari da busassun busassun, shayar ruwa da ƙarfin farko, mafi kyawun lokacin abun ciki na HPMC shine 0.4%. A wannan lokacin, bushe yawa 442 kg/m3, 7d matsawa ƙarfi 2.2mpa, 28d matsa lamba ƙarfi 3.0mpa, ruwa sha 28%. HPMC tana taka rawa mai kyau a cikin aikin siminti mai kumfa mai kumfa da aka sake yin fa'ida, wanda ke nuna cewa HPMC yana da dacewa mai kyau da dacewa lokacin amfani da simintin simintin foda da aka sake yin fa'ida.