Menene Superplasticizer Yayi a Kankare?

(Menene Superplasticizer Yayi a Kankare?)

Superplasticizer wani ƙari ne wanda ke canza kaddarorin siminti. Wani sinadari ne da ke sa kankare kwarara cikin sauki. Duk da haka, wannan sinadari yana buƙatar wasu canje-canje a cikin hanyoyin kankare. Ya kamata a daidaita ma'auni na ciminti da yashi, da ma'auni na superplasticizer. Babban simintin da ke gudana yana haifar da ƙarin matsa lamba akan nau'ikan, wanda dole ne a tsara shi don tsayayya da matsa lamba. Irin wannan siminti kuma yana da wahalar sanyawa a kan gangara. Ko da yake superplasticizers suna ba da wasu ƙarin fa'idodi, wuce gona da iri na iya samun sakamako mara kyau.

Tasiri kan raguwa

Superplasticizer wani sinadari ne da ake saka shi cikin siminti don inganta faɗuwar sa. Tasirinsa ya dogara da nau'in superplasticizer da aka yi amfani da shi, da ruwa zuwa rabon siminti, da zafin jiki da lokacin ƙari. Idan aka ƙara superplasticizer, mafi girman haɓakar slump. Koyaya, ba za a iya ƙara adadin superplasticizer sama da adadin da aka ba da shawarar ba.

Amfani da superplasticizers yana da fa'idodi masu yawa a cikin samar da kankare. Duk da haka, suna iya haifar da hasara mai mahimmanci. Yana da mahimmanci a yi la'akari da tasirin dangi na daban-daban admixtures, kayan aiki, da hanyoyin samarwa akan slump. Bugu da ƙari, zai zama dole don nazarin daidaituwa na superplasticizer tare da sauran admixtures. Wasu abubuwan da ke tasiri slump sune yanki na ƙasa, abun cikin siminti, da abun cikin sulfate.

Adsorption ta C3A na superplasticizers

Superplasticizers su ne mahadi waɗanda ke ɗaure a saman sassan siminti. Tasirin yana yin sulhu ta hanyar electrostatic da stric repulsion. Wannan hulɗar tsakanin siminti da superplasticizers ya kasance babban batun bincike na shekaru da yawa da suka gabata. Duk da haka, ainihin tsarin bai bayyana ba tukuna.

Duk da yake wasu superplasticizers suna da babban kusanci ga cubic C3A, suna nuna ƙarancin kusanci ga orthorhombic C3A. Saboda haka, tasirin superplasticisers akan orthorhombic C3A hydration yana da ƙananan.

Tasiri akan masu gyara danko

Yin amfani da superplasticizer a cikin siminti na iya samun fa'idodi da yawa, gami da haɓaka kaddarorin simintin da inganta karɓuwar samfurin da ya gama. Hakanan yana iya inganta ƙarfin siminti, kuma ana iya amfani dashi don cika kogo. Duk da haka, yin amfani da superplasticizer a cikin kankare yana da illa, ciki har da amfani da yawan adadin superplasticizer da sedimentation.

Bugu da ƙari, yana iya haifar da zubar jini, rabuwa, da canje-canje a cikin yashi. Bugu da ƙari, ƙaƙƙarfan SCC yana bawa mai siyar da kankare damar sadar da daidaitaccen tsari, yana rage buƙatar gyare-gyaren rukunin yanar gizon. Bugu da ƙari, babban abun ciki na VMA na iya rage bambancin SCC.

Tasiri akan iya aiki

Superplasticizers na iya inganta aikin kankare ta hanyar rage abun ciki na ruwa har zuwa 30%. Bugu da kari, sun jinkirta warkewar siminti ta hanyar kawar da abubuwan jan hankali a tsakanin sassan siminti. Wannan yana rage wuraren buɗewa a cikin siminti, wanda ke ƙara ƙarfi. Yin amfani da waɗannan additives na iya ƙara yawan aiki na kankare, amma ya kamata a yi amfani da hankali lokacin yanke shawara akan adadin da ya dace.

Yawanci, adadin superplasticizers da ake amfani da su a cikin gaurayawan kankare ya bambanta daga lita ɗaya zuwa uku a kowace mita mai siffar sukari. Dangane da nau'in haɗin kai na kankare, sashi na iya ƙarawa ko rage rabon siminti na ruwa. Don ƙayyade ainihin adadin da ake buƙata, ana amfani da gwajin Marsh Cone.

Nau'in superplasticizers

An tsara nau'ikan nau'ikan superplasticizers don takamaiman aikace-aikacen a cikin masana'antar siminti. Ana amfani da waɗannan abubuwan ƙari a cikin matakin kai, ƙarfi mai ƙarfi, da siminti mai girma. Suna taimakawa rage bushewa shrinkage da ƙara gaba ɗaya karko na kankare. Misali, superplasticizers suna rage girman canjin siminti bayan ya gama warkewa.

Superplasticizers su ne macromolecules masu narkewa waɗanda suke da ɗaruruwan lokuta girma fiye da kwayoyin ruwa. Suna aiki ne ta hanyar ɗaure da kankare da kuma sakin ruwa da ke makale ta hanyar tunkuɗar ƙwayoyin da aka caje. Tsarin aikin su ya bambanta da na WRA, wanda zai iya rage aikin siminti.

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(Menene Superplasticizer Yayi a Kankare?)