Tsarin aikin superplasticizer

(Superplasticizer mataki inji)

A karkashin yanayin cewa slump na kankare ne m guda, da admixture ga hadawa ruwa za a iya rage. Dangane da ƙimar rage yawan ruwa, ana iya raba shi zuwa na yau da kullun superplasticizer, superplasticizer, da babban aikin superplasticizer.

Babban ayyuka na superplasticizer:

Ƙara yawan ruwa. Lokacin amfani da ruwa da ruwa-ciminti rabo ne akai-akai, slump na kankare iya ƙara 100 ~ 200mm, kuma ba ya shafar ƙarfi na kankare.

Inganta ƙarfin kankare. A karkashin yanayin kiyaye ruwa da adadin siminti ba canzawa, ana iya rage yawan amfani da ruwa na hadawa da kashi 10% zuwa 40%, don haka rage yawan siminti na ruwa da inganta ƙarfin siminti.

Ajiye siminti. A karkashin yanayin kiyaye ruwa da ruwa-ciminti rabo ba canzawa, adadin ruwan hade da adadin siminti za a iya rage a lokaci guda.

Inganta karko na kankare.

A halin yanzu, gabaɗaya an yi imani da cewa tasirin rage ruwa na superplasticizer shine galibi saboda talla, watsawa, jika da lubrication na superplasticizer. A cikin tsarin hada siminti da ruwa, ma'adinan siminti sun ƙunshi sassa tare da cajin wutar lantarki daban-daban, kuma jawo hankalin juna na caji mai kyau da mara kyau zai haifar da tsarin flocculs na kankare. Hakanan za'a iya samar da tsarin flocculation saboda barbashin simintin suna karo da juna kuma suna jan hankalin juna a wasu gefuna da sasanninta saboda motsin thermal na siminti a cikin maganin. Saboda tsarin flocculation yana nannade wani ɓangare na gaurayewar ruwa kuma yana rage yawan ruwa, ana nuna tasirin superplasticizer a cikin abubuwa uku masu zuwa.

1. Superplasticizer wani abu ne mai aiki a saman, kuma kwayoyinsa sun ƙunshi ƙungiyar hydrophilic da ƙungiyar hydrophobic. Rukunin hydrophobic ana sanya shi a kai tsaye zuwa saman simintin siminti, kuma ƙungiyar hydrophilic tana nuna maganin ruwa, ta yadda saman simintin simintin yana da cajin lantarki iri ɗaya. Ƙarfin abin ƙyama yana raba ɓangarori na siminti, yana fitar da ions kyauta na tsarin flocculation, kuma yana ƙara yawan ruwa.

2. Ƙungiyar hydrophilic tana ɗaukar adadi mai yawa na kwayoyin ruwa na polar, yana ƙara kauri na fim ɗin ruwa mai narkewa a saman sassan siminti, yana taka rawa na lubrication kuma yana inganta aikin aiki.

3. Superplasticizer yana rage tashin hankali na sama, kuma ƙwayoyin simintin suna da sauƙin jika, wanda ya sa hydration ya fi dacewa, don inganta ƙarfin siminti.

Yanzu, an yarda gabaɗaya cewa akwai ra'ayoyi guda uku game da tsarin aikin superplasticizer: ka'idar repulsion electrostatic, ka'idar tasiri mai tsauri da ka'idar jinkirin sakin polymer.

Ka'idar repulsion na Electrostatic:

Yawancin superplasticizers sune anionic surfactants. Saboda siminti barbashi da tabbataccen cajin (Ca2+) a kan surface a farkon mataki na hydration, da anions SO3- da COO- a cikin superplasticizer kwayoyin za a adsorbed a kan siminti barbashi, forming wani adsorption biyu Layer, da kuma ciminti barbashi kusa da juna za a shafa da electrostatic repulsion da kuma vanity der a lokaci guda. Tare da haɓaka cikakkiyar ƙimar yuwuwar yuwuwar, ƙima tsakanin barbashi yana mamaye hankali a hankali, don haka yana hana haɗuwa tsakanin barbashi. a lokaci guda kuma, da electrostatic repulsion kuma iya saki ruwan nannade a cikin siminti barbashi, yin tsarin a cikin mai kyau da kuma barga watsawa yanayin. Tare da ci gaba na hydration, adadin raguwar ruwa da aka tallata a saman simintin siminti yana raguwa, ƙimar ƙimar yuwuwar ta ragu, kuma tsarin ba shi da ƙarfi, yana haifar da ƙima. Wannan ka'idar ta fi dacewa da jerin naphthalene, jerin melamine da gyare-gyaren tsarin calcium na itace da sauran na'urorin da ake amfani da su na yau da kullun.

Ka'idar tasiri mai hanawa:

Wannan ka'idar ta fi dacewa da polycarboxylate superplasticizer. Lokacin da kauri na adsorption Layer a saman simintin siminti ya karu, yana da amfani ga simintin siminti don tarwatsawa da sakin ruwan kyauta tsakanin sassan siminti. Kasancewar babban adadin sarƙoƙin gefe-siffa (CH2-CH2-O) n-a cikin ƙwayoyin polymer na polycarboxylic superplasticizers yana sa tsarin ƙwayoyin ƙwayoyin cuta ya zama siffa kuma ya samar da babban Layer adsorption akan saman simintin siminti. Tasirin rage ruwa ya fi faruwa ne ta hanyar ƙwaƙƙwaran ƙwaƙƙwaran da ke haifar da sarƙoƙin macromolecular da sarƙoƙi masu reshe. Bayan da aka daɗe ana adsorbed sarƙoƙi masu rassa a saman sassan siminti, za a iya samun ƙulli mai girma uku mai kauri a saman sassan siminti, ta yadda simintin zai iya samun sakamako mai kyau da dindindin.

Ka'idar jinkirin sakin polymers masu amsawa:

Wannan ka'idar tayi kama da ka'idar tasiri mai tsauri, kuma galibi ana amfani da ita a cikin binciken rage ruwa da kariyar slump na jerin polycarboxylic acid babban aikin superplasticizer. Lokacin da kwayoyin polymerization na polycarboxylate superplasticizer ya ƙunshi ester ko anhydride, wani nau'in nau'in nau'i ne na ƙwayoyin lafiya na polymer marasa narkewa. A cikin mahallin alkaline na kankare, ƙungiyar carboxyl ana cajin mummunan caji ta hanyar tallan simintin siminti, wanda ke haifar da rarrabuwar wutar lantarki tsakanin simintin siminti yana taka rawa ta biyu, ƙara rarrabuwar siminti kuma, jinkirta saitin siminti, da hana asarar siminti.

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(Superplasticizer mataki inji)