Kwanan Wata: 20 ga Yuni, 2022

3. Tsarin aikin superplasticizers

The inji na ruwa rage wakili don inganta fluidity na kankare cakuda yafi hada da dispersing sakamako da lubricating sakamako. The ruwa rage wakili ne ainihin surfactant, daya karshen dogon kwayoyin sarkar ne sauƙi mai narkewa a cikin ruwa - hydrophilic kungiyar, da sauran karshen ne insoluble a cikin ruwa - hydrophobic kungiyar.

a. Watsawa: Bayan an haxa siminti da ruwa, saboda sha'awar ƙwayoyin simintin siminti, slurry na siminti ya zama tsarin flocculation, ta yadda 10% zuwa 30% na ruwan hadawa an nannade shi a cikin siminti kuma ba zai iya shiga cikin kyauta ba. kwarara da lubrication. sakamako, game da shi rinjayar da fluidity na kankare cakuda. Lokacin da aka ƙara wakili mai rage ruwa, saboda za'a iya tallata kwayoyin cutar rage ruwa a saman simintin siminti, saman simintin simintin yana da caji iri ɗaya (yawanci caji mara kyau), yana haifar da sakamako na repulsion electrostatic, wanda ya haifar da sakamako na electrostatic. yana inganta watsawar simintin siminti da lalata tsarin flocculation. , saki ɓangaren nannade na ruwa kuma shiga cikin magudanar ruwa, ta yadda za a ƙara yawan ruwa na cakuda kankare.

b. Lubrication: ƙungiyar hydrophilic a cikin superplasticizer yana da iyakacin iyaka, don haka fim ɗin adsorption na superplasticizer a saman simintin siminti zai iya samar da fim ɗin barga mai narkewa tare da kwayoyin ruwa, kuma wannan fim ɗin na ruwa yana da mai kyau Lubrication na iya rage zamewar yadda ya kamata. juriya tsakanin siminti barbashi, game da shi kara inganta fluidity na kankare.

Tasirin mai rage ruwa akan kankare, da sauransu:

a. Saita lokaci. Superplasticizers gabaɗaya ba su da wani tasiri na ja da baya, kuma suna iya haɓaka hydration da taurin siminti. Retarded superplasticizer wani hadadden superplasticizer da retarder. A karkashin yanayi na al'ada, don jinkirta jinkirin ciminti da kuma rage hasara na raguwa, an ƙara wani adadin raguwa zuwa wakili na rage ruwa.

b. Gas abun ciki. A halin yanzu, na'urar rage ruwa ta polycarboxylate da aka saba amfani da ita tana da takamaiman abin da ke cikin iska, kuma abun da ke cikin simintin bai kamata ya yi yawa ba, in ba haka ba ƙarfin kankare zai ragu sosai.

c. Riƙewar ruwa.

Superplasticizers ba su taimaka sosai don rage zubar da jini na kankare ba, har ma yana iya ƙara zubar jini. Zubar da jini na kankara yana ƙaruwa lokacin da adadin ya wuce kima.