Cellulose ether muaj qee yam cuam tshuam rau cov tshuaj khib nyiab. Nrog rau qhov nce ntawm qhov ntau npaum ntawm cellulose ether, lub sij hawm teem caij ntawm lub mortar prolongs. Cov nyhuv retarding ntawm cellulose ether ntawm cov cement paste feem ntau yog nyob ntawm qhov kev hloov pauv ntawm cov pab pawg alkyl, thaum muaj me ntsis ua rau nws qhov hnyav molecular.
Qhov me me ntawm qhov kev hloov pauv ntawm alkyl, qhov loj dua cov ntsiab lus hydroxyl, thiab qhov pom tseeb dua cov nyhuv retarding. Thiab qhov ntau dua ntawm cov cellulose ether ntau dua, qhov pom tseeb dua qhov cuam tshuam ntawm cov zaj duab xis complex ntawm cov cement thaum ntxov, yog li cov nyhuv retarding kuj pom tseeb dua.
Lub zog yog ib qho ntawm cov kev ntsuas tseem ceeb rau kev kho cov nyhuv ntawm cov cement-based cementitious cov ntaub ntawv ntawm qhov sib tov. Thaum cov koob tshuaj ntawm cellulose ether nce, lub zog compressive thiab flexural zog ntawm mortar yuav txo. Lub zog tensile lub zog ntawm cov cement mortar tov nrog cellulose ether yog txhim kho; Lub zog flexural thiab compressive ntawm cov cement mortar raug txo, thiab qhov ntau npaum li cas, lub zog qis dua;
Tom qab sib tov hydroxypropyl methyl cellulose ether, nrog rau qhov nce ntawm ntau npaum, lub zog flexural ntawm cement mortar thawj zaug nce thiab tom qab ntawd txo qis, thiab lub zog compressive maj mam txo. Qhov kev pom zoo noj yuav tsum tau tswj ntawm 0.1%.
Cellulose ether muaj kev cuam tshuam zoo rau kev sib koom ua ke ntawm mortar. Cellulose ether ua ib zaj duab xis polymer nrog cov nyhuv sealing ntawm cov cement hydration hais nyob rau hauv cov kua theem system, uas txhawb nqa dej ntau nyob rau hauv lub polymer zaj duab xis sab nraum cov cement hais, uas yog conducive mus rau tag nrho cov hydration ntawm cov cement, yog li txhim kho lub zog ntawm daim ntawv cog lus. ntawm paste tom qab hardening.
Nyob rau tib lub sijhawm, tus nqi tsim nyog ntawm cellulose ether txhim kho cov yas thiab yooj yim ntawm cov tshuaj khib nyiab, txo qhov rigidity ntawm txoj kev hloov chaw ntawm cov mortar thiab substrate interface, thiab txo cov zawv zawg muaj peev xwm ntawm cov interfaces. Rau qee qhov, qhov kev sib txuas ntawm cov tshuaj khib thiab cov substrate tau txhim kho.
Tsis tas li ntawd, vim muaj cov cellulose ether nyob rau hauv cov cement paste, ib qho kev hloov pauv tshwj xeeb hauv cheeb tsam thiab cov txheej txheem cuam tshuam tau tsim los ntawm cov khoom khib nyiab thiab cov khoom siv dej. Cov txheej txheem interface no ua rau thaj chaw hloov pauv hloov pauv tau yooj yim dua thiab tsis nruj. Yog li, nws ua rau lub mortar muaj zog daim ntawv cog lus.
Post lub sij hawm: Jun-02-2023