Hnub Kawg: Lub Yim Hli 7, 2023

1. Teem sijhawm
Cellulose ether muaj qee yam cuam tshuam rau cov tshuaj khib nyiab. Raws li cov ntsiab lus ntawm cellulose ether nce, lub sij hawm teem ntawm lub mortar kuj prolongs. Cov nyhuv retarding ntawm cellulose ether ntawm cov cement slurry feem ntau yog nyob ntawm qhov kev hloov pauv ntawm alkyl, thiab tsis cuam tshuam nrog nws qhov hnyav molecular. Qhov qis dua qhov kev hloov pauv ntawm alkyl, qhov ntau dua cov ntsiab lus hydroxyl, thiab qhov pom tseeb dua cov nyhuv retarding. Tsis tas li ntawd, nrog cov ntsiab lus siab ntawm cellulose ether, txheej zaj duab xis complex muaj qhov cuam tshuam loj dua rau kev ncua sij hawm thaum ntxov ntawm cov cement, yog li ntawd, cov nyhuv retarding kuj pom tseeb dua.

2.Bending zog thiab compressive zog
Feem ntau, lub zog yog ib qho tseem ceeb ntawm kev ntsuas ntsuas rau kev kho cov nyhuv ntawm cov cement-based cementitious cov ntaub ntawv ntawm cov khoom sib tov. Qhov nce hauv cov ntsiab lus ntawm cellulose ether yuav txo tau lub zog compressive thiab flexural zog ntawm cov tshuaj khib.

3. Bond zog
Cellulose ether muaj qhov cuam tshuam loj rau kev sib koom ua ke ntawm mortar. Cellulose ether tsim ib zaj duab xis polymer nrog cov nyhuv sealing ntawm cov cement hydration hais nyob rau hauv cov kua theem system, uas txhawb nqa cov dej ntau dua hauv cov yeeb yaj kiab polymer sab nraum cov cement hais, uas yog qhov tsim nyog rau kev ua tiav cov dej ntawm cov cement, yog li txhim kho kev sib raug zoo. lub zog ntawm hardened slurry. Nyob rau tib lub sijhawm, tus nqi tsim nyog ntawm cellulose ether txhim kho cov yas thiab hloov tau 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, nws txhim kho cov txiaj ntsig kev sib txuas ntawm mortar thiab substrate. Tsis tas li ntawd, vim muaj cov cellulose ether nyob rau hauv cov cement slurry, ib qho kev hloov pauv tshwj xeeb hauv cheeb tsam thiab cov txheej txheem interface yog tsim los ntawm cov khoom khib nyiab thiab cov khoom siv dej. Cov txheej txheem txheej txheej no ua rau thaj chaw hloov pauv hloov pauv tau yooj yim dua thiab tsis nruj, yog li muab cov tshuaj khib nyiab muaj zog sib txuas.