Cellulose ether muaj qee yam cuam tshuam rau cov mortar. Nrog rau kev nce ntxiv ntawm cov tshuaj ntawm cellulose ether, lub sijhawm teeb tsa ntawm cov mortar ntev dua. Qhov cuam tshuam ntawm cellulose ether rau ntawm cov cement paste feem ntau nyob ntawm qib ntawm kev hloov pauv ntawm alkyl pawg, thaum tsis muaj feem cuam tshuam nrog nws qhov hnyav molecular.
Qhov me dua qhov degree ntawm alkyl hloov, qhov loj dua cov hydroxyl cov ntsiab lus, thiab qhov ntau dua qhov cuam tshuam retarding. Thiab qhov ntau dua cov koob tshuaj ntawm cellulose ether, qhov ntau dua qhov cuam tshuam qeeb ntawm cov txheej zaj duab xis complex rau qhov ntxov hydration ntawm cement, yog li qhov cuam tshuam retarding kuj tseem pom tseeb dua.
Lub zog yog ib qho ntawm cov ntsuas tseem ceeb rau kev kho cov nyhuv ntawm cov cement-based cementitious cov khoom sib xyaw. Thaum cov tshuaj cellulose ether ntau ntxiv, lub zog compressive thiab flexural ntawm mortar yuav txo qis. Lub zog tensile bonding ntawm cement mortar sib xyaw nrog cellulose ether tau zoo dua; Lub zog flexural thiab compressive ntawm cement mortar raug txo qis, thiab qhov ntau dua cov tshuaj, qhov qis dua lub zog;
Tom qab sib tov hydroxypropyl methyl cellulose ether, nrog rau kev nce ntxiv ntawm cov koob tshuaj, lub zog flexural ntawm cov cement mortar thawj zaug nce thiab tom qab ntawd txo qis, thiab lub zog compressive maj mam txo qis. Qhov tshuaj zoo tshaj plaws yuav tsum tau tswj hwm ntawm 0.1%.
Cellulose ether muaj feem cuam tshuam loj heev rau kev sib txuas ntawm cov mortar. Cellulose ether tsim cov zaj duab xis polymer nrog cov nyhuv sealing ntawm cov cement hydration hauv cov kua theem system, uas txhawb kom muaj dej ntau dua hauv cov zaj duab xis polymer sab nraum cov cement, uas yog qhov zoo rau kev ua kom tiav ntawm cov cement, yog li txhim kho lub zog sib txuas ntawm cov nplaum tom qab hardening.
Tib lub sijhawm, qhov ntau ntawm cellulose ether tsim nyog ua rau cov plasticity thiab kev ywj pheej ntawm cov mortar, txo qhov rigidity ntawm thaj chaw hloov pauv ntawm cov mortar thiab lub substrate interface, thiab txo qhov muaj peev xwm swb ntawm cov interfaces. Mus rau qee qhov, qhov cuam tshuam ntawm kev sib txuas ntawm cov mortar thiab lub substrate yog txhim kho.
Tsis tas li ntawd xwb, vim muaj cellulose ether nyob rau hauv cov cement paste, ib cheeb tsam hloov pauv tshwj xeeb thiab txheej interface tau tsim ntawm cov khoom mortar thiab cov khoom hydration. Cov txheej interface no ua rau thaj chaw hloov pauv interface yooj ywm dua thiab tsis nruj heev. Yog li, nws ua rau cov mortar muaj zog sib txuas.
Lub sijhawm tshaj tawm: Lub Rau Hli-02-2023