Cov nyhuv ntawm cellulose ether rau kev ntswj ntawm cov yas dawb ntawm cov mortar

1. Kev tshawb fawb keeb kwm yav dhau los ntawm cov nyhuv ntawmcellulose etherntawm cov yas tsis muaj kev ntswj ntawm cov mortar

Cov av nplaum yog ib yam khoom siv dav hauv cov haujlwm tsim kho, thiab qhov ruaj khov ntawm nws cov kev ua tau zoo muaj qhov cuam tshuam tseem ceeb rau qhov zoo ntawm cov tsev. Cov yas tsis muaj qhov ntsws yog ib qho xwm txheej uas yuav tshwm sim hauv cov av nplaum ua ntej tawv, uas yuav ua rau muaj teeb meem xws li tawg hauv cov av nplaum, cuam tshuam rau nws qhov ruaj khov thiab kev zoo nkauj. Cellulose ether, ua ib qho khoom siv ntxiv rau hauv cov av nplaum, muaj qhov cuam tshuam tseem ceeb rau qhov yas tsis muaj qhov ntsws ntawm cov av nplaum.

2. Lub hauv paus ntsiab lus ntawm cellulose ether txo cov yas dawb shrinkage ntawm mortar

Cellulose ether muaj kev khaws dej zoo heev. Kev poob dej hauv cov mortar yog ib qho tseem ceeb ua rau cov yas tsis muaj kev ntsws. Cov pab pawg hydroxyl ntawm cov cellulose ether molecules thiab cov pa oxygen ntawm cov ether bonds yuav tsim cov hydrogen bonds nrog cov dej molecules, hloov cov dej dawb mus rau hauv dej khi, yog li txo cov dej poob. Piv txwv li, hauv qee qhov kev tshawb fawb, nws tau pom tias nrog kev nce ntawm cellulose ether koob tshuaj, tus nqi poob dej hauv mortar txo qis linearly. Zoo limethyl hydroxypropyl cellulose ether (HPMC), thaum cov koob tshuaj yog 0.1-0.4 (feem pua ​​​​​​ntawm pawg), nws tuaj yeem txo qhov dej poob ntawm cov cement mortar los ntawm 9-29%.

Cellulose ether txhim kho cov khoom rheological, cov qauv porous network thiab osmotic siab ntawm cov cement tshiab, thiab nws cov khoom tsim zaj duab xis cuam tshuam kev sib kis ntawm dej. Cov txheej txheem no ua ke txo qhov kev ntxhov siab los ntawm kev hloov pauv dej noo hauv cov mortar, yog li tiv thaiv kev ntsws yas dawb.

3. Cov nyhuv ntawm cellulose ether dosage rau ntawm cov yas dawb shrinkage ntawm mortar

Cov kev tshawb fawb tau qhia tias qhov kev ntsws ntawm cov cement mortar uas tsis muaj yas txo qis linearly nrog rau qhov nce ntawm cellulose ether koob tshuaj. Piv txwv li, siv HPMC, thaum qhov koob tshuaj yog 0.1-0.4 (feem ntau), qhov kev ntsws ntawm cov cement mortar uas tsis muaj yas tuaj yeem txo tau 30-50%. Qhov no yog vim tias thaum qhov koob tshuaj nce ntxiv, nws cov dej khaws cia thiab lwm yam kev cuam tshuam kev ntsws txuas ntxiv mus.

Txawm li cas los xij, qhov koob tshuaj ntawm cellulose ether tsis tuaj yeem nce ntxiv mus tas li. Ntawm ib sab tes, los ntawm qhov pom ntawm kev lag luam, ntxiv ntau dhau yuav ua rau tus nqi nce ntxiv; ntawm qhov tod tes, ntau dhau cellulose ether yuav muaj kev cuam tshuam tsis zoo rau lwm yam khoom ntawm mortar, xws li lub zog ntawm mortar.

4. Qhov tseem ceeb ntawm kev cuam tshuam ntawm cellulose ether rau ntawm cov yas dawb shrinkage ntawm mortar

Los ntawm qhov kev xav ntawm kev siv tshuab ua haujlwm, kev ntxiv cellulose ether rau hauv cov mortar tuaj yeem txo qhov kev ntsws yas dawb, yog li txo qhov tshwm sim ntawm cov kab nrib pleb. Qhov no yog qhov tseem ceeb heev rau kev txhim kho qhov zoo ntawm cov tsev, tshwj xeeb tshaj yog rau kev txhim kho qhov ruaj khov ntawm cov qauv xws li phab ntsa.

Hauv qee qhov project tshwj xeeb uas muaj cov kev xav tau siab rau qhov zoo ntawm cov mortar, xws li qee lub tsev nyob siab thiab cov tsev pej xeem loj, los ntawm kev tswj hwm qhov cuam tshuam ntawm cellulose ether rau qhov tsis muaj yas shrinkage ntawm mortar, nws tuaj yeem ua kom ntseeg tau tias qhov project ua tau raws li cov qauv zoo.

5. Kev tshawb nrhiav yav tom ntej

Txawm hais tias muaj qee qhov kev tshawb fawb txog kev cuam tshuam ntawm cellulose ether rau qhov tsis muaj yas shrinkage ntawm mortar, tseem muaj ntau yam uas tuaj yeem tshawb nrhiav tob. Piv txwv li, cov txheej txheem cuam tshuam ntawm ntau hom cellulose ethers rau qhov tsis muaj yas shrinkage ntawm mortar thaum lawv ua haujlwm ua ke nrog lwm cov khoom ntxiv.

Nrog rau kev txhim kho tas mus li ntawm cov thev naus laus zis kev tsim kho, qhov yuav tsum tau ua kom cov mortar ua haujlwm tau zoo kuj nce ntxiv tas li. Yuav tsum muaj kev tshawb fawb ntxiv txog yuav ua li cas thiaj tswj tau qhov kev siv cellulose ether hauv mortar kom raug dua kom ua tiav qhov zoo tshaj plaws ntawm kev tiv thaiv kev ntsws yas dawb thaum xav txog lwm yam khoom ntawm mortar.