MHEC nyob rau hauv permeable cement mortar

1. Cov yam ntxwv tseem ceeb ntawm MHEC

MHEC (Methyl Hydroxyethyl Cellulose)yog ib qho cellulose ether uas tsis yog ionic nrog kev ua kom tuab zoo, khaws dej, tsim zaj duab xis thiab txhim kho kev ua haujlwm ntawm kev tsim kho. Hauv cov ntaub ntawv tsim kho uas ua los ntawm cement, MHEC tuaj yeem txhim kho qhov fluidity, khaws dej, tiv thaiv kev tawg thiab kev nplaum ntawm cov mortar, thiab siv dav hauv cov nplaum pobzeb, hmoov putty, self-leveling mortar, mortar tsis muaj dej thiab permeable cement mortar. Vim nws muaj qhov cuam tshuam me me rau cov txheej txheem cement hydration thiab kev sib raug zoo nrog ntau yam admixtures, MHEC tau dhau los ua cov khoom siv hloov kho organic tseem ceeb rau permeable cement mortar.

2. Cov yam ntxwv ntawm cov cement mortar permeable

Cov cement mortar uas nkag tau yog hais txog cov mortar tshwj xeeb uas tuaj yeem nkag mus rau hauv lub hauv paus los ntawm kev ua haujlwm capillary, thiab feem ntau siv rau hauv kev kho cov qauv, kev txhawb nqa thiab cov haujlwm tiv thaiv dej. Hom mortar no yuav tsum muaj:

Zoo permeability: muaj peev xwm nkag mus rau hauv cov qhov me me ntawm cov txheej hauv paus thiab txhim kho qhov ceev ntawm cov khoom siv hauv paus;

Kev ntws zoo: ntws zoo thiab permeability yam tsis muaj kev los ntshav loj thiab kev faib ua pawg;

Kev nplaum ruaj khov thiab ruaj khov: xyuas kom meej tias muaj kev sib txuas ruaj khov nrog cov khoom siv hauv paus thiab ua lub luag haujlwm txhawb nqa thiab tiv thaiv mus sij hawm ntev;

Kev khaws dej nruab nrab: txo qhov poob dej sai sai thaum lub sijhawm tsim kho thiab xyuas kom meej tias cov cement tau hydrated tag nrho.

Lub luag haujlwm ntawm MHEC feem ntau yog tsom mus rau kev txhim kho cov dej ntws, kev khaws dej thiab kev ua haujlwm ntawm cov mortar, thaum tsis ncaj qha txhim kho qhov cuam tshuam ntawm kev nkag mus.

3. Cov nyhuv ntawm MHEC rau kev ua tau zoo ntawm cov cement mortar permeable

3.1. Txhim kho kev khaws dej thiab txhawb kom nkag mus tob

Cov pob zeb uas nkag tau yuav tsum tswj tau qhov sib xws thiab cov dej noo kom zoo ua ntej nkag mus rau hauv cov qhov capillary ntawm cov txheej hauv paus. MHEC muaj cov dej khaws cia zoo heev, uas tuaj yeem txo qhov kev ua kom sai ntawm cov dej dawb thiab kev nqus los ntawm cov khoom siv hauv paus thaum lub sijhawm tsim cov pob zeb, ua kom lub sijhawm nkag mus ntawm cov pob zeb ntev dua, thiab ua kom qhov tob nkag mus ntxiv. Tsis tas li ntawd, kev faib dej sib npaug kuj tseem ua rau cov cement noo tag nrho hauv theem tom qab, txhim kho qhov ceev thiab kev ruaj khov.

3.2. Txhim kho kev ua haujlwm thiab kev ua haujlwm ntawm kev tsim kho

MHEC tuaj yeem kho cov khoom rheological ntawm cov cement mortar uas nkag tau, kom nws tuaj yeem tswj tau qhov kev tsim kho zoo hauv qab qhov sib piv dej-cement qis. Kev ntxiv MHEC kom raug tuaj yeem txo qhov kev ntws thiab kev sib cais ntawm cov mortar, thiab xyuas kom meej tias cov slurry nkag mus rau hauv cov qhov me me ntawm cov substrate. Rau cov mortar uas nkag tau uas yuav tsum tau nchuav lossis txau, MHEC tuaj yeem txhim kho kev ua haujlwm twj thiab kev sib npaug, ua rau cov mortar yooj yim dua rau kev tsim kho.

3.3. Txhim kho qhov kev sib txuas ntawm cov mortar thiab substrate

Vim yog lub zog ua zaj duab xis ntawm MHEC, ib zaj duab xis organic uas yoog tau tuaj yeem tsim tau ntawm qhov sib tshuam thaum lub sijhawm ua kom tawv ntawm cov mortar, uas ua rau kom muaj kev sib txhuam thiab kev sib txuas ntawm cov mortar thiab cov substrate. Qhov kev hloov pauv interface no pab tiv thaiv cov mortar kom tsis txhob tev tawm ntawm cov substrate thiab txhim kho qhov ruaj khov ntawm cov txheej kho permeable.

3.4. Txhim kho qhov tiv taus qhov tawg thiab tswj kev ntsws

Vim yog qhov ceev ntawm sab hauv, cov mortar permeable feem ntau yuav tawg thaum lub sijhawm hardening. Qhov cuam tshuam ntawm MHEC khaws dej tuaj yeem ua rau qeeb qeeb ntawm cov mortar shrinkage, ua rau cov cement hydration txaus, thiab txo qhov tshwm sim ntawm cov yas shrinkage tawg. Tib lub sijhawm, cov khoom ua zaj duab xis ntawm MHEC muab cov mortar qee qhov kev ywj pheej, txhim kho qhov kev tiv thaiv kab nrib pleb thiab kev ruaj khov.

3.5. Kev ncua lub sijhawm teeb tsa thawj zaug yog qhov zoo rau kev tsim kho

MHEC muaj qhov cuam tshuam me ntsis rau cov txheej txheem hydration ntawm cov cement, uas pab ua kom lub sijhawm ua haujlwm ntawm cov mortar ntev dua. Rau cov haujlwm kho uas xav tau kev nkag mus tag nrho, lub sijhawm tsim kho ntev dua ua rau nws yooj yim dua rau cov slurry nkag mus rau hauv txheej hauv qab, txhim kho cov txiaj ntsig kho thiab kev ruaj khov zoo.

3.6. Txhim kho qhov kev ua haujlwm tiv thaiv kev ntws thiab kev tiv thaiv dej

Hauv cov mortar uas tau tawv thiab permeable, vim MHEC txhim kho qhov ceev thiab kev sib txuas ntawm cov mortar, nws cov qauv capillary yog sib npaug ntau dua, qhov porosity raug txo qis, thiab lub peev xwm tiv thaiv kev seepage tau zoo dua. Hauv kev tiv thaiv dej hauv av, kev tsim cov qhov av, pas dej thiab lwm yam haujlwm, MHEC-modified permeable mortar tuaj yeem tiv thaiv kev ya raws thiab txhim kho cov nyhuv tiv thaiv dej.

4. Ntxiv tus nqi thiab kev ceev faj rau kev siv

Tus nqi ntxiv uas pom zoo: feem ntau yog 0.2% txog 0.6% ntawm qhov hnyav ntawm cov khoom siv cementitious, uas yuav tsum tau kho raws li qhov sib piv ntawm dej-cement, mortar fluidity thiab cov txheej txheem kev tsim kho.

Tsis txhob ntxiv ntau dhau: Kev siv MHEC ntau dhau yuav ua rau cov mortar viscosity ntau dhau, txo qhov permeability, thiab tej zaum yuav ncua qhov cement coagulation ntau dhau.

Kev sib raug zoo nrog lwm cov admixtures: Hauv cov mortars permeable uas muaj cov dej reducers, cov neeg sawv cev entraining cua lossis cov neeg sawv cev nthuav dav, qhov koob tshuaj zoo tshaj plaws ntawm MHEC yuav tsum tau txiav txim siab los ntawm kev sim kom ntseeg tau tias muaj kev ua tau zoo synergy.

Hauv cov cement mortar uas nkag tau yooj yim, MHEC txhim kho qhov tob ntawm kev nkag mus, kev nplaum, kev tiv thaiv kab nrib pleb thiab kev ruaj khov ntawm cov mortar los ntawm nws cov khoom zoo heev ntawm kev khaws cia dej, kev tuab, kev tsim zaj duab xis thiab kev hloov kho rheological. Tib lub sijhawm, nws txhim kho kev ua haujlwm ntawm kev tsim kho, ua kom lub sijhawm tsim kho ntev dua, thiab txhim kho qhov zoo ntawm kev kho thiab kev tiv thaiv cov haujlwm. Kev xaiv thiab kev tswj hwm ntawm qhov ntxiv ntawmMHEC yog qhov tseem ceeb rau kev ua tiav kev ua tau zoo ntawm cov cement mortar permeable.