Polycarboxylate dej txo (PCE) hauv cov cement mortar

Polycarboxylate dej txo(PCE)yog ib tiam tshiab ntawm cov tshuab txo dej ua haujlwm siab nrog kev siv dav tshaj plaws thiab kev ua tau zoo tshaj plaws hauv cov ntaub ntawv cement niaj hnub no. Nws yog siv dav hauv cov pob zeb sib xyaw ua tiav, cov tshuaj mortar uas nws tus kheej leveling, cov ntaub ntawv grouting, cov tshuaj mortar kho thiab cov pob zeb ua haujlwm siab.

1. Txoj kev ua haujlwm

Polycarboxylate dej reducer yog ib hom high-molecular surfactant uas muaj cov saw hlau polyether thiab cov saw hlau carboxylic acid. Nws cov peev xwm txo dej thiab dispersing feem ntau yog los ntawm ob qho:

1.1. Kev tawm tsam hluav taws xob

Cov saw hlau tseem ceeb ntawm Polycarboxylate dej reducer molecule muaj ntau tus carboxyl pawg (-COOH), uas yog ionized nyob rau hauv ib puag ncig alkaline los tsim carboxylate radicals (-COO⁻), uas yog adsorbed rau ntawm qhov chaw ntawm cov cement me me, ua rau cov khoom me me nqa tib lub nqi tsis zoo, yog li repelling ib leeg thiab txhawb kev tawg ntawm cov cement me me.

1.2. Cov nyhuv cuam tshuam ntawm kev mob steric

Cov saw hlau polyether xws li polyoxyethylene pawg (PEO) tiv thaiv cov cement kom tsis txhob rov sib sau ua ke los ntawm kev cuam tshuam steric, yog li ua kom lub zog ntawm kev sib kis zoo dua. Cov yam ntxwv no zoo dua li cov tshuaj naphthalene thiab aliphatic dej txo qis.

2. Lub luag haujlwm tseem ceeb hauv cov cement mortar

2.1. Txhim kho qhov ua kua dej tau zoo heev

Thaum khaws cov dej-cement piv tsis hloov pauv, PCE tuaj yeem txhim kho qhov fluidity ntawm mortar, ua rau nws yooj yim dua los tsim thiab kis tau sib npaug, tshwj xeeb tshaj yog haum rau tus kheej mortar thiab grouting cov ntaub ntawv.

2.2. Txo kev siv dej ntau heev

PCE tuaj yeem txo cov dej sib tov los ntawm kwv yees li 20% -35% yam tsis cuam tshuam rau qhov fluidity, yog li txhim kho qhov ceev thiab lub zog ntawm cov mortar thiab txhim kho kev ruaj khov.

2.3. Txhim kho kev khaws dej thiab kev ua haujlwm ntawm kev tsim kho

Los ntawm kev sib kis cov cement sib npaug zos, PCE tuaj yeem txo cov dej ntws thiab kev sib cais, ua rau cov mortar ruaj khov dua, uas yog qhov zoo rau kev saib xyuas tom qab thiab kev txhim kho lub zog.

2.4. Txhawb kom muaj kev sib xyaw ua ke ntawm cov cement hydration

Txo qhov kev sib sau ua ke ntawm cov cement me me thiab cia lawv sib cuag tag nrho nrog dej yuav pab kom muaj kev sib npaug ntawm cov tshuaj tiv thaiv hydration thiab kev loj hlob ntawm lub zog thaum ntxov ntawm cov mortar.

2.5. Txhim kho cov khoom siv kho tshuab

Vim nws cov dej txo qis siab thiab cov qauv compact, cov cement mortar sib xyaw nrog PCE muaj zog compressive thiab flexural ntau dua, tshwj xeeb tshaj yog nyob rau hauv cov mortar muaj zog siab.

3. Cov txiaj ntsig ntawm kev ua tau zoo

Kev txo dej ua haujlwm siab: Piv nrog cov tshuaj naphthalene-based thiab lignin-based water reducers, PCE muaj qhov txo dej siab dua thiab kev ua haujlwm ruaj khov dua.

Kev siv tshuaj tsawg thiab kev ua tau zoo: Feem ntau tsuas yog siv li 0.1% -0.3% ntawm cov khoom siv cement, uas tuaj yeem ua tiav cov txiaj ntsig zoo heev rau kev txo cov dej.

Kev sib raug zoo: Nws tuaj yeem sib xyaw nrog ntau yam cement systems thiab admixtures, thiab muaj kev hloov pauv dav.

Kev tiv thaiv ib puag ncig thiab tsis muaj kuab paug: Polycarboxylate dej reducer yog cov khoom ntsuab thiab zoo rau ib puag ncig uas ua tau raws li qhov xav tau ntawm kev txhim kho niaj hnub no hauv kev tsim kho.

4. Kev ua tau zoo hauv kev siv ua haujlwm

4.1. Cov tshuaj nplaum uas ua kom tiaj tus

PCE ua rau cov mortar muaj cov kua dej zoo thiab muaj peev xwm ua kom nws tus kheej sib zog, uas tsim nyog rau kev ua kom av tiaj tus, caulking thiab kho.

4.2. Cov nplaum rau pobzeb, cov nplaum plaster nyias nyias

Txhim kho qhov kev xav ntawm kev tsim kho, txhim kho qhov lo rau cov txheej hauv paus, thiab txo qhov tawg.

4.3. Kho cov khoom siv mortar thiab grouting

Txo qhov sib piv ntawm dej-cement, txhim kho qhov ceev thiab kev ua tau zoo thaum ntxov, tsim nyog rau cov haujlwm uas muaj lub zog siab thiab cov kev xav tau siab.

5. Cov lus qhia rau kev siv

5.1. Kev tswj hwm kev noj tshuaj

Kev siv tshuaj ntau dhau yuav ua rau cov kua nplaum ntau dhau, dej ntws tawm lossis lub sijhawm teeb tsa ntev, uas yuav tsum tau hloov kho raws li qhov kev sim.

5.2. Kev sib xyaw nrog lwm cov khoom sib xyaw

Yuav tsum tau kuaj PCE seb puas sib haum nrog cov tshuaj retarders, cov tshuaj cua nkag, thiab lwm yam kom tsis txhob muaj kev sib cav sib ceg txog kev ua haujlwm.

5.3. Kev cuam tshuam ntawm cov khoom siv raw

Hom cement, cov xuab zeb fineness modulus, kub thiab lwm yam muaj feem cuam tshuam loj heev rau qhov cuam tshuam ntawm PCE, thiab qhov sib tov sib xyaw yuav tsum tau ua kom zoo raws li qhov xwm txheej tiag tiag ntawm qhov chaw.

5.4. Kev khaws cia thiab kev thauj mus los

Cov kua PCE yuav tsum tsis txhob khov, tsis txhob raug tshav ntuj, thiab kaw kom ruaj, feem ntau yuav khaws cia tau 6 lub hlis; cov hmoov yuav tsum tsis txhob ntub dej.

Polycarboxylate dej reducer ua lub luag haujlwm tseem ceeb hauv cov cement mortarnrog nws cov kev ua haujlwm siab ntawm kev txo dej, kev sib kis zoo heev thiab kev khaws cia plasticity. Nrog rau kev txhim kho tas mus li ntawm cov ntaub ntawv tsim kho ntsuab thiab cov mortar ua haujlwm siab, kev tsim qauv thiab kev siv tshuab ntawm PCE kuj tseem raug kho kom zoo tas mus li. Kev siv PCE kom zoo tsis yog tsuas yog txhim kho kev ua haujlwm ntawm mortar xwb, tab sis kuj pab ua tiav ob lub hom phiaj ntawm kev txuag hluav taws xob thiab kev txo qis pa phem thiab kev txhim kho zoo ntawm kev tsim kho.