Dab tsi yog Qhov Dej Reducer?

Dab tsi yog Water Reducer?

Ib qho dej reducer yog ib qho kev sib xyaw ua ke uas txo cov dej sib tov uas yuav tsum tau ua thaum tswj xyuas qhov poob ntawm cov pob zeb tseem ceeb tsis hloov. Feem ntau yog anionic surfactants. Thaum ntxiv rau cov pob zeb sib xyaw, nws disperses cov cement hais, txhim kho nws cov kev ua haujlwm, txo cov dej kom muaj nuj nqis, txhim kho qhov sib tov fluidity; los yog txo cov cement kom muaj nuj nqis, txuag cov cement.

Hom Dej Reducers

Los ntawm Kev tshwm sim:

Cov kua (nrog cov ntsiab lus feem ntau ntawm 10%, 20%, 40% hu ua niam cawv, thiab 50%) thiab hmoov (feem ntau yog 98%).

Los ntawm Kev Txo Dej thiab Txhim Kho Kev Muaj Peev Xwm:

Cov dej li qub (tseem hu ua plasticizers, nrog cov dej txo qis tsawg dua 8%, feem ntau lignosulfonates),

High-efficiency dej reducers (tseem hu ua superplasticizers, nrog rau cov dej txo qis qis dua 14%, suav nrog naphthalene, melamine, amino sulfonate, thiab aliphatic series),

Kev ua haujlwm siab dej txo qis (nrog cov dej txo qis qis dua 25%, feem ntau yog polycarboxylate).

Los ntawm Composition Material:

Lignosulfonate, polycyclic aromatic ntsev, dej-soluble resin sulfonates, naphthalene high-efficiency reducers, aliphatic high-efficiency reducers, amino high-efficiency reducers, polycarboxylate high-performance reducers.

Los ntawm Chemical Composition:

Lignosulfonate reducers, naphthalene high-efficiency reducers, melamine high-efficiency reducers, amino sulfonate high-efficiency reducers, fatty acid siab reducers, polycarboxylate high-efficiency reducers.

Kev ua haujlwm ntawm Dej Reducers

Txo kev siv cov cement yam tsis hloov lwm cov khoom siv sib piv (tshwj tsis yog cov cement) thiab tswj cov pob zeb ua kom muaj zog.

Txo kev siv dej tsis tas hloov lwm yam khoom siv (tshwj tsis yog dej) thiab kev poob qis, ua kom muaj zog ntxiv.

Txhim kho cov pob zeb rheology thiab plasticity yam tsis hloov cov khoom sib piv, ua kom muaj kev tsim kho xws li tus kheej ntws, tso dej, thiab tsis muaj kev vibration, ua kom ceev kev tsim kho thiab txo kev siv hluav taws xob.

Muab ob npaug rau lub neej ntawm cov pob zeb, txawm tias txuas ntxiv lub neej kev pabcuam ntawm cov tsev.

Txo cov pob zeb shrinkage thaum teeb tsa, tiv thaiv kev tawg; txhim khu kev tiv thaiv Frost, muaj txiaj ntsig zoo rau kev tsim kho lub caij ntuj no.

Mechanism of Action for Water Reducers

Dispersion

Lubrication

Spatial hindrance

Graft copolymerization thiab ncua kev tso tawm

Cov teeb meem thiab kev daws teeb meem nrog cov dej txo qis

1. Nruas Nruas Phenomenon:

Cement mortar sticks rau cov phab ntsa sib tov, ua rau cov pob zeb tsis sib xws.

Kev daws: Kev tu tsis tu ncua, pib sib tov nrog cov khoom sib xyaw thiab qee cov dej, tom qab ntawd ntxiv cov cement, cov dej seem, thiab cov reducer.

2. Kev teeb tsa tsis raug:

Qhob sai poob fluidity tom qab tso tawm, ua unworkable.

Kev daws: Hloov cov cement hom, kho cov additives rau compatibility, ntxiv Na2SO4 rau qhov sib tov, txo qhov sib tov kub.

3. Tsis-Setting:

Cov pob zeb tseem tsis tau teeb tsa rau lub sijhawm ntev, los ntshav ntog thiab tawg.

Kev daws: Tsis txhob pub ntau tshaj qhov pom zoo los ntawm ntau dua 2-3 zaug; tom qab qhov kawg teeb tsa, ua kom kub kub thiab txhim kho dej kho; tshem tawm thiab rov ua dua ib qho kev teeb tsa.

4. Tsawg zog:

Lub zog qis dua li cov hnub nyoog sib xws los yog cov pob zeb ua ke tab sis muaj zog tsawg heev.

Kev daws: Txhim kho lossis rov ua dua tshiab; txhim khu tom qab ncuav vibration; hais cov laj thawj rau qhov teeb meem.

5. Kev poob nrawm nrawm:

Cov pob zeb sai sai poob kev ua haujlwm, kev poob qis txo qis txhua ob peb feeb.

Kev daws: txheeb xyuas thiab hais txog qhov ua rau; siv ncua ntxiv ntawm reducer thiab rov sib xyaw; tsis txhob ntxiv dej.

6. Kev daws teeb meem tawg:

Luv luv, ncaj, ntiav cov kab nrib pleb tshwm nyob rau hauv pob zeb ua ntej pib teeb tsa.

Kev daws: Ncua thaj tsam ib ncig ntawm cov kab nrib pleb ua ntej thiab tom qab pib qhov chaw kom txog thaum lawv ploj mus.