5. Teeb meem nrog kev noj tshuaj ntawm polycarboxylate dej-txo tus neeg sawv cev

Qhov ntau npaum ntawm polycarboxylate dej-txo tus neeg saib xyuas yog tsawg, tus nqi txo cov dej yog siab, thiab cov slump yog khaws cia zoo, tab sis cov teeb meem hauv qab no kuj tshwm sim hauv daim ntawv thov:

① Qhov ntau npaum yog rhiab heev thaum qhov sib piv ntawm cov dej-rau-cement me me, thiab qhia tau hais tias cov dej txo qis dua. Txawm li cas los xij, thaum qhov sib piv ntawm cov dej-rau-cement loj (saum toj no 0.4), cov dej txo qis thiab nws cov kev hloov pauv tsis pom tseeb, uas tej zaum yuav cuam tshuam nrog polycarboxylic acid. Cov txheej txheem ntawm kev txiav txim ntawm cov kua qaub-raws li dej txo tus neeg sawv cev muaj feem xyuam rau nws cov dispersion thiab tuav cov nyhuv vim cov steric hindrance nyhuv tsim los ntawm cov qauv molecular. Thaum qhov sib piv ntawm cov dej-binder loj, muaj qhov sib nrug txaus ntawm cov dej molecules hauv cov cement dispersion system, yog li qhov chaw ntawm polycarboxylic acid molecules Cov nyhuv steric hindrance yog ib txwm me dua.

② Thaum cov khoom siv cementitious loj, qhov cuam tshuam ntawm qhov ntau npaum yog pom tseeb dua. Raws li cov xwm txheej zoo ib yam, cov dej txo qis thaum tag nrho cov khoom siv cementitious yog <300kg / m3 me dua li cov dej txo qis thaum tag nrho cov khoom cementitious yog> 400kg / m3. Ntxiv mus, thaum cov dej-cement ratio loj thiab cov khoom siv cementitious me me, yuav muaj cov nyhuv superimposed.

Polycarboxylate superplasticizer yog tsim los rau cov pob zeb ua haujlwm siab, yog li nws cov kev ua tau zoo thiab tus nqi tsim nyog rau cov pob zeb ua haujlwm siab.

6. Hais txog kev sib xyaw ntawm polycarboxylic acid dej-txo cov neeg ua haujlwm

Polycarboxylate dej-txo cov neeg ua haujlwm tsis tuaj yeem sib xyaw nrog naphthalene-raws li dej-txo cov neeg ua haujlwm. Yog tias ob qhov dej-txo cov neeg ua haujlwm tau siv rau hauv cov khoom siv tib yam, lawv kuj yuav muaj kev cuam tshuam yog tias lawv tsis huv. Yog li ntawd, nws yog feem ntau yuav tsum tau siv cov khoom sib cais rau polycarboxylic acid-raws li dej txo cov neeg ua haujlwm.

Raws li kev siv tam sim no, qhov sib xyaw ua ke ntawm huab cua-entraining tus neeg sawv cev thiab polycarboxylate yog qhov zoo. Qhov laj thawj tseem ceeb yog vim li cas tus neeg saib xyuas huab cua tsis tshua muaj, thiab nws tuaj yeem "tshaj" nrog polycarboxylic acid-raws li dej-txo tus neeg saib xyuas kom ua tau zoo ntxiv. , complementary. Sodium gluconate nyob rau hauv lub retarder kuj muaj zoo compatibility, tab sis muaj tsis zoo compatibility nrog rau lwm yam inorganic ntsev additives thiab nyuaj rau compound.

7. Hais txog tus nqi PH ntawm polycarboxylic acid dej-txo tus neeg sawv cev

Tus nqi pH ntawm polycarboxylic acid-raws li dej-txo cov neeg ua haujlwm yog qis dua li lwm cov dej-txo cov neeg ua haujlwm siab, qee qhov tsuas yog 6-7. Yog li ntawd, lawv yuav tsum tau muab khaws cia rau hauv fiberglass, yas thiab lwm yam ntim, thiab tsis tuaj yeem khaws cia rau hauv cov thawv hlau ntev. Nws yuav ua rau polycarboxylate dej-txo tus neeg saib xyuas kom tsis zoo, thiab tom qab lub sij hawm ntev acid corrosion, nws yuav cuam tshuam rau lub neej ntawm lub thawv hlau thiab kev nyab xeeb ntawm kev cia thiab kev thauj mus los.