Polycarboxylate Superplasticizers yog dab tsi?

PCE yog ib qho kev ua tau zoo, thib peb-tiam dej-txo tus neeg saib xyuas feem ntau siv hauv cov pob zeb sib tov los txhim kho lawv cov kev ua haujlwm thiab lub zog. Nws yog tsim los ntawm polycarboxylate thev naus laus zis, uas muaj cov yam ntxwv zoo tshaj plaws ntawm polymer chemistry tsim los txo cov dej xav tau hauv pob zeb thaum txhim kho nws cov khoom.

Qee qhov tseem ceeb ntawm polycarboxylate superplasticizer suav nrog:
1.Txhim kho cov cuab yeej cuab tam:
Polycarboxylate superplasticizers txhim kho cov neeg kho tshuab lub zog ntawm cov pob zeb, xws li compressive, flexural, thiab tensile lub zog, vim nws cov ntsiab lus dej tsawg uas ua rau kom qhov ntom ntawm cov pob zeb ua qauv.

2.Excellent Plastic Retention:
Steric hindrance tsim los ntawm polymer sab chains ntawm polycarboxylate superplasticizers tiv thaiv kev sib sau ntawm cov cement hais. Qhov no tuaj yeem ua rau muaj qhov sib txawv heev uas tswj kev ua haujlwm tau zoo nyob rau lub sijhawm, txawm tias nyob hauv cov pob zeb uas lwm cov superplasticizers yuav poob lawv cov txiaj ntsig. Qhov no ua rau lub pob zeb ntev dua rau kev ua tiav ua ntej nws pib teeb.

3.Ntau Durability:
Polycarboxylate superplasticizers txhim kho pob zeb ua kom muaj zog los ntawm kev txo cov teeb meem ntawm alkali-aggregate cov tshuaj tiv thaiv thiab txhim kho kev tiv thaiv kom khov-thaw mus. Yog li ntawd, qhov tshwm sim ntawm cov pob zeb sib tov yog ntau resistant rau ib puag ncig raug, li no ntau ruaj.

4. Kev txo dej kom zoo:
Polycarboxylate superplasticizers muaj txiaj ntsig zoo hauv kev txo cov dej, nce mus txog qhov txo qis txawm tias tsawg npaum li cas, feem ntau yog 0.2-0.3% los ntawm huab hwm coj txheeb ze rau cov cement. Hauv kev sib xyaw ua ke muaj zog, ntau dua C50, kev txo dej tuaj yeem ncav cuag li 40%, siab dua piv nrog cov khoom siv yas.

5.Dimensional Stability:
Shrinkage thiab creep ntawm pob zeb yog tsawg dua nyob rau hauv cov ntaub ntawv ntawm cov pob zeb uas muaj polycarboxylate superplasticizers, yog li muab ntau dua dimension stability thiab li no tsawg dua tawg thaum kho thiab teeb.

6. Txhim kho thaum ntxov muaj zog:
Lub polycarboxylate superplasticizer accelerates qhov chaw thiab hardening ntawm pob zeb, li no nce lub zog thaum ntxov. Nws yog ib qho tseem ceeb heev nyob rau hauv cov xwm txheej uas ceev ceev thiab kev loj hlob ntawm lub zog thaum ntxov tseem ceeb heev.

7. Cov ntsiab lus:
Cov txheej txheem siab tshaj plaws, kev ua haujlwm siab polycarboxylate superplasticizers yog qhov ua tau dhau los ntawm kev ua haujlwm ntawm cov ntsiab lus dej txo qis thiab zoo li txhim kho cov khoom siv dag zog, kev ua haujlwm ntev, thiab kev ua haujlwm ntev ntawm cov pob zeb. Qhov no ua rau lawv zoo tshaj rau cov pob zeb ua haujlwm siab, tshwj xeeb tshaj yog nyob rau hauv kev thov cov ntawv thov xws li kev sib xyaw ua haujlwm siab (C50 thiab siab dua), nrog rau lawv lub peev xwm los txhim kho lub zog thaum ntxov, tuav kev ua haujlwm, thiab qhov ruaj khov.