Cawv Cawv Hauv Kev Nqes Plag Tawm Thiab Cov Yooj Yim Rau Ntawm Kev Nquag Ua Ntej Ntawm Pob Zeb Ua Si - Xov Xwm

Txij li thaum qhov tshwm sim ntawm superplasticizer nyob rau xyoo 1930s, lub tshuab superplasticizer tau tsim kho sai thiab dav siv, thiab tau dhau los ua qhov tsis tseem ceeb thib tsib hauv pob zeb ua, thiab tau siv dav hauv pob zeb ua ntau lawm. Vim tias qhov ntsuas ntsuas ntawm pob zeb ua kev siv hauv cov tswv yim tsuas yog lub zog thiab pob zeb ntawm pob zeb, tshwj tsis yog muaj qhov yuav tsum ua rau qhov tsis txaus ntseeg thiab lwm qhov ntsuas nyob hauv cov chaw tshwj xeeb, txoj kev txhim kho ntawm cov pob zeb ua feem ntau yog vim kev txhim kho tas mus li ntawm cov pob zeb ua kom muaj zog thiab qib qis. Cov. Cov txheej txheem, thaum tsis quav ntsej cov kev ruaj ntseg ntawm cov pob zeb qhob, tseem ua rau cov khoom tsim thiab siv cov superplasticizer tsuas tsom rau cov dej txo tus nqi. Qhov ncaj qha ncaj qha ntawm kev ua haujlwm tsis zoo rau lub cev yog qhov pib tawg. Tshwj xeeb, kev ua kom ntxov thiab tawg ntawm cov pob zeb tau ua tib zoo mloog ntawm cov kws tshaj lij thiab cov kws tshawb fawb thoob plaws ntiaj teb. Cov kab nrib pleb muaj cim xeeb. Yog tias lub ntsej muag thaum pib ua haujlwm ntawm pob zeb tsis raug kho lossis kho tsis raug, qhov tsis zoo ntawm cov pob zeb yuav ua kom nrawm, uas yuav tsis tsuas cuam tshuam rau lub ntsej muag thiab kev ua haujlwm ntawm lub tsev, tab sis kuj ua rau kev teeb tsa kev nyab xeeb thiab ua tau ntev.

Nrog qhov nce ntawm pob zeb pob zeb qis, qhov tawg tshwm sim lub sijhawm ntawm pob zeb yog feem ntau ncua. Thaum qhov tawg ntawm cov pob zeb ua pob zeb nrog pob zeb pob hauv pob zeb 6 cm tau qeeb los ntawm kwv yees li 2 h, pob zeb ua kom tsis muaj dej ntau lub cev yog ncua ntev li 2 teev. Nws yog superplasticizer uas tuaj yeem nce qhov kev tawg ntawm cov cement agglomerates, hloov qhov sib piv ntawm cov dej adsorbed thiab cov dej dawb, nce cov dej dawb, thiab nce tus nqi ntawm cov dej dawb uas tuaj yeem nqus tau, txawm hais tias qhov ntxiv ntawm superplasticizer yuav nce thaum ntxov dej evaporation ntawm pob zeb. Txawm li cas los xij, qhov nce ntawm qhov tsis zoo ntawm lub qhov pore sib txawv tuaj yeem txo, uas yog, cov dej dawb tso tawm ntau ntau dua li qhov nce ntawm cov nqi ntawm dej evaporation. Tib lub sijhawm, vim hais tias cov superplasticizer adsorbed ntawm cov nplais pob zeb, qhov tshuaj tiv thaiv ntawm cov cement thiab dej raug cuam tshuam, thiab kev tsim khoom ntawm cov kua dej tshiab tau raug muab ncua, thiab thaum pib ua dej tau pib qeeb. Lub sijhawm ntsuas av pib qeeb, thiab lub sijhawm tawg ntawm lub pob zeb ci yog ze rau lub sijhawm teeb tsa ua ntej kom lub sijhawm tawg tau rov qab.

Cawv Cawv Hauv Kev Soj Ntsuam Ntawm Plawv Thiab Thooj Qaum Rau Ntawm Kev Ua Ntej Pob Zeb Ua Ntej Thaum Ntxov