Thaum xub thawj, cov khoom siv tsuas yog siv los txuag cov cement. Nrog rau kev tsim kho tshuab, kev ntxiv cov khoom siv ntxiv tau dhau los ua qhov kev ntsuas loj los txhim kho kev ua tau zoo ntawm cov pob zeb.
Concrete admixtures xa mus rau cov khoom ntxiv los txhim kho thiab tswj kev ua haujlwm ntawm pob zeb. Daim ntawv thov ntawm kev sib xyaw ua ke hauv engineering tau txais kev saib xyuas ntxiv. Qhov sib ntxiv ntawm admixtures plays lub luag haujlwm hauv kev txhim kho kev ua tau zoo ntawm cov pob zeb, tab sis kev xaiv, ntxiv cov txheej txheem, thiab kev hloov pauv ntawm cov khoom sib xyaw yuav cuam tshuam rau lawv txoj kev loj hlob.
Vim muaj cov dej ua haujlwm siab txo cov neeg ua haujlwm, cov pob zeb ua kom muaj dej ntau, cov pob zeb ua kom nws tus kheej, thiab cov pob zeb ua kom muaj zog; Vim lub
muaj cov thickeners, kev ua tau zoo ntawm cov pob zeb hauv qab dej tau raug txhim kho. Vim tias muaj cov retarders, lub sijhawm teem sijhawm ntawm cov cement tau txuas ntxiv, ua rau nws muaj peev xwm txo qis poob thiab ncua sijhawm kev tsim kho. Vim lub xub ntiag ntawm antifreeze, lub freezing point ntawm cov tshuaj tau txo, los yog lub deformation ntawm cov dej khov siv lead ua qauv tsis ua rau Frost puas.
Qhov tsis xws luag hauv pob zeb nws tus kheej:
Kev ua tau zoo ntawm pob zeb yog txiav txim siab los ntawm qhov piv ntawm cov cement, xuab zeb, gravel, thiab dej. Txhawm rau txhim kho qee qhov kev ua tau zoo ntawm pob zeb, qhov kev faib ua feem ntawm cov khoom siv raw tuaj yeem hloov kho. Tab sis qhov no feem ntau ua rau poob ntawm qhov tod tes. Piv txwv li, txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau pob zeb, nws yuav tsum ua kom cov pob zeb ua kom muaj dej ntau ntxiv, cov dej siv tau tuaj yeem nce ntxiv, tab sis qhov no yuav txo tau lub zog ntawm cov pob zeb. Txhawm rau txhim kho lub zog thaum ntxov ntawm cov pob zeb, tus nqi ntawm cov cement tuaj yeem nce ntxiv, tab sis ntxiv rau cov nqi nce ntxiv, nws kuj tseem tuaj yeem ua rau kom qhov shrinkage thiab creep ntawm pob zeb.
Lub luag haujlwm ntawm kev sib xyaw ua ke:
Kev siv cov khoom sib xyaw ua ke tuaj yeem zam qhov tsis xws li hais saum toj no. Nyob rau hauv rooj plaub uas tsis tshua muaj kev cuam tshuam rau lwm yam khoom ntawm pob zeb, kev siv cov pob zeb sib xyaw tuaj yeem txhim kho qee yam kev ua tau zoo ntawm pob zeb.
Piv txwv li, ntev npaum li 0.2% mus rau 0.3% calcium lignosulfonate dej txo tus neeg sawv cev yog ntxiv rau cov pob zeb, qhov poob ntawm cov pob zeb tuaj yeem nce ntau dua ob zaug yam tsis tas yuav nce cov dej; Ntev npaum li 2% mus rau 4% sodium sulfate calcium qab zib (NC) tus neeg sawv cev sib xyaw yog ntxiv rau cov pob zeb, nws tuaj yeem txhim kho lub zog thaum ntxov ntawm cov pob zeb los ntawm 60% mus rau 70% yam tsis muaj cov cement ntau ntxiv, thiab tseem tuaj yeem txhim kho lub zog thaum ntxov ntawm cov pob zeb. lig zog ntawm lub pob zeb. Ntxiv cov tshuaj tiv thaiv cracking tuaj yeem txhim kho qhov tawg tsis kam, impermeability, thiab durability ntawm pob zeb, tag nrho kev txhim kho lub zog mus ntev.
Post lub sij hawm: May-29-2023
