Kev tiv thaiv tawg ntawm cov pob zeb ua vaj tse yog qhov tseem ceeb heev rau lub neej ua haujlwm ntawm cov pob zeb ua vaj tse ntsej muag pob zeb (CFRD). Cov teebmeem ntawm cov tshauv ya, Tus neeg sawv cev MgO nthuav dav, thiab cov tshuaj sib xyaw ua kom txo qhov ntsws (SRA) ntawm cov khoom siv kho tshuab, kev ziab kom qhuav thiab kev tiv thaiv tawg ntawm cov pob zeb ntsej muag tau kawm thiab piv nrog cov pob zeb siv piv txwv. Cov txiaj ntsig qhia tau tias qhov ntxiv ntawm 20% cov tshauv ya (los ntawm qhov hnyav ntawm cov ntawv khi) ua rau lub zog ntawm cov pob zeb thaum lub hnub nyoog lig. Hauv kev sib piv, qhov ntxiv ntawm 6% MgO nthuav dav tus neeg sawv cev lossis 1% SRA txo qhov zog compressive, kev sib cais tensile lub zog thiab qhov kawg tensile rau qee qib ntawm ntau lub hnub nyoog. Kev koom ua ke ntawm 20% cov tshauv ya, 6% MgO nthuav dav tus neeg sawv cev, thiab 1% SRA tuaj yeem txo qhov qhuav ntsws ntawm ntau lub hnub nyoog thiab txhim kho qhov tsis kam tawg thaum ntxov ntawm cov pob zeb, thaum kev koom ua ke ntawm 6% MgO nthuav dav tus neeg sawv cev yog qhov zoo dua rau kev txwv tsis pub txoj kev loj hlob ntawm kev ntsws thiab txhim kho qhov tsis kam tawg ntawm cov pob zeb dua li qhov ntxiv ntawm 20% cov tshauv ya lossis 1% SRA.
Lub pas dej ua los ntawm pob zeb ua lub hauv paus (CFRD) yog lub pas dej ua los ntawm pob zeb uas muaj pob zeb ua lub zog tseem ceeb thiab lub ntsej muag pob zeb sab saud ua lub cev tseem ceeb tiv thaiv kev ntws dej. Vim nws muaj kev nyab xeeb zoo, yooj yim hloov kho, lub sijhawm tsim kho luv luv thiab tus nqi qis, cov pas dej ua los ntawm pob zeb ua lub hauv paus tau dhau los ua ib hom pas dej uas siv dav tshaj plaws hauv kev tsim pas dej. Cov pob zeb ua lub hauv paus yog cov qauv nyias thiab zoo li daim kab xev uas yooj yim tawg vim qhov kub hloov pauv, kev hloov pauv ntawm qhov ntim thiab kev sib tsoo ntawm lub hauv paus pas dej. Rau lub cev pas dej, yog tias muaj qhov tawg ntawm lub ntsej muag pob zeb, nws yuav ua rau puas tsuaj thiab ua kom lub cev pas dej ruaj khov, thiab qhov sib txawv los ntawm qhov tawg ntawm lub ntsej muag yuav ua rau cov dej sab nraud nkag mus rau hauv cov pob zeb, uas ua rau lub cev pas dej xau ncaj qha. Yog li ntawd, kev txhim kho qhov tsis kam ntawm cov pob zeb ua lub ntsej muag yog qhov teeb meem tseem ceeb ntsig txog kev ua haujlwm zoo ntawm cov pas dej ua los ntawm pob zeb ua lub ntsej muag pob zeb. Cov kev xyaum ua haujlwm thiab kev tshawb fawb tam sim no qhia tau hais tias cov kev ntsuas tseem ceeb los txhim kho qhov tawg ntawm cov pob zeb ntsej muag suav nrog kev tswj hwm qhov zoo ntawm cov khoom siv raw pob zeb, ua kom zoo dua qhov sib piv ntawm cov pob zeb sib xyaw, ntxiv cov tshauv ya thiab ntxiv cov fibers kom tsim nyog. Cov khoom tseem ceeb ntawm cov khoom siv txo qhov ntsws yog ib hom polyalcohol lossis polyether organic compounds thiab lawv cov derivatives. Cov kev tshawb fawb tau qhia tias kev ntxiv cov neeg sawv cev txo qhov ntsws tuaj yeem txo qhov nro ntawm cov dej hauv qhov pob zeb, yog li txo qhov kev ntxhov siab ntsws tsim thaum cov qhov capillary poob dej, thiab txhim kho qhov tawg tsis kam ntawm cov pob zeb mus rau qee qhov. Kev ntxiv MgO expansion agent thaum lub sijhawm npaj pob zeb yog ib txoj hauv kev siv los tswj cov kab nrib pleb. Txij li thaum MgO expansion agent yuav tsim qee qhov ntim nthuav dav thaum lub sijhawm teeb tsa pob zeb thiab cov txheej txheem hardening, nws tuaj yeem them rau qhov tawg ntawm cov pob zeb, suav nrog qhov kub thiab txias, qhuav shrinkage thiab tus kheej shrinkage, yog li txo qhov tshwm sim ntawm cov pob zeb tawg. Tam sim no, MgO expansion agent tau ua tiav siv rau cov pob zeb loj ntawm chaw nres tsheb hydropower thiab tau txais txiaj ntsig zoo tiv thaiv kev tawg. Txawm li cas los xij, muaj ob peb txoj kev tshawb fawb txog cov nyhuv ntawm shrinkage reducer thiab MgO expansion agent ntawm qhov tawg tsis kam ntawm cov pob zeb ntsej muag.
Lub sijhawm tshaj tawm: Lub Peb Hlis-09-2022