Concrete admixture yog cov tshuaj lom neeg uas tau ntxiv rau hauv cov txheej txheem ntawm kev sib xyaw ua ke, suav txog tsawg dua 5% ntawm cov cement, thiab tuaj yeem txhim kho kev ua tau zoo ntawm pob zeb.Cov yam ntxwv ntawm cov pob zeb sib xyaw yog ntau ntau yam thiab me me, uas muaj kev cuam tshuam zoo rau kev ua tau zoo ntawm cov pob zeb, thiab muaj cov yam ntxwv ntawm kev nqis peev tsawg, cov txiaj ntsig ceev, thiab cov txiaj ntsig kev lag luam tseem ceeb.Nrog rau kev nce qib ntawm kev tshawb fawb thiab thev naus laus zis tsis tu ncua, cov khoom siv sib xyaw tau siv ntau thiab ntau dua, thiab cov khoom sib xyaw ua ke tau dhau los ua qhov tseem ceeb thib tsib ntawm cov pob zeb ntxiv rau plaub yam tseem ceeb.

Admixtures tuaj yeem txhim kho cov kev ua haujlwm ntawm cov pa roj carbon monoxide ntawm cov pob zeb rau qee yam.Muaj qee qhov kev sib raug zoo ntawm cov carbonation qhov tob thiab porosity ntawm pob zeb.Admixtures muaj kev cuam tshuam zoo rau Frost tsis kam ntawm pob zeb.Nws muaj kev ua tau zoo, tab sis qhov sib ntxiv ntawm cov neeg sawv cev thaum ntxov tsis muaj kev cuam tshuam rau cov dej khov ua haujlwm ntawm cov pob zeb.

Raws li kev ua vaj tse admixtures, nws tuaj yeem muab faib ua cov hauv qab no:
1) Tshuaj admixtures los txhim kho cov khoom rheological ntawm cov pob zeb sib tov.Nrog rau ntau yam dej txo cov neeg ua haujlwm, cov khoom siv cua nkag thiab cov twj tso kua mis, thiab lwm yam.
(2) Tshuaj admixtures uas kho lub sij hawm teem thiab hardening zog ntawm pob zeb.Xws li cov retarders, thaum ntxov zog cov neeg sawv cev thiab accelerators.
(3) Tshuaj admixtures los txhim kho lub durability ntawm pob zeb.Xws li tus neeg saib xyuas huab cua, tshuaj tiv thaiv kab mob, tus neeg saib xyuas dej tsis zoo thiab xeb inhibitor, thiab lwm yam.
(4) Tshuaj admixtures los txhim kho lwm yam khoom ntawm pob zeb.Xws li cov neeg ua haujlwm huab cua nkag, nthuav cov neeg sawv cev, cov xim pleev xim, thiab lwm yam.

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