Qhov sib txawv ntawm Additives thiab Admixtures

Qhov txawv tseem ceeb – Additives vs Admixtures

Additives thiab admixtures yog cov khoom siv tshuaj uas ntxiv rau lwm cov ntaub ntawv los txhim kho lawv cov khoom siv tshuaj thiab lub cev. Txawm hais tias ob qho tib si yog cov khoom siv ntxiv rau lwm cov ntaub ntawv, muaj qhov sib txawv ntawm cov additives thiab admixtures thaum nws los txog rau cement thiab pob zeb sib tov. Cov khoom ntxiv tuaj yeem yog cov khoom noj khoom haus lossis lwm yam khoom ntxiv rau qee yam me me los txhim kho lossis khaws cia. Admixtures, ntawm qhov tod tes, yog cov khoom siv ntxiv rau kev sib xyaw ua ke thaum sib tov. Qhov sib txawv tseem ceeb ntawm cov additives thiab admixtures yog cov additives ntxiv rau cov cement thaum lub sij hawm tsim khoom kom tau txais cov khoom tshiab rau cov cement whereas admixtures ntxiv rau cov pob zeb sib tov thaum sib tov kom tau txais cov khoom tshiab.

Dab tsi yog Additives

Cov khoom siv ntxiv yog cov khoom siv tshuaj ntxiv rau cov cement thaum tsim khoom kom tau txais cov khoom tshiab rau cov cement. Cov khoom siv raw siv hauv kev tsim cov cement yog txiv qaub, silica, alumina thiab hlau oxide. Cov khoom no yog hauv av rau hauv cov hmoov zoo thiab sib tov ua ke los ntawm roasting. Cov cua kub ntawm qhov sib tov no mus txog 1500oC yuav pib ntau cov tshuaj tiv thaiv uas muab cov tshuaj lom neeg kawg ntawm cov cement.

Txhawm rau kom tau txais cov khoom xav tau, ntau yam khoom ntxiv tau ntxiv rau cov cement thaum tsim khoom.

Accelerators
Accelerators tau ntxiv los txo cov cement nyob rau lub sijhawm thiab ua kom lub zog ntawm compressive zog.

Retarders
Retarders ncua lub sij hawm cement. Qhov no pab cov cement kom muaj sijhawm txaus rau slurry tso rau hauv qhov dej tob.

Dispersants
Dispersants tau ntxiv los txo cov viscosity ntawm cov cement slurry thiab kom ntseeg tau tias cov av nkos zoo thaum muab tso rau.

Fluid Poob Control Agents
Cov kua dej poob tswj cov neeg ua haujlwm tswj cov dej poob ntawm cov cement rau hauv kev tsim.

Qee cov accelerators ntxiv rau cov cement yog calcium chloride (CaCl2), sodium chloride (NaCl), dej hiav txwv thiab potassium chloride (KCl).

Dab tsi yog Admixtures
Admixtures yog cov khoom siv tshuaj uas ntxiv rau cov khoom sib xyaw ua ke thaum sib xyaw kom tau txais cov khoom tshiab. Admixtures yog cov khoom hauv pob zeb uas tsis yog cement, dej thiab aggregates. Admixtures yog ntxiv rau cov cement tam sim ua ntej lossis thaum lub sij hawm sib xyaw cov pob zeb sib xyaw.

Admixtures yog ntxiv rau:

-Intentionally entrain huab cua
- Txo qhov xav tau dej
- Txhim kho kev ua haujlwm
- Kho lub sij hawm daws teeb meem
- Kho lub zog

Muaj ntau hom admixtures cais raws li hauv qab no nrog qee qhov piv txwv.

Cua entraining admixtures - ntsev ntawm ntoo resins, ib co hluavtaws detergents, ntsev ntawm petroleum acids
Plasticizers
Cov dej-txo cov khoom xyaw - lignosulfonates, hydroxylated carboxylic acids, thiab lwm yam.
Accelerating admixtures - calcium chloride, sodium thiocyanate, thiab lwm yam.
Retarding admixtures - lignin, borax, suab thaj, thiab lwm yam.
Corrosion inhibitors, thiab lwm yam.

Qhov sib txawv ntawm Additives thiab Admixtures

Txhais
Additives: Cov khoom siv ntxiv yog cov khoom siv tshuaj ntxiv rau cov cement thaum tsim khoom kom tau txais cov khoom tshiab rau cov cement.

Admixtures: Admixtures yog cov khoom siv tshuaj uas tau ntxiv rau cov khoom sib xyaw ua ke thaum sib xyaw kom tau txais cov khoom tshiab.

Raw Khoom
Additives: Cov khoom ntxiv yog ntxiv rau cov cement.

Admixtures: Admixtures yog ntxiv rau pob zeb.

Ntxiv
Additives: Cov khoom ntxiv yog ntxiv rau cov cement thaum tsim khoom.

Admixtures: Admixtures yog ntxiv rau pob zeb ua ntej lossis thaum sib tov.

Hom sib txawv
Additives: Txawv additives yog cais raws li accelerators, retarders, dispersants, kua poob tswj tus neeg saib xyuas, thiab lwm yam.

Admixtures: Sib txawv admixtures yog cais raws li huab cua tuav admixtures, plasticizers, dej-txo admixtures, thiab lwm yam.

Xaus
Cov khoom siv ntxiv yog ntxiv rau cov cement thaum tsim khoom. Admixtures yog ntxiv rau cov pob zeb sib tov ua ntej lossis thaum sib tov. Qhov sib txawv tseem ceeb ntawm cov additives thiab admixtures yog cov additives ntxiv rau cov cement thaum lub sij hawm tsim khoom kom tau txais cov khoom tshiab rau cov cement whereas admixtures ntxiv rau cov pob zeb sib tov thaum sib tov kom tau txais cov khoom tshiab.