Admixtures rau pob zeb

Admixtures rau pob zeb yog cov khoom xyaw tshwj xeeb ntxiv rau cov pob zeb sib xyaw thaum sib xyaw lossis batching los hloov nws cov khoom lossis txhim kho nws cov kev ua tau zoo. Cov khoom sib xyaw no tuaj yeem txhim kho ntau yam ntawm cov pob zeb, suav nrog kev ua haujlwm, lub zog, ua haujlwm ntev, teeb tsa lub sijhawm, thiab ua haujlwm rau cov tshuaj lossis ib puag ncig. Nov yog qee yam hom admixtures rau pob zeb:

1. Dej-txo cov khoom xyaw:

• Cov dej txo qis, tseem hu ua plasticizers lossis superplasticizers, yog siv los txo cov dej uas xav tau hauv cov pob zeb sib tov thaum tswj kev ua haujlwm.
• Lawv txhim kho qhov ntws thiab kev ua haujlwm ntawm pob zeb, ua kom yooj yim rau qhov chaw thiab ua tiav.
• Superplasticizers tuaj yeem muab faib ua qib siab lossis nruab nrab raws li lawv lub peev xwm los txo cov ntsiab lus dej thiab nce slump.

2. Teem Retarding Admixtures:

• Teem retarding admixtures yog siv los ncua lub sijhawm teem sijhawm ntawm kev ua vaj tse, tso cai rau ncua sijhawm ntxiv thiab ua tiav.
• Lawv tau txais txiaj ntsig zoo hauv huab cua kub lossis thaum thauj cov pob zeb hla kev deb.
• Cov khoom sib xyaw no tuaj yeem pab tiv thaiv cov pob qij txha txias thiab txhim kho kev sib raug zoo ntawm cov pob zeb ua tiav.

3. Accelerating Admixtures:

• Accelerating admixtures yog ntxiv rau cov pob zeb kom ceev qhov chaw thiab kev loj hlob thaum ntxov.
• Lawv muaj txiaj ntsig zoo thaum huab cua txias lossis thaum lub sijhawm tsim kho sai yuav tsum tau ua.
• Calcium chloride yog ib qho kev sib xyaw ua kom nrawm, txawm hais tias nws siv yuav ua rau corrosion ntawm steel reinforcement thiab efflorescence.

4. Cua-Entraining Admixtures:

• Cua-entraining admixtures yog siv los ua kom paub cov pa microscopic npuas rau hauv cov pob zeb sib xyaw.
• Cov npuas huab cua no txhim kho qhov ua tau zoo ntawm cov pob zeb los ntawm kev muab kev tiv thaiv kom khov-thaw mus, txo cov ntshav thiab kev sib cais, thiab txhim kho kev ua haujlwm.
• Cua-entraining admixtures feem ntau yog siv nyob rau hauv cov huab cua txias thiab rau cov pob zeb raug rau de-icing ntsev.

5. Retarding thiab Dej-txo Admixtures:

• Cov admixtures no ua ke cov khoom ntawm teeb tsa retarding thiab dej-txo admixtures.
• Lawv ncua sijhawm teem sijhawm ntawm cov pob zeb ua ke thaum tib lub sijhawm txhim kho kev ua haujlwm thiab txo cov ntsiab lus dej.
• Retarding thiab dej-txo admixtures feem ntau yog siv nyob rau hauv cov huab cua kub los tiv thaiv kom ceev ceev thiab poob poob.

6. Corrosion-Inhibiting Admixtures:

• Corrosion-inhibiting admixtures yog ntxiv rau pob zeb los tiv thaiv embedded steel reinforcement los ntawm corrosion.
• Lawv tsim cov txheej txheem tiv thaiv ntawm qhov chaw ntawm lub zog, tiv thaiv kev nkag mus ntawm chlorides thiab lwm yam corrosive agents.
• Cov admixtures no tshwj xeeb tshaj yog muaj txiaj ntsig zoo nyob rau hauv ib puag ncig marine lossis cov qauv raug rau de-icing ntsev.

7. Shrinkage-Reduction Admixtures:

• Shrinkage-txo admixtures yog siv los txo kom qhuav shrinkage thiab tawg hauv pob zeb.
• Lawv ua haujlwm los ntawm kev txo qhov nro ntawm cov dej pore, tso cai rau kom qhuav zoo dua thiab txo qis qis.
• Cov khoom sib xyaw no tau txais txiaj ntsig zoo hauv cov pob zeb loj, cov khoom ua vaj tsev precast, thiab kev ua haujlwm siab ua vaj tse.

Admixtures ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm thiab ua haujlwm ntev ntawm cov pob zeb hauv ntau yam kev siv. Los ntawm kev ua tib zoo xaiv thiab muab cov khoom sib xyaw tsim nyog rau hauv kev sib xyaw ua ke, engineers thiab cov neeg cog lus tuaj yeem ua tiav cov khoom xav tau xws li kev txhim kho kev ua haujlwm, lub zog, durability, thiab kev tiv thaiv ib puag ncig tsis zoo. Nws yog ib qho tseem ceeb kom ua raws li cov neeg tsim khoom pom zoo thiab cov lus qhia ntau npaum li cas thaum siv cov khoom sib xyaw kom ntseeg tau tias kev ua tau zoo thiab kev sib raug zoo nrog cov pob zeb sib xyaw.