Air Entrainment: Tau txais qhov zoo tshaj plaws pob zeb zoo

Kev nkag mus rau huab cua yog ib qho tseem ceeb ntawm kev ua tiav qhov zoo ntawm cov pob zeb zoo, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig hnyav lossis hauv cov ntawv thov uas khov-thaw durability yog qhov tseem ceeb. Cua entrained pob zeb muaj me me npuas npuas tawg thoob plaws hauv qhov sib tov, uas txhim kho nws txoj kev tiv thaiv kom khov-thaw mus, txhim kho kev ua haujlwm, thiab txo cov dej permeability. Nov yog yuav ua li cas huab cua nkag mus rau qhov zoo tshaj plaws pob zeb zoo thiab cov kev siv los ua kom tiav nws:

Cov txiaj ntsig ntawm Air Entrainment:

1. Freeze-Thaw Durability: Huab cua nkag mus ua kom muaj zog ntawm cov pob zeb kom khov-thaw los ntawm kev muab qhov chaw rau dej kom nthuav dav thaum nws khov. Qhov no txo ​​qis qhov tshwm sim ntawm kev tawg, tawg, thiab kev puas tsuaj los ntawm kev puas tsuaj los ntawm khov-thaw, tshwj xeeb tshaj yog nyob rau hauv huab cua txias.
2. Kev ua haujlwm tau zoo: Lub xub ntiag ntawm huab cua npuas txhim kho kev ua haujlwm ntawm cov pob zeb ua haujlwm los ntawm kev ua cov roj nplua nyeem, txo cov kev sib txhuam sab hauv, thiab ua kom yooj yim rau kev tso thiab ua tiav. Qhov no tshwj xeeb tshaj yog muaj txiaj ntsig zoo rau cov pob zeb uas yuav tsum tau muab tso rau hauv qhov chaw muaj kev sib tsoo.
3. Durability: Kev nkag mus rau huab cua txhim kho qhov ua tau zoo ntawm cov pob zeb los ntawm kev txo cov permeability ntawm cov dej thiab cov khoom hnyav, xws li chlorides thiab sulfates, yog li txo qhov kev pheej hmoo ntawm corrosion thiab tshuaj tua kab mob ntawm cov hlau reinforcing.
4. Kev Txhim Kho Lub Zog: Thaum tswj tau zoo, huab cua nkag tsis cuam tshuam rau lub zog compressive ntawm pob zeb. Qhov tseeb, nws tuaj yeem txhim kho lub zog thiab ua haujlwm ntev ntawm cov pob zeb hauv lub sijhawm ntev los ntawm kev tiv thaiv nws ntawm kev puas tsuaj thiab kev puas tsuaj.

Methods of Achieving Air Entrainment:

1. Chemical Admixtures: Air-entraining admixtures, xws li hluavtaws surfactants lossis natural wood resins, yog ntxiv rau cov pob zeb sib tov thaum sib tov. Cov admixtures stabilize huab cua npuas hauv cov pob zeb thiab tswj lawv qhov loj me thiab kev faib tawm.
2. Mechanical Agitation: Mechanical method, xws li high-speed mixing or agitation, can be used to incorporate air into the concrete mix. Qhov no feem ntau ua tiav siv cov cuab yeej tshwj xeeb, xws li cua-entraining admixture dispensers lossis paddle mixers.
3. Kev Tsim Nyog Tsim Nyog: Kev xaiv cov khoom tsim nyog thiab kev faib ua feem hauv cov qauv sib xyaw ua ke yog qhov tseem ceeb rau kev ua tiav kev pom huab cua nkag. Cov yam ntxwv xws li hom cement, gradation gradation, dej-cement ratio, thiab admixture ntau npaum li cas yuav tsum tau ua tib zoo txiav txim siab los xyuas kom meej cov huab cua sib xws thiab kev faib tawm.
4. Kev Ntsuas thiab Kev Tswj Xyuas Zoo: Kev ntsuas tsis tu ncua thiab kev tswj xyuas qhov zoo yog tsim nyog los saib xyuas thiab tswj xyuas cov ntsiab lus ntawm huab cua uas xav tau thiab sib xws hauv cov pob zeb sib xyaw. Cov ntsiab lus ntawm huab cua feem ntau yog ntsuas los ntawm kev ntsuas siab los yog cov txheej txheem volumetric, thiab kev hloov kho tau ua raws li qhov xav tau kom ua tiav cov cai.

Xaus:

Kev nkag mus rau huab cua ua lub luag haujlwm tseem ceeb hauv kev ua kom tau txais kev pom zoo ntawm cov pob zeb zoo, tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov uas muaj zog thiab tsis kam mus rau lub voj voog khov-thaw yog qhov tseem ceeb. Los ntawm kev sib xyaw cov cua npuas rau hauv cov pob zeb sib xyaw los ntawm cov khoom siv tshuaj lom neeg, kev sib xyaw ua ke, thiab tsim kev sib xyaw ua ke, engineers thiab cov neeg cog lus tuaj yeem txhim kho kev ua haujlwm, ua haujlwm ntev, thiab kev ua haujlwm ntev ntawm cov pob zeb ua vaj tse nyob rau hauv ntau yam ntawm ib puag ncig. Kev ntsuas tsis tu ncua thiab kev tswj xyuas qhov zoo yog qhov tseem ceeb los xyuas kom meej cov huab cua zoo ib yam thiab zoo hauv kev tsim cov pob zeb.