Muaj nuj nqi ntawm pob zeb dej Reducer

1.Dab tsi yog qhov sib xyaw ua ke

Concrete additive yog ib qho admixture ntxiv rau hauv cov txheej txheem ntawm kev sib xyaw ua vaj tse, uas yog tsuas yog los txhim kho cov kev ua tau zoo ntawm cov pob zeb.Los ntawm cov khoom siv ntxiv, feem ntau tsis pub tshaj 5%. Txawm hais tias cov ntsiab lus me me, tab sis tau ua lub luag haujlwm zoo hauv kev txhim kho kev ua haujlwm ntawm pob zeb, Kev txhim kho pob zeb tau dhau los ua ib qho tseem ceeb tsis tau.Additives siv hauv pob zeb tsuas yog xa mus rau ntau hom dej reducer.Qhov dav ntawm cov pob zeb sib xyaw tau zoo heev txhim kho qhov tsis zoo ntawm cov pob zeb., xws li lub zog tsis zoo, muaj zog brittleness thiab hnyav hnyav, thiab txhim kho qhov kev siv ntawm kev tsim vaj tse.

2.Kev ntsuas kev ua tau zoo ntawm cov dej reducer feem ntau siv hauv pob zeb

Tus neeg saib xyuas dej yog qhov tseem ceeb los xyuas kom meej cov pob zeb thiab kev ua haujlwm ntawm lub hauv paus ntawm kev ua kom txo qis ntawm kev siv dej.Los yog txhim kho kev ua haujlwm ntawm cov pob zeb tsis hloov cov dej siv. Dej reducer tuaj yeem txhim kho lub zog thiab deformation peev xwm ntawm pob zeb., nyob rau tib lub sij hawm yog conducive rau kev txhim kho ntawm anti-seepage muaj peev xwm, thiab yuav tsis tsim corrosion ntawm steel reinforcement, yog qhov tsim nyog rau kev kho cov xeb ntawm cov hlau reinforcement.Dej reducer tuaj yeem muab faib ua cov dej zoo tib yam thiab cov dej ua haujlwm siab..

2.1 Common dej reducer

Ordinary water reducer tuaj yeem ua pob zeb ua tiav yam tsawg kawg nkaus 5% dej txo.Rau pob zeb muaj hnub nyoog 3-7 hnub, lub zog compressive ntawm qhob yuav nce los ntawm 10%, thiab lub zog ntawm pob zeb muaj hnub nyoog nyob ib puag ncig 28 hnub tuaj yeem nce ntxiv los ntawm tsawg kawg yog 5%.Cov dej ntau tshaj yog calcium lignosulfonate dej reducer.Calcium lignosulfonate dej reducer belongs rau anionic nto active tus neeg sawv cev.Thaum cov pob zeb sib xyaw hauv, tus nqi yog 0.2-0.3% ntawm cov ntsiab lus cement, thiab dej txo tus nqi yog li 5% -15%., lub pob zeb ua kom muaj zog tuaj yeem nce los ntawm txog 10% rau 15%.

2.2 Edej-txo tus neeg ua haujlwm tau zoo

Kev cuam tshuam ntawm kev ua haujlwm siab dej-txo tus neeg sawv cev ntawm kev ua tau zoo ntawm kev ua vaj tse feem ntau suav nrog cov hauv qab no:

(1) Kev ua tau zoo ntawm cov pob zeb sib xyaw tshiab.Rau cov dej-txo cov nyhuv ntawm high-efficiency dej-txo tus neeg saib xyuas, Qhov loj me me thiab cov qauv tshwj xeeb ntawm cov dej-txo tus neeg saib xyuas yuav tsum tau coj mus rau hauv tus account.Cov nyhuv aeration ntawm cov dej txo tus neeg sawv cev yog cuam tshuam los ntawm qhov nro ntawm nws cov tshuaj aqueous.Nyob rau hauv cov ntsiab lus ntawm lub sijhawm teeb tsa., naphthalene series thiab melamine tuaj yeem ua ntej lub sijhawm teeb tsa ntawm pob zeb, thiab amino sulfonate superplasticizer tuaj yeem ua rau lub sijhawm teem sijhawm.Txawm hais tias tus neeg saib xyuas dej txo qis tsis muaj zog adaptability rau cov cement sib txawv., tab sis los ntawm kev siv cov dej-txo cov neeg ua haujlwm siab, Kev sib cais thiab los ntshav tshwm sim tuaj yeem txo qis.Los ntawm qhov sib ntxiv ntawm cov dej-txo cov neeg ua haujlwm siab.Qhov kev poob ntawm cov pob zeb tuaj yeem txhim kho.Lub sijhawm tawg thiab qib tshwj xeeb yog txiav txim siab los ntawm hom thiab ntau npaum li cas ntawm cov dej reducer siv..

(2) Kev cuam tshuam rau kev ua haujlwm hardening ntawm pob zeb.Lub degree ntawm hydration ntawm cov cement tuaj yeem txhim kho los ntawm kev ntxiv cov dej-txo cov neeg ua haujlwm siab.Qhov compressive thiab flexural lub zog ntawm cov pob zeb tuaj yeem txhim kho tau zoo.Cov dej-txo cov neeg ua haujlwm siab tuaj yeem txo cov cement los ntawm kev hloov cov nqi shrinkage ntawm pob zeb..

(3) Influence rau durability ntawm pob zeb.Kev ua haujlwm siab dej reducer tuaj yeem txhim kho cov Frost thiab thaw tsis kam ntawm cov pob zeb vim nws cov dej txo qis thiab me me ntawm cov cua nkag.Thiab cov dej-txo cov neeg ua haujlwm siab tuaj yeem txhim kho lub peev xwm ntawm cov pob zeb kom tiv thaiv sulfuric acid corrosion.Cov kev sim pom tau hais tias qhov kev tiv thaiv corrosion ntawm sulfuric acid tsis phem dua li ntawm cov pob zeb dawb..

(4) Kev cuam tshuam rau kev tiv thaiv corrosion ntawm steel reinforcement.Qhob ntxiv nrog cov dej-txo cov neeg ua haujlwm siab tuaj yeem sib raug zoo nrog steel tuav, thiab lub zog sib txuas ntawm ncaj zawv zawg steel tuav thiab pob zeb rau 7 hnub tuaj yeem txhim kho los ntawm 1.2mpa mus rau 8.5mpa.Qhov kev sib raug zoo ntawm cov nqaj hlau thiab pob zeb tuaj yeem nce ntxiv los ntawm 15 MPa rau 27.5 MPa nyob rau hauv 7D.Qhov kev sim qhia tau hais tias cov yas reinforced pob zeb nrog cov dej-txo cov neeg ua haujlwm siab tuaj yeem ua rau cov hlau tsis zoo tom qab. 4 xyoo ntawm kev kho static. Yog li ntawd, cov dej-txo cov neeg ua haujlwm siab tuaj yeem tiv thaiv steel bar hauv pob zeb.

3.Dej-txo tus neeg sawv cev yog siv los txhim kho kev ua tau zoo ntawm pob zeb

Dej txo tus neeg sawv cev siv hauv kev sib xyaw ua ke tuaj yeem hloov cov roj cov ntsiab lus ntawm cov pob zeb thiab txo qhov sib txawv ntawm cov pob zeb.Qhov cuam tshuam ntawm cov dej reducer ntawm cov kua dej ntawm cov pob zeb feem ntau cuam tshuam los ntawm tus lej ntawm tus nqi ntawm kev sib tsoo degree.Thaum qhov kev faib ua feem ntawm cov dej thiab cov cement siv hauv cov pob zeb tseem tsis hloov pauv., Lub cev qhuav dej ntawm cov pob zeb tuaj yeem txhim kho tau zoo los ntawm kev ntxiv cov dej txo tus neeg sawv cev.Los ntawm kev siv cov dej reducer, Lub sijhawm teem ntawm pob zeb tuaj yeem txuas ntxiv kom tsim nyog.Tab sis qhov ntau npaum li cas ntawm cov dej reducer yuav tsum tau tswj kom tsim nyog.Ua kom tsim nyog kom tsis txhob muaj kev nce ntau hauv cov pob zeb uas tsis condense rau lub sijhawm ntev.Los ntawm kev ntxiv cov kev faib ua feem ntawm cov dej txo tus neeg sawv cev., qhov kev ua tau zoo thiab lub zog ntawm tag nrho cov pob zeb ua qauv tuaj yeem txhim kho thiab qhov kev faib ua feem ntawm cov dej thiab cov hmoov tshauv hauv cov pob zeb yuav raug txo kom tsawg., dej reducer tuaj yeem tsim nyog ntxiv raws li kev ua kom cov cement cov ntsiab lus thiab kev sib tsoo degree tas li.Tam sim no, dej txo tus neeg sawv cev tuaj yeem tiv thaiv qhov tshwm sim ntawm xeb teeb meem ntawm steel bar hauv pob zeb.Vim tias nws tuaj yeem txo cov carbonization ntawm pob zeb. Yog li ntawd, ntau yam khoom ntawm pob zeb tuaj yeem txhim kho los ntawm kev ntxiv dej reducer rau pob zeb.