Hnub Kawg Ua Ntawv Thov: Lub Rau Hli 6, 2022

Thaum xub thawj, cov khoom siv tsuas yog siv los txuag cov cement. Nrog rau txoj kev loj hlob ntawm kev tsim kho technology, admixture tau dhau los ua qhov kev ntsuas tseem ceeb los txhim kho kev ua tau zoo.

Tsaug rau superplasticizers, high-flow pob zeb, nws tus kheej-compacting pob zeb, high-strength pob zeb yog siv; Ua tsaug rau cov thickeners, cov khoom ntawm cov pob zeb hauv qab dej tau txhim kho: ua tsaug rau cov retarders, lub sijhawm teem ntawm cov cement yog ntev, nws muaj peev xwm txo tau qhov poob poob thiab ua kom lub sijhawm ua haujlwm ntev: vim yog cov tshuaj tua kab mob, qhov chaw khov ntawm cov tshuaj. tuaj yeem txo qis, lossis qhov deformation ntawm cov dej khov siv lead ua yuav tsis ua rau kev puas tsuaj. Nws tsuas yog ua tau los ua kev tsim kho nyob rau hauv qhov kub tsis zoo.

Feem ntau, admixtures muaj cov teebmeem hauv qab no hauv kev txhim kho cov khoom ntawm pob zeb:

 1. Nws tuaj yeem txo cov dej siv ntawm cov pob zeb. Los yog ua kom cov fluidity ntawm cov pob zeb tsis tas yuav nce cov dej.

2. Lub sijhawm teeb tsa ntawm pob zeb tuaj yeem hloov kho.

3. Txo los ntshav thiab cais tawm. Txhim kho kev ua haujlwm thiab dej elutriation kuj.

4. Qhov poob poob tuaj yeem txo tau. Ua kom cov twj tso kua mis twj tso kua mis.

5. Lub shrinkage yuav txo tau. Ntxiv ib tus neeg sawv cev bulking kuj tuaj yeem them nyiaj rau shrinkage.

6. ncua qhov pib hydration thaum tshav kub kub ntawm pob zeb. Txo qhov kub ntawm qhov nce ntawm cov pob zeb loj thiab txo qhov tshwm sim ntawm cov kab nrib pleb.

7. Txhim kho lub zog thaum ntxov ntawm pob zeb. Tiv thaiv kom khov hauv qhov kub tsis zoo.

8. Txhim kho lub zog, ua kom Frost tsis kam, impermeability, hnav tsis kam thiab corrosion kuj.

9. Tswj cov tshuaj tiv thaiv alkali-aggregate. Tiv thaiv steel corrosion thiab txo chloride ion diffusion.

10. Ua los ntawm pob zeb nrog lwm yam khoom tshwj xeeb.

11. Txo cov viscosity coefficient ntawm pob zeb, thiab lwm yam.

 Tom qab ntxiv admixtures rau pob zeb, vim muaj ntau yam sib txawv, cov teebmeem kuj txawv, feem ntau yog cov teebmeem ntawm lub cev, xws li adsorption ntawm cov cement particles los ua ib zaj duab xis adsorption, uas hloov lub peev xwm thiab ua kom sib txawv suction los yog repulsion; Ua kom puas cov qauv flocculation, txhim kho kev ruaj ntseg ntawm cov cement diffusion system, thiab txhim kho cov kev mob ntawm cov cement hydration: qee qhov tuaj yeem tsim cov qauv macromolecular thiab hloov lub xeev adsorption ntawm cov cement hais; qee qhov tuaj yeem txo qhov nro thiab lub zog ntawm cov dej, thiab lwm yam: thiab ob peb ncaj qha koom nrog cov tshuaj tiv thaiv thiab tsim cov khoom sib xyaw tshiab nrog cov cement.

Vim tias cov khoom sib xyaw tuaj yeem txhim kho kev ua tau zoo ntawm cov pob zeb, thiab muaj txiaj ntsig zoo rau kev lag luam. Nws tau siv dav hauv ntau lub teb chaws thiab tau dhau los ua cov khoom siv tsis tseem ceeb hauv pob zeb. Tshwj xeeb tshaj yog siv lub siab potency reducers. Cov cement hais tuaj yeem tawg tag nrho, kev siv dej tsawg heev, thiab lub peev xwm cement tau siv tag nrho. Raws li qhov tshwm sim, cov pob zeb cement yog qhov ntom ntom, thiab cov qauv pore thiab microstructure ntawm thaj chaw sib cuam tshuam tau zoo, yog li ntawd lub cev thiab cov khoom siv ntawm cov pob zeb tau raug txhim kho zoo heev, txawm tias nws yog dej impermeability, los yog chloride ion diffusion. , carbonization, thiab sulfate corrosion kuj. . Raws li kev tiv thaiv kev tiv thaiv, hnav tsis kam thiab lwm yam zoo dua li cov pob zeb tsis muaj cov khoom sib xyaw, tsis tsuas yog txhim kho lub zog, txhim kho kev ua haujlwm. Nws kuj tseem tuaj yeem txhim kho qhov durability ntawm pob zeb. Nws tsuas yog ua tau los tsim cov pob zeb ua haujlwm siab nrog kev ua haujlwm siab, siab zog thiab ua haujlwm siab los ntawm kev sib xyaw superplasticizers.