Hnub Kawg: 19 Lub Kaum Ob Hlis, 2022

Superplasticizers tuaj yeem txo cov dej siv rau kev sib xyaw ua vaj tse tsawg kawg yog 10%, lossis nce tus nqi ntws ntawm cov pob zeb. Rau cov pob zeb muaj hnub nyoog 3 hnub, lub zog ntawm 砼C30 tuaj yeem nce los ntawm 69 mpa, thiab cov pob zeb muaj zog ntawm 28 hnub ntawm hnub nyoog yog nce mus rau yam tsawg kawg nkaus 87 mpa. Feem ntau sivsuperplasticizersFeem ntau yog polyalkyl aryl sulfonates thiab melamine dej txo cov neeg ua haujlwm.

Cov teebmeem ntawmsuperplasticizers ntawm kev ua tau zoo ntawm kev ua vaj tse yog cov hauv qab no:

1. Nyob rau hauv cov nqe lus ntawm cov khoom ntawm freshly mixed qhob. Rau cov dej txo cov nyhuv ntawm superplasticizer, qhov loj me me thiab cov qauv tshwj xeeb ntawm cov dej txo tus neeg siv yuav tsum tau txiav txim siab. Cov cua los ntshav ntawm cov dej txo tus neeg sawv cev yog cuam tshuam los ntawm qhov nro ntawm cov tshuaj aqueous. Qhov ntau qhov nro muaj peev xwm txo qis, qhov pom tseeb ntawm cov ntshav los ntshav. Nyob rau hauv cov nqe lus ntawm kev teeb tsa lub sij hawm, naphthalene thiab melamine tuaj yeem ua ntej lub sij hawm coagulation, thiab sulfamate superplasticizer tuaj yeem ua rau lub sijhawm teem sijhawm. Txawm hais tias lub superplasticizer tsis hloov mus rau cov cement sib txawv, kev siv ntawmsuperplasticizers tuaj yeem txo qhov sib cais thiab los ntshav tshwm sim. Qhov kev poob ntawm cov pob zeb tuaj yeem txhim kho los ntawm kev sib ntxiv ntawm superplasticizer. Lub sijhawm slumping tshwj xeeb thiab qhov tshwj xeeb yog txiav txim siab los ntawm qhov tsis xws li hom thiab tus nqi ntawm cov dej txo tus neeg sawv cev siv.

2. Cov nyhuv ntawm hardening zog ntawm pob zeb. Cement incorporating ib superplasticizer tuaj yeem txhim kho qib ntawm hydration. Lub pob zeb compression thiab dabtsi yog khoov lub zog yog txhim kho.Superplasticizers kuj txo tus nqi ntawm cov cement los ntawm kev hloov cov nqi shrinkage ntawm cov pob zeb. Txawm li cas los xij, qhov kev hloov pauv ntawm tus nqi telescopic feem ntau tsis tshaj tus nqi tus qauv ntawm 1X10-4.

3. Qhov cuam tshuam rau lub kav ntev ntawm pob zeb. High-efficiency dej txo tus neeg sawv cev zoo

txhim kho cov khoom tiv thaiv khov thiab tiv thaiv thaw ntawm cov pob zeb vim qhov txo cov dej siab thiab cov kab mob ntawm cov pa los ntshav. Thiab high-efficiency dej reducer tuaj yeem txhim kho lub peev xwm ntawm pob zeb los tiv thaiv sulfuric acid corrosion. Cov kev sim tau pom tias qhov kev tiv thaiv rau sulfuric acid corrosion ntawm superplasticizer tsis phem dua li ntawm cov pob zeb dawb.

4. Cov nyhuv tiv thaiv corrosion ntawm steel tuav. Qhob nrog cov dej ua kom muaj txiaj ntsig zoo tuaj yeem ua haujlwm zoo nrog cov hlau tuav, thiab cov adhesion ntawm ncaj-slide steel rau pob zeb 7D tuaj yeem txhim kho los ntawm 1.2MPA txog 8.5MPA. Lub adhesion ntawm cov hlau khoov rau cov pob zeb 7D tuaj yeem nce los ntawm 15MPA txog 27.5MPA. Lub superplasticizer tseem tuaj yeem tiv thaiv cov hlau hauv cov pob zeb zoo.