Cov tshuaj txo cov dej yog feem ntau siv hauv cov tsev

Dej ReducersFeem ntau suav nrog lignin-raws li series, naphthalene series, resin series, molasses series, thiab polycarboxylates, uas tuaj yeem raug cais ntxiv rau hauv huab cua-entraining thiab non-air-entraining hom. Raws li lawv cov teebmeem ntawm agglomeration thiab teeb tsa ceev ntawm cov pob zeb, lawv tuaj yeem muab faib ua peb hom: zoo tib yam, thaum ntxov-lub zog, thiab rov qab.

Lignosulfonate Concrete Admixtures

Lub ntsiab ntau yam ntawm lignin water reducers yog sodium lignosulfonate, uas yog xim av-daj hmoov tau los ntawm khib nyiab ntoo pulp los ntawm cawv extraction, ua raws li evaporation, sulfonation, concentration, thiab tshuaj tsuag kom qhuav. Tsis tas li ntawd, calcium lignosulfonate water reducers kuj muaj. Cov tshuaj pom zoo yog 0.2% rau 0.3%, nrog rau cov dej txo qis ntawm kwv yees li 10%. Yog tias dej tsis txo qis, qhov kev poob qis tuaj yeem txhim kho tau li ntawm 10 cm, thiab 28-hnub compressive lub zog ntawm pob zeb tuaj yeem nce 10% mus rau 20%. Yog tias lub zog tseem tsis tau hloov pauv, kev txuag cement ntawm 10% tuaj yeem ua tiav. Txawm li cas los xij, lignosulfonates (ob leeg sodium thiab calcium) muaj qhov cuam tshuam tsis zoo ntawm cov pob zeb, feem ntau ncua sij hawm los ntawm 1 mus rau 3 teev, nrog rau cov txiaj ntsig zoo ntawm qhov kub qis. Lignosulfonate-raws li admixtures yog huab cua-entraining dej reducers, nce cov huab cua hauv cov pob zeb los ntawm 2% ua ntej sib tov rau 3.6%. Qhov no muaj kev cuam tshuam rau lub zog pob zeb tab sis muaj txiaj ntsig zoo rau cov pob zeb khov-thaw tsis kam.

Naphthalene-based High-Efficiency Water Reducer

Naphthalene-raws li high-efficiency dej reducers yog muab los ntawm naphthalene thiab nws homologues tau los ntawm distillation ntawm thee tar. Lawv yog synthesized los ntawm sulfonation thiab condensation. Poly-naphthalene sulfonates muaj zog dispersing nyhuv ntawm cov cement, ua rau lawv zoo dua hauv kev txo cov dej, txhim kho, thiab kav ntev piv rau lignosulfonates. Cov dej-txo tus nqi yog ntau dua 15%, nrog rau kev txhim kho tseem ceeb ntawm lub zog thaum ntxov thiab 28-hnub compressive zog nce ntau dua 20%. Qhov pom zoo npaum li cas yog kwv yees li 0.5% mus rau 1.5%, nrog tus nqi pH ntawm 7 mus rau 9. Hom dej reducer no haum rau txhua daim ntawv thov pob zeb, tshwj xeeb tshaj yog rau kev ua kom muaj zog thiab nws tus kheej compacting.

Polycarboxylate Superplasticizer (PCE)

Polycarboxylate ether (PCE) muaj qhov tshwj xeeb zoo li cov qauv molecular uas txhawb nqa kev tawg ntawm cov cement hais los ntawm cov teebmeem electrostatic thiab steric. Qhov no txhim kho kev ua haujlwm ntawm cov pob zeb sib xyaw ua ke, txo qis kev siv dej, thiab txhim kho ntau yam khoom ntawm lub cev ntawm pob zeb, suav nrog lub zog compressive, tensile zog, flexural zog, thiab modulus ntawm elasticity. Tetrachloroethylene-based high-efficiency dej reducers tuaj yeem txhim kho qhov khov-thaw tsis kam thiab impermeability ntawm pob zeb. Lawv kuj tau kho lub sijhawm teem ntawm pob zeb, txhim kho nws cov haujlwm ua haujlwm thaum tsim kho. Tsis tas li ntawd, lawv txo cov ntshav, txhim kho qhov ntom ntawm cov pob zeb, thiab ua kom nws cov kav ntev. Cov koob tshuaj zoo yog 0.1% rau 0.2%. Polycarboxylate superplasticizers muaj zog dispersibility, tsawg npaum li cas, poob poob qis, thiab zoo sib xws nrog ntau hom cement, tsis ua rau muaj kev cuam tshuam loj.