Qhob yog ib tug loj invention ntawm tib neeg. Qhov tshwm sim ntawm pob zeb tau pib muaj kev hloov pauv hauv keeb kwm ntawm tib neeg architecture. Daim ntawv thov ntawm pob zeb admixtures yog ib qho kev txhim kho loj hauv kev tsim khoom ua vaj tse.Qhov tshwm sim ntawm cov pob zeb ua kom muaj zog batching
cov nroj tsuag tau ua rau kev tsim cov khoom vaj tse pob zeb txav mus rau txoj kev ntawm industrialization thiab kev txuag. Qhov no tseem muab cov kev xav tau ntau ntxiv ntawm kev tswj xyuas kev tsim khoom ua vaj tse, ua rau kev txhim kho tag nrho ntawm cov pob zeb zoo hauv xyoo tas los. Nyob rau tib lub sijhawm, vim muaj kev tswj xyuas cov thev naus laus zis qis hauv qee cov pob zeb sib xyaw ua ke, nws tau coj cov kev phom sij zais rau qhov project zoo, thiab txawm tshwm sim. Kev sib tsoo zoo engineering uas tsis tau ntsib hauv ntau dua 20 xyoo tau ua rau poob nyiaj txiag hnyav.
Lub ntsiab yam tseem ceeb uas ua rau incompatibility ntawm admixtures thiab cement:
Kev ua tau zoo ntawm cov pob zeb tsis yog tsuas yog nyob ntawm kev ua haujlwm ntawm cov khoom siv, tab sis kuj yog nyob ntawm kev hloov pauv ntawm cov khoom siv thiab cov khoom sib xyaw ua ke. Admixtures (dej reducers) tsis sib haum nrog cov cement, uas yog, cov khoom sib xyaw ua haujlwm tsis zoo txhim kho kev ua haujlwm ntawm cov cement, qhov poob ntawm cov pob zeb loj dhau los yog cov pob zeb ua kom nrawm dhau, thiab txawm tias cov kab nrib pleb yuav tshwm sim. nyob rau hauv cov tswv cuab pob zeb.
Raws li qhov thib tsib ntawm cov pob zeb, cov khoom sib xyaw ua ke rau ib qho me me, tab sis nws muaj kev cuam tshuam zoo rau kev ua tau zoo ntawm cov pob zeb, uas tuaj yeem txhim kho qhov poob ntawm cov pob zeb thiab kho lub sij hawm coagulation, yog li txhim kho kev ua tau zoo ntawm kev tsim vaj tse lossis txuag nqi. . Cov tshuaj tiv thaiv dej ntawm cov cement yuav tsum tsawg dua 25% ntawm cov dej ntawm cov cement loj, tab sis thaum cov cement ntsib dej, nws yuav tsim cov qauv flocculation los qhwv cov dej hauv nws. Qhov sib ntxiv ntawm cov khoom sib xyaw tuaj yeem coj cov adsorption rau ntawm qhov chaw ntawm cov cement hais, kom lub ntsej muag ntawm cov cement particles muaj tib tus nqi, uas yog sib cais vim cov nyhuv repulsion, yog li tso cov dej qhwv los ntawm cov cement flocculation qauv, yog li. tias dej ntau tuaj yeem koom nrog hauv cov tshuaj tiv thaiv hydration. , txhim kho kev ua si. Qhov loj ntawm qhov adsorption ntawm cov cement particle mus rau admixture thiab qhov poob ntawm cov nyhuv ntawm admixture qhia txog kev hloov pauv ntawm cov khoom siv rau cov cement.
Qhov teeb meem ntawm kev tsis sib haum xeeb ntawm cov khoom sib xyaw thiab cov cement yog ib qho teeb meem uas txhawj xeeb thiab mob taub hau rau tag nrho cov lag luam ua vaj tse. Tom qab qhov teeb meem tshwm sim, nws yog qhov kawg liam rau ntawm cov khoom sib xyaw. Qhov tsis sib haum xeeb ntawm cov khoom sib xyaw thiab cov cement yog tshwm sim los ntawm kev sib xyaw nws tus kheej. Cov yam ntxwv ntawm qhov zoo thiab cov tshuaj muaj pes tsawg leeg, tab sis lub ntsiab yog vim li cas feem ntau muaj feem xyuam rau tej yam xws li cov cement thiab admixtures, seb nws yog cov dej-txo cov neeg sawv cev, nylon-based superplasticizer los yog peb tiam polycarboxylic acid-based superplasticizer yuav tshwm sim.
Post lub sij hawm: Lub Xya hli ntuj-19-2022
