Vim li cas Cov Pob Tawb Superplasticizer Muaj Qhov Zoo Rau Cov Khoom Siv?

1.1 Dej-txo cov nyhuv:
Thaum cov dej ua kom muaj txiaj ntsig zoo ntxiv rau cov pob zeb, lawv tuaj yeem txo cov dej-rau-cement piv rau qee yam mob. Cov dej-txo tus nqi ntawm high-efficiency dej reducers tuaj yeem ncav cuag 10%-25%, hos cov dej zoo tib yam muaj tus nqi ntawm 5%-15%. Yog vim li cas rau cov nyhuv no yog tias cov dej ua kom muaj txiaj ntsig zoo cuam tshuam cov cement particles hauv kev sib tov. Cov nyhuv dispersion tuaj yeem tshwm sim rau ntau yam, xws li adsorption ntawm admixture ntawm cov khoom siv cement hydration (C3A, C4AF, C3S, C2S), lossis electrostatic repulsion ntawm cov cement hais. Tsis tas li ntawd, cov dej reducers tuaj yeem nyiam cov ions uas ua rau muaj kev cuam tshuam ntxiv thiab tiv thaiv kev sib sau ntawm cov cement, yog li tswj kom muaj dej ruaj khov.

1.2 Plasticizing nyhuv:
Tom qab ntxiv cov dej reducers rau pob zeb, qhov fluidity ntawm cov pob zeb nce ntxiv yam tsis hloov cov dej-cement piv. Cov dej hauv nruab nrab tuaj yeem tswj tau qhov kev poob qis ntawm 10cm, thaum cov dej ua haujlwm siab tuaj yeem ncav cuag qhov poob ntawm 25cm. Cov nyhuv no yog ua tiav los ntawm kev txo cov kev sib txhuam sab hauv hauv kev sib xyaw thiab txhim kho cov plasticity ntawm cov pob zeb tshiab.

1.3 Retarding Effect:
Cov dej reducers tuaj yeem ua kom qeeb qhov pib ntawm qhov sib xyaw ua ke. Cov nyhuv no yog vim qhov adsorption ntawm cov khoom sib xyaw ntawm cov cement hais, uas ua rau cov tshuaj tiv thaiv hydration. Cov kev tshawb fawb tau pom tias ntxiv cov dej reducers tuaj yeem ua rau lub sijhawm induction, ncua lub ncov ntawm cov dej kub, thiab ncua sij hawm teem sijhawm.

1.4 Lubricating nyhuv:
Cov nyhuv lubrication ntawm cov dej reducers feem ntau yog vim lawv cov adsorption ntawm cov cement hais, tsim cov zaj duab xis lubricating uas txo cov kev sib txhuam sab hauv hauv qhov sib tov. Cov yeeb yaj kiab no tuaj yeem txhim kho kev ua haujlwm ntawm cov pob zeb ua haujlwm, ua kom yooj yim rau cov twj thiab qhov chaw.

2. Qhov cuam tshuam ntawm cov dej reducers ntawm cov qauv ntawm cov cement thav duab muab tshuaj txhuam

2.1 Ntxiv Kev Soj Ntsuam ntawm Cement Particles:
Vim tias cov nyhuv dispersion ntawm cov dej reducers, qhov sib cais ntawm cov cement particles nce, ua rau thaj tsam loj dua reactive. Qhov no txhim kho cov tshuaj tiv thaiv hydration thiab tsim cov khoom hydration. Qhov kev sib cais ntau ntxiv kuj tseem ua rau cov txheej txheem hydration, txawm tias tag nrho cov txiaj ntsig ntawm lub sijhawm teeb tsa yuav txawv.

2.2 Tsim ntawm Micro-Crystal:
Thaum lub sij hawm hydration txheej txheem, micro-crystals tsim nyob ib ncig ntawm lub dispersed cement hais. Cov micro-crystals yog thawj zaug zoo heev thiab txuas ntxiv mus, tsim cov qauv ntom ntom thiab sib cuam tshuam. Qhov no txhim kho cov neeg kho tshuab lub zog thiab durability ntawm hardened cement paste.

2.3 Transition Zone Densification:
Qhov sib ntxiv ntawm cov dej reducers densifies txoj kev hloov chaw ntawm cov cement paste thiab aggregates. Qhov no yog vim qhov txo qhov porosity thiab nce ntom ntawm cov khoom hydration hauv cheeb tsam no. Ib qho kev hloov pauv denser txhim kho tag nrho cov qauv kev ntseeg siab thiab ua haujlwm ntev ntawm cov pob zeb.

2.4 Txo Cov Dej Dej:
Thaum cov dej reducers txhim kho qhov pib hydration tshwm sim, lawv tuaj yeem ua rau cov theem dej tom ntej. Cov nyhuv no yog vim kev tsim cov txheej txheej ntom ntom cov khoom siv ntawm cov dej qab zib, uas cuam tshuam ntxiv cov dej nkag mus thiab qeeb qeeb ntawm cov nqi ntawm cov kas fes. Qhov no ua rau muaj kev tswj xyuas ntau dua thiab maj mam nce lub zog ntawm lub sijhawm.

2.5 Txhim kho Durability:
Nyob rau theem tom ntej ntawm hydration, dej reducers pab tsim cov khoom ruaj khov hydration uas txhim kho lub sij hawm ntev ntawm cov pob zeb. Qhov no suav nrog txhim kho kev tiv thaiv tshuaj tua kab mob, txo permeability, thiab txhim kho tag nrho cov qauv kev ncaj ncees.

Los ntawm kev nkag siab txog cov teebmeem no, ib tus tuaj yeem ua kom zoo dua kev siv cov dej ua kom muaj txiaj ntsig zoo kom ua tiav cov khoom xav tau hauv ob qho tib si tshiab thiab tawv tawv, ua kom muaj kev ua haujlwm zoo, lub zog, thiab kav ntev.