Tswj kev ntsuas ntshav tom qab siv superplasticizer

Kev siv ntawm polycarboxylate superplasticizer pob zeb, piv rau kev siv cov tsoos naphthalene series, aliphatic superplasticizer pob zeb, feem ntau los ntshav yuav qis dua, cov ntshav tsawg yuav loj dua. Tab sis ib zaug siv cov carboxylic acid pob zeb ntau dhau los ntshav, feem ntau nyuaj kho.

1.Molecular mechanism tsim ntawm polycarboxylate superplasticizer

Polycarboxylate superplasticizer tuaj yeem txo los ntshav hauv ntau txoj kev. Ua ntej, polycarboxylate superplasticizer txo cov dej noj ntawm qhov chaw ntawm kev lav qhov kev ua haujlwm ntawm cov khoom siv cement.. Thaum cov dej siv ntawm cov khoom sib tov txo, cov dej los ntshav yuav raug txo kom tsawg. Thib ob, polycarboxylate dej-txo tus neeg saib xyuas muaj cov nyhuv zoo heev, uas tuaj yeem cuam tshuam cov cement particles mus rau hauv dej kom tiv thaiv cov sedimentation ntawm cov khoom loj, thiaj li txo cov ntshav. Thib peb, polycarboxylate molecules tau adsorbed rau saum npoo ntawm cov cement hais, ua cement particles repel ib leeg, txo qhov zoo cement particle loj ntawm flocculation hauv ib pawg, ncua lub sedimentation tus nqi thiab txo cov ntshav los ntshav. Lwm qhov kom zoo dua yog tias cov polycarboxylate superplasticizer molecules yog customizable heev. Me me molecular hnyav, dispersion yuav nce, los ntshav txo me ntsis, tab sis nyob rau tib lub sij hawm coj qhob liquidity poob yuav tsum tau txiav txim siab. Zoo ib yam li cov nyhuv ntawm qhov hnyav molecular ntawm los ntshav, cov ntsiab lus ntawm lub ntsiab saw adsorption pawg hauv polycarboxylate molecules, qhov ntom ntawm graft saw, ntev ntawm ceg saw thiab lwm yam muaj feem xyuam rau cov pob zeb los ntshav.

2 Polycarboxylate superplasticizer ntxiv excipients

Ntxiv cov khoom siv hauv polycarboxylate superplasticizer, xws li cua txias, defoamer, coagulant txhawb nqa, rov qab, viscosity regulator, lwm., tuaj yeem txhim kho pob zeb los ntshav.

Huab cua nkag tuaj yeem txo qhov nro ntawm dej thiab qhia cov npuas me me. Vim qhov sib txawv polarity ntawm tus nqi zoo li qub, Cov npuas me me no yuav adsorb rau saum npoo ntawm cov cement, thiab qhov nruab nrab ntom ntom ntawm cov cement particles adsorbing npuas yuav txo, uas yuav txo cov sedimentation ceev thiab yog li txo los ntshav. Antifoaming cov neeg ua haujlwm muaj cov txheej txheem zoo sib xws tab sis cov nyhuv rov qab. Coagulant tuaj yeem txo lub sijhawm coagulation, yog li cov khoom particle deposition lub sij hawm yuav luv luv, cov ntshav saum npoo yuav raug txo. Hloov pauv, retarders nce los ntshav vim lawv ncua sij hawm nws yuav siv sij hawm rau cov dej kom nce mus rau saum npoo ntawm cov freshly mix slurry. Viscosity regulator yog siv los txhim kho cov viscosity ntawm cov dej sib tov, thiab tom qab ntawd kho tus nqi sedimentation ntawm cov khoom siv, kom ua tiav cov kev cai los ntshav.

3.Gradation ntawm qhob aggregate

Haum aggregate gradation, pab kom txo tau cov ntshav, feem ntau cuam tshuam hauv cov xuab zeb, xuab zeb modulus ob yam.

Thaum cov xuab zeb me me dhau lawm, tus nqi ntawm mortar tsis txaus, thiab txaus mortar txheej tsis tuaj yeem tsim nyob ib puag ncig ntxhib aggregate rau lubrication thiab filling, uas yuav txo cov fluidity ntawm cov sib tov, ua kom cov cohesion thiab dej tuav ntawm cov pob zeb sib tov ua tsis zoo, ua kom cov pob zeb sib tov zoo li ntxhib, coarse aggregate sib cais, cement slurry poob, dej yog yooj yim los nag tawm. Qhov tsim nyog nce ntawm cov xuab zeb tuaj yeem txo cov ntshav; Lwm yam, ntshav tuaj yeem nce ntxiv. Kev cuam tshuam ntawm cov xuab zeb modulus ntawm cov dej los ntshav tiag tiag yog hais txog qhov tsawg tshaj plaws ntawm cov khoom sib sau., tshwj xeeb tshaj yog ib feem uas nws particle loj yog tsawg dua 0.315mm, uas yog qhov tseem ceeb tshwj xeeb rau kev tuav dej ntawm cov pob zeb. Txo cov qauv ntawm cov xuab zeb kom tsim nyog, los yog ntxiv cov av kom raug, pab txo cov ntshav pob zeb; Lwm yam, ntshav tuaj yeem nce ntxiv.

4 Kev sib xyaw ua ke

Qhob los ntshav qhov tseem ceeb tuaj yeem pom tau tias yog qib zoo ntawm kev sib cais, dej raws li cov kua theem, tag nrho cov khoom siv yog ib theem khoom, cov txheej txheem los ntshav yog dej khov tsis kam yog tsis txaus los kov yeej lub ntiajteb txawj nqus ntawm cement particles txheej txheem. Then consider adding some fine mixing materials, such as a fine fly ash, silicon ash, because these material particles is small, not be separated from water, and water evenly mixed together constitute the liquid phase, increasing the liquid viscosity, to enhance ability to prevent cement particles under the effect of gravity settlement, thus can reduce bleeding.

5 Cement

The contribution of cement to concrete bleeding is mainly two aspects, one is fineness, the other is admixture.

The increase in cement fineness has two positive effects on the reduction of bleeding. Ua ntej, the decrease of cement particle size means that the sedimentation speed is slowed down. Ntxiv rau, the finer the cement particles, the larger the specific surface area, the faster the reaction rate with water, the higher the viscosity, qhov ceev ntawm condensation thiab hardening ntawm lub system yuav, yog li ua rau txo qis hauv lub sijhawm ua haujlwm ntawm cov khoom seem deposition, thiab yog li txo cov dej los ntshav.

Kev sib txawv ntawm cov cement admixtures kuj ua rau qhov sib txawv ntawm cov ntshav los ntshav, uas yog tib yam li lub luag haujlwm ntawm cov pob zeb sib xyaw.

Qhob los ntshav yog ib rab ntaj ob sab, tsuas yog tswj cov ntshav txaus, nyob rau hauv thiaj li yuav xyuas kom meej lub du pob zeb pouring thiab hardening ntawm cov ntsuas. Qhov ntsuas ntawm cov dej los ntshav yog cuam tshuam los ntawm ntau yam xws li dej-txo tus neeg sawv cev, tshuaj sib tov, cement, tag nrho, huab cua kub, sib tov piv, thiab txoj kev tsim kho. Thaum pom tias cov pob zeb los ntshav yog siab dhau lossis qis dhau, cov units uas muaj feem nyob rau hauv upstream thiab downstream, suav nrog ob tog kev tsim kho, cov tuam txhab ua vaj tse, cov khoom siv raw khoom, tshwj xeeb tshaj yog admixture manufacturers, yuav tsum tau siv sij hawm ntsuas los xaiv ib lossis ntau lub tswv yim los tswj cov ntshav los ntawm qhov tsim nyog, uas yog qhov tsim nyog rau kev tshem tawm cov kev phom sij zais thiab ua kom ntseeg tau qhov zoo ntawm qhov project.

Cie-China.org yog tus thawj coj ua npuas dej ua ke muab kev pabcuam ua npuas ncauj ua npuas ncauj, superplasticizer,ua npuas ncauj qhob zog enhancer rau lub teeb yuag pob zeb, CLC blocks. Yog koj tab tom nrhiav foaming tus neeg sawv cev, thov koj txhob xav li cas tiv tauj peb.