Kev Tsim Kho Kev Lag Luam

Cov khoom siv pob zeb siv hauv kev tsim kho kev lag luam​

Pob zeb yog qhov tseem ceeb hauv kev tsim kho. Txhawm rau ua kom tau raws li qhov xav tau ntawm cov phiaj xwm niaj hnub no, cov khoom siv ntxiv yog qhov tseem ceeb. Cov additives no txhim kho cov khoom vaj khoom tsev xws li kev ua haujlwm, lub zog, thiab kav ntev. Kab lus no tshawb txog hom tseem ceeb siv hauv kev tsim kho kev lag luam ..

Dej - Txo cov neeg sawv cev (Plasticizers).

Dej - txo cov neeg ua haujlwm, lossis cov yas yas, txiav cov dej siv thaum tswj kev ua haujlwm. Txo cov dej - cement piv ua rau pob zeb muaj zog thiab ruaj khov dua. Lignosulfonates, los ntawm daim ntawv - ua los ntawm - cov khoom, adsorb on cement hais, dispersing lawv. Polycarboxylate - Ether (PCE) - raws li plasticizers yog cov qib siab dua. Lawv cov qauv tshwj xeeb muaj cov dej siab - txo kev ua haujlwm (15 - 35%) thiab kev tuav pov hwm zoo, zoo tagnrho rau cov haujlwm loj.

Retarding Agents

Retarding agents ncua kev teeb tsa. Hauv kev thauj mus los ntev, dej loj, lossis huab cua kub, xav tau lub sijhawm teem sijhawm ntev dua. Qab Zib thiab lawv cov derivatives, xws li qabzib thiab sucrose, inhibit cement hydration. Citric acid thiab citrates ua hauj lwm los ntawm complexing nrog calcium ions, slowing down lub hydration txheej txheem

Accelerating Agents

Accelerating agents ua kom cov pob zeb ua tiav. Nyob rau hauv huab cua txias los yog tej yaam num xav tau kev nce qib sai, lawv tseem ceeb heev. Calcium chloride, ib qho accelerator, tsub kom cov cement ntxhia solubility, txhawb kev tsim cov binding C - S - H gel. Txawm li cas los xij, nws siv yog txwv vim muaj peev xwm steel reinforcement corrosion. Alkali - raws li accelerators, xws li sodium carbonate, tsa cov sib xyaw pH kom nrawm hydration.

Huab cua - Entraining Agents

Cua - entraining agents qhia me me npuas npuas hauv pob zeb. Cov npuas no txhim kho kev ua haujlwm, tshwj xeeb tshaj yog nyob rau hauv cov dej qis - cement piv sib xyaw. Lawv ua raws li pob bearings, txo cov aggregate - paste kev sib txhuam. Cua - entrained qhob kuj tiv thaiv khov - thaw cycles zoo dua. Anionic surfactants, zoo li vinsol resin ntsev, txo qhov nro kom sib xyaw nrog huab cua. Synthetic surfactants muab kev tswj cov npuas ntau dua

Superplasticizers

Superplasticizers yog cov dej ntau - txo cov neeg ua haujlwm. Lawv tuaj yeem txiav cov ntsiab lus dej los ntawm 30 - 40% thaum ua haujlwm ua haujlwm. Nyob rau hauv siab - lub zog thiab nws tus kheej - consolidating pob zeb, lawv yog qhov tseem ceeb. Polycarboxylate - raws li superplasticizers, nrog lawv cov qauv tshwj xeeb, cuam tshuam cov cement zoo, ua tau raws li ntau yam kev xav tau.

Fiber Reinforcement Additives

Fiber reinforcement additives boost pob zeb tensile lub zog, ductility, thiab tawg kuj. Fibers choj tawg, tiv thaiv lawv kis. Hlau fibers, rau siab - lub zog thiab kev cuam tshuam - resistant daim ntaub ntawv xws li cov plag tsev, txhim khu load - bearing peev xwm. Polypropylene fibers, hnav thiab corrosion-resistant, tswj cov yas shrinkage tawg nyob rau hauv thaum ntxov hardening theem. Cov fibers ntuj, xws li cellulose los ntawm ntoo, muaj kev xaiv ruaj khov, txhim kho kev ua haujlwm thiab ductility.

Xaus

Concrete additives yog qhov tseem ceeb hauv kev tsim kho. Dej - txo cov neeg ua haujlwm, rov qab thiab nrawm cov neeg ua haujlwm, huab cua - entraining agents, superplasticizers, thiab fiber reinforcement additives txhua lub hom phiaj tshwj xeeb. Kev xaiv kom raug thiab siv cov khoom siv ntxiv no ua rau cov pob zeb ua kom zoo dua qub, ua tau raws li kev tsim kho ntau yam. Raws li kev lag luam nce siab, kev txhim kho ntxiv yuav txuas ntxiv txhim kho kev tsim kho kom zoo thiab zoo.