Yam dab tsi yog cov tshuaj txo cov dej thiab lawv tus kheej yam ntxwv yog dab tsi?

Cov dej-txo cov neeg ua haujlwm, tseem hu ua plasticizers lossis superplasticizers, yog cov tshuaj ntxiv siv hauv cov pob zeb thiab cov tshuaj khib sib xyaw kom txhim kho kev ua haujlwm, txo cov ntsiab lus dej, thiab txhim kho kev ua haujlwm ntawm cov khoom. Muaj ntau ntau hom dej-txo cov neeg ua haujlwm, txhua tus muaj nws tus yam ntxwv thiab kev siv. Nov yog qee yam hom:

1. Lignosulfonates: Lignosulfonates yog muab los ntawm cov ntoo pulp thiab yog ib qho ntawm cov laus tshaj plaws ntawm cov dej txo cov neeg ua haujlwm. Lawv feem ntau yog siv rau hauv kev sib xyaw ua ke los txhim kho kev ua haujlwm thiab txo cov ntsiab lus dej thaum tuav lub zog txaus. Lignosulfonates yog tus nqi-zoo thiab sib xws nrog ntau hom cement.
2. Naphthalene Sulfonates: Naphthalene sulfonate-raws li dej reducers muaj txiaj ntsig zoo ntawm kev txo cov dej hauv cov pob zeb sib xyaw thaum txhim kho ntws thiab ua haujlwm. Lawv tshwj xeeb tshaj yog tsim rau kev tsim cov pob zeb muaj zog nrog cov dej qis-rau-cement ratios. Naphthalene sulfonates kuj tseem tuaj yeem pab txo qhov kev pheej hmoo ntawm kev sib cais thiab los ntshav hauv pob zeb.
3. Melamine Sulfonates: Melamine-raws li dej reducers muab cov dej txo qis dua piv rau lignosulfonates thiab naphthalene sulfonates. Lawv muab kev ua haujlwm zoo heev, muaj zog thaum ntxov, thiab txhim kho durability hauv cov pob zeb sib tov. Melamine sulfonates feem ntau yog siv rau hauv cov ntawv ua haujlwm siab xws li precast thiab prestressed pob zeb.
4. Polycarboxylate Ethers (PCEs): Polycarboxylate ethers yog lub cim tshiab ntawm cov dej txo cov neeg ua haujlwm paub txog lawv cov kev ua haujlwm siab thiab ntau yam. Lawv tuaj yeem txo cov ntsiab lus ntawm cov dej hauv cov pob zeb sib tov thaum tuav cov dej ntws thiab ua haujlwm tau ntev. PCEs muaj kev sib raug zoo nrog ntau hom cement thiab cov khoom sib xyaw thiab feem ntau yog siv hauv kev sib koom ua ke ntawm tus kheej (SCC) thiab kev ua haujlwm siab (HPC).
5. Combination Admixtures: Qee cov dej-txo cov neeg ua haujlwm raug tsim los ua cov khoom sib xyaw ua ke, uas tuaj yeem suav nrog kev sib xyaw ntawm cov tshuaj sib txawv kom ua tiav cov hom phiaj kev ua tau zoo. Cov khoom sib xyaw no tuaj yeem ua rau muaj kev sib koom ua ke, xws li kev txhim kho slump tuav, txhim kho lub zog, lossis txo cov cua nkag.

Cov yam ntxwv ntawm cov tshuaj txo cov dej yuav muaj xws li:

• Kev Txo Dej: Lub luag haujlwm tseem ceeb ntawm cov neeg ua dej txo qis yog txo cov dej sib xyaw kom ua tiav qhov xav tau ntawm cov pob zeb lossis cov khoom sib tov. Qhov no pab txhim kho lub zog, ua haujlwm ntev, thiab ua haujlwm ntawm cov khoom siv thaum txo qis kev pheej hmoo ntawm kev sib cais thiab los ntshav.
• Kev ua haujlwm tau zoo: Cov dej-txo cov neeg ua haujlwm txhim kho kev ua haujlwm thiab kev ua haujlwm ntawm cov pob zeb sib xyaw, tso cai rau kev tso chaw yooj yim dua thiab sib koom ua ke yam tsis muaj kev cuam tshuam lub zog lossis kev sib koom ua ke. Lawv pab kom muaj kev sib faib ntawm cov sib sau ua ke thiab cov ntaub ntawv cementitious thoob plaws hauv qhov sib tov.
• Compatibility: Cov dej-txo cov neeg ua hauj lwm yuav tsum tau sib xws nrog lwm yam admixtures thiab additives siv nyob rau hauv qhob mixes, xws li cua-entraining agents, teem retarders, thiab accelerators. Compatibility ua kom ntseeg tau tias cov khoom xav tau thiab kev ua tau zoo ntawm cov pob zeb ua tiav yam tsis muaj kev phiv los yog kev phiv.
• Dosage Rate: Qhov ua tau zoo ntawm cov tshuaj txo cov dej yog nyob ntawm qhov ntau npaum li cas, uas feem ntau qhia raws li feem pua ​​​​ntawm cov khoom siv cementitious hauv kev sib xyaw. Qhov zoo tshaj plaws npaum li cas yuav txawv nyob ntawm seb yam xws li cement hom, aggregate yam ntxwv, ambient kub, thiab xav tau kev ua vaj tse.
• Teem Sijhawm: Qee cov dej-txo cov neeg ua haujlwm tuaj yeem cuam tshuam lub sijhawm teem sijhawm ntawm kev sib xyaw ua ke, ua kom nrawm lossis thim rov qab lub sijhawm pib thiab zaum kawg. Kev noj tshuaj kom raug thiab xaiv cov dej txo qis yog tsim nyog kom ua tiav qhov xav tau kev teeb tsa tus yam ntxwv rau kev tsim kho tshwj xeeb.
• Tus nqi thiab kev ua tau zoo: Kev txiav txim siab xws li tus nqi-zoo, kev ua tau zoo, thiab qhov project specifications ua lub luag haujlwm tseem ceeb hauv kev xaiv tus neeg saib xyuas dej kom tsim nyog rau ib daim ntawv thov tshwj xeeb. Nws yog ib qho tseem ceeb rau kev ntsuam xyuas cov txiaj ntsig thiab kev txwv ntawm ntau hom dej reducers los txiav txim siab qhov kev xaiv tsim nyog tshaj plaws rau qhov yuav tsum tau ua.

Cov dej-txo cov neeg ua haujlwm ua lub luag haujlwm tseem ceeb hauv kev ua kom zoo dua qhov kev ua tau zoo thiab ua haujlwm ntev ntawm cov pob zeb thiab mortar sib tov, tso cai rau kev tsim kho kom zoo thiab txhim kho cov khoom tiav.