Puas Muaj Peev Xwm Ntawm Polycarboxylic Superplasticizer Loj?

Hauv Suav teb, polycarboxylate superplasticizers tam sim no nyob ntau dua 85% ntawm kev ua lag luam. Lawv tsis tsuas yog siv dav hauv cov pob zeb sib xyaw ua ke tab sis kuj ua lub luag haujlwm tsis tuaj yeem hloov pauv hauv cov pob zeb precast. Nyob rau hauv lub neej yav tom ntej, polycarboxylate superplasticizers yuav txuas ntxiv mus ua lub ntsiab lus tseem ceeb rau cov kws tshawb fawb ntawm cov khoom sib xyaw ua ke ob qho tib si hauv tsev thiab txawv teb chaws.

Yawg Wang Xiaoqing, tus tsim ntawm Borida, tau ntsib tus kheej thiab koom nrog tag nrho cov kev taug kev ntawm polycarboxylate superplasticizers los ntawm lawv qhov pib mus rau lawv txoj kev loj hlob tam sim no. Tsis ntev los no, thaum lub rooj sib tham ntawm tuam txhab txhua lub lim tiam, nws tau taw qhia tias cov kev cov nyom tshiab cuam tshuam nrog cov khoom siv raw thiab cov kev xav tau ntawm engineering yuav muaj nyob rau lub sijhawm ntev. Yog li ntawd, txoj haujlwm rau cov neeg ua haujlwm sib xyaw ua ke tseem tsis txaus ntseeg, thiab kev tshawb fawb ntawm polycarboxylate superplasticizers tseem vam meej.

Kev Tshawb Fawb Kev Ua Haujlwm Tsis Txaus

Polycarboxylate superplasticizers yog lub cim thib peb ntawm superplasticizers, tom qab lignosulfonate thiab naphthalene-based superplasticizers. Lawv cov yam ntxwv muaj xws li kev siv tshuaj tsawg (kwv yees li 0.20% cov ntsiab lus khoom), cov dej txo qis (tsis pub tsawg dua 25%, nce mus txog 35%), cov teebmeem tseem ceeb (28- hnub compressive zog txhim kho tsis tsawg tshaj li 30%), thiab qhov cuam tshuam tsawg kawg nkaus ntawm kev ua vaj tse shrinkage (28-hnub shrinkage tsis tshaj 110%). Tsis tas li ntawd, polycarboxylate superplasticizers yog tsim los ntawm cov khoom tsis zoo xws li formaldehyde. Lawv cov qauv molecular tuaj yeem tsim kho tau yooj yim, tso cai rau cov khoom sib txuas ntawm cov khoom siv nrog ntau lub zog, suav nrog kev tso tawm qeeb, los tiv thaiv cov nplaum, thiab cov khoom tsis muaj cua nkag, uas tau ua rau lawv nyiam dav.

Nyob rau hauv lub rooj sib tham, Wang Xiaoqing tau hais tias tsis yog tsuas yog ua nws tus kheej-compacting pob zeb thiab high-lub zog los yog ultra-high-strength qhob cia siab rau polycarboxylate superplasticizers rau cov dej-cement ratios tsawg (0.30- 0.45) thiab ultra-low water-cement ratios (0.15–0.30), tab sis cov pob zeb zoo tib yam kuj nyob ntawm lawv cov kev txhawb nqa. Txoj kev loj hlob ntawm polycarboxylate superplasticizers nyob rau hauv Suav teb tau dhau mus rau theem: kev sib cuag thawj zaug, kev sim siv cov khoom lag luam, kev tshawb fawb ywj pheej thiab kev tsim kho, kev tsim cov khoom lag luam thiab daim ntawv thov normalization, kev txhawb zog loj, thiab kev tsim khoom loj thiab daim ntawv thov. Txawm li cas los xij, raws li polycarboxylate superplasticizers tseem tsis tau ua tiav cov kev xav tau tshiab ntawm kev tsim vaj tsev ua vaj tse thiab cov teeb meem tshiab los ntawm cov khoom siv raw, kev tshawb fawb tsis tuaj yeem so.

Cov Kev Sib Tw Tshiab Yuav Tsum Tau Txais Cov Tshuab Tshiab

Txawm hais tias muaj txiaj ntsig tseem ceeb hauv kev tshawb fawb, kev tsim khoom, thiab kev siv cov khoom sib xyaw ua ke hauv Suav teb, ntau qhov kev sib tw tseem nyob. Polycarboxylate superplasticizers yog siv los txhim kho kev ua haujlwm (flowability, cohesiveness, thiab dej tuav) ntawm cov pob zeb sib tov, tab sis lub zej zog engineering muaj kev txhawj xeeb txog lawv cov teebmeem ntawm huab cua nkag, teeb tsa lub sijhawm, thiab cov khoom siv kho tshuab, deformation, thiab durability ntawm hardened. pob zeb. Tsis tas li ntawd, lub xeev cov lus piav qhia ntawm cov pob zeb sib xyaw-xws li nyias, tuab, nplaum, thiab cov kua dej-muaj feem cuam tshuam tsis yog rau qhov zoo ntawm lwm cov ntaub ntawv raw tab sis kuj rau cov yam ntxwv ntawm polycarboxylate superplasticizers siv. Yog li, cov kws tshawb fawb thiab cov neeg tsim khoom ntawm polycarboxylate superplasticizers yuav tsum tsis txhob tso tseg lawv txoj kev siv zog thiab yuav tsum tau tshawb xyuas cov cheeb tsam no mus ntxiv.

Cov xwm txheej ntawm cov cement feem ntau zoo ib yam li "lub qhov muag tsis pom kev," vim nws nyuaj kom tau txais cov ntaub ntawv hais txog clinker hauv cov cement, hom thiab qhov sib piv ntawm cov khoom sib xyaw, thiab txawm tias cov khoom siv raw khoom sib tsoo, clinker sib tsoo cov cuab yeej, thiab cov khoom siv ntxiv. Cov pab pawg tshawb fawb tab tom tsim cov khoom siv sib tsoo polycarboxylate los xyuas kom muaj kev sib raug zoo ntawm cov cement thiab polycarboxylate superplasticizers. Txoj kev hloov tsis tau hloov pauv dej xuab zeb nrog cov xuab zeb tsim tau nthuav tawm lwm qhov kev sib tw. Hauv kev teb, ntau tus kws tshawb fawb tau ua kom zoo dua cov qauv molecular ntawm polycarboxylate superplasticizers txhawm rau txhim kho kev ua haujlwm thiab muab cov haujlwm tshwj xeeb, suav nrog kev xaiv hom thiab qhov hnyav ntawm cov monomers loj, qhia cov pab pawg ua haujlwm sib txawv, thiab kho cov kua qaub-ether piv thiab tag nrho qhov hnyav molecular. Tshawb nrhiav qhov muaj peev xwm ntawm kev sib xyaw ua ke ntawm polycarboxylate superplasticizers nrog qee qhov kev sib xyaw ua haujlwm kom ntseeg tau tias cov dej txo qis thaum lub sijhawm ntsib kev xav tau xws li kev tiv thaiv kev poob qis, tiv thaiv-stick, thiab kev tswj xyuas lub zog kuj tsim nyog sim, muab lawv cov kev sib raug zoo thiab solubility tuaj yeem ua kom ntseeg tau.

Cov pa roj carbon tsawg dhau los ua txoj kev txhim kho tseem ceeb

Nrog rau kev txhim kho hauv zej zog, qhov kev xav tau ntawm cov khoom vaj khoom tsev hais txog kev txuag nqi, txo cov khib nyiab, kev siv hluav taws xob, kev txo qis, thiab cov pa roj carbon tsawg tau nce siab. Nyob rau tib lub sijhawm, polycarboxylate superplasticizers tau lees paub los ntawm cov kws tshaj lij rau lawv lub luag haujlwm hauv kev txo qis qis thiab cov pa roj carbon tsawg hauv kev lag luam pob zeb.

Cov pa roj carbon emissions thaum lub sij hawm npaj ntawm polycarboxylate superplasticizers yog qhov tsawg, thiab piv rau cov emission txo cov teebmeem uas tsim los ntawm lawv cov kev siv tau zoo hauv cov pob zeb, cov emissions no tuaj yeem suav tias yog qhov tsis txaus ntseeg. Sun Zhenping tau sau tseg tias kev tsim ib tuj ntawm silicate cement-los ntawm cov khoom siv raw los ntawm kev ua cov khoom siv raw, clinker calcination, rau cov khoom sib tsoo-tsim kwv yees li 0.85 tons ntawm carbon dioxide. Raws li lub ntiaj teb cov neeg tsim khoom cement loj tshaj plaws, Tuam Tshoj ntsib cov haujlwm ceev ceev hauv kev txuag hluav taws xob thiab txo qis emissions hauv kev lag luam cement. Txhawm rau txo qis kev siv hluav taws xob thiab txo cov pa roj carbon emissions hauv kev lag luam cement, kev siv cov pob zeb sib xyaw thiab superplasticizers yog qhov tseem ceeb. Mineral admixtures tsim los ntawm ntau yam khoom pov tseg los ntawm kev ua haujlwm yooj yim yog qhov tseem ceeb tshwj xeeb rau kev ua kom tawg ntawm polycarboxylate superplasticizers.

Thaum siv cov polycarboxylate superplasticizers, nws yog ib qho tseem ceeb uas yuav tsum xav txog ob qho tib si lawv cov adsorption thiab dispersing los ntawm cov cement hais, nrog rau kev cuam tshuam ntawm cov ntaub ntawv ntxiv xws li ya tshauv, slag hmoov, limestone hmoov, thiab tailings ntawm lawv adsorption. Txawm hais tias qee cov khoom siv ntxiv tuaj yeem muaj qhov adsorption qis dua li cov cement, qhov adsorption ntawm coal gangue hmoov thiab inferior ya tshauv tuaj yeem yog qhov tseem ceeb. Txoj kev loj hlob ntawm alkali-activated binders thiab low-carbon cements (xws li LC3 cement) tuaj yeem qhia cov kev cov nyom tshiab rau kev siv cov polycarboxylate superplasticizers, vim cov qauv tshwj xeeb xws li metakaolin thiab cov av nplaum uas tsis kub kub tuaj yeem ua rau lawv cov adsorption tus nqi, yog li cuam tshuam rau lawv cov dispersing. cuam ​​tshuam hauv pob zeb.

Hauv cov ntsiab lus ntawm lub teb chaws tseem ceeb ntawm kev txuag hluav taws xob, kev txo qis emissions, thiab kev hloov pauv ntsuab thiab kev txawj ntse ntawm kev tsim kho kev lag luam, cov teeb meem ntsib kev lag luam ua vaj tse nyob rau hauv kev sib raug zoo nrog polycarboxylate superplasticizers sawv cev rau ob qho tib si nyuaj thiab cov hauv kev. Muab cov qauv tsim muaj zog ntawm cov qauv molecular ntawm polycarboxylate superplasticizers, cov kev cov nyom no tuaj yeem txhawb kev loj hlob ntxiv hauv kev lag luam. Ib qho ntawm cov lus qhia tseem ceeb rau kev txhim kho yav tom ntej ntawm polycarboxylate superplasticizers yuav yog los daws cov teeb meem kev sib raug zoo nrog cov pob zeb sib tov nyob rau hauv cov xwm txheej tsawg-carbon. Txhawm rau ua tiav qhov no, kev hloov kho tuaj yeem ua rau cov qauv molecular ntawm polycarboxylate superplasticizers, lossis sib xyaw nrog lwm hom kev sib xyaw tuaj yeem tshawb nrhiav los txhim kho kev sib raug zoo, txawm tias cov kev daws teeb meem no tseem xav tau kev tshawb fawb tob.