polycarboxylate superplasticizers
Oct 30, 2023
Kev lag luam ua kom muaj dej-txo cov neeg ua haujlwm siab, tseem hu ua polycarboxylate superplasticizers, ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm thiab lub zog ntawm pob zeb thiab lwm yam khoom siv. Hauv tsab xov xwm no 600- lo lus, peb yuav delve rau hauv cov ntsiab lus tseem ceeb ntawm kev lag luam no, suav nrog cov khoom ntsuas kev ua tau zoo xws li tus nqi txo cov dej thiab cov lus pom zoo.
Polycarboxylate superplasticizers, feem ntau hu ua PCEs, yog cov khoom siv tseem ceeb hauv kev tsim kho thiab kev lag luam pob zeb. Lawv yog cov organic tebchaw uas muaj peev xwm txo tau dej hauv cov ntaub ntawv cementitious. Lub peev xwm no los txo cov ntsiab lus dej thaum tswj cov kev xav tau ntawm kev sib tov yog qhov tseem ceeb rau kev ua haujlwm ntawm kev tsim kho. Kev ua tau zoo ntawm PCEs feem ntau ntsuas raws li lawv cov dej txo qis, uas yog qhov tseem ceeb ntawm kev ntsuas kev ua haujlwm.
Cov dej txo tus nqi ntawm polycarboxylate superplasticizer yog hais txog qhov uas nws tuaj yeem txo cov dej uas xav tau los tswj cov kev xav tau ntawm cov pob zeb sib xyaw. Qhov kev txo qis hauv cov ntsiab lus dej no ua rau muaj ntau yam txiaj ntsig, suav nrog kev muaj zog ntxiv, txhim kho durability, thiab txo permeability ntawm pob zeb. Cov dej txo qis ntawm PCEs tuaj yeem sib txawv nyob ntawm cov khoom tshwj xeeb, tab sis nws feem ntau yog li ntawm 20% txog 40%.
Ntxiv nrog rau qhov txo qis dej, qhov kev pom zoo ntawm PCEs yog qhov tseem ceeb uas yuav tsum tau xav txog. Txoj kev noj tshuaj kom ntseeg tau tias cov pob zeb tuav nws txoj haujlwm thiab lub zog thaum txo cov khoom siv thiab cov nqi tsim khoom. Qhov ntau npaum ntawm polycarboxylate superplasticizer feem ntau qhia raws li feem pua ntawm tag nrho cov ntsiab lus ntawm cov cementitious. Qhov kev pom zoo npaum li cas tuaj yeem sib txawv nyob ntawm seb yam khoom xws li cov khoom tshwj xeeb, ib puag ncig, thiab cov khoom ua vaj tse uas xav tau. Txawm li cas los xij, qhov ntau npaum li cas poob ntawm {{0}}.2% mus rau 1.0% ntawm cov ntsiab lus cementitious.
Kev xaiv ntawm cov khoom siv polycarboxylate superplasticizer thiab nws qhov ntau npaum li cas yog nyob ntawm ntau yam, nrog rau qhov kev xav tau ntawm qhov project, hom kev sib xyaw ua ke, thiab ib puag ncig. Piv txwv li, nyob rau hauv cov huab cua kub, ib tug PCE nrog ib tug high water txo tus nqi thiab ib tug tsawg npaum li cas yuav zoo dua los mus tiv thaiv lub premature ntawm lub pob zeb. Piv txwv li, nyob rau hauv cov huab cua txias, PCE nrog lub sij hawm qeeb qeeb thiab ntau dua me ntsis yuav raug siv los ua kom muaj kev ua haujlwm zoo.
Nws yog ib qho tseem ceeb los xaiv cov khoom lag luam polycarboxylate superplasticizer uas haum rau cov kev xav tau tshwj xeeb ntawm qhov project, vim tias PCEs txawv yuav muaj qhov sib txawv ntawm kev ua tau zoo. Tsis tas li ntawd, kev sib raug zoo ntawm PCE nrog rau lwm cov khoom sib xyaw thiab cov khoom siv tsim kho yuav tsum raug txiav txim siab kom ua tiav cov txiaj ntsig xav tau.
Hauv kev xaus, kev lag luam ua kom muaj dej-txo cov neeg ua haujlwm siab, tshwj xeeb tshaj yog polycarboxylate superplasticizers, ua lub luag haujlwm tseem ceeb hauv kev tsim kho niaj hnub los ntawm kev txhim kho cov khoom vaj khoom tsev. Tus nqi txo cov dej, feem ntau yog li ntawm 20% mus rau 40%, yog qhov tseem ceeb ntawm PCE qhov ua tau zoo. Ntxiv mus, qhov pom zoo noj ntawm cov additives no, feem ntau ntawm 0.2% mus rau 1.0% ntawm cov ntsiab lus cementitious, yog qhov tseem ceeb rau kev ua tiav qhov xav tau kev ua haujlwm thiab lub zog ntawm cov pob zeb sib xyaw. Xaiv cov khoom PCE zoo thiab ntau npaum li cas yog qhov tseem ceeb rau kev ua tiav ntawm kev tsim kho, thiab cov yam ntxwv xws li qhov yuav tsum tau ua thiab ib puag ncig yuav tsum tau xav txog.
