Hnub Kawg: 22 Lub Ib Hlis, 2024
1.Qhov ntau npaum li cas ntawm polycarboxylate superplasticizer dej-txo tus neeg sawv cev yog loj heev, thiab muaj ntau npuas nyob rau saum npoo ntawm cov pob zeb ua qauv.
Los ntawm qhov kev xav ntawm pumpability thiab durability, nws yog qhov zoo rau kom tsim nyog nce cov khoom cua-entraining. Ntau cov polycarboxylate dej-txo cov neeg ua haujlwm muaj cov cua nkag siab zoo. Polycarboxylic acid-raws li dej-txo admixtures kuj muaj ib tug saturation point zoo li naphthalene-raws li dej-txo admixtures. Rau ntau hom cement thiab sib txawv cov cement ntau npaum li cas, cov ntsiab lus saturation ntawm cov khoom sib xyaw no hauv cov pob zeb sib txawv. Yog hais tias tus nqi ntawm admixture yog ze rau nws cov ntsiab lus saturation, qhov fluidity ntawm cov pob zeb sib tov tsuas yog tuaj yeem txhim kho los ntawm kev kho tus nqi ntawm slurry hauv cov pob zeb lossis siv lwm txoj hauv kev.
Phenomenon: Ib qho chaw sib xyaw ua ke tau siv polycarboxylic acid-raws li dej-txo tus neeg sawv cev los npaj pob zeb rau lub sijhawm. Tam sim ntawd muaj ib hnub, ib qhov chaw tsim kho tau tshaj tawm tias tom qab tshem tawm cov formwork ntawm phab ntsa shear, nws pom tias muaj npuas ntau dhau ntawm phab ntsa thiab cov tsos tsis zoo.
Yog vim li cas: Hnub uas nchuav pob zeb, qhov chaw tsim kho tau tshaj tawm ntau zaus tias qhov slump me me thiab fluidity tsis zoo. Cov neeg ua hauj lwm ntawm lub luag hauj lwm nyob rau hauv lub laboratory ntawm lub pob zeb mixing chaw nres tsheb nce tus nqi ntawm admixtures. Qhov chaw tsim kho siv cov hlau zoo li loj, thiab cov khoom siv ntau dhau tau ntxiv rau ib zaug thaum lub sij hawm nchuav, ua rau muaj kev vibration tsis sib xws.
Kev Tiv Thaiv: Txhim kho kev sib txuas lus nrog rau qhov chaw tsim kho, thiab pom zoo kom siv qhov siab thiab kev vibration txoj kev ua haujlwm nruj me ntsis raws li cov lus qhia tshwj xeeb. Txhim kho qhov fluidity ntawm cov pob zeb sib tov los ntawm kev kho tus nqi ntawm slurry hauv cov pob zeb lossis siv lwm txoj hauv kev.
2.Polycarboxylate dej-txo tus neeg sawv cev yog sib xyaw ntau dhau thiab lub sijhawm teem sijhawm ntev.
Phenomenon:Lub slump ntawm pob zeb yog loj, thiab nws yuav siv sij hawm 24 teev rau cov pob zeb thaum kawg teem. Nyob rau ntawm qhov chaw tsim kho, 15 teev tom qab lub teeb pom kev zoopob zeb tau nchuav, nws tau tshaj tawm rau qhov chaw sib tov uas ib feem ntawm cov pob zeb tseem tsis tau khov. Qhov chaw sib tov tau xa ib tus kws tshaj lij los xyuas, thiab tom qab kev kho cua sov, qhov kawg solidification siv sijhawm 24 teev.
Yog vim li cas:Tus nqi ntawm cov dej-txo lub hnub nyoognt yog qhov loj, thiab qhov kub ntawm qhov nruab nrab yog qhov tsawg thaum hmo ntuj, yog li cov pob zeb hydration cov tshuaj tiv thaiv qeeb. Cov neeg ua haujlwm tshem tawm ntawm qhov chaw tsim kho tsis pub leej twg paub ntxiv dej rau cov pob zeb, uas siv dej ntau heev.
Kev Tiv Thaiv:Tus nqi ntawm admixture shyuav tsim nyog thiab qhov ntsuas yuav tsum yog. Peb ceeb toom rau koj kom xyuam xim rau kev rwb thaiv tsev thiab kev saib xyuas thaum qhov kub ntawm qhov chaw tsim kho qis, thiab cov khoom siv polycarboxylic acid yog rhiab heev rau kev siv dej, yog li tsis txhob ntxiv dej ntawm qhov xav tau.
Post lub sij hawm: Jan-24-2024
