Hnub Kawg:30,Jan,2023
Kev yoog raws thiab tsis sib haum xeeb ntawm qhov hu ua qhob admixture thiab cement tuaj yeem suav hais tias yog raws li hauv qab no: Thaum tsim cov pob zeb (los yog mortar), raws li cov kev qhia tshwj xeeb ntawm cov pob zeb sib xyaw ua ke, qee qhov admixture uas tau raug tshuaj xyuas kom ua tau raws li cov qauv tsim tau ntxiv rau cov cai.Yog tias cov cement siv cov khoom sib xyaw ntawm ntau yam tuaj yeem tsim cov nyhuv xav tau, cov cement yog sib xws nrog cov khoom sib xyaw.Ntawm qhov tsis sib xws, yog tias cov nyhuv tsis tsim, cov cement thiab cov khoom sib xyaw tsis haum.Piv txwv li, ib lub pob zeb superplasticizer ntxiv rau cov pob zeb uas tau npaj los ntawm tsib lub Portland cements zoo tib yam (kuaj kom ua tau raws li cov kev cai ntawm kev ua haujlwm siab dej txo cov qauv, thiab tag nrho lwm yam zoo ib yam, muaj ib qho kev sib xyaw ua ke los ntawm cov cement muaj qhov tsis txaus loj hauv Lwm cov cements tsis muaj qhov teeb meem no, yog li ntawd, nws tuaj yeem txiav txim siab tias cov cement no tsis haum rau superplasticizer, thiab lwm yam cements Cov dej txo cov neeg ua haujlwm siab yog tsim nyog. Piv txwv li, thaum cov pob zeb npaj rau hauv ib qho. Qee cov cement yog tov nrog ceev coagulant (kuaj kom ua tau raws li cov qauv tsim), tab sis tsis tau txais cov nyhuv nrawm, Ntxiv cov retarders tsis tau txais cov nyhuv retarding, tag nrho OK suav tias yog incompatible ntawm admixtures thiab cement.
Cement fineness cement particles muaj zog adsorption rau dej-txo tus neeg sawv cev molecules.Nyob rau hauv cov cement slurry nrog cov dej-txo tus neeg saib xyuas, qhov zoo dua cov cement hais, qhov loj dua qhov chaw tshwj xeeb, uas yog, cov dej-txo cov tshuaj molecules.Tus nqi ntawm adsorption kuj loj dua.Yog li ntawd, nyob rau hauv cov ntaub ntawv ntawm tib tus nqi ntawm cov dej txo tus neeg sawv cev, cov nyhuv plasticizing yog phem dua rau cov cement nrog ntau dua fineness.
Tam sim no qee cov tuam txhab cement zoo li txhim kho lub zog thaum ntxov ntawm cov cement.Rau cov cement fineness, thiaj li yuav ua tau zoo dua plasticizing nyhuv, nws yog ib qhov tsim nyog yuav tau nce tus nqi ntawm cov dej txo tus neeg sawv cev.Lub freshness thiab kub ntawm cov cement yog fresher, thiab cov plasticizer ntawm cov dej txo tus neeg saib xyuas qhov sib txawv yog qhov phem dua.Qhov no yog vim tias cov khoom siv hluav taws xob zoo ntawm cov cement tshiab muaj zog dua thiab cov peev txheej adsorption ntawm cov dej txo tus neeg sawv cev yog loj dua.Qhov kub ntawm cov cement ntau dua, qhov ua rau cov nyhuv plasticizing ntawm cov dej txo tus neeg sawv cev.Qhov poob poob tseem sai dua.Yog li ntawd, thaum qee qhov kev lag luam ua vaj tse cog qoob loo siv cov pob zeb uas nyuam qhuav tau milled thiab tseem poob cua sov, cov dej txo qis thiab qhov poob qis sai heev.Txawm tias tshwm sim nyob rau hauv lub blender Chang condensation li ntawd, peb yuav tsum xyuam xim thiab yuav tsum tau zam.
Post lub sij hawm: Jan-30-2023