Hnub Tim:14,Mar,2022

Ib qho admixture txhais tau tias yog cov khoom uas tsis yog dej, cov khoom sib xyaw ua ke, kev sib xyaw ua ke tshiab, teeb tsa lossis tawv tawv thiab ua ntej sib xyaw Cov. Raws li tau sau tseg hauv Tshooj 1, cov tshuaj admixture feem ntau yog txhais tau tias yog calpium hydrozide (tsis muaj calrozide (admixture nyob rau hauv daim ntawv ntawm kua, raug ncua lossis dej-soluble khoom.

Dej-txo qhov admixtures txhim kho cov yas (ntub dej) thiab tawv-tswj tau tso rau hauv cov pob zeb ua thiab ua tiav nyob rau hauv lwm qhov kub. Ob leeg, thaum siv tsim nyog, ua rau cov kev coj ua zoo. Kuj, ob qho tib si admixtures yuav tsum ua kom tau raws li qhov yuav tsum tau ua ntawm Astm C 494 (saib cov lus 1).

Dej-txo cov lus admixtures

Dej Reducers ua qhov tseem ceeb uas: txo tus nqi ntawm cov dej sib tov uas yuav tsum tau txais cov khoom pov tseg. Qhov no tuaj yeem ua rau txo cov dej-tsw qab paj (w / c piv txwv), uas ua rau muaj zog dua thiab ntau dua ruaj khov.

Txo tus w / c piv ntawm cov pob zeb ua tau pom tias yog qhov tseem ceeb tshaj plaws los ua kom ruaj, zoo-ua vaj tse. Ntawm qhov tod tes, qee zaum cov ntsiab lus xis mas yuav raug txo qis thaum tswj tus thawj w / c piv rau cov dej los txo cov roj ntoo.

Dej-txo cov lus admixtures kuj tseem txo qis cais thiab txhim kho cov cua ntawm cov pob zeb. Yog li ntawd, lawv feem ntau siv rau kev nqus cov kev siv ua vaj tse ib yam nkaus.

Dej-txo cov lus admixtures feem ntau poob rau hauv peb pawg: tsawg-, nruab nrab- thiab ntau-ntau. Cov pab pawg no yog ua raws li cov dej txo rau admixture. Qhov feem pua ​​ntawm cov dej txo qis yog txheeb ze rau cov khoom sib xyaw ua ntej yuav tsum tau txais ib qho poob (saib cov lus 2).

Thaum txhua tus neeg txo cov dej muaj qhov sib thooj, txhua tus muaj daim ntawv thov uas tsim nyog uas nws yog qhov zoo tshaj plaws. Cov lus 3 nthuav tawm cov ntsiab lus ntawm peb hom dej-txo cov lus admixtures, lawv cov dej txo thiab lawv thawj siv. Lawv cov nyhuv ntawm huab cua nkag yuav sib txawv raws li cov chemistry.

Lawv ua haujlwm li cas

Thaum Caas los rau hauv kev sib cuag nrog dej, dissimilar Hluav Taws Xob Cov nqi ntawm cov npoo ntawm cov cement ntxias tau ib leeg, uas ua rau flocculation lossis pab pawg ntawm cov lus. Ib feem zoo ntawm cov dej yog nqus hauv cov txheej txheem no, yog li coj mus rau cohesive sib tov thiab txo qis qis.

Dej-txo cov admixtures qhov tseem ceeb nruab nrab ntawm cov khoom saum npoo ntawm cov khoom noj thiab ua rau txhua qhov chaw kom muaj zoo li nqi. Txij li cov lus nrog cov nqi sib tw rov qab ib leeg, lawv txo qis flocculation ntawm cov movent hais tawm thiab pub rau kev rho tawm zoo dua. Lawv kuj tseem txo cov viscosity ntawm cov muab tshuaj txhuam, uas ua rau muaj qhov qis dua.

Rooj 4 nthuav qhia qee cov ntaub ntawv uas cov ntaub ntawv tshaj plaws rau txhua tus neeg Reducer ntau yam. Lwm cov khoom siv kuj tau ntxiv nyob ntawm cov khoom lag luam thiab cov chaw tsim khoom. Ib co dej-txo cov lus admixtures muaj cov kev cuam tshuam theem nrab lossis ua ke nrog cov neeg so lossis cov neeg soj ntsuam.