Lub teeb yuag qhob ntxiv | Kev Ua Haujlwm Siab Ua Foaming Cov Neeg Sawv Cev Rau Cov Khoom Siv Ntawm Tes
A cement water reducer yog ib qho tshuaj ntxiv uas txo qhov dej siv hauv pob zeb nplaum. Qhov txo dej no tso cai rau pob zeb nplaum hydrate qeeb dua, muab zog thiab ruaj khov dua.
Cov khoom txo dej qis, hu ua cov txo dej ib txwm lossis cov plasticizers niaj hnub, feem ntau txo qhov dej hauv ib qho sib tov los ntawm 5 rau 10%. Cov tshuaj txo dej no feem ntau siv hauv kev siv pob zeb niaj hnub xws li txoj kev tsav tsheb, txoj kev taug kev, thiab phab ntsa hauv qab av.
Nruab nrab dej txo qis, hu ua plasticizers lossis intermediate plasticizers, feem ntau txo qhov dej xav tau hauv kev sib tov pob zeb los ntawm 15 rau 20%. Cov khoom ntxiv no feem ntau siv hauv pob zeb nplaum rau kev ua haujlwm flat, xws li txoj kev tsav tsheb thiab txoj kev taug, vim lawv txo dej uas xav tau los ua kom tau ib qho nto zoo.
High-range dej reducers, hu ua superplasticizers lossis high-range admixtures, are synthetic water-soluble organic compounds that decrease the amount of water in concrete by 25 rau 30%. This results in a higher fluidity of the concrete, allowing it to flow better and provide more flexibility for placements.
These admixtures are usually added to the concrete mixture at a low dosage rate, although some high-range admixtures require a higher dose for optimal performance.
Most of these admixtures have no effect on the hydration of the cement, but some – like polycarboxylates – may increase air entrainment. This will vary depending on the chemistry of the admixture and its dosage rate. It is important to select the proper admixture for the application.