Concrete Superplasticizer

concrete superplasticizer yog ib qho khoom tseem ceeb siv hauv kev tsim concrete ua haujlwm siab. Nws pab txhim kho kev ua haujlwm thiab zog ntawm concrete ua haujlwm siab ua ke nrog silica pa phem, fly ash, slag, lossis lwm yam ntxiv.

Superplasticizers (SP) yog cov macromolecules soluble hauv dej, ntau pua npaug loj dua cov molecule dej. Lawv nqus rau C3A hauv cov cement thiab tso dej kaw.

Hauv ib qho sib tov pob zeb, cov superplasticizers no raug ntxiv nrog qhov siab tshaj plaws 2 feem pua ntawm tag nrho dej. Cov sib tov tom qab ntawd sib tov tsawg kawg nkaus 3 feeb nrog lub tshuab txiav lossis 5 feeb nrog mortar mixer.

Kev ntxiv superplasticizers txo dej hauv cov pob zeb sib tov yam tsis txo zog lossis ua haujlwm tau ntawm qhov sib tov. This can save a lot of money on construction materials as well as time.

It also helps to prevent segregation in aggregate-based mixes.

A common problem with using superplasticizers is that they tend to lose their workability quickly. This may cause difficulties when placing concrete as ready-mixed delivery trucks must be able to make long trips between job sites.

These problems can be addressed by using the opposite of a high range water reducer: viscosity modifying admixtures (VMA). VMAs are powdered admixtures that reduce the slump of concrete and help to prevent segregation in aggregate-based concrete.

The strength of high-performance concretes containing SMF and SNF-type superplasticizers is higher than that of reference concrete made at the same slump with no admixture, even if the water:cement ratio is equal. However, the enhancement of strength is mainly attributable to the reduction in water content caused by the use of these admixtures.