Lub teeb pob zeb Additives | High-Performance Foaming Agents rau Cellular Concrete
Foaming Agent for Foam Concrete has an extremely critical impact on the quality of foamed concrete. High-quality Foaming Agent can make high-quality foamed concrete. The performance of Foaming Agent for Foam Concrete is not only related to the stabilization time and uniformity of the foam, but also to the size of the bubble and the bleeding rate.
The foam diameter of Foaming Agent for Foam Concrete is not as big as possible, it should be about 1mm
The pores have the same requirements for the pore diameter, and the same should be the same for the bubble diameter. Many producers ask the foam pore size to be as small as 0.1mm. Qhov tseeb, it is because if the physical foaming has a large foam diameter, the stability of the foam is poor and foamed concrete cannot be made. The same raw materials and formula, the same equipment and technology, just change the bubble diameter, the compressive strength of foam concrete with 1mm bubble diameter is at least 20% higher than that of foam concrete with 0.1mm bubble diameter. Yog li ntawd, it is wrong to pursue a large bubble diameter of 0.1mm or more. It is a misunderstanding in the production of foam concrete and should be corrected.
Foaming Agent for Foam Concrete's foam bleeding rate is as low as possible, tsis txhob siv cov kua mis ua npuas ncauj
According to the size of water content, foam is divided into milky foam with more water and less foam and sponge foam with more and less water. Ntawm lawv, milky foam is unqualified and inferior foam and cannot be used.
After the foam of the Foaming Agent for Foam Concrete is produced, it gradually oozes water. The bleeding consists of two parts:
(1) Los ntshav ntawm ua npuas ncauj ua kua zaj duab xis. This part of water is secreted from the liquid film, which is the water secreted by the liquid film under the combined action of gravity drainage, nto nro ntws, and liquid film destruction drainage. Lub thicker cov kua zaj duab xis ntawm cov npuas dej, the greater the bleeding; the faster and more the foam bursts, the greater the bleeding.
(2) Water between bubbles. This part is water with no bubble liquid film formed. The worse the foaming performance of Foaming Agent for Foam Concrete and the foaming machine, the more water between the bubbles that cannot form a foam liquid film. They are actually water that can't become bubbles.
When the bleeding rate of the foam is high, it will be as thin as floating juice, turbulent flow, can not pile up, the amount of water in the foam is very large. Thaum zoo li no ua npuas ncauj ntxiv rau cov cement slurry, cov cement slurry ua nyias heev, but the foam is very small, the volume of the slurry is small, and the foamed concrete produced has a high density, uas tsis tau raws li cov kev cai.
Yog li ntawd, milky ua npuas ncauj tsis tuaj yeem siv. The appearance of the foam that meets the technical requirements should be spongy, fine and small bubbles, pawg zoo li huab dawb, like bounced cotton, thiab yuav tsis ntws random. The water content of this foam is very small. This shows that its foam liquid film has little bleeding, the foam is not easy to burst, muaj dej me me ntawm cov npuas, and the amount of bubbles is large, and most of the volume is air bubbles. What needs to be emphasized here is that the sponge foam must be small bubbles with a bubble diameter of less than 1mm, not large bubbles of a few millimeters or even tens of millimeters. Large bubbles are easy to pile up, and they look like white clouds, tab sis vim lub npuas taub loj heev, nws kuj tsis tsim nyog.
The low bleeding of foam is required to ensure the number of bubbles in the foam and the porosity of the foam concrete, which is to ensure the density of the foam concrete.
The foam of Foaming Agent for Foam Concrete has no side effects on cementitious materials
Cementitious material is the main source of the strength of foam concrete. The addition of Foaming Agent for Foam Concrete cannot affect its gelation, uas yog, it does not produce negative gelation effects. This cannot be achieved by all kinds of bubbles.
Hauv kev sim mus ntev, we have found that many foams hinder the gelation of cement, magnesite and gypsum, uas tuaj yeem txo lub zog ntawm foamed pob zeb, and sometimes even the hardened concrete basically loses its strength. The stability of these foams is very good. It lasts for a few hours. It looks like a sponge, has low bleeding, and has a uniform density. It meets the technical requirements in all aspects, tab sis nws tsis sib xws nrog cov khoom siv gelling, so it cannot be used in production. . This shows that foams that are qualified in other aspects, such as the impact strength, are ultimately not technical requirements.
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