Contents of this article
What types of antifreeze cement are there?
How to deal with cement mortar at minus 15 degrees Celsius?
What is the ratio of c20 concrete antifreeze?
How long will it take for the cement floor to be protected from freezing?
What to do if the anti-crack mortar in exterior wall insulation construction freezes?
What types of antifreeze cement are there?
Portland cement, ordinary Portland cement
Portland cement is Portland cement clinker mixed with 0 to 5% limestone or granulated blast furnace slag. and other mixtures, as well as cement made by mixing and grinding gypsum. Portland cement: fast setting and hardening, high early strength; large heat of hydration; good frost resistance; poor heat resistance; poor corrosion resistance; poor dry shrinkage Small.
2. Ordinary cement: sets and hardens quickly, has high early strength; has a large heat of hydration; has good frost resistance; has poor heat resistance; has poor corrosion resistance; and has poor drying shrinkage. Small.
How to deal with cement mortar at minus 15 degrees Celsius?
A temperature around zero will be detrimental to the hardening of cement, but it is not absolute. It should be noted that antifreeze and warmth must be carried out. It should not be possible to build a house in a particularly cold area.
Powder exterior walls can be used as the ground for a few days when the temperature is relatively high. It only takes 3 or 5 days. Interior walls will not be affected.
Stop working in subzero temperatures whenever possible. When the temperature is above minus 10 degrees, cement antifreeze is added to the concrete, and 3% to 8% of the cement mass is added according to different temperatures. When the temperature is below minus ten degrees, it is still possible to use salt water or anti-icing cement.
C20 concrete antifreeze ratio?
C20 fine stone concrete floor refers to the concrete floor made of C20 concrete. C20 is the concrete strength grade. The first letter C in the English name of concrete is added to its compressive strength standard value to express the compressive strength standard value 20, which is 20MPa, which is N/mm^2. The design strength of concrete is C20. Because fine stones are added to the concrete, it is written as C20 fine stone concrete. C20 fine stone concrete mix ratio (mass) cement: sand: gravel: water: antifreeze=1:2.01:3.27:0.54::0.05
How long will the cement floor be afraid of freezing? Already?
1. It takes about seven days in ordinary areas and about 12 days in alpine areas before cement is not afraid of freezing. However, this time is not fixed. It is related to the type of cement, local environment and other factors. Generally, it only takes Concrete is not afraid of freezing when it reaches 30% of its design strength.
2. The cement is frozen. If the local temperature is too low, it will affect the hydration degree of the cement. When the water vapor inside the concrete is frozen, it will destroy its strength and affect the service life of the concrete. When we construct in winter, we must pay attention to the anti-freeze work of cement. For example, when we prepare cement mortar, we can add appropriate anti-freeze agent. When the temperature drops, plastic films, straw curtains, etc. can be laid on the surface to keep it warm.
What should I do if the anti-crack mortar in exterior wall insulation construction freezes?
An antifreeze early strength agent should be added to the mortar mixture, then stir with hot water, and then follow the principle of plastering with stirring. Do not store a large amount of stirred mortar.
This ensures the viscosity of the mortar, making it easier for construction workers to operate and preventing the mortar from being frozen and unusable.
It can also ensure that the strength of the mortar meets the requirements in a short time during the lamination process, so that the quality of exterior wall insulation construction reaches qualified standards. </p
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