How often do you have to work with concrete in water or on wet ground? Ordinary citizens are rarely faced with such tasks. Exceptions are the construction of wells, construction in areas with high ground level, construction of bridges near water bodies, etc. At the same time, there are also smaller situations when you may need miracle concrete. However, due to their rarity, knowledge about its creation is not very common among the owners. From this, at a crucial moment, it becomes excruciatingly painful. Let's fix this unpleasant situation.
So, it should be understood that concrete sloughing in water occurs due to the fact that sand separates from cement, which is the main bonding element. In order to prevent this from happening, it is required to accelerate the chemical reaction leading to the crystallization of cement. To make this possible, it is quite enough to purchase and use a special alumina cement.
What's the catch? The fact is that this material is not very common on the market for individual clients. This is because its cost is about 4-5 times higher than the cost of conventional cement and it is used only for very specific operations. Nevertheless, it is the use of HZ in the construction of complex objects near water that saves time and nerves. Within 12-15 hours after construction, the structure will be ready for use.
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Alumina cement-based concrete begins to harden in about 30 minutes. It is important to observe the required temperature parameters. They work with HZ only when the air is 15-20 degrees Celsius. In addition to water resistance, this material demonstrates better resistance to chemical attack and fire. When mixing the material, use 0.4 liters of water per 1 kg of cement. From 300-350 kg of HZ, about 1 cubic meter of concrete is obtained.
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If you want to know even more interesting things, then you should read about why sheathe the house with this material - not the best idea.
A source: https://novate.ru/blogs/250320/53908/