How many colors does cement have?
Japanese researchers found that ordinary cement particles about 20 to 30 microns, was triangular or square shape. Into the grinding machine grinding can only increase the number of particles, can not change the shape, and sent to the high-speed air flow in the cement particles collide with each other, friction, you can wear off the edges and corrugated cement. Preparation of concrete with pellet cement, because the particles like the bearing as easy to rotate, increased mobility, not only save water, and the strength than the use of ordinary cement 30% to 50%.
A foreign reinforced concrete research institute invented a cheap and common shielding material - carbon cement. In order to make the cement conductive, in the cement added conductive properties of anthracite or coke powder. Building the building with this kind of cement makes the building itself a barrier and more secure and reliable than a metal barrier. When making conductive cement, pay attention to its high reflection coefficient, resulting in a high level of indoor electromagnetic energy. For the protection of staff and sensitive equipment, the Russian Institute of Concrete and Reinforced Concrete Science has also found a more ideal conductive cement, both a good absorption of electromagnetic radiation, but also has a very low reflection coefficient. The success of its development can reduce the cost of electromagnetic protection to the original 1%. Conductive cement can be used not only to build new plants but also as protective coatings. As the conductive cement will heat when there is a current through, this heat is safe and does not cause burning, so it can be used to build heat exchangers, drying rooms, non-icing airport runways, sidewalks and stairs, Wall of the house.
This kind of cement, known as "Akafalite", was developed by Japan to prevent groundwater from the subway tunnel wall, incorporating bituminous emulsions into common cement and adding polymer for diapers to make. It is most suitable for masonry tunnel wall for reinforcement materials and waterproof material, after curing with human nail-like elasticity, not easy to produce cracks, but also in the water can not be deformed hardening, will not produce pollution of groundwater.
