Ceramic particles are lightweight aggregates produced through foaming in rotary kilns. It has a spherical shape, a smooth and hard surface, and a honeycomb like interior, characterized by low density, low thermal conductivity, and high strength. In the refractory material industry, ceramic particles are mainly used as aggregates for thermal insulation refractory materials.
The stacking density of ceramic particles is less than 1100kg/m3, generally ranging from 300-900kg/m3. The density of concrete made with ceramic particles as aggregate is 1100-1800kg/m3, and the corresponding compressive strength of concrete is 30.5-40.0Mpa. The characteristic of ceramic particles is that they have a hard surface and numerous micropores inside. These micropores endow the ceramic particles with the characteristic of being lightweight. The density of No. 200 fly ash ceramic aggregate concrete is about 1600kg/m3. At present, ceramic sand is mainly used as a petroleum proppant in China and is also one of the high demand ceramic sand varieties, also known as petroleum fracturing proppant ceramic sand.
The reason why ceramic particles have developed rapidly worldwide is because they have many excellent properties that other materials do not possess, which gives them a role that cannot be replaced by other materials. These excellent performances have the following aspects.
1, Thermal insulation: The ceramic particles provided by ceramic particles have good thermal insulation properties due to their porous interior. The thermal conductivity of concrete prepared with them is generally 0.3-0.8W/(m · k), which is 1-2 times lower than that of ordinary concrete. So, ceramic buildings have a good thermal environment.
2, Excellent fire resistance: Ordinary fly ash ceramic aggregate concrete or fly ash ceramic aggregate blocks combine insulation, earthquake resistance, frost resistance, fire resistance and other properties, especially the fire resistance is more than four times that of ordinary concrete. For the same fire resistance period, the thickness of the ceramic aggregate concrete board is 20% thinner than that of ordinary concrete. In addition, fly ash ceramic particles can also be used to prepare refractory concrete with a fire resistance below 1200 ℃. At a high temperature of 650 ℃, ceramic aggregate concrete can maintain 85% of its strength at room temperature. Ordinary concrete can only maintain 35% to 75% of its strength at room temperature.