With the development and progress of construction technology, ceramic aggregate concrete, as a lightweight aggregate concrete with thermal insulation performance, has gradually been widely used in engineering, and has been more widely used in exterior wall panels, fire exits, foundations and other parts of buildings.
Ceramic aggregate concrete has the characteristics of insulation, fire resistance, good impermeability, and light weight, but it is also affected by the special properties of the raw materials used. Compared with ordinary concrete, the production resistance of ceramic aggregate concrete is higher, and most commercial concrete enterprises have problems with material storage, production, and transportation, which affects the promotion of ceramic aggregate concrete as pre mixed concrete.
Transportation and pouring of ceramic aggregate concrete:
(1) Try to shorten the transportation distance as much as possible, the transportation distance should not exceed 20km, and the time from concrete mixing to on-site pouring should not exceed 1 hour. Measures should be taken to reduce slump loss and prevent segregation during transportation.
(2) The mixer truck should maintain a uniform speed of the tank during transportation, with a speed controlled between 3-4 revolutions per minute. After the truck arrives at the site, if the slump loss is significant, an appropriate amount of water reducing agent can be added for mixing before unloading to meet the workability requirements for construction, but water cannot be added.
(3) When pouring ceramic aggregate concrete, the free falling height shall not exceed 1.5m. When the falling height is greater than 1.5m, auxiliary tools such as string barrels, chutes, or chutes shall be added. The mixture should be formed by mechanical vibration, and the vibration time should be based on the principles of compacting the mixture and avoiding the floating of ceramic particles.
(4) After pouring, the floating ceramic particles on the surface should be promptly pressed into the concrete using tools such as a clapper, scraper, or vibrating trowel. If the floating area of the particles is large, a surface vibrator can be used to re vibrate the mortar, allowing it to return to the slurry, and then proceed with plastering.
The poor workability of ceramic aggregate concrete is an important factor restricting its application. The main reason is that dry ceramic particles absorb water, resulting in a loss of slump in the concrete mixture. The greater the water absorption rate, the greater the loss of slump. Moreover, due to the significant density difference between ceramic particles and cement mortar, ceramic particle concrete is prone to layering and segregation during the mixing process. So ceramic aggregate concrete is prone to layering and loss of slump. In addition, under pressure, lightweight aggregates are prone to water absorption in concrete, and various factors can lead to pumping.
Compared with ordinary concrete, ceramic aggregate concrete has no significant difference in compressive strength and tensile strength, but its flexural strength and tensile strength are weaker, only about 75% of ordinary concrete. Therefore, when selecting concrete, consider its engineering characteristics, flexural strength, and tensile strength.
The above are some knowledge points about ceramic aggregate concrete. I hope everyone can study and understand the relevant knowledge seriously, choose products and equipment that are suitable for their needs, and ensure their own efficiency.