Lightweight aggregate concrete, also known as lightweight concrete, refers to concrete with a dry apparent density of no more than 1950 kg/m ³ made by mixing lightweight coarse aggregate, ordinary sand, cement, and water.

　　Application field

In the field of building energy conservation, it is suitable for roof sloping, floor cushion, wall pouring, etc. It can reduce energy consumption and meet the requirements of green buildings.

In the field of prefabricated construction, its lightweight characteristics make the transportation and installation of components more convenient, which can improve the construction efficiency and quality of prefabricated buildings.

In the field of municipal engineering, it can be applied to road base, bridge structures and other parts, and its seismic durability can improve the service life of the project.

　　Misconceptions about purchasing: Avoid these "pitfalls"

The lower the density, the better

Although low density is "lighter", its strength and durability will decrease (such as insulation types with a density of ≤ 500kg/m ³, which may only have a strength of 2.0MPa and are easily damaged). It is necessary to balance "lightweight" and "performance" and not blindly pursue low density.

Only focus on strength, not elastic modulus ":

Structural lightweight aggregate concrete should pay attention to the "elastic modulus" (such as C30 structural type, the elastic modulus should be ≥ 2.0 × 10 ⁴ MPa). If the elastic modulus is too low, it will cause excessive deformation of the components (such as floor sagging), affecting the safety of use.

Believe in verbal promises, do not test reports

Some merchants may verbally promise to "meet strength standards" and "maintain good insulation", but there is no third-party report, which may lead to "insufficient strength" and "poor insulation effect" in the later stage, resulting in project rework; Paper testing reports (with CMA seal) must be required, and the report parameters must be consistent with the product identification.

Neglecting construction adaptability:

If the slope layer of the roof is poured on site, and the slump of the product is too small (<100mm), it will cause difficulty in pumping and insufficient compaction during vibration; If the setting time of concrete used for prefabricated components is too short (<4h), it will affect the formation of the components; It is necessary to confirm whether the "slump" and "setting time" are suitable according to the construction method (pouring/prefabrication).