Lightweight concrete

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Test of lightweight concrete blocks made from power plant ash in Riesa, 1975
Lightweight concrete made of polystyrene beads after filling on the raw concrete floor (bottle opener serves as a reference size)

Lightweight concrete is a concrete with a dry bulk density (volume weight) between 800 and 2000 kg / m³. The technical lower limit of the density of lightweight concrete is currently around 350 kg / m³.

The admixture of aggregates with high porosity or low density is responsible for the low density. Each grain has a high proportion of up to 85% by volume of the finest air pores. These air pores give the lightweight concrete thermal insulation properties (lower thermal conductivity ). The most commonly used light aggregates are expanded clay , expanded glass (recycled, burnt glass), expanded slate or pumice stone . These can also be mixed together.

Application area

  • Walls, basements, ceilings and other structural elements
  • Slimmer load-bearing components due to their low weight
  • Bridge girders and beams

Various lightweight concretes

A distinction is made between different lightweight concrete:

Bricks made of lightweight concrete are manufactured as solid bricks (DIN V 18152-100), solid blocks (DIN V 18152-100) and hollow blocks (DIN V 18151-100). Special block and structural elements (reinforced and unreinforced) with separate approval notices are also manufactured.


Web links

Wiktionary: lightweight concrete  - explanations of meanings, word origins, synonyms, translations

Individual evidence

  1. Beuth Verlag (Ed.): DIN 1045 - Structures made of concrete, reinforced concrete and prestressed concrete .
  2. The lightweight material for demanding structures. In: . Retrieved January 21, 2018 .
  3. Infralight concrete |. Accessed March 2, 2019 (German).