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.
- 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:
- Structurally dense lightweight concrete (LBG) with grain porosity ( lightweight construction concrete)
- Heap porous lightweight concrete (LBH) with dense or porous aggregate
- Aerated concrete
- Foamed Concrete (pore lightweight concrete)
- Infralight 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.
- Verein Deutscher Zementwerke eV: Cement information sheet for concrete technology B13. Lightweight concrete 2014
- W. Scholz: Knowledge of building materials. 18., rework. and actual Edition. Werner Verlag, Neuwied 2016, ISBN 978-3-8462-0538-9 .
- G. Neroth: Wendehorst building materials science. Basics - building materials - surface protection. 27., completely revised. Edition. Vieweg + Teubner, Wiesbaden 2011, ISBN 978-3-8351-0225-5 .
- Beuth Verlag (Ed.): DIN 1045 - Structures made of concrete, reinforced concrete and prestressed concrete .
- The lightweight material for demanding structures. In: http://www.heidelbergcement.de/ . Retrieved January 21, 2018 .
- Infralight concrete |. Accessed March 2, 2019 (German).