Lightweight concrete

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:

• 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.

literature

• 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 .

Web links

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

• Leichtbeton.de

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: http://www.heidelbergcement.de/ . Retrieved January 21, 2018 . 
3. ↑ Infralight concrete |. Accessed March 2, 2019 (German).