Lightweight concretes are concretes with a bulk density of between 800 and 2000 kg/m³. "Normal" concrete has a bulk density of 2000 to 2600 kg/m³. Infra-lightweight concrete has a bulk density of approx. 350kg/m³. This is currently the technical lower limit.
Lightweight aggregates are used to produce lightweight concrete. These have a high porosity, i.e. a high proportion of the finest air pores in each grain. The proportion of air voids is approx. 85% by volume. This reduces weight and reduces thermal conductivity, as air is a poor conductor of heat.
Possible aggregates are:
These aggregates can also be mixed with each other.
a low weight or good thermal insulation values are required for concrete components, lightweight concrete is used. As a lightweight structural concrete, it enables wide-spanning constructions, as it reduces the dead weight of slabs and bridges.
Monolithic exterior walls can be erected with lightweight concrete masonry that meet all requirements for load-bearing capacity and thermal insulation.
Lightweight concrete is available in compressive strength classes LC 8/9 to LC80/88. It is particularly suitable for:
in residential, agricultural, public or industrial buildings,
among others.Lightweight concrete is
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