The application relates to a light-weight concrete insulation board and a preparation method thereof, and belongs to the technical field of
building insulation boards. The light-weight concrete insulation board is mainly prepared from the following components: cementing material 350-400 parts by weight, light-weight aggregate 71-81.5 parts by weight, additive 10-17.5 parts by weight,
foaming agent 1.5-2.0 parts by weight, reinforcing
fiber 0.8-1.2 parts by weight, silica
sol 2-3 parts by weight and water 160-200 parts by weight. The light-weight concrete insulation board provided by the application can significantly improve the insulation performance on the basis of guaranteeing mechanical properties such as
compressive strength, and can guarantee the anti-freezing performance of the insulation board under low-temperature conditions.