The invention discloses low-thermal-
conductivity aerated concrete and a preparation method thereof, which belong to the technical field of material
science and engineering science and are used for solving the key technical problem of enhancement of extra light aerated concrete. The preparation method comprises the following steps of: stirring a compound
foaming agent component and a
silicate substrate
sizing agent according to a certain weight part ratio; molding; standing; performing
autoclave curing; and
cutting to obtain a hardened hydrated
silicate substrate, wherein the rubber hole ratioof the obtained hardened hydrated
silicate substrate is more than 0.95, the
porosity is less than 3 percent, the volume ratio of a
calcium hydrosilicate
crystal to
colloid is 1-2.5, self-heat-preserving performance and appropriate intensity of a product are realized, and when the
thermal conductivity coefficient is less than 0.06 W / (m.K) and the absolute dry
volume density is less than 250 kg / m<3>, the
compressive strength of the aerated concrete is still higher than 2Mpa. The low-thermal-
conductivity aerated concrete can be applied to self-heat-preserving wall bodies with the energy saving rates of more than 70 percent, fire-proof isolation belts for outer heat-preserving systems of
polystyrene plate thin plastered outer walls, treatment of wall body heat bridge positions,
shear wall heat-preserving systems and roof heat preserving.