Low-thermal-conductivity aerated concrete and preparation method thereof

Abstract

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.

Description

[0001] technical field [0002] The invention relates to a low thermal conductivity aerated concrete and a preparation method thereof, which belong to the technical field of material science and engineering science. Background technique [0003] With the strengthening of my country's environmental protection and the implementation of sustainable development strategies, people's awareness of environmental resource protection has gradually strengthened, and building energy conservation and environmental protection have received more and more attention. The development of new wall materials with non-clay as the main raw material and the active promotion of energy-saving buildings are effective ways to protect the cultivated land resource environment, improve building functions and living comfort, and promote the construction of a resource-saving society. [0004] Aerated concrete is a new type of wall building material. It has the characteristics of light weight, heat preserv...

AI Technical Summary

Problems solved by technology

At present, more mature industrial aerated concrete products have an absolute dry density of 400~600kg / m3, and a thermal conductivity of 0.09~0.15W / (m﹐K), which cannot meet the energy saving requirements of a single material. Further energy saving requirements of more than 65%

[0005]The resulting low thermal conductivity air-entrained concrete has an absolute dry density of 200~400 kg / m3 and a thermal conductivity of ≤0.08W / (m﹐K), although it meets the requirement of more than 65% energy saving of a single material, but the strength is as low as 1MPa, which is still insufficient for making concrete slabs and filling materials for some building structures.

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