3D printing thermal insulation concrete containing SiO2 aerogel and preparation method of 3D printing thermal insulation concrete

Abstract

The invention discloses 3D printing thermal insulation concrete containing SiO2 aerogel and a preparation method of the 3D printing thermal insulation concrete. The concrete comprises the following components: cement, silica fume, quartz sand, river sand, SiO2 aerogel, a water reducing agent, water and a hydrophilic surfactant. The hydrophobic aerogel is modified by using the hydrophilic surfactant to reduce the hydrophobicity of the aerogel, and the mixing amount of the hydrophobic aerogel in cement mortar is increased on the premise of not changing the properties of the aerogel; and meanwhile, the flowability of the concrete is ensured, so that the heat conductivity coefficient of the concrete is reduced, and the thermal insulation effect of the concrete is improved.

Description

technical field [0001] The invention relates to the field of 3D printing, specifically a SiO-containing 2 Airgel 3D printing insulation concrete and its preparation method. Background technique [0002] 3D printing technology can produce special-shaped objects according to the needs, making it widely used in medicine, machinery, and plastic industries. In recent years, 3D printing technology has begun to be applied to concrete. 3D printing concrete technology refers to the technology of using cement-based materials as printing materials according to the path formed by digital models, and finally forming three-dimensional structures or components through layer-by-layer stacking. 3D Printed concrete technology has become one of the research hotspots in the civil engineering industry. At present, public facilities such as houses, bridges, and bus stations have been successfully prepared using 3D printing concrete technology. 3D printing concrete is mostly a load-bearing mater...

AI Technical Summary

Problems solved by technology

Due to the extrusion characteristics of 3D printing technology and the superhydrophobic properties of airgel, the fluidity of concrete with high content of airgel is reduced, which cannot meet the printability. Difficult to exert its thermal insulation effect

[0004]In the prior art, most of the airgel is directly mixed into the concrete without modification, which limits the amount of airgel added to the concrete. So that the thermal conductivity of concrete can be reduced to a limited extent

After improvement, some 3D printed thermal insulation concrete reduces the thermal conductivity of concrete and improves the thermal insulation performance of printed concrete by foaming concrete or adding polystyrene particles to the concrete, but the foaming process is complicated, the concrete strength is low, and polystyrene is mixed. The flammability and poor fire resistance of granular concrete

After that, the researchers used modifiers (such as methanol, silane coupling agent, N-hexylamine, and acetonitrile) to modify the airgel to make it better mixed with mortar concrete, but the airgel modification process There are problems such as complex process, long time-consuming, changing the original properties of airgel, and reduced fluidity of concrete after doping. At the same time, only the modified airgel is applied to normal pouring concrete, and the air The 3D printing process of gel concrete has not been studied

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