3D printing magnesium oxychloride cement concrete product and maintenance method thereof

Abstract

The invention discloses a 3D printing magnesium oxychloride cement concrete product and a maintenance method thereof. The magnesium oxychloride cement concrete product comprises the following raw materials in parts by weight: 100 parts of light calcined magnesia, 100-150 parts of magnesium-based standard sand, 0-70 parts of water granulated slag sand, 130-200 parts of magnesium chloride hexahydrate, 0-40 parts of engineering residue soil, 0.5-10 parts of an additive, 10-30 parts of dry ice and 30-60 parts of water. According to the method, the dry ice is added into the magnesium oxychloride cement mortar additive newly-mixed slurry, the temperature of the newly-mixed slurry before final setting of magnesium oxychloride cement is reduced at low cost, carbon dioxide gas is conveniently introduced into the magnesium oxychloride cement newly-mixed slurry, magnesium hydroxide generated by reaction is fully carbonized, and the carbonization degree of the magnesium oxychloride cement newly-mixed slurry is remarkably improved; and the water granulated slag sand and the engineering residue soil generated by steelmaking are directly added into a magnesium oxychloride cement concrete product, resource utilization is achieved, the magnesium oxychloride cement mortar additive is used for 3D printing, and engineering application of magnesium oxychloride cement is promoted.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a 3D printed magnesium oxychloride cement concrete product and a maintenance method thereof. Background technique [0002] Magnesium oxychloride cement is a low-energy, low-carbon green cement with good development prospects. Magnesium oxychloride cement emits a lot of heat during the hydration process, and cooling equipment is usually used for cooling treatment. However, the freshly mixed slurry of magnesium oxychloride cement needs to be mixed with water and poured after stirring. The commonly used cooling equipment is difficult to meet the requirements, resulting in Magnesium oxychloride cement concrete products have a low degree of carbonation; in addition, as a kind of green cement, there are still few researches on its 3D printing, which seriously limits its industrial development and engineering application. In addition, the water slag sand in the steelmaking...

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Problems solved by technology

[0004] The invention provides a 3D printed magnesium oxychloride cement concrete product and its maintenance method, which solves the problem that the overall carbonization degree of the current magnesium oxychloride cement is low; there is a lack of fine sand aggregates participating in the reaction of magnesium oxychloride cement; water slag sand and engineering slag are difficult Efficient Resource Utilization Technical Issues

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