3D printing magnesium phosphate cement concrete product and curing method thereof

Abstract

The invention discloses a 3D printing magnesium phosphate cement concrete product and a curing method thereof, the magnesium phosphate cement concrete product is prepared from the following raw materials in parts by weight: 100 parts of dead burned magnesium oxide, 80-110 parts of magnesium-based standard sand, 0-30 parts of water granulated slag sand, 0-40 parts of engineering residue soil, 90-120 parts of phosphate, 5-15 parts of an additive and 10-25 parts of dry ice, and the mass ratio of water to the total mass of dead burned magnesium oxide and phosphate is 3: 10. According to the invention, dry ice is added into the fresh mixed slurry of magnesium phosphate cement concrete, so that the carbonization degree and hydration degree of the fresh mixed slurry are improved, and the microstructure and mechanical properties of magnesium phosphate cement are improved; the setting time of the magnesium phosphate cement is prolonged, 3D printing of the magnesium phosphate cement is facilitated, and development of a magnesium phosphate cement product process is promoted; the water granulated slag sand and the engineering residue soil after steelmaking are directly added into the magnesium phosphate cement mortar to partially replace increasingly exhausted natural sand, so that not only is a large number of natural resources saved in an environment-friendly manner, but also obvious economic benefits are created.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a 3D printed magnesium phosphate cement concrete product and a maintenance method thereof. Background technique [0002] Magnesium phosphate cement (Magnesium phosphate cement, MPC) is a chemically bonded ceramic material. Magnesium phosphate cement emits a lot of heat during the hydration process, and magnesium hydroxide, one of the hydration products, undergoes carbonization reactions with carbon dioxide in the air; Cooling equipment is used for cooling treatment, but the freshly mixed slurry of magnesium phosphate cement needs to be mixed with water and poured, and the commonly used cooling equipment is difficult to meet the requirements; when using low temperature measures below freezing point to modify magnesium phosphate cement, it is usually necessary to purchase Refrigeration equipment is used to create a low temperature environment below freezing point. For ...

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Problems solved by technology

[0005] The invention provides a 3D printed magnesium phosphate cement concrete product and its maintenance method, which solves the problem of low overall carbonation degree of the current magnesium phosphate cement; lack of maintenance methods below freezing point, sand fine aggregate participating in the reaction of magnesium phosphate cement; water slag sand, engineering slag Soil is difficult to efficiently use resources technical issues

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