Bi-component cement based composite material for 3D printing as well as preparation method and application thereof
A technology of 3D printing and composite materials, which is applied in the field of two-component cement-based composite materials for 3D printing and its supporting preparations. It can solve the problems of high construction organization requirements, short setting time, equipment damage, etc., and achieve slump Good retention, reduced sliding resistance, and improved fluidity
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Embodiment 1
[0095] 1. The weight percentage of each raw material of component A is as follows:
[0096] Sulphoaluminate cement 34%, S95 mineral powder 6%, tailings machine-made sand 44%, polymer 2.5%, polycarboxylate water reducer 0.15%, sodium tetraborate 0.2%, sodium gluconate 0.1% , 0.05% starch ether, 0.1% polypropylene fiber, 0.05% defoamer, 0.85% shrinkage reducing agent, and 12% mixing water.
[0097] Preparation of mixed component A: pre-mix the above powdered raw materials, add water and stir thoroughly.
[0098] Component A can be pre-mixed in the mixing station and loaded into the concrete mixer truck to be transported to the construction site for use, or it can be pumped into the construction 3D printer after being mixed on site. The amount of mixing can be controlled according to the printing speed. The specific steps are as follows:
[0099] Step 1. Prepare retarder: Weigh or measure sodium tetraborate, sodium gluconate and tartaric acid in proportion, mix them uniformly, a...
Embodiment 2
[0111] 1. The weight percentage of each raw material of component A is as follows:
[0112] Sulphoaluminate cement 36%, fly ash 4%, tailings machine-made sand 42%, polymer 3.0%, polycarboxylate superplasticizer 0.2%, sodium tetraborate 0.3%, sodium gluconate 0.1% , 0.2% starch ether, 0.1% polypropylene fiber, 1% shrinkage reducing agent, 0.1% defoamer, and 13% mixing water.
[0113] The specific preparation steps are the same as in Example 1.
[0114] 2. The weight percentage of each raw material of component B is as follows:
[0115] Lithium carbonate 2.5%, thixotropic agent 3.5%, defoamer 1%, mixing water 93%.
[0116] The specific preparation steps are the same as in Example 1.
[0117] 3. Preparation of two-component cement-based composite materials for 3D printing:
[0118] Pump the prepared A and B components into the two-component material construction 3D printer according to the mass ratio of A:B=15:1, and then extrude A+B cement-based composite 3D printing after m...
Embodiment 3
[0121] 1. The weight percentage of each raw material of component A is as follows:
[0122] 40% sulfoaluminate cement, 40% tailings machine-made sand, 3.0% polymer, 0.5% sulfamate superplasticizer, 0.6% sodium tetraborate, 0.35% sodium gluconate, 0.05% tartaric acid, Starch ether 0.5%, polypropylene fiber 0.2%, shrinkage reducing agent 1.3%, defoamer 0.1%, mixing water 13.4%.
[0123] The specific preparation steps are the same as in Example 1.
[0124] 2. The weight percentage of each raw material of component B is as follows:
[0125] Lithium carbonate 3%, thixotropic agent 4%, defoamer 1.5%, mixing water 91.5%.
[0126] The specific preparation steps are the same as in Example 1.
[0127] 3. Preparation of two-component cement-based composite materials for 3D printing:
[0128] Pump the prepared A and B components into the two-component material construction 3D printer according to the mass ratio of A:B=10:1, and then extrude A+B cement-based composite 3D printing after...
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