High-toughness concrete and preparation method thereof
A concrete and high-toughness technology, applied in the field of building materials, can solve the problems of loss of excellent performance, thermodynamic instability, high specific surface energy, etc., and achieve the effects of enhancing repulsion, improving overall mechanical properties, and simple operation
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[0042] Example 1
[0043] First, a modified graphene with a surface hydroxyl content of 0.008% is prepared, and the preparation specifically includes the following steps:
[0044] 1) At 0℃, add 2 kg of 200 mesh natural flake graphite to 20 L of concentrated sulfuric acid and stir for 2 hours; then slowly add 0.9 kg of potassium persulfate and 1 kg of phosphorus pentoxide, and stir at 20℃ for 4 hours. Warm up to 40℃ and stir for 24 hours; then slowly add 80 L of water and stir for 2 hours, then slowly add 3.6 L of 30% hydrogen peroxide to obtain a suspension of bright yellow particles; centrifuge the bright yellow particles and wash with water After cleaning, vacuum drying at 60°C for 12 h to obtain 1.86 kg of graphene oxide;
[0045] 2) Take 1.2 kg of graphene oxide, add it to 10 L thionyl chloride, reflux and stir at 80 ℃ for 24 h, then centrifuge, wash with acetone, and vacuum dry at room temperature for 12 h to obtain the surface containing acid chloride groups Of graphene 1.18 ...
Example Embodiment
[0074] Example 2
[0075] First, a modified graphene with a surface hydroxyl content of 0.012% is prepared, and the preparation specifically includes the following steps:
[0076] 1) At 1℃, add 2 kg of 200 mesh natural flake graphite to 20 L of concentrated sulfuric acid and stir for 2h; then slowly add 0.9 kg of potassium persulfate and 1 kg of phosphorus pentoxide, and stir at 20℃ for 4 hours. Warm up to 40℃ and stir for 24 hours; then slowly add 80 L of water and stir for 2 hours, then slowly add 3.6 L of 30% hydrogen peroxide to obtain a suspension of bright yellow particles; centrifuge the bright yellow particles and wash with water After cleaning, vacuum drying at 60°C for 12 h to obtain 1.86 kg of graphene oxide;
[0077] 2) Take 1.2 kg of graphene oxide, add it to 10 L thionyl chloride, reflux and stir at 80 ℃ for 24 h, then centrifuge, wash with acetone, and vacuum dry at room temperature for 12 h to obtain the surface containing acid chloride groups Of graphene 1.18 kg;
...
Example Embodiment
[0089] Example 3
[0090] First, a modified graphene with a surface hydroxyl content of 0.01% is prepared, and the preparation specifically includes the following steps:
[0091] 1) At 2°C, add 2 kg of 200-mesh natural flake graphite to 20 L of concentrated sulfuric acid and stir for 2 hours; then slowly add 0.9 kg of potassium persulfate and 1 kg of phosphorus pentoxide, and stir at 20°C for 4 hours. Warm up to 40℃ and stir for 24 hours; then slowly add 80 L of water and stir for 2 hours, then slowly add 3.6 L of 30% hydrogen peroxide to obtain a suspension of bright yellow particles; centrifuge the bright yellow particles and wash with water After cleaning, vacuum drying at 60°C for 12 h to obtain 1.86 kg of graphene oxide;
[0092] 2) Take 1.2 kg of graphene oxide, add it to 10 L thionyl chloride, reflux and stir at 80 ℃ for 24 h, then centrifuge, wash with acetone, and vacuum dry at room temperature for 12 h to obtain the surface containing acid chloride groups Of graphene 1.18...
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