A kind of preparation method of self-healing cement-based composite material
A technology for self-healing materials and composite materials, which is applied in the field of self-healing cement-based composite materials, can solve problems such as adverse effects on mechanical properties and durability of concrete materials, and achieve the effect of promoting self-healing
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Embodiment 1
[0026] Synthesis of Nano-SiO by Sol-Gel Method under Alkaline Conditions 2 nanoparticles. Deionized water was used as the solvent and TEOS as the silica precursor. Add 20mlTEOS and mix with 100ml deionized water, stir in a water bath at 35°C, add NH 3 ·H 2 O, adjust the pH of the solution to 11, and stir the mixture for 24h to obtain nano-SiO 2 Granules 1.8g. 1.8g of nano-SiO 2 The particles were mixed with 45ml of GO slurry (solid content of 8g / L), added with 100ml of deionized water, ultrasonically dispersed and mixed for 2h, then the mixture was filtered, washed with deionized water, and dried to obtain SiO 2 -GO composites. SiO in composite powder materials 2 The mass ratio to GO is about 5:1.
[0027] 2.16g SiO 2 -GO, 18g fly ash, 2.52g alumite expansion agent, 8.64g slag powder and 1.08g water glass are fully mixed and stirred evenly, and placed on a disc granulator for granulation. 3.6 g of deionized water was sprayed in, and the prepared particles were cured ...
Embodiment 2
[0029] Synthesis of Nano-SiO by Sol-Gel Method under Alkaline Conditions 2 nanoparticles. Deionized water was used as the solvent and TEOS as the silica precursor. Add 40mLTEOS and mix with 100mL deionized water, stir in a water bath at 35°C, add NH 3 ·H 2 O, adjust the pH of the solution to 11, and stir the mixture for 24h to obtain nano-SiO 2 particles. Mix 3.6g nano-SiO2 particles with 50mL GO slurry (solid content 8g / L), add 100mL deionized water, ultrasonically disperse and mix for 2h, then filter the mixture, wash with deionized water, and dry to obtain SiO 2 -GO composite material, SiO in composite powder material 2 The mass ratio to GO is about 9:1.
[0030] 4gSiO 2 -GO, 37.6g metakaolin, 4g MgO expansion agent, 24g silica fume and 2.4g CaO were fully mixed and stirred evenly, and placed on a disc granulator for granulation. The prepared particles were cured under standard curing conditions for 3d to obtain self-healing material particles. Weigh 36g of self-he...
Embodiment 3
[0033] 18g of fly ash, 2.52g of alumite expansion agent, 10.8g of silica fume and 1.08g of water glass are fully mixed and stirred evenly, and placed on a disc granulator for granulation. 3.6g of deionized water was used, and the prepared particles were cured for 3 days under standard curing conditions to obtain self-healing material particles. Weigh 22.5g of self-healing material, 450g of PO42.5 cement and 225g of water, fully stir in a cement mortar mixer to form a cement slurry, add 1350g of standard sand, continue to fully stir, and pour the obtained cement mortar mixture into a mold to form , under the standard curing conditions, curing for 1d to remove the mold, and continue curing to the specified age.
[0034]The 3d and 28d flexural and compressive strengths of the self-healing cement mortar specimens were tested respectively. After curing the obtained mortar specimens for 28d, a precompression test was performed. The precompression was 60% of the 28d compressive stren...
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