Controlled-release early-strength composite material, preparation method and application thereof in cement-based material
A technology of cement-based materials and composite materials, applied in the field of slow-release and early-strength composite materials, cement-based materials, application and preparation, can solve problems such as limited adaptability, large differences in cement components, and accelerated adsorption and wrapping, etc., to achieve Improves early strength without compromising durability and promotes formation
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Embodiment 1
[0060] First, 5.0 g of calcium nitrite was prepared into a 20 wt % calcium nitrite solution as an aqueous solution of inorganic salts.
[0061] Then, a flask containing 200 g of ethanol was placed in an ultrasonic water tank, the ultrasonic dispersion was turned on, and the calcium nitrite solution was added to the flask at a speed of 5 mL / h to 10 mL / h with a peristaltic pump, and the calcium nitrite particles were prepared by the anti-solvent method. .
[0062] In the third step, 1.0 g of ammonia water was added to the flask under ultrasonic stirring, 20.0 g of tetraethyl orthosilicate was added to the flask using a dropping funnel, and ultrasonically dispersed at 20°C to 30°C. Calcium nitrate particles are used as micelle growth points, and tetraethyl orthosilicate is hydrolyzed under the action of ammonia water, and undergoes a sol-gel reaction to generate porous nano-silica.
[0063] Finally, the reaction system obtained after the dropwise addition of tetraethyl orthosili...
Embodiment 2
[0066] First, 3.0 g of sodium nitrite and 4.0 g of calcium nitrate were respectively prepared into 20 wt% sodium nitrite solution and calcium nitrate solution, and the mixed solution of the two was used as an aqueous solution of inorganic salt.
[0067] Then, a flask containing 200 g of acetone was placed in an ultrasonic water tank, the ultrasonic dispersion was turned on, and the above-mentioned sodium nitrite solution and calcium nitrate solution were added to the flask at a speed of 5 mL / h to 10 mL / h with a peristaltic pump, and the anti-solvent method was used to prepare Sodium nitrite particles and calcium nitrate particles.
[0068]In the third step, 1.0g of ammonia water and 0.5g of diethanolamine were added to the flask under ultrasonic stirring, and 10.0g of tetraethyl orthosilicate and 15.0g of tetrabutyl titanate were added to the flask using a dropping funnel. Ultrasonic dispersion at 30°C, sodium nitrite particles and calcium nitrate particles are used as micelle...
Embodiment 3
[0072] First, 4.0g of sodium nitrite, 3.0g of magnesium nitrate, 2.0g of potassium sulfate and 1.0g of lithium sulfate were prepared into 20wt% sodium nitrite solution, magnesium nitrate solution, potassium sulfate solution and lithium sulfate solution, respectively. The mixed solution is used as an aqueous solution of inorganic salts.
[0073] Then, place the flask containing the mixed organic reagent of 100g ethanol, 50g acetone and 50g tetrahydrofuran in the ultrasonic water tank, open the ultrasonic dispersion, and add the aqueous solution of the above-mentioned inorganic salt to the flask at a speed of 5mL / h~10mL / h with a peristaltic pump , using the anti-solvent method to prepare sodium nitrite particles, magnesium nitrate particles, potassium sulfate particles and lithium sulfate particles.
[0074] In the third step, 1.0g of diethanolamine and 1.0g of triethanolamine were added to the flask under ultrasonic stirring, and 15.0g of methyl orthosilicate and 15.0g of butyl...
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