Method for internal and external collaborative integrated protection of concrete

A method for internal and external collaborative integrated protection of concrete, comprising the following steps:

• SI. an internal protection process that comprises providing a method for enhancing compactness of cement concrete by reinforcement, which comprises:
• SI-1:
• carrying out surface treatment of reinforcement, wherein the reinforcement is carbon fibers, a surface treatment method for the reinforcement is as follows:
• SI-11:
• surface desizing of carbon fibers
• placing a beaker with carbon fibers and absolute ethyl alcohol in an ultrasonic cleaner, and keeping an ultrasonic treatment mode on for 60 min to achieve effective desizing of surfaces of the carbon fibers;
• taking out the carbon fibers, and ultrasonically treating the carbon fibers in deionized water for 30 min to completely remove residual absolute ethyl alcohol from the surfaces of the carbon fibers;
• placing a container with the carbon fibers in an oven, and setting a temperature to 60-80° C. for drying until the carbon fibers reach a constant weight state, to obtain desized carbon fibers;
• SI-12:
• heat treatment of carbon fibers
• spreading the desized carbon fibers in the container, placing the container in a muffle furnace, and setting a temperature of the muffle furnace to 100-500° C. to carry out heat treatment of the carbon fibers for 10-30 min to complete the surface treatment of the carbon fibers;
• SI-2:
• preparing cement gel, dissolving the reinforcement treated in step SI-1 into a solvent, adding the mixture to the cement gel for mixing, pouring the mixture into a mold for forming, and carrying out solidification, form removal and indoor curing to obtain a cement concrete specimen;
• Adding carboxymethyl cellulose to water until completely dissolved, wherein the mass ratio of the carboxymethyl cellulose to the water is 1:400, thereby obtaining a solvent.
• SII:
• an external protection process that comprises successively constructing dual rough structures at microscopic and nanoscopic levels on a surface of concrete through a super-hydrophobic anti-corrosive coating technology to form an efficient anti-corrosive coating, with a specific process as follows:
• SII-1:
• construction of microstructure
• SII-11:
• dissolving resin in anhydrous ethanol and a curing agent with a solvent, heating in a water bath, and conducting magnetic stirring to obtain a mixed solution, wherein the mass ratio of the resin to the curing agent is (9-12):1;
• SII-12:
• immersing a surface to be protected of the cement concrete specimen cured in step SI into the mixed solution for 2-3 s, and then taking out the surface;
• and repeating this step twice, i.e., immersing three times in total, to obtain a bonding layer on the surface to be protected of the cement concrete specimen;
• SII-13:
• uniformly dispersing particles on a surface of the bonding layer of the cement concrete specimen through a sieve to obtain a composite material with a microcosmic rough structure, and then carrying out solidification;
• SII-2:
• construction of nanostructure
• SII-21:
• dissolving resin in anhydrous ethanol, a curing agent, a hydrophobic modifier and nano particles with a solvent, heating in a water bath, and conducting magnetic stirring to form a uniform super-hydrophobic suspension;
• the mass ratio of the resin to the curing agent is (9-12):1;
• and the mass ratio of the curing agent to the hydrophobic modifier is 1:1;
• SII-22:
• immersing a surface to be protected of the cement concrete specimen solidified in step SII into the super-hydrophobic suspension for 2-3 s, taking out the surface, and then carrying out solidification for 1-1.5 h;
• SII-23:
• repeating the process of step SII-22 once;
• SII-24:
• immersing the surface to be protected of the cement concrete specimen solidified in step SII-23 into the super-hydrophobic suspension for 2-3 s, taking out the surface, and then carrying out solidification for 3-3.5 h to obtain a concrete structure with internal and external collaborative integrated protection.