A double network reinforced composite quick-drying gel cement material and its preparation method

Abstract

The invention provides a dual-network reinforced composite quick-drying gel cement material and a preparation method thereof. The material comprises the following components in parts by weight: 30-40parts of polyhydroxyethyl methacrylate; 35-48 parts of a carbon fiber-organic-inorganic double-network polymer; 15-20 parts of plant fiber; 10-20 parts of bentonite nanoparticles; 10-20 parts of a surfactant; 10-20 parts of graphene; 10-20 parts of hexagonal boron nitride; 2-5 parts of boric acid; 10-15 parts of tricalcium phosphate; 5-10 parts of a redox system initiator; 4-8 parts of a crosslinking agent; and 3-5 parts of a polycarboxylate superplasticizer. The carbon fiber-organic-inorganic double-network polymer produced by using industrial production waste is adapted to graft the plant fiber, and a good graft copolymerization effect with polyhydroxyethyl methacrylate is achieved, the flexural strength and ductility of the synthesized cement material are enhanced, and addition of graphene can make a cement system form a self-monitoring system that monitors various parameters of concrete.

Description

technical field [0001] The invention relates to cement, which belongs to the technical field of building materials, in particular to a dual-network reinforced composite quick-drying gel cement material and a preparation method thereof. Background technique [0002] Cement concrete is one of the building materials widely used in the world today. However, some non-mechanical failures often occur in cement concrete structures before reaching the designed service life. Sulfate attack damage is one of the common non-mechanical damage forms of concrete. my country has a vast ocean area and a long coastline. The concentration of sulfate ions in seawater is about 2.54~3.06g / L, while the salt content in coastal saline soil is generally higher than 5%. Therefore, the cement concrete structure in the marine environment is During service, it will inevitably be corroded by sulfate in seawater[. For example, some marine projects, sea-crossing bridges, offshore oil production platforms, s...

AI Technical Summary

Problems solved by technology

Some concrete structures such as roads, bridges and tunnels, ground and underground buildings, underground pipelines, and utility poles and towers in the western region were severely damaged due to sulfate erosion after only a few years of use, and large-scale restoration work had to be carried out, consuming Huge maintenance costs resulting in huge economic losses

It can be seen that the problem of sulfate corrosion of concrete is a very prominent problem in my country, not only because of the high maintenance costs of damaged concrete structures, but also because of the lack of cement materials that are resistant to corrosion, high in bending resistance and not easy to break from the source.

[0004] Chinese patent 201710897493.7 discloses an environmentally friendly decorative cement. The technical solution uses: Portland cement, expansion agent, metakaolin, silica fume, whiskers, redispersible latex powder, water reducer, defoamer, fiber Materials such as plain ether, heavy calcium, and environmentally friendly materials are used to prepare cement. Although environmentally friendly materials are used, and they have workability and corrosion resistance, a large amount of water reducers, defoamers, and cellulose are used in the materials used. Auxiliary additives such as ether, which lead to large porosity of decorative cement, the corrosion resistance effect is not particularly good, and the environmental protection materials used cannot be well integrated with Portland cement clinker, which reduces the resistance of the finished cement material. Compressive strength and ductility, easy to break