High-toughness inorganic material/polymer composite concrete and preparation method thereof

Abstract

The invention discloses high-toughness inorganic material / polymer composite concrete and a preparation method thereof. The preparation method of the high-toughness inorganic material / polymer composite concrete comprises the following steps: modifying carbon nanometer tubes through a chemical reaction to obtain modified carbon nanometer tubes of which the surface is chemically grafted with high-substituted hydroxyproxyl cellulose, adding the modified carbon nanometer tubes in polyacrylate emulsion and stirring and mixing with water, a polyacrylate toughening emulsion, concrete, gravel, a fine aggregate, slag powder, fly ash and a water reducer as raw materials, thus obtaining the high-toughness inorganic material / polymer composite concrete. Through detection, the high-toughness concrete provided by the invention can show the significant strain hardening or deformation hardening characteristics under the action of a direct tensile load or a bending load, the bending strength can reach 19-29MPa, the tensile strength can reach 8-16MPa and the compressive strength can reach 78-95MPa. The high-toughness inorganic material / polymer composite concrete can be applied to fields such as bridge floor of large-span cross-sea / cross-river bridges, high-speed rail overhead viaducts and arch walls of various tunnels such as subway.

Description

technical field

[0001] The invention belongs to the field of building materials, and in particular relates to an inorganic material / polymer composite high-toughness concrete and a preparation method thereof. Background technique

[0002] The shortcomings of traditional concrete, such as low flexural strength and high brittleness, make it prone to cracks or even fractures during use, which seriously affects the overall safety and service life of buildings. Especially for building structures and parts such as bridge decks of long-span bridges and high-speed railway viaducts, as well as various types of tunnel arch walls, due to the complex and harsh stress environment, high-toughness concrete materials with as high as possible flexural strength must be used. In order to improve the toughness of concrete, steel bars were adopted earlier and have been used in large quantities till now. After that, various fiber materials with better mechanical properties and toughening effects,...

Examples

preparation example Construction

[0066] The preparation method of modified carbon nanotube comprises the following steps:

[0067] 1) Add 1,830 g of carbon nanotubes to a mixed acid consisting of 9 L of concentrated sulfuric acid and 6 L of concentrated nitric acid, ultrasonicate for 24 h, then heat and reflux for 48 h, wash the carbon nanotubes with water after centrifugation, and dry them under vacuum at 65 °C for 24 h. h, obtaining 1800 g of carbon nanotubes with carboxyl functional groups on the surface;

[0068] 2) Add 1800 g of the above-mentioned carbon nanotubes containing carboxyl functional groups on the surface to 15 L of thionyl chloride, stir at 30 °C for 3 h, then raise the temperature to 80 °C and reflux for 24 h, then distill off the thionyl chloride under reduced pressure, The carbon nanotubes washed with anhydrous acetone were vacuum-dried at room temperature for 24 h to obtain 1765 g of carbon nanotubes containing acid chloride groups on the surface;

[0069] 3) Add 1765 g of carbon nanotu...

Embodiment 1

[0073] 1. containing the polyacrylate emulsion of modified carbon nanotube, its preparation method comprises the steps:

[0074] 1) Mix OP-10 and sodium dodecylbenzenesulfonate at a mass ratio of 1:2 to prepare a compound emulsifier;

[0075] 2) At 20°C, mix 2.5 kg methyl methacrylate, 2 kg hydroxyethyl acrylate, 1.5 kg hydroxyethyl methacrylate, 1.5 kg methoxyethyl acrylate, and 0.8 kg acrylic acid as monomers, and then Add 0.03 kg of dodecyl mercaptan to 14 kg of water, mix and prepare monomer aqueous solution;

[0076] 3) Using potassium persulfate as the initiator, add 66.4 g of potassium persulfate to 2 kg of water, stir at room temperature until completely dissolved, and obtain an aqueous initiator solution;

[0077] 4) At 20°C, add 0.5 kg of modified carbon nanotubes and 249 g of composite emulsifier to 2 / 3 of the monomer aqueous solution, stir for 5 hours, add half of the initiator aqueous solution, and heat up within 1 hour while stirring to 70°C, and continue stirr...

Embodiment 2

[0114] 1. containing the polyacrylate emulsion of modified carbon nanotube, its preparation method comprises the steps:

[0115] 1) Mix OP-10 and sodium dodecylbenzenesulfonate at a mass ratio of 1:2 to prepare a compound emulsifier;

[0116] 2) At 22°C, mix 2 kg of methyl methacrylate, 1.5 kg of hydroxyethyl acrylate, 1 kg of hydroxyethyl methacrylate, 1 kg of methoxyethyl acrylate, and 0.5 kg of acrylic acid as monomers, and then Add 0.02 kg of dodecyl mercaptan to 13 kg of water, mix and prepare monomer aqueous solution;

[0117] 3) Using potassium persulfate as an initiator, add 48 g of potassium persulfate to 2 kg of water, stir at room temperature until completely dissolved, and obtain an aqueous initiator solution;

[0118] 4) At 22°C, add 0.3 kg of modified carbon nanotubes and 180 g of composite emulsifier to 2 / 3 of the monomer aqueous solution, stir for 5 hours, then add half of the initiator aqueous solution, and heat up within 1 hour while stirring to 72°C, and c...

technical field

[0001] The invention belongs to the field of building materials, and in particular relates to an inorganic material / polymer composite high-toughness concrete and a preparation method thereof. Background technique

[0002] The shortcomings of traditional concrete, such as low flexural strength and high brittleness, make it prone to cracks or even fractures during use, which seriously affects the overall safety and service life of buildings. Especially for building structures and parts such as bridge decks of long-span bridges and high-speed railway viaducts, as well as various types of tunnel arch walls, due to the complex and harsh stress environment, high-toughness concrete materials with as high as possible flexural strength must be used. In order to improve the toughness of concrete, steel bars were adopted earlier and have been used in large quantities till now. After that, various fiber materials with better mechanical properties and toughening effects,...

Examples

preparation example Construction

[0066] The preparation method of modified carbon nanotube comprises the following steps:

[0067] 1) Add 1,830 g of carbon nanotubes to a mixed acid consisting of 9 L of concentrated sulfuric acid and 6 L of concentrated nitric acid, ultrasonicate for 24 h, then heat and reflux for 48 h, wash the carbon nanotubes with water after centrifugation, and dry them under vacuum at 65 °C for 24 h. h, obtaining 1800 g of carbon nanotubes with carboxyl functional groups on the surface;

[0068] 2) Add 1800 g of the above-mentioned carbon nanotubes containing carboxyl functional groups on the surface to 15 L of thionyl chloride, stir at 30 °C for 3 h, then raise the temperature to 80 °C and reflux for 24 h, then distill off the thionyl chloride under reduced pressure, The carbon nanotubes washed with anhydrous acetone were vacuum-dried at room temperature for 24 h to obtain 1765 g of carbon nanotubes containing acid chloride groups on the surface;

[0069] 3) Add 1765 g of carbon nanotu...

Embodiment 1

[0073] 1. containing the polyacrylate emulsion of modified carbon nanotube, its preparation method comprises the steps:

[0074] 1) Mix OP-10 and sodium dodecylbenzenesulfonate at a mass ratio of 1:2 to prepare a compound emulsifier;

[0075] 2) At 20°C, mix 2.5 kg methyl methacrylate, 2 kg hydroxyethyl acrylate, 1.5 kg hydroxyethyl methacrylate, 1.5 kg methoxyethyl acrylate, and 0.8 kg acrylic acid as monomers, and then Add 0.03 kg of dodecyl mercaptan to 14 kg of water, mix and prepare monomer aqueous solution;

[0076] 3) Using potassium persulfate as the initiator, add 66.4 g of potassium persulfate to 2 kg of water, stir at room temperature until completely dissolved, and obtain an aqueous initiator solution;

[0077] 4) At 20°C, add 0.5 kg of modified carbon nanotubes and 249 g of composite emulsifier to 2 / 3 of the monomer aqueous solution, stir for 5 hours, add half of the initiator aqueous solution, and heat up within 1 hour while stirring to 70°C, and continue stirr...

Embodiment 2

[0114] 1. containing the polyacrylate emulsion of modified carbon nanotube, its preparation method comprises the steps:

[0115] 1) Mix OP-10 and sodium dodecylbenzenesulfonate at a mass ratio of 1:2 to prepare a compound emulsifier;

[0116] 2) At 22°C, mix 2 kg of methyl methacrylate, 1.5 kg of hydroxyethyl acrylate, 1 kg of hydroxyethyl methacrylate, 1 kg of methoxyethyl acrylate, and 0.5 kg of acrylic acid as monomers, and then Add 0.02 kg of dodecyl mercaptan to 13 kg of water, mix and prepare monomer aqueous solution;

[0117] 3) Using potassium persulfate as an initiator, add 48 g of potassium persulfate to 2 kg of water, stir at room temperature until completely dissolved, and obtain an aqueous initiator solution;

[0118] 4) At 22°C, add 0.3 kg of modified carbon nanotubes and 180 g of composite emulsifier to 2 / 3 of the monomer aqueous solution, stir for 5 hours, then add half of the initiator aqueous solution, and heat up within 1 hour while stirring to 72°C, and c...