High-durability concrete and preparation process thereof

Abstract

The invention discloses high-durability concrete and a preparation process thereof, and the high-durability concrete comprises the following components in parts by mass: 80-100 parts of cement; 0.5 to 2 parts of nano titanium dioxide powder; 2 to 5 parts of super absorbent resin; 20 to 40 parts of a composite mineral admixture; 400 to 600 parts of coarse aggregate; 200 to 300 parts of fine aggregate; 50 to 60 parts of water; 1-3 parts of a carbon fiber reinforcement; a proper amount of an additive; according to the invention, innovative components such as nano titanium dioxide, super absorbent resin, composite mineral admixture and carbon fiber reinforcement are added, so that the impermeability, freezing resistance, chemical erosion resistance and crack resistance of the concrete are remarkably improved; the composite mineral admixture and the admixture are reasonably used, so that the cement consumption and the production cost are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials, and specifically relates to a high-durability concrete and its preparation process. Background Art

[0002] With the rapid development of the construction industry, the requirements for the durability of concrete materials are increasing day by day. Traditional concrete is prone to problems such as cracking and corrosion in harsh environments, resulting in a decline in structural performance and a shortening of service life. Therefore, developing a concrete with high durability is of great significance for improving the quality and safety of construction projects.

[0003] Based on this, a high-durability concrete and its preparation process are designed. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a high-durability concrete and its preparation process, effectively solving the problems raised in the above background.

[0005] To achieve the above object, the present invention provides the following technical solution: A high-durability concrete, comprising the following components in parts by mass:

[0006] Cement: 80 - 100 parts;

[0007] Nano-titanium dioxide powder: 0.5 - 2 parts;

[0008] Superabsorbent resin: 2 - 5 parts;

[0009] Composite mineral admixture: 20 - 40 parts;

[0010] Coarse aggregate: 400 - 600 parts;

[0011] Fine aggregate: 200 - 300 parts;

[0012] Water: 50 - 60 parts;

[0013] Carbon fiber reinforcement: 1 - 3 parts;

[0014] Admixture: appropriate amount.

[0015] Preferably, the cement is P.O 42.5 grade cement.

[0016] Preferably, the particle size of the nano-titanium dioxide powder is less than 100 nm.

[0017] Preferably, the superabsorbent resin is a polyacrylate-based superabsorbent resin.

[0018] Preferably, the composite mineral admixture is fly ash: slag powder: silica fume = 1:1:1, and the three are uniformly mixed in proportion to form the composite mineral admixture.

[0019] Preferably, the coarse aggregate is one of crushed stone or pebble, and the particle size is 5 - 31.5 mm.

[0020] Preferably, the fine aggregate is one of natural sand or artificial sand, and the fineness modulus is 2.3 - 3.0.

[0021] Preferably, the carbon fiber reinforcement is chopped carbon fiber with a length of 6 - 12 mm.

[0022] A preparation process of high - durability concrete includes the following steps:

[0023] S1. Raw material preparation

[0024] S1.1. Weigh each raw material component according to the above mass parts;

[0025] S2. Mixing and stirring

[0026] S2.1. Premixing: Put cement, nano - titanium dioxide powder, superabsorbent resin and composite mineral admixture into a mixer, and dry - mix at a speed of 500 - 800 r / min for 2 - 3 minutes to make the raw materials preliminarily mixed evenly;

[0027] S2.2. Adding water and stirring: Add water and admixture to the mixer, and continue to stir at a speed of 800 - 1200 r / min for 3 - 5 minutes to form a uniform concrete mixture;

[0028] S2.3. Adding carbon fiber: When the stirring is about to end, slowly add the carbon fiber reinforcement and continue to stir for 1 - 2 minutes to ensure that the carbon fiber is evenly distributed in the concrete;

[0029] S3. Pouring and curing

[0030] S3.1. Pouring: Pour the stirred concrete mixture into a mold, and vibrate it fully with a vibrating rod to remove air bubbles and ensure the compactness of the concrete;

[0031] S3.2. Curing: After pouring, cover and cure the concrete to keep the surface of the concrete moist.

[0032] Preferably, in S3.2, the curing temperature is 15 - 25 °C, and the curing time is not less than 28 days.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] The present invention innovatively adds nano-titanium dioxide, superabsorbent resin, composite mineral admixture, and carbon fiber reinforcement. As a photocatalyst, nano-titanium dioxide can effectively decompose organic pollutants on the concrete surface, improve the self-cleaning ability of the concrete, and enhance the anti-ultraviolet performance at the same time. The superabsorbent resin can absorb and lock the moisture inside the concrete, reduce moisture migration, and thus reduce the damage of freeze-thaw cycles to the concrete. The composite mineral admixture is composed of fly ash, slag powder, and silica fume in a specific proportion, which not only improves the density and strength of the concrete but also significantly enhances its chemical corrosion resistance. The carbon fiber reinforcement is evenly distributed in the concrete to form a three-dimensional network structure, effectively inhibiting the expansion of microcracks and improving the toughness and crack resistance of the concrete. Therefore, the impermeability, frost resistance, chemical corrosion resistance, and crack resistance of the concrete are significantly improved.

[0035] By reasonably using composite mineral admixtures and admixtures, the present invention reduces the cement consumption and production cost. Specific embodiments

[0036] The following will clearly and completely describe the technical solutions of the present invention in combination with specific embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0037] The present invention provides a high-durability concrete, which includes the following components in parts by mass:

[0038] Cement: 80 - 100 parts;

[0039] Nano-titanium dioxide powder: 0.5 - 2 parts; As a photocatalyst, it can effectively decompose organic pollutants on the concrete surface, improve the self-cleaning ability of the concrete, and enhance the anti-ultraviolet performance at the same time.

[0040] Superabsorbent resin: 2 - 5 parts; It can absorb and lock the moisture inside the concrete, reduce moisture migration, and thus reduce the damage of freeze-thaw cycles to the concrete.

[0041] Composite mineral admixture: 20 - 40 parts; It is composed of fly ash, slag powder, and silica fume in a specific proportion, which not only improves the density and strength of the concrete but also significantly enhances its chemical corrosion resistance.

[0042] Coarse aggregate: 400 - 600 parts;

[0043] Fine aggregate: 200 - 300 parts;

[0044] Water: 50 - 60 parts;

[0045] Carbon fiber reinforcement: 1-3 parts; evenly distributed in the concrete to form a three-dimensional network structure, effectively inhibiting the expansion of microcracks and improving the toughness and crack resistance of the concrete;

[0046] Admixture: appropriate amount.

[0047] The cement in this example is P.O 42.5 grade cement.

[0048] The particle size of the nano-titanium dioxide powder in this example is less than 100nm.

[0049] The superabsorbent resin in this example is a polyacrylate superabsorbent resin.

[0050] The composite mineral admixture in this example is fly ash: slag powder: silica fume = 1:1:1. The three are mixed evenly in proportion to form a composite mineral admixture.

[0051] The coarse aggregate in this example is one of crushed stone or pebbles, with a particle size of 5-31.5mm.

[0052] The fine aggregate in this example is one of natural sand or artificial sand, with a fineness modulus of 2.3-3.0.

[0053] The carbon fiber reinforcement in this example is chopped carbon fiber, with a length of 6-12mm.

[0054] A preparation process for a highly durable concrete, comprising the following steps:

[0055] S1. Raw material preparation

[0056] S1.1. Weigh each raw material component according to the above mass parts;

[0057] S2. Mixing and stirring

[0058] S2.1. Premixing: Put the cement, nano-titanium dioxide powder, superabsorbent resin and composite mineral admixture into a mixer and dry mix at a speed of 500-800r / min for 2-3 minutes to preliminarily mix the raw materials evenly;

[0059] S2.2. Adding water and stirring: Add water and admixture to the mixer and continue to stir at a speed of 800-1200r / min for 3-5 minutes to form a uniform concrete mixture;

[0060] S2.3. Adding carbon fiber: When the stirring is about to end, slowly add the carbon fiber reinforcement and continue to stir for 1-2 minutes to ensure that the carbon fiber is evenly distributed in the concrete;

[0061] S3. Pouring and curing

[0062] S3.1. Pouring: Pour the well-stirred concrete mixture into the mold, and use a vibrating rod to vibrate it thoroughly to remove air bubbles and ensure the compaction of the concrete.

[0063] S3.2. Curing: After pouring, cover and cure the concrete to keep the surface of the concrete moist.

[0064] In S3.2 of this embodiment, the curing temperature is 15 - 25 °C, and the curing time is not less than 28 days.

[0065] Example 1:

[0066] A high-durability concrete includes the following components in parts by mass:

[0067] Cement: 80 parts;

[0068] Nano-titanium dioxide powder: 0.5 part;

[0069] Superabsorbent resin: 2 parts;

[0070] Composite mineral admixture: 20 parts;

[0071] Coarse aggregate: 400 parts;

[0072] Fine aggregate: 200 parts;

[0073] Water: 50 parts;

[0074] Carbon fiber reinforcement: 1 part;

[0075] Admixture: appropriate amount.

[0076] The cement in this embodiment is P.O 42.5 grade cement.

[0077] The particle size of the nano-titanium dioxide powder in this embodiment is less than 100 nm.

[0078] The superabsorbent resin in this embodiment is polyacrylate superabsorbent resin.

[0079] The composite mineral admixture in this embodiment is fly ash: slag powder: silica fume = 1:1:1, and the three are mixed evenly in proportion to form a composite mineral admixture.

[0080] The coarse aggregate in this embodiment is one of crushed stone or pebble, and the particle size is 5 mm.

[0081] The fine aggregate in this embodiment is one of natural sand or artificial sand, and the fineness modulus is 2.3.

[0082] The carbon fiber reinforcement in this embodiment is chopped carbon fiber, and the length is 6 mm.

[0083] A preparation process of a high-durability concrete includes the following steps:

[0084] S1. Raw material preparation

[0085] S1.1. Weigh each raw material component according to the above mass parts;

[0086] S2. Mixing and stirring

[0087] S2.1. Premixing: Put cement, nano-titanium dioxide powder, superabsorbent resin and composite mineral admixture into a mixer, and dry mix at a speed of 500 r / min for 2 minutes to make the raw materials preliminarily mixed evenly;

[0088] S2.2. Adding water and stirring: Add water and admixture to the mixer, and continue to stir at a speed of 800 r / min for 3 - 5 minutes to form a uniform concrete mixture;

[0089] S2.3. Adding carbon fiber: When the stirring is about to end, slowly add carbon fiber reinforcement, and continue to stir for 1 - 2 minutes to ensure that the carbon fiber is evenly distributed in the concrete;

[0090] S3. Pouring and curing

[0091] S3.1. Pouring: Pour the stirred concrete mixture into the mold, and vibrate it thoroughly with a vibrator to remove air bubbles and ensure the compactness of the concrete;

[0092] S3.2. Curing: After pouring, cover and cure the concrete to keep the surface of the concrete moist.

[0093] In S3.2 of this embodiment, the curing temperature is 15 °C and the curing time is not less than 28 days.

[0094] Example 2:

[0095] A highly durable concrete, comprising the following composition components in mass parts:

[0096] Cement: 90 parts;

[0097] Nano-titanium dioxide powder: 1 part;

[0098] Superabsorbent resin: 3 parts;

[0099] Composite mineral admixture: 25 parts;

[0100] Coarse aggregate: 450 parts;

[0101] Fine aggregate: 225 parts;

[0102] Water: 53 parts;

[0103] Carbon fiber reinforcement: 1.5 parts;

[0104] Admixture: appropriate amount.

[0105] The cement in this embodiment is P.O 42.5 grade cement.

[0106] The particle size of the nano-titanium dioxide powder in this embodiment is less than 100 nm.

[0107] The superabsorbent resin in this embodiment is a polyacrylate superabsorbent resin.

[0108] The composite mineral admixture in this embodiment is fly ash: slag powder: silica fume = 1:1:1, and the three are mixed evenly in proportion to form a composite mineral admixture.

[0109] The coarse aggregate in this embodiment is one of crushed stone or pebbles, and the particle size is 10 mm.

[0110] The fine aggregate in this embodiment is one of natural sand or artificial sand, and the fineness modulus is 2.4.

[0111] The carbon fiber reinforcement in this embodiment is chopped carbon fiber, and the length is 7 mm.

[0112] A preparation process of high-durability concrete includes the following steps:

[0113] S1. Raw material preparation

[0114] S1.1. Weigh each raw material component according to the above mass parts;

[0115] S2. Mixing and stirring

[0116] S2.1. Premixing: Put the cement, nano-titanium dioxide powder, superabsorbent resin and composite mineral admixture into a mixer, and dry mix for 2 minutes at a speed of 550 r / min to make the raw materials preliminarily mixed evenly;

[0117] S2.2. Adding water and stirring: Add water and admixtures to the mixer, and continue to stir at a speed of 850 r / min for 3.5 minutes to form a uniform concrete mixture;

[0118] S2.3. Adding carbon fiber: When the stirring is about to end, slowly add the carbon fiber reinforcement and continue to stir for 1 minute to ensure that the carbon fiber is evenly distributed in the concrete;

[0119] S3. Pouring and curing

[0120] S3.1. Pouring: Pour the stirred concrete mixture into a mold, and vibrate it thoroughly with a vibrating rod to remove air bubbles and ensure the compactness of the concrete;

[0121] S3.2. Curing: After pouring, cover and cure the concrete to keep the surface of the concrete moist.

[0122] In S3.2 of this embodiment, the curing temperature is 17°C and the curing time is not less than 28 days.

[0123] Example 3:

[0124] A highly durable concrete, comprising the following components in parts by mass:

[0125] Cement: 90 parts;

[0126] Nano-titanium dioxide powder: 1.25 parts;

[0127] Superabsorbent resin: 3.5 parts;

[0128] Composite mineral admixture: 30 parts;

[0129] Coarse aggregate: 500 parts;

[0130] Fine aggregate: 250 parts;

[0131] Water: 55 parts;

[0132] Carbon fiber reinforcement: 2 parts;

[0133] Admixture: appropriate amount.

[0134] The cement in this embodiment is P.O 42.5 grade cement.

[0135] The particle size of the nano-titanium dioxide powder in this embodiment is less than 100 nm.

[0136] The superabsorbent resin in this embodiment is a polyacrylate-based superabsorbent resin.

[0137] The composite mineral admixture in this embodiment is fly ash: slag powder: silica fume = 1:1:1, and the three are mixed evenly in proportion to form a composite mineral admixture.

[0138] The coarse aggregate in this embodiment is one of crushed stone or pebbles, and the particle size is 18 mm.

[0139] The fine aggregate in this embodiment is one of natural sand or artificial sand, and the fineness modulus is 2.6.

[0140] The carbon fiber reinforcement in this embodiment is short-cut carbon fiber, and the length is 9 mm.

[0141] A preparation process of a highly durable concrete, comprising the following steps:

[0142] S1. Raw material preparation

[0143] S1.1. Weigh each raw material component according to the above parts by mass;

[0144] S2. Mixing and stirring

[0145] S2.1, Premixing: Put cement, nano-titanium dioxide powder, superabsorbent resin and composite mineral admixture into a mixer, and dry mix at a speed of 650 r / min for 2.5 minutes to preliminarily mix all raw materials evenly;

[0146] S2.2, Adding water and mixing: Add water and admixture to the mixer, and continue to mix at a speed of 1000 r / min for 4 minutes to form a uniform concrete mixture;

[0147] S2.3, Adding carbon fiber: When the mixing is about to end, slowly add carbon fiber reinforcement, and continue to mix for 1 - 2 minutes to ensure that the carbon fiber is evenly distributed in the concrete;

[0148] S3, Pouring and curing

[0149] S3.1, Pouring: Pour the mixed concrete mixture into the mold, and vibrate it thoroughly with a vibrating rod to remove air bubbles and ensure the compactness of the concrete;

[0150] S3.2, Curing: After pouring, cover and cure the concrete to keep the surface of the concrete moist.

[0151] In S3.2 of this embodiment, the curing temperature is 20 °C and the curing time is not less than 28 days.

[0152] Example 4:

[0153] A highly durable concrete, comprising the following components in parts by mass:

[0154] Cement: 100 parts;

[0155] Nano-titanium dioxide powder: 2 parts;

[0156] Superabsorbent resin: 5 parts;

[0157] Composite mineral admixture: 40 parts;

[0158] Coarse aggregate: 600 parts;

[0159] Fine aggregate: 300 parts;

[0160] Water: 60 parts;

[0161] Carbon fiber reinforcement: 3 parts;

[0162] Admixture: appropriate amount.

[0163] The cement in this embodiment is P.O 42.5 grade cement.

[0164] The particle size of the nano-titanium dioxide powder in this embodiment is less than 100 nm.

[0165] The superabsorbent resin in this embodiment is a polyacrylate superabsorbent resin.

[0166] The composite mineral admixture in this embodiment is fly ash:slag powder:silica fume = 1:1:1, and the three are mixed evenly in proportion to form a composite mineral admixture.

[0167] The coarse aggregate in this embodiment is one of crushed stone or pebbles, with a particle size of 5 - 31.5 mm.

[0168] The fine aggregate in this embodiment is one of natural sand or manufactured sand, with a fineness modulus of 3.0.

[0169] The carbon fiber reinforcement in this embodiment is chopped carbon fiber, with a length of 12 mm.

[0170] A preparation process of high - durability concrete includes the following steps:

[0171] S1. Raw material preparation

[0172] S1.1. Weigh each raw material component according to the above mass parts;

[0173] S2. Mixing and stirring

[0174] S2.1. Premixing: Put cement, nano - titanium dioxide powder, superabsorbent resin and composite mineral admixture into a mixer, and dry - mix at a speed of 800 r / min for 3 minutes to make the raw materials preliminarily mixed evenly;

[0175] S2.2. Adding water and stirring: Add water and admixtures to the mixer, and continue to stir at a speed of 1200 r / min for 5 minutes to form a uniform concrete mixture;

[0176] S2.3. Adding carbon fiber: When the stirring is about to end, slowly add the carbon fiber reinforcement and continue to stir for 2 minutes to ensure that the carbon fiber is evenly distributed in the concrete;

[0177] S3. Pouring and curing

[0178] S3.1. Pouring: Pour the stirred concrete mixture into a mold, and vibrate it thoroughly with a vibrating rod to remove air bubbles and ensure the compactness of the concrete;

[0179] S3.2. Curing: After pouring, cover and cure the concrete to keep the surface of the concrete moist.

[0180] In S3.2 of this embodiment, the curing temperature is 25 °C, and the curing time is not less than 28 days.

[0181] The high - durability concrete prepared by the above - mentioned embodiment has the following properties:

[0182]

[0183] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0184] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high durability concrete, characterized in that: The composition includes the following components by mass: Cement: 80-100 parts; Nano titanium dioxide powder: 0.5-2 parts; Super absorbent resin: 2-5 parts; Composite mineral admixture: 20-40 parts; Coarse aggregate: 400-600 parts; Fine aggregate: 200-300 parts; Water: 50-60 parts; Carbon fiber reinforcement: 1-3 parts; Admixture: appropriate amount.

2. A high durability concrete according to claim 1, characterized in that: The cement is PO 42.5 grade cement.

3. The high-durability concrete according to claim 1, characterized in that: The particle size of the nano titanium dioxide powder is less than 100 nm.

4. The high-durability concrete according to claim 1, characterized in that: The highly water-absorbent resin is a sodium polyacrylate highly water-absorbent resin.

5. The high-durability concrete according to claim 1, characterized in that: The composite mineral admixture is fly ash: slag powder: silica fume = 1:1:1, and the three are evenly mixed in proportion to form the composite mineral admixture.

6. The high-durability concrete according to claim 1, characterized in that: The coarse aggregate is one of crushed stone or pebbles, and the particle size is 5-31.5 mm.

7. The high-durability concrete according to claim 1, characterized in that: The fine aggregate is one of natural sand and artificial sand, and the fineness modulus is 2.3-3.

0.

8. The high-durability concrete according to claim 1, characterized in that: The carbon fiber reinforcement is chopped carbon fiber with a length of 6-12 mm.

9. A process for preparing high-durability concrete, characterized in that: The following steps are involved: S1. Raw material preparation S1.

1. Weigh each raw material component according to the above mass fractions; S2. Mixing and stirring S2.1, premixing: put cement, nano titanium dioxide powder, super absorbent resin and composite mineral admixture into a mixer, and dry mix at a speed of 500-800r / min for 2-3 minutes to make the raw materials preliminarily mixed; S2.2, adding water and stirring: add water and admixtures into the mixer, and continue stirring at a speed of 800-1200r / min for 3-5 minutes to form a uniform concrete mixture; S2.3, adding carbon fiber: When the mixing is about to end, slowly add the carbon fiber reinforcement and continue to stir for 1-2 minutes to ensure that the carbon fiber is evenly distributed in the concrete; S3. Casting and curing S3.1, Casting: Pour the stirred concrete mixture into the mold, vibrate it fully with a vibrator to remove bubbles and ensure that the concrete is dense; S3.

2. Maintenance: After pouring, the concrete should be covered and maintained to keep the concrete surface moist.

10. The process for preparing high-durability concrete according to claim 9, characterized in that: In S3.2, the curing temperature is 15-25° C., and the curing time is not less than 28 days.

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