Carbon fiber reinforced concrete composite material and preparation process thereof

Abstract

The invention discloses a carbon fiber reinforced concrete composite material and a preparation process thereof, and the carbon fiber reinforced concrete composite material comprises the following components by mass: 100-180 parts of cement; 50 to 100 parts of broken stone; 50 to 80 parts of medium sand; 20 to 40 parts of fly ash; 2 to 8 parts of nano silicon dioxide; 0.5 to 2 parts of a polycarboxylic acid type high-performance water reducing agent; 3 to 10 parts of carbon fiber; 0.1 to 1 part of a graphene nanosheet; a proper amount of water; according to the carbon fiber reinforced concrete composite material disclosed by the invention, the nano silicon dioxide, the polycarboxylic acid high-performance water reducing agent, the carbon fibers and the graphene nanosheets are introduced, so that the interface bonding strength between the carbon fibers and a concrete matrix is remarkably improved, and the overall mechanical property of the composite material is enhanced; uniform dispersion of the carbon fibers in the concrete is realized, and the uniformity and stability of the composite material are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and specifically relates to a carbon fiber reinforced concrete composite material and a preparation process thereof. Background Art

[0002] Traditional concrete materials have certain limitations in terms of strength, toughness, and crack resistance, and it is difficult to meet the needs of modern engineering for high-performance building materials. Carbon fiber, as a lightweight and high-strength material, has excellent mechanical properties and corrosion resistance. Introducing it into concrete can effectively improve the comprehensive performance of concrete. However, in the existing technology, the dispersion uniformity of carbon fiber in concrete is poor, and there is a lack of innovative ingredients to improve the comprehensive performance of composite materials. Therefore, it is of great significance to develop a carbon fiber reinforced concrete composite material with innovative ingredients and optimized preparation process.

[0003] Based on this, a carbon fiber reinforced concrete composite material 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 carbon fiber reinforced concrete composite material and a preparation process thereof, which effectively solves the problems raised in the above background.

[0005] To achieve the above object, the present invention provides the following technical solution: a carbon fiber reinforced concrete composite material, comprising the following components in parts by mass:

[0006] Cement: 100-180 parts;

[0007] Crushed stone: 50-100 parts;

[0008] Medium sand: 50-80 parts;

[0009] Fly ash: 20-40 parts;

[0010] Nano silicon dioxide: 2-8 parts;

[0011] Polycarboxylic acid high performance water reducing agent: 0.5-2 parts;

[0012] Carbon fiber: 3-10 parts;

[0013] Graphene nanosheets: 0.1-1 part;

[0014] Water: appropriate amount.

[0015] Preferably, the carbon fiber has a length of 10-50 mm and a diameter of 5-10 μm.

[0016] A preparation process of a carbon fiber reinforced concrete composite material comprises the following steps:

[0017] S1. Raw material preparation

[0018] S1.1. Weigh each raw material component according to the above mass fractions;

[0019] S1.2, performing surface treatment on the carbon fiber, immersing the carbon fiber in a carbon fiber surface treatment agent for 10-30 minutes, and then taking it out to dry;

[0020] S2. Stirring and mixing

[0021] S2.1. Add cement, crushed stone, medium sand, fly ash and nano-silicon dioxide into a mixer and stir at a low speed for 5-10 minutes to mix the components evenly;

[0022] S2.2, add polycarboxylic acid high performance water reducer, continue stirring at low speed for 5-10 minutes to fully disperse the water reducer in the mixture;

[0023] S2.3, add the surface treated carbon fiber and graphene nanosheets, increase the stirring speed to medium speed, and stir for 10-20 minutes to evenly disperse the carbon fiber and graphene nanosheets in the mixture;

[0024] S3, add water and stir

[0025] S3.1. Gradually add an appropriate amount of water during the mixing process, and adjust the amount of water added according to the workability of the concrete to make the mixture reach an appropriate consistency;

[0026] S3.2, continue stirring at medium speed for 5-10 minutes to ensure that the mixture is fully mixed;

[0027] S4, molding and curing

[0028] S4.1. Pour the stirred mixture into a mold and vibrate it to expel bubbles in the mixture;

[0029] S4.2. Place the formed concrete products in a curing room for curing at a temperature of 20-25°C, a humidity of more than 90%, and a curing time of more than 28 days.

[0030] Preferably, in S2.1, the rotation speed of the low-speed stirring is 50-100 r / min.

[0031] Preferably, in S2.3, the rotation speed of medium-speed stirring is 150-250 r / min.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The carbon fiber reinforced concrete composite material of the present invention significantly improves the interfacial bonding strength between the carbon fiber and the concrete matrix by introducing nano-silicon dioxide, a polycarboxylic acid-based high-performance water reducing agent, carbon fiber and graphene nanosheet components, and enhances the overall mechanical properties of the composite material. The preparation process of the present invention realizes uniform dispersion of the carbon fiber in the concrete, and improves the uniformity and stability of the composite material.

[0034] The carbon fiber reinforced concrete composite material of the present invention has the advantages of light weight, high strength, corrosion resistance, good crack resistance, etc., can be widely used in engineering fields such as construction, bridges, tunnels, etc., and has broad market prospects and application value. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] The present invention provides a carbon fiber reinforced concrete composite material, comprising the following components in parts by mass:

[0037] Cement: 100-180 parts;

[0038] Crushed stone: 50-100 parts;

[0039] Medium sand: 50-80 parts;

[0040] Fly ash: 20-40 parts;

[0041] Nano silicon dioxide: 2-8 parts;

[0042] Polycarboxylic acid high performance water reducing agent: 0.5-2 parts;

[0043] Carbon fiber: 3-10 parts;

[0044] Graphene nanosheets: 0.1-1 part;

[0045] Water: appropriate amount.

[0046] The carbon fiber of this embodiment has a length of 10-50 mm and a diameter of 5-10 μm.

[0047] A preparation process of a carbon fiber reinforced concrete composite material comprises the following steps:

[0048] S1. Raw material preparation

[0049] S1.1. Weigh each raw material component according to the above mass fractions;

[0050] S1.2, performing surface treatment on the carbon fiber, immersing the carbon fiber in a carbon fiber surface treatment agent for 10-30 minutes, and then taking it out to dry;

[0051] S2. Stirring and mixing

[0052] S2.1. Add cement, crushed stone, medium sand, fly ash and nano-silicon dioxide into a mixer and stir at a low speed for 5-10 minutes to mix the components evenly;

[0053] S2.2, add polycarboxylic acid high performance water reducer, continue stirring at low speed for 5-10 minutes to fully disperse the water reducer in the mixture;

[0054] S2.3, add the surface treated carbon fiber and graphene nanosheets, increase the stirring speed to medium speed, and stir for 10-20 minutes to evenly disperse the carbon fiber and graphene nanosheets in the mixture;

[0055] S3, add water and stir

[0056] S3.1. Gradually add an appropriate amount of water during the mixing process, and adjust the amount of water added according to the workability of the concrete to make the mixture reach an appropriate consistency;

[0057] S3.2, continue stirring at medium speed for 5-10 minutes to ensure that the mixture is fully mixed;

[0058] S4, molding and curing

[0059] S4.1. Pour the stirred mixture into a mold and vibrate it to expel bubbles in the mixture;

[0060] S4.2. Place the formed concrete products in a curing room for curing at a temperature of 20-25°C, a humidity of more than 90%, and a curing time of more than 28 days.

[0061] In S2.1 of this embodiment, the rotation speed of the low-speed stirring is 50-100 r / min.

[0062] In S2.3 of this embodiment, the rotation speed of medium-speed stirring is 150-250 r / min.

[0063] Embodiment 1:

[0064] A carbon fiber reinforced concrete composite material, comprising the following components in parts by mass:

[0065] Cement: 100 parts;

[0066] Crushed stone: 50 parts;

[0067] Medium sand: 50 parts;

[0068] Fly ash: 20 parts;

[0069] Nano silicon dioxide: 2 parts;

[0070] Polycarboxylic acid high performance water reducing agent: 0.5 parts;

[0071] Carbon fiber: 3 parts;

[0072] Graphene nanosheets: 0.1 parts;

[0073] Water: appropriate amount.

[0074] The carbon fiber of this embodiment has a length of 10 mm and a diameter of 5 μm.

[0075] A preparation process of a carbon fiber reinforced concrete composite material comprises the following steps:

[0076] S1. Raw material preparation

[0077] S1.1. Weigh each raw material component according to the above mass fractions;

[0078] S1.2, performing surface treatment on the carbon fiber, immersing the carbon fiber in a carbon fiber surface treatment agent for 10 minutes, and then taking it out to dry;

[0079] S2. Stirring and mixing

[0080] S2.1. Add cement, crushed stone, medium sand, fly ash and nano-silicon dioxide into a mixer and stir at a low speed for 5 minutes to mix the components evenly;

[0081] S2.2, add polycarboxylic acid high performance water reducer, continue stirring at low speed for 5 minutes to fully disperse the water reducer in the mixture;

[0082] S2.3, adding the surface treated carbon fiber and graphene nanosheets, increasing the stirring speed to medium speed, stirring for 10 minutes, so that the carbon fiber and graphene nanosheets are evenly dispersed in the mixture;

[0083] S3, add water and stir

[0084] S3.1. Gradually add an appropriate amount of water during the mixing process, and adjust the amount of water added according to the workability of the concrete to make the mixture reach an appropriate consistency;

[0085] S3.2, continue stirring at medium speed for 5 minutes to ensure that the mixture is fully mixed;

[0086] S4, molding and curing

[0087] S4.1. Pour the stirred mixture into a mold and vibrate it to expel bubbles in the mixture;

[0088] S4.2. Place the formed concrete products in a curing room for curing at a temperature of 20°C and a humidity of more than 90% for 28 days.

[0089] In S2.1 of this embodiment, the rotation speed of the low-speed stirring is 50 r / min.

[0090] In S2.3 of this embodiment, the rotation speed of medium-speed stirring is 150 r / min.

[0091] Embodiment 2:

[0092] A carbon fiber reinforced concrete composite material, comprising the following components in parts by mass:

[0093] Cement: 180 parts;

[0094] Crushed stone: 100 parts;

[0095] Medium sand: 80 parts;

[0096] Fly ash: 40 parts;

[0097] Nano silicon dioxide: 8 parts;

[0098] Polycarboxylic acid high performance water reducing agent: 2 parts;

[0099] Carbon fiber: 10 parts;

[0100] Graphene nanosheets: 1 part;

[0101] Water: appropriate amount.

[0102] The carbon fiber of this embodiment has a length of 50 mm and a diameter of 10 μm.

[0103] A preparation process of a carbon fiber reinforced concrete composite material comprises the following steps:

[0104] S1. Raw material preparation

[0105] S1.1. Weigh each raw material component according to the above mass fractions;

[0106] S1.2, performing surface treatment on the carbon fiber, immersing the carbon fiber in a carbon fiber surface treatment agent for 30 minutes, and then taking it out to dry;

[0107] S2. Stirring and mixing

[0108] S2.1. Add cement, crushed stone, medium sand, fly ash and nano-silicon dioxide into a mixer and stir at a low speed for 10 minutes to mix the components evenly;

[0109] S2.2, add polycarboxylic acid high performance water reducer, continue stirring at low speed for 10 minutes to fully disperse the water reducer in the mixture;

[0110] S2.3, add the surface treated carbon fiber and graphene nanosheets, increase the stirring speed to medium speed, and stir for 20 minutes to evenly disperse the carbon fiber and graphene nanosheets in the mixture;

[0111] S3, add water and stir

[0112] S3.1. Gradually add an appropriate amount of water during the mixing process, and adjust the amount of water added according to the workability of the concrete to make the mixture reach an appropriate consistency;

[0113] S3.2, continue stirring at medium speed for 10 minutes to ensure that the mixture is fully mixed;

[0114] S4, molding and curing

[0115] S4.1. Pour the stirred mixture into a mold and vibrate it to expel bubbles in the mixture;

[0116] S4.2. Place the formed concrete products in a curing room for curing at a temperature of 25°C and a humidity of more than 90% for 42 days.

[0117] In S2.1 of this embodiment, the rotation speed of the low-speed stirring is 100 r / min.

[0118] In S2.3 of this embodiment, the rotation speed of medium-speed stirring is 250 r / min.

[0119] Embodiment 3:

[0120] A carbon fiber reinforced concrete composite material, comprising the following components in parts by mass:

[0121] Cement: 140 parts;

[0122] Crushed stone: 75 parts;

[0123] Medium sand: 65 parts;

[0124] Fly ash: 30 parts;

[0125] Nano silicon dioxide: 5 parts;

[0126] Polycarboxylic acid high performance water reducing agent: 1.2 parts;

[0127] Carbon fiber: 6 parts;

[0128] Graphene nanosheets: 0.5 parts;

[0129] Water: appropriate amount.

[0130] The carbon fiber of this embodiment has a length of 30 mm and a diameter of 7 μm.

[0131] A preparation process of a carbon fiber reinforced concrete composite material comprises the following steps:

[0132] S1. Raw material preparation

[0133] S1.1. Weigh each raw material component according to the above mass fractions;

[0134] S1.2, performing surface treatment on the carbon fiber, immersing the carbon fiber in a carbon fiber surface treatment agent for 20 minutes, and then taking it out to dry;

[0135] S2. Stirring and mixing

[0136] S2.1. Add cement, crushed stone, medium sand, fly ash and nano-silicon dioxide into a mixer and stir at a low speed for 7 minutes to mix the components evenly;

[0137] S2.2, add polycarboxylic acid high performance water reducer, continue stirring at low speed for 7 minutes to fully disperse the water reducer in the mixture;

[0138] S2.3, adding the surface treated carbon fiber and graphene nanosheets, increasing the stirring speed to medium speed, stirring for 15 minutes, so that the carbon fiber and graphene nanosheets are evenly dispersed in the mixture;

[0139] S3, add water and stir

[0140] S3.1. Gradually add an appropriate amount of water during the mixing process, and adjust the amount of water added according to the workability of the concrete to make the mixture reach an appropriate consistency;

[0141] S3.2. Continue stirring at medium speed for 7 minutes to ensure that the mixture is fully mixed;

[0142] S4, molding and curing

[0143] S4.1. Pour the stirred mixture into a mold and vibrate it to expel bubbles in the mixture;

[0144] S4.2. Place the formed concrete products in a curing room for curing at a temperature of 23°C and a humidity of more than 90% for 35 days.

[0145] In S2.1 of this embodiment, the rotation speed of the low-speed stirring is 75 r / min.

[0146] In S2.3 of this embodiment, the rotation speed of medium-speed stirring is 200 r / min.

[0147] Embodiment 4:

[0148] A carbon fiber reinforced concrete composite material, comprising the following components in parts by mass:

[0149] Cement: 120 parts;

[0150] Crushed stone: 65 parts;

[0151] Medium sand: 60 parts;

[0152] Fly ash: 25 parts;

[0153] Nano silicon dioxide: 3 parts;

[0154] Polycarboxylic acid high performance water reducing agent: 0.8 parts;

[0155] Carbon fiber: 4 parts;

[0156] Graphene nanosheets: 0.5 parts;

[0157] Water: appropriate amount.

[0158] The carbon fiber of this embodiment has a length of 15 mm and a diameter of 6 μm.

[0159] A preparation process of a carbon fiber reinforced concrete composite material comprises the following steps:

[0160] S1. Raw material preparation

[0161] S1.1. Weigh each raw material component according to the above mass fractions;

[0162] S1.2, performing surface treatment on the carbon fiber, immersing the carbon fiber in a carbon fiber surface treatment agent for 15 minutes, and then taking it out to dry;

[0163] S2. Stirring and mixing

[0164] S2.1. Add cement, crushed stone, medium sand, fly ash and nano-silicon dioxide into a mixer and stir at a low speed for 6 minutes to mix the components evenly;

[0165] S2.2, add polycarboxylic acid high performance water reducer, continue stirring at low speed for 6 minutes to fully disperse the water reducer in the mixture;

[0166] S2.3, adding the surface treated carbon fiber and graphene nanosheets, increasing the stirring speed to medium speed, stirring for 12 minutes, so that the carbon fiber and graphene nanosheets are evenly dispersed in the mixture;

[0167] S3, add water and stir

[0168] S3.1. Gradually add an appropriate amount of water during the mixing process, and adjust the amount of water added according to the workability of the concrete to make the mixture reach an appropriate consistency;

[0169] S3.2. Continue stirring at medium speed for 6 minutes to ensure that the mixture is fully mixed;

[0170] S4, molding and curing

[0171] S4.1. Pour the stirred mixture into a mold and vibrate it to expel bubbles in the mixture;

[0172] S4.2. Place the formed concrete products in a curing room for curing at a temperature of 21°C and a humidity of more than 90% for 30 days.

[0173] In S2.1 of this embodiment, the rotation speed of the low-speed stirring is 60 r / min.

[0174] In S2.3 of this embodiment, the rotation speed of medium-speed stirring is 180 r / min.

[0175] The carbon fiber reinforced concrete composite material prepared by the above embodiment has the following properties:

[0176]

[0177]

[0178] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0179] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A carbon fiber reinforced concrete composite material, characterized in that: The composition includes the following components by mass: Cement: 100-180 parts; Crushed stone: 50-100 parts; Medium sand: 50-80 parts; Fly ash: 20-40 parts; Nano silicon dioxide: 2-8 parts; Polycarboxylic acid high performance water reducing agent: 0.5-2 parts; Carbon fiber: 3-10 parts; Graphene nanosheets: 0.1-1 part; Water: appropriate amount.

2. The carbon fiber reinforced concrete composite material according to claim 1, characterized in that: The carbon fiber has a length of 10-50 mm and a diameter of 5-10 μm.

3. A process for preparing a carbon fiber reinforced concrete composite material, 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; S1.2, performing surface treatment on the carbon fiber, immersing the carbon fiber in a carbon fiber surface treatment agent for 10-30 minutes, and then taking it out to dry; S2. Stirring and mixing S2.

1. Add cement, crushed stone, medium sand, fly ash and nano-silicon dioxide into a mixer and stir at a low speed for 5-10 minutes to mix the components evenly; S2.2, add polycarboxylic acid high performance water reducer, continue stirring at low speed for 5-10 minutes to fully disperse the water reducer in the mixture; S2.3, add the surface treated carbon fiber and graphene nanosheets, increase the stirring speed to medium speed, and stir for 10-20 minutes to evenly disperse the carbon fiber and graphene nanosheets in the mixture; S3, add water and stir S3.

1. Gradually add an appropriate amount of water during the mixing process, and adjust the amount of water added according to the workability of the concrete to make the mixture reach an appropriate consistency; S3.2, continue stirring at medium speed for 5-10 minutes to ensure that the mixture is fully mixed; S4, molding and curing S4.

1. Pour the stirred mixture into a mold and vibrate it to expel bubbles in the mixture; S4.

2. Place the formed concrete products in a curing room for curing at a temperature of 20-25°C, a humidity of more than 90%, and a curing time of more than 28 days.

4. The process for preparing a carbon fiber reinforced concrete composite material according to claim 3, characterized in that: In S2.1, the rotation speed of the low-speed stirring is 50-100 r / min.

5. The process for preparing a carbon fiber reinforced concrete composite material according to claim 3, characterized in that: In S2.3, the rotation speed of medium-speed stirring is 150-250 r / min.

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