阅读说明：本技术 混凝土用增强增韧剂及其制备方法和应用 (Reinforcing and toughening agent for concrete and preparation method and application thereof ) 是由 卫志盛 林庆宇 卫志美 于 2019-11-21 设计创作，主要内容包括：本发明涉及一种混凝土用增强增韧剂及其制备方法和应用,属于混凝土材料技术领域。本发明提供一种混凝土用增强增韧剂,所述混凝土用增强增韧剂为高强度纤维表面负载环氧树脂纤维形成的复合纤维,其中,所述高强度纤维为玻璃纤维、碳纤维、芳酰胺纤维、玄武岩纤维、聚酰亚胺纤维、聚苯硫醚纤维或聚苯并双噁唑纤维。本发明所得混凝土用增强增韧剂可以同时提高混凝土的强度和韧性,延长混凝土的使用寿命。(The invention relates to a reinforcing and toughening agent for concrete and a preparation method and application thereof, belonging to the technical field of concrete materials. The invention provides a concrete reinforcing and toughening agent, which is a composite fiber formed by loading epoxy resin fibers on the surface of a high-strength fiber, wherein the high-strength fiber is a glass fiber, a carbon fiber, an aramid fiber, a basalt fiber, a polyimide fiber, a polyphenylene sulfide fiber or a polybenzobisoxazole fiber. The reinforcing and toughening agent for concrete can simultaneously improve the strength and toughness of concrete and prolong the service life of the concrete.)

1. The reinforcing and toughening agent for concrete is a composite fiber formed by loading epoxy resin fibers on the surface of a high-strength fiber, wherein the high-strength fiber is a glass fiber, a carbon fiber, an aramid fiber, a basalt fiber, a polyimide fiber, a polyphenylene sulfide fiber or a polybenzobisoxazole fiber.

2. The reinforcing and toughening agent for concrete according to claim 1, wherein a mass ratio of the high-strength fiber to the epoxy resin fiber in the reinforcing and toughening agent for concrete is 28 to 200.

3. The reinforcing and toughening agent for concrete according to claim 1 or 2, wherein the diameter of the epoxy resin fiber is 300nm to 1000 nm.

4. The reinforcing and toughening agent for concrete according to claim 1 or 2, wherein the reinforcing and toughening agent for concrete is prepared by the following method: spinning the epoxy resin fiber on the surface of the high-strength fiber by an electrostatic spinning method; further, the method comprises the following steps: stirring and dissolving 30-200 parts by weight of epoxy resin and 300-1000 parts by weight of solvent at 20-80 ℃ for 1-6 hours to form a homogeneous spinning solution; then spraying the spinning solution onto a receiving device with the surface carrying high-strength fibers by adopting a solution electrostatic spinning method to obtain the composite fibers of the high-strength fibers/epoxy resin fibers; wherein, the solution electrostatic spinning method comprises the following process conditions: the environment humidity is 50% -80%, and the spinning time is 5-15 min.

5. The reinforcing and toughening agent for concrete according to claim 4, wherein in the process conditions of the solution electrospinning method, the diameter of a spinneret is 0.3-4 mm, the electrostatic spinning voltage is 10-35 kv, the receiving distance is 6-45 cm, and the ambient temperature is 0-30 ℃.

6. The reinforcing and toughening agent for concrete according to claim 4 or 5, wherein the solvent is at least one of acetone, N dimethylformamide, N dimethylacetamide, cyclohexanone or benzyl alcohol.

7. The reinforcing and toughening agent for concrete according to claim 1 or 2, wherein the epoxy resin is bisphenol F type epoxy resin, bisphenol S type epoxy resin, bisphenol a type epoxy resin, novolac epoxy resin or aliphatic epoxy resin.

8. A preparation method of the reinforcing and toughening agent for concrete according to any one of claims 1 to 7, characterized by comprising the following steps: and spinning the epoxy resin fiber on the surface of the high-strength fiber by an electrostatic spinning method.

9. The preparation method of the reinforcing and toughening agent for concrete according to claim 8, wherein the preparation method comprises the following steps: stirring and dissolving 30-200 parts by weight of epoxy resin and 300-1000 parts by weight of solvent at 20-80 ℃ for 1-6 hours to form a homogeneous spinning solution; then spraying the spinning solution onto a receiving device with the surface carrying high-strength fibers by adopting a solution electrostatic spinning method to obtain the composite fibers of the high-strength fibers/epoxy resin fibers; wherein, the solution electrostatic spinning method comprises the following process conditions: the environment humidity is 50% -80%, and the spinning time is 5-15 min; further, in the process conditions of the solution electrostatic spinning method, the diameter of a spinning nozzle is 0.3-4 mm, the electrostatic spinning voltage is 10-35 kv, the receiving distance is 6-45 cm, and the ambient temperature is 0-30 ℃.

10. The application of the concrete reinforcing and toughening agent in concrete is characterized in that the application method comprises the following steps: adding the reinforcing and toughening agent into concrete for heat treatment, wherein the heat treatment time is 1-8 h, and the temperature is 80-200 ℃; the doping amount is as follows: 100 parts of concrete and 1-20 parts of reinforcing and toughening agent; the reinforcing and toughening agent for concrete is the reinforcing and toughening agent in any one of claims 1 to 7, or the reinforcing and toughening agent prepared by the preparation method in claim 8 or 9.

Technical Field

The invention relates to a reinforcing and toughening agent for concrete and a preparation method and application thereof, belonging to the technical field of concrete materials.

Background

Concrete structures play an important role in modern buildings, and occupy a great deal of weight in the overall engineering quality, and concrete cannot be separated from factories or residential buildings. But the concrete often encounters the problems of cracks, low strength and the like in the using process. The current treatment method is to directly lay an adhesive of epoxy resin on the surface of concrete to repair cracks. However, the interface between epoxy resin and concrete is poor, resulting in poor adhesion between the epoxy resin and concrete and poor crack repairing effect. Particularly, the cracking of concrete is more serious in a high-temperature state.

On the other hand, the strength of concrete is poor, and the concrete is reinforced by steel bars in the actual use process. Today, new materials are developed, and other high-strength materials can be used to partially replace reinforcing steel bars to improve the strength of concrete.

Disclosure of Invention

Aiming at the defects, the invention provides a reinforcing and toughening agent for concrete, which can simultaneously improve the strength and toughness of the concrete and prolong the service life of the concrete.

The technical scheme of the invention is as follows:

the first technical problem to be solved by the invention is to provide a reinforcing and toughening agent for concrete, which is a composite fiber formed by loading epoxy resin fibers on the surface of a high-strength fiber, wherein the high-strength fiber is a glass fiber, a carbon fiber, an aramid fiber, a basalt fiber, a polyimide fiber, a polyphenylene sulfide fiber or a polybenzobisoxazole fiber.

Further, in the concrete reinforcing and toughening agent, the mass ratio of the high-strength fibers to the epoxy resin fibers is 28-200.

Further, the diameter of the epoxy resin fiber is 300 nm-1000 nm.

Further, the reinforcing and toughening agent for concrete is prepared by adopting the following method: the method for spinning the epoxy resin fiber on the surface of the high-strength fiber by an electrostatic spinning method comprises the following specific steps: stirring and dissolving 30-200 parts by weight of epoxy resin and 300-1000 parts by weight of solvent at 20-80 ℃ for 1-6 hours to form a homogeneous spinning solution; then spraying the spinning solution onto a receiving device with the surface carrying high-strength fibers by adopting a solution electrostatic spinning method to obtain the composite fibers of the high-strength fibers/epoxy resin fibers; wherein, the solution electrostatic spinning method comprises the following process conditions: the environment humidity is 50% -80%, and the spinning time is 5-15 min.

Further, in the process conditions of the solution electrostatic spinning method, the diameter of a spinning nozzle is 0.3-4 mm, the electrostatic spinning voltage is 10-35 kv, the receiving distance is 6-45 cm, and the ambient temperature is 0-30 ℃.

Further, in the above method, the solvent is: at least one of acetone, N dimethylformamide, N dimethylacetamide, cyclohexanone or benzyl alcohol.

Further, the epoxy resin is: bisphenol F-type epoxy resin, bisphenol S-type epoxy resin, bisphenol a-type epoxy resin, novolac epoxy resin, or aliphatic epoxy resin.

The second technical problem to be solved by the invention is to provide a preparation method of the reinforcing and toughening agent for concrete, which comprises the following steps: the method for spinning the epoxy resin fiber on the surface of the high-strength fiber by an electrostatic spinning method comprises the following specific steps: stirring and dissolving 30-200 parts by weight of epoxy resin and 300-1000 parts by weight of solvent at 20-80 ℃ for 1-6 hours to form a homogeneous spinning solution; then spraying the spinning solution onto a receiving device with the surface carrying high-strength fibers by adopting a solution electrostatic spinning method to obtain the composite fibers of the high-strength fibers/epoxy resin fibers; wherein, the solution electrostatic spinning method comprises the following process conditions: the environment humidity is 50% -80%, and the spinning time is 5-15 min.

Further, in the process conditions of the solution electrostatic spinning method, the diameter of a spinning nozzle is 0.3-4 mm, the electrostatic spinning voltage is 10-35 kv, the receiving distance is 6-45 cm, and the ambient temperature is 0-30 ℃.

The third technical problem to be solved by the invention is to provide the application of the concrete reinforcing and toughening agent in concrete, and the specific method comprises the following steps: adding the obtained reinforcing and toughening agent into concrete for heat treatment, wherein the heat treatment time is 1-8 h, and the temperature is 80-200 ℃; the doping amount is as follows: 100 parts of concrete and 1-20 parts of reinforcing and toughening agent. The purpose of the heat treatment is to accelerate the curing of the epoxy resin between the concrete and the high-performance fibers, and to achieve the bonding effect.

In the present invention, unless otherwise specified, they are parts by weight.

The invention has the beneficial effects that:

the invention provides a reinforcing and toughening agent for concrete, namely epoxy resin fibers are spun on the surface of high-strength fibers to prepare composite fibers, and the reinforcing and toughening agent can simultaneously reinforce and toughen concrete to prepare high-strength and high-toughness concrete which is directly used in the building industry.

Detailed Description

The following examples are given to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.