阅读说明：本技术 一种具有高抗冲击性能的复合材料及其复合方法 (Composite material with high impact resistance and compounding method thereof ) 是由 胡静 李晓菲 秦布朗 于 2019-10-25 设计创作，主要内容包括：本发明属于建筑材料领域,具体涉及一种具有高抗冲击性能的复合材料及其复合方法。首先制备出具有高抗冲击性能的混凝土样品,在此基础上,利用聚脲喷涂技术,在两块混凝土样品之间及外表面上喷涂4～9mm厚的聚脲,制备出三明治夹心结构的复合材料。本申请制备出的复合材料保留了混凝土本身硬度高、坚固耐用、原料来源广泛、制作方法简单、可塑性强的优良特性,且具有聚脲耐化学腐蚀、高强度、高抗渗、耐磨、热稳定好、柔韧抗冲击、无接缝、与混凝土附着力强等优点,同时显著提高了混凝土的抗冲击性,克服了单一混凝土的局限性,使混凝土的应用范围得到了更进一步地扩展。(The invention belongs to the field of building materials, and particularly relates to a composite material with high impact resistance and a compounding method thereof. Firstly, preparing concrete samples with high impact resistance, and spraying polyurea with the thickness of 4-9mm between the two concrete samples and on the outer surface by using a polyurea spraying technology on the basis to prepare the composite material with the sandwich structure. The composite material prepared by the application keeps the excellent characteristics of high hardness, firmness and durability, wide raw material source, simple manufacturing method and strong plasticity of the concrete, has the advantages of chemical corrosion resistance, high strength, high impermeability, wear resistance, good thermal stability, flexibility and impact resistance, no seam, strong adhesion with the concrete and the like of polyurea, obviously improves the impact resistance of the concrete, overcomes the limitation of single concrete, and further expands the application range of the concrete.)

1. A high impact resistant composite material, characterized in that the structure of the composite material is: polyurea with the thickness of 4-9mm is sprayed between the two concrete samples and on the outer surface of the two concrete samples to form the composite material with a sandwich structure.

2. A method for compounding a high impact resistant composite material according to claim 1, wherein the compounding method comprises the steps of:

(1) preparing concrete, namely firstly adding 38.0g of stones, 22.6g of superfine fibers, 40.9g of sand and 69.2g of lime into a stirrer in sequence, uniformly mixing, then slowly pouring 11% of water, stirring for 3-4min to avoid the superfine fibers from agglomerating, observing that the surface of the superfine fibers is wet, finally pouring the superfine fibers into a mold, flattening and fixing the mold, and vibrating for 10min for molding, wherein no large amount of bubbles overflow from the surface, namely the preparation of the high-impact-resistance concrete is finished;

(2) curing the concrete, namely placing the concrete in an environment room with the temperature of 17.5-27.5 ℃ and the humidity of 55-85% for curing for more than 3 days to finish curing the high-impact-resistance concrete;

(3) and (3) on the basis of the step (2), spraying No.XS-350 polyurea with the thickness of 4-9mm on the surfaces of the two pieces of concrete at a constant speed, and then overlapping the two pieces of concrete to prepare the composite material with the sandwich structure.

3. The method of claim 2, wherein the stone particle size is 3.0-6.0 mm; the grain diameter of the sand is 0.1-1.0mm, and the diameter of the superfine fiber is 0.2 multiplied by 6 mm.

4. The method of compounding a high impact resistant composite material as recited in claim 2, wherein: the spraying polyurea adopts a Reactor instrument produced by Graco company, single concrete is sprayed firstly, and then two pieces of concrete are overlapped together; the polyurea was pretreated at 70-90 ° f prior to spraying.

5. Use of a high impact resistant composite material according to claim 1 wherein: the composite material is used in the fields of explosion-proof buildings, safes and ATM machines.

Technical Field

The invention belongs to the field of building materials, and particularly relates to a high-impact-resistance composite material and a compounding method thereof.

Background

Modern building structures inevitably bear dynamic loads such as impacts, earthquakes, missiles and the like. As the concrete is used as the building material with the largest use amount at present, the impact resistance of the concrete, namely the advantages and disadvantages of the capability of resisting impact fatigue damage and crack toughness of the concrete under the action of impact load, are in practical relation with the life and property safety of people, so that the research significance for improving the impact resistance of the concrete is significant and imperative.

The duration of the impact load is short, the energy is high, the impact load can cause great damage to the concrete structure, the safety, the durability and the like of the concrete engineering are seriously affected, and the existing concrete cannot meet the requirement of high impact resistance of some building engineering. Therefore, how to improve the impact resistance of concrete has been widely concerned by scholars at home and abroad.

Disclosure of Invention

The invention provides a high impact resistance composite material and a compounding method thereof, the concrete obtained by the method not only keeps the excellent characteristics of high hardness, firmness and durability, wide raw material source, simple manufacturing method and strong plasticity of the concrete, but also keeps the advantages of polyurea chemical corrosion resistance, high strength, high impermeability, wear resistance, good thermal stability, flexibility and impact resistance, no seam, strong adhesion with the concrete and the like, and simultaneously obviously improves the impact resistance of the concrete, overcomes the limitation of single concrete and further expands the application range of the concrete.

The technical scheme for realizing the invention is as follows:

the invention provides a composite material with high impact resistance, which has the structure that: polyurea with the thickness of 4-9mm is sprayed between the two concrete samples and on the outer surface of the two concrete samples to form the composite material with a sandwich structure.

The invention provides a compounding method of a composite material with high impact resistance, which comprises the following steps:

(1) preparing concrete, namely firstly adding 38.0g of stones (with the particle size of 3.0-6.0mm), 22.6g of superfine fibers (with the diameter of 0.2 х 6mm), 40.9g of sand (with the particle size of 0.1-1.0mm) and 69.2g of lime into a stirrer in sequence, uniformly mixing, then slowly pouring 21.15g of water with the content of 11%, stirring for 3-4min, avoiding the superfine fibers from being coagulated into lumps, observing that the surfaces of the superfine fibers are wet, finally pouring into a mold, flattening and fixing the mold, and then vibrating for 10min by using a vibrating instrument for molding, wherein the surface is required to have no large amount of bubbles, namely the preparation of the high-impact-resistance concrete is finished.

(2) And (3) curing the concrete, namely placing the concrete in an environment with the temperature of 17.5-27.5 ℃ and the humidity of 55-85% for curing for more than 3 days, wherein if the time is allowed, the longer the general curing time is, the better the impact resistance is, and curing the concrete with high impact resistance is finished when the surface of the concrete is dry.

(3) And (3) on the basis of the step (2), spraying No.XS-350 polyurea with the thickness of 4-9mm on the surfaces of the two pieces of concrete at a constant speed, spraying the single concrete, and then overlapping to prepare the composite material with the sandwich structure. No. XS-350 polyurea coating was pretreated at 70-90 ℉ prior to use; the spraying equipment is a Reactor instrument produced by Graco company and has the functions of heating and pressurizing.

The high impact resistance composite material prepared by the method is suitable for engineering buildings with strict impact resistance requirements, such as explosion-proof buildings, safes, ATM machines and other fields.

The invention adopts a tower falling test to test the shock resistance, the name of a test instrument is Drop tower, and the test principle is as follows: the amount of energy absorbed by the sample in the process is calculated by capturing the speed change DeltaV of the weight impacting the sample, and the larger the speed difference DeltaV is, the more energy is absorbed, and the better the impact resistance of the sample is.

After adopting above-mentioned technical scheme, this technique has following advantage:

in the process of concrete forming, a vibration method is adopted to enable a large amount of air bubbles in the concrete to overflow, the vibration duration is selected according to the thickness of a concrete plate, the concrete manufactured by the method has the advantages of no defect of rough surface and multiple holes, and meanwhile, the raw materials in the concrete are combined more tightly, so that the impact resistance of the concrete is effectively enhanced.

The concrete is coated with the polyurea in all directions, so that the attractiveness of the final product is improved, the protection of the concrete coated with the polyurea is all-directional, and the concrete is difficult to break through the protection of the polyurea even under a strong impact condition.

Drawings

FIG. 1 is a schematic structural view of a composite material;

fig. 2 is a profile view of a composite material.

FIG. 3 is a diagram of the Drop hammer impact test impact resistance device Drop Tower.

Detailed Description