阅读说明：本技术 一种高柔韧型薄层原位修复复合材料及其制备方法 (High-flexibility thin-layer in-situ repair composite material and preparation method thereof ) 是由 王娟 龙天艳 陈宁 董庆广 赵立群 付杰 于 2021-08-16 设计创作，主要内容包括：本发明提供了一种高柔韧型薄层原位修复复合材料及其制备方法,其中,该材料包括修复材料和二维纤维增强材料,所述修复材料由以下重量配比的组分组成：普通硅酸盐水泥200-400份,河砂600-800份,保水增稠剂1-2份,聚合物乳液100-200份,水120-280份；其中液粉比为0.24-0.40,胶砂比为0.25-0.67。本发明制备得的薄层原位修复复合材料能够有效提升修复材料的拉伸强度和柔韧性。(The invention provides a high-flexibility thin-layer in-situ repair composite material and a preparation method thereof, wherein the material comprises a repair material and a two-dimensional fiber reinforced material, and the repair material comprises the following components in parts by weight: 400 portions of ordinary Portland cement, 800 portions of river sand, 1-2 portions of water retention thickening agent, 200 portions of polymer emulsion and 280 portions of water; wherein the liquid-powder ratio is 0.24-0.40, and the sand-glue ratio is 0.25-0.67. The thin-layer in-situ repair composite material prepared by the method can effectively improve the tensile strength and flexibility of the repair material.)

1. The high-flexibility thin-layer in-situ repair composite material is characterized by comprising a repair material and a two-dimensional fiber reinforced material, wherein the repair material is composed of the following components in parts by weight:

400 portions of ordinary Portland cement, 800 portions of river sand, 1-2 portions of water retention thickening agent, 200 portions of polymer emulsion and 280 portions of water; wherein the liquid-powder ratio is 0.24-0.40, and the sand-glue ratio is 0.25-0.67.

2. The thin layer in situ repair composite of claim 1, wherein the two-dimensional fiber reinforcement material is one of an alkali-resistant glass fiber web, a scrim, and a fiber mat.

3. The high-flexibility thin-layer in-situ repair composite material as claimed in claim 1, wherein the polymer emulsion is one or more of butylbenzene emulsion, pure acrylic emulsion and styrene-acrylic emulsion.

4. The thin layer in situ healing composite of high flexibility as claimed in claim 1, wherein said water retention thickener is cellulose ether with viscosity 20000-40000 mPa-s.

5. The high-flexibility thin-layer in-situ repair composite material as claimed in claim 1, wherein the repair material is composed of the following components in parts by weight: 300 parts of ordinary portland cement, 698 parts of river sand, 2 parts of a water-retaining thickener, 100 parts of polymer emulsion and 150 parts of water, wherein the liquid-powder ratio is 0.25, and the mortar ratio is 0.43.

6. A method for preparing the high-flexibility thin-layer in-situ repair composite material as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps:

(1) mixing ordinary portland cement, river sand and a water-retaining thickener according to a proportion, and dry-mixing for 5-8 minutes;

(2) mixing the polymer emulsion and water in proportion for 3-5 minutes;

(3) mixing the liquid and the powder in proportion, and stirring for 3-5 minutes; obtaining a repairing material;

(4) when 1 layer of two-dimensional fiber reinforced material is built in, firstly forming a film of the repair material obtained in the step (3) with the thickness of 1-2mm on a base material, then covering 1 layer of two-dimensional fiber reinforced material, and then forming the repair material obtained in the step (3) on the surface of the two-dimensional fiber reinforced material, wherein the total thickness of the repair composite material is controlled to be 2.5-3 mm;

when 2 layers of two-dimensional fiber reinforced materials are built in, a layer of repair material obtained in the step (3) is thinly smeared after a layer of 1 two-dimensional fiber reinforced material is coated, a layer of 2 two-dimensional fiber reinforced material is coated, then the repair material obtained in the step (3) is formed on the surface of the layer of 2 two-dimensional fiber reinforced material, and the total thickness of the repair composite material is controlled to be 2.5-3 mm.

7. The method according to claim 6, wherein in the step (4), the total thickness of the composite material is controlled to be 3 mm.

Technical Field

The invention relates to the field of organic renewal materials of existing buildings, in particular to a high-flexibility thin-layer in-situ repair composite material and a preparation method thereof.

Background

The data of the national statistical bureau show that the building construction area of the Chinese building industry is accumulated to 1506.2 hundred million square meters in 2000 to 2019, and in recent years, due to natural aging, design, accidental damage and the like, the building is often damaged by cracks, hollows, falling and the like, so that the normal use of the building is influenced, in addition, the service period of part of the existing building enclosure system reaches 60-80% of the designed service life, and the potential safety risk of durability failure such as hollows, falling and the like is also faced. The national housing and urban and rural construction department proposes that 3.9 thousands of old cells in cities and towns are planned to be transformed in all regions in 2020, which is doubled compared with 2019. The method has great significance for reasonably transforming, renovating and improving the quality of the existing building outer wall enclosure system with large and wide range, is necessary requirements for preventing safety risk and adhering to the bottom line thinking, and is also important content for organic updating and sustainable development of cities.

The thin-layer in-situ repair technology adopted in the prior art is a repair technology introduced by Japan and has the advantages of safety, durability, environmental protection, no disturbance to people, economy, reasonableness and the like, and similarly, the thin-layer in-situ repair material applied in the repair technology is also an organic type newer material introduced by Japan, has the characteristics of aging resistance time of more than 1500h, high composite tensile strength and flexible construction, and has further improved space for tensile strength and flexibility although being popularized and applied in a plurality of repair projects.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects in the prior art and provide a high-flexibility thin-layer in-situ repair composite material with higher tensile strength and better flexibility.

The technical problem to be solved can be implemented by the following technical scheme.

The high-flexibility thin-layer in-situ repair composite material is characterized by comprising a repair material and a two-dimensional fiber reinforced material, wherein the repair material comprises the following components in parts by weight:

400 portions of ordinary Portland cement, 800 portions of river sand, 1-2 portions of water retention thickening agent, 200 portions of polymer emulsion and 280 portions of water; wherein the liquid-powder ratio is 0.24-0.40, and the sand-glue ratio is 0.25-0.67.

As a further improvement of the technical scheme, the two-dimensional fiber reinforced material is one of an alkali-resistant glass fiber net, a piece of check cloth and a fiber felt.

As one of the preferable embodiments of the invention, the polymer emulsion is one or more of butylbenzene emulsion, pure acrylic emulsion and styrene-acrylic emulsion.

Also as one of the preferred embodiments of the present invention, the water retention thickener is a cellulose ether having a viscosity of 20000-.

As a preferred form of the invention, the repair material consists of the following components in parts by weight: 300 parts of ordinary portland cement, 698 parts of river sand, 2 parts of a water-retaining thickener, 100 parts of polymer emulsion and 150 parts of water, wherein the liquid-powder ratio is 0.25, and the mortar ratio is 0.43.

Another technical problem to be solved by the present invention is to provide a method for preparing the aforementioned high-flexibility thin-layer in-situ repair composite material, which includes the following steps:

(1) mixing ordinary portland cement, river sand and a water-retaining thickener according to a proportion, and dry-mixing for 5-8 minutes;

(2) mixing the polymer emulsion and water in proportion for 3-5 minutes;

(3) mixing the liquid and the powder in proportion, and stirring for 3-5 minutes; obtaining a repairing material;

(4) and when 1 layer of two-dimensional fiber reinforced material is built in, firstly forming a film of the repair material obtained in the step (3) with the thickness of 1-2mm on the base material, then covering 1 layer of two-dimensional fiber reinforced material, and then forming the repair material obtained in the step (3) on the surface of the two-dimensional fiber reinforced material, wherein the total thickness of the repair composite material is controlled to be 2.5-3mm (preferably 3 mm).

When 2 layers of two-dimensional fiber reinforced materials are internally arranged, a layer of repair material obtained in the step (3) is thinly smeared after a layer of two-dimensional fiber reinforced material 1 is coated, a layer of two-dimensional fiber reinforced material 2 is coated, then the repair material obtained in the step (3) is formed on the surface of the two-dimensional fiber reinforced material 2, and the total thickness of the repair composite material is controlled to be 2.5-3mm (preferably 3 mm).

In effect, compared with the existing repair material, the high-flexibility in-situ repair material for the outer wall thin layer of the existing building, provided by the invention, has the characteristics of more reasonable economy and more superior performance, and the expected achievement has stronger market competitiveness. The method has significant advantages mainly in the following aspects: (1) the tensile strength is more than 25MPa, the tensile strength is greatly improved compared with the prior Japanese technology, and the elongation at break is more than 5 percent; (2) the transverse deformation is more than 30mm, and the flexibility is better. Namely, the thin-layer in-situ repair composite material prepared by the method can effectively improve the tensile strength and flexibility of the repair material.

The thin-layer in-situ repair composite material with high tensile strength, high flexibility and high bonding force is formed by compounding the repair material and the two-dimensional fiber reinforced material, the type and the mixing amount of the polymer emulsion and the type and the layer number of the two-dimensional fiber reinforced material can be adjusted according to the use occasion to perform reinforcement and toughening, and the construction performance can be adjusted according to the use occasion and the use requirement. The thin-layer in-situ repair composite material is mainly applied to the field of organic renewal of existing buildings, and can also be used for concrete repair, reinforcement and toughening in structural engineering in the fields of roads, bridges, tunnels, hydraulic engineering and underground engineering.

Drawings

FIG. 1 is a graph showing stress-strain curves of examples 1 to 6 of the present invention.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Example 1

1) The repair material comprises the following components in parts by weight: 300 parts of ordinary portland cement, 698 parts of river sand, 1.5 parts of cellulose ether with the viscosity of 40000mPa & s, 100 parts of butylbenzene emulsion and 150 parts of water, wherein the liquid-powder ratio is 0.25, and the mortar ratio is 0.43.

2) The two-dimensional fiber reinforced material is 1 layer of alkali-resistant glass fiber net.

3) The preparation method of the repair composite material comprises the following steps:

(1) mixing ordinary portland cement, river sand and a water-retaining thickener (cellulose ether) in proportion, and dry-mixing for 5 minutes;

(2) mixing the butylbenzene emulsion and water in proportion for 4 minutes;

(3) mixing the liquid and the powder in proportion, and stirring for 4 minutes to obtain a repair material;

(4) and (3) firstly forming a film of the repairing material obtained in the step (3) with the thickness of 1.5mm on a base material, then covering 1 layer of alkali-resistant glass fiber net, and then forming the repairing material obtained in the step (3) on the surface of the alkali-resistant glass fiber net, wherein the total thickness of the repairing composite material is controlled to be 3 mm.

Example 2

1) The repair material comprises the following components in parts by weight: 200 parts of ordinary Portland cement, 798 parts of river sand, 2 parts of cellulose ether with the viscosity of 40000mPa & s, 200 parts of butylbenzene emulsion and 140 parts of water, wherein the liquid-powder ratio is 0.24, and the mortar ratio is 0.25.

2) The two-dimensional fiber reinforced material is 1 layer of checkered cloth.

3) The preparation method of the repair composite material comprises the following steps:

(1) mixing ordinary portland cement, river sand and a water-retaining thickener (cellulose ether) in proportion, and dry-mixing for 8 minutes;

(2) mixing the butylbenzene emulsion and water in proportion for 4 minutes;

(3) mixing the liquid and the powder in proportion, and stirring for 5 minutes; obtaining a repairing material;

(4) and (3) firstly forming a film of the repair material obtained in the step (3) with the thickness of 1mm on a base material, then covering 1 layer of checked cloth, and then forming the repair material obtained in the step (3) on the surface of the checked cloth, wherein the total thickness of the repair composite material is controlled to be 3 mm.

Example 3

1) The repair material comprises the following components in parts by weight: 400 parts of ordinary portland cement, 598 parts of river sand, 2 parts of cellulose ether with the viscosity of 20000 mPa.s, 100 parts of pure acrylic emulsion, 100 parts of styrene-acrylic emulsion and 120 parts of water, wherein the liquid-powder ratio is 0.32, and the glue-sand ratio is 0.67.

2) The two-dimensional fibrous reinforcement is 1 layer of fiber mat.

3) The preparation method of the repair composite material comprises the following steps:

(1) mixing ordinary portland cement, river sand and a water-retaining thickener (cellulose ether) in proportion, and dry-mixing for 6 minutes;

(2) mixing the styrene-acrylic emulsion, the pure acrylic emulsion and water in proportion for 5 minutes;

(3) mixing the liquid and the powder in proportion, and stirring for 5 minutes; obtaining a repairing material;

(4) and (3) firstly forming a film of the repair material obtained in the step (3) with the thickness of 1.5mm on a base material, then covering 1 layer of fiber felt, and then forming the repair material obtained in the step (3) on the surface of the fiber felt, wherein the total thickness of the repair composite material is controlled to be 3 mm.

Example 4

1) The repair material comprises the following components in parts by weight: 300 parts of ordinary portland cement, 698 parts of river sand, 1.5 parts of cellulose ether with the viscosity of 40000mPa & s, 100 parts of butylbenzene emulsion and 280 parts of water, wherein the liquid-powder ratio is 0.25, and the mortar ratio is 0.43.

2) The two-dimensional fiber reinforced material is 2 layers of alkali-resistant glass fiber net.

3) The preparation method of the repair composite material comprises the following steps:

(1) mixing ordinary portland cement, river sand and a water-retaining thickener (cellulose ether) in proportion, and dry-mixing for 5 minutes;

(2) mixing the butylbenzene emulsion and water in proportion for 5 minutes;

(3) mixing the liquid and the powder in proportion, and stirring for 5 minutes; obtaining a repairing material;

(4) firstly, forming a film of the repair material obtained in the step (3) with the thickness of 1mm on a base material, covering a 1 st layer of alkali-resistant glass fiber net, controlling the thickness of the repair material obtained in the step (3) to be 2mm on the surface of the alkali-resistant glass fiber net, covering a 2 nd layer of alkali-resistant glass fiber net, controlling the total thickness of the repair material obtained in the step (3) on the surface of the alkali-resistant glass fiber net to be 3 mm.

Example 5

1) The repair material comprises the following components in parts by weight: 200 parts of ordinary portland cement, 798 parts of river sand, 2 parts of cellulose ether with the viscosity of 40000mPa & s, 100 parts of styrene-acrylic emulsion, 100 parts of pure acrylic emulsion and 140 parts of water, wherein the liquid-powder ratio is 0.24, and the glue-sand ratio is 0.25.

2) The two-dimensional fiber reinforced material is 2 layers of checked cloth.

3) The preparation method of the repair composite material comprises the following steps:

(1) mixing ordinary portland cement, river sand and a water-retaining thickener (cellulose ether) in proportion, and dry-mixing for 8 minutes;

(2) mixing the styrene-acrylic emulsion, the pure acrylic emulsion and water in proportion for 5 minutes;

(3) mixing the liquid and the powder in proportion, and stirring for 4 minutes; obtaining a repairing material;

(4) and (3) firstly forming a film of the repair material obtained in the step (3) with the thickness of 1mm on a base material, covering the 1 st layer of check cloth, forming the repair material obtained in the step (3) on the surface of the check cloth, controlling the thickness to be 2mm, covering the 2 nd layer of check cloth, forming the repair material obtained in the step (3) on the surface of the check cloth, and controlling the total thickness of the repair composite material to be 3 mm.

Example 6

1) The repair material comprises the following components in parts by weight: 400 parts of ordinary portland cement, 598 parts of river sand, 1 part of cellulose ether with the viscosity of 20000 Pa.s, 200 parts of butylbenzene emulsion and 200 parts of water, wherein the liquid-powder ratio is 0.32, and the rubber-sand ratio is 0.67.

2) The two-dimensional fibrous reinforcement is a 2-ply fiber mat.

3) The preparation method of the repair composite material comprises the following steps:

(1) mixing ordinary portland cement, river sand and a water-retaining thickener (cellulose ether) in proportion, and dry-mixing for 6 minutes;

(2) mixing the butylbenzene emulsion and water in proportion for 3 minutes;

(3) mixing the liquid and the powder in proportion, and stirring for 3 minutes; obtaining a repairing material;

(4) firstly, forming a film of the repair material obtained in the step (3) with the thickness of 1mm on a base material, covering a 1 st layer of fiber felt, forming the repair material obtained in the step (3) on the surface of the fiber felt, controlling the thickness to be 2mm, covering a 2 nd layer of fiber felt, forming the repair material obtained in the step (3) on the surface of the fiber felt, and controlling the total thickness of the repair composite material to be 3 mm.

The properties of the materials obtained in examples 1 to 6 are shown in Table 1 below.

Table 1:

the tensile strength data shows that the repair composite material provided by the invention has higher tensile bearing capacity, and the transverse deformation data shows that the repair composite material has excellent flexibility.