阅读说明：本技术 一种施工简便、柔韧性好的修复材料及其制备方法 (Repair material with simple construction and good flexibility and preparation method thereof ) 是由 龙天艳 王娟 陈宁 董庆广 赵立群 付杰 于 2021-08-18 设计创作，主要内容包括：本发明提供一种施工简便、柔韧性好的修复材料,以质量份数计,其包括：胶凝材料300～500份,细骨料500～700份,保水增稠剂1～3份,聚合物乳液300～400份,减水剂2～3份,水60～100份,其中液固比为0.36～0.44,粉骨比为0.43～1.00。本发明的修复材料施工性能良好、柔韧性好,可根据使用场景采取滚涂或涂刷工艺施工,施工后的修复材料厚度均匀、表面平整,因此可显著提高施工速度和施工质量。通过聚合物改性技术研制高柔韧性的修复材料,断裂伸长率大于8％,较现有材料提升60％以上,可适应因墙体变形、风压及温度应力等因素引起的变形。本发明提出的建筑修复材料主要应用于既有建筑的有机更新领域,也可用于道路、桥梁、隧道等领域中的混凝土修补。(The invention provides a repair material with simple and convenient construction and good flexibility, which comprises the following components in parts by mass: 300-500 parts of a cementing material, 500-700 parts of fine aggregate, 1-3 parts of a water-retaining thickener, 300-400 parts of a polymer emulsion, 2-3 parts of a water reducing agent and 60-100 parts of water, wherein the liquid-solid ratio is 0.36-0.44, and the powder-bone ratio is 0.43-1.00. The repairing material has good construction performance and good flexibility, can be constructed by adopting a roll coating or brushing process according to a use scene, and has uniform thickness and flat surface after construction, so that the construction speed and the construction quality can be obviously improved. The high-flexibility repair material is developed by a polymer modification technology, the elongation at break is more than 8%, and the material is improved by more than 60% compared with the existing material, and can adapt to deformation caused by factors such as wall deformation, wind pressure, temperature stress and the like. The building repair material provided by the invention is mainly applied to the field of organic updating of existing buildings, and can also be used for concrete repair in the fields of roads, bridges, tunnels and the like.)

1. The repair material is simple and convenient to construct and good in flexibility, and is characterized by comprising the following components in parts by mass: 300-500 parts of a cementing material, 500-700 parts of fine aggregate, 1-3 parts of a water-retaining thickener, 300-400 parts of a polymer emulsion, 2-3 parts of a water reducing agent and 60-100 parts of water, wherein the liquid-solid ratio is 0.36-0.44, and the powder-bone ratio is 0.43-1.00.

2. The repair material of claim 1 wherein the cementitious material comprises cement and a mineral admixture, the mineral admixture being one of fly ash, silica fume, and mineral fines.

3. The repair material according to claim 1, wherein the fine aggregate is river sand or machine-made sand having a particle size of 70 to 140 mesh.

4. Repair material according to claim 1, characterized in that the water-retaining thickener is a cellulose ether and/or a starch ether.

5. The repair material of claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent.

6. The repair material of claim 1 wherein the polymer emulsion is one or more of a styrene-butadiene emulsion, a pure acrylic emulsion, and a styrene-acrylic emulsion.

7. A method for preparing a repair material according to any one of claims 1 to 6, comprising the steps of:

(1) uniformly mixing the polymer emulsion and water in proportion by using a high-speed stirrer to obtain a mixed solution;

(2) uniformly mixing the cementing material, the water-retaining thickener and the fine aggregate in proportion by using a stirrer to obtain mixed powder;

(3) adding the mixed powder prepared in the step (2) into the mixed liquid prepared in the step (1), adding a water reducing agent in proportion during stirring, and continuously and uniformly mixing to obtain a repair material;

the sequence of the step (1) and the step (2) can be exchanged.

8. The method for preparing a repair material according to claim 7, wherein in the step (1), the stirring speed of the high-speed stirrer is set to 400 to 600 r/min.

9. The method for preparing a repair material according to claim 7, wherein the time for stirring the mixed powder in the step (2) is 5 to 10 min.

10. The preparation method of the repair material according to claim 7, wherein the stirring time of the high-flexibility in-situ repair material for the building exterior wall thin layer in the step (3) is 3-5 min.

Technical Field

The invention relates to the technical field of building materials, in particular to a repair material with simple and convenient construction and good flexibility and a preparation method thereof.

Background

With the advance of urbanization process, incremental expansion of buildings is gradually changed into stock updating, and organic updating of existing buildings becomes an important issue for urban planning and construction. Meanwhile, due to the reasons of natural aging, design, accidental damage and the like and the fact that the service life of part of the existing building enclosure system reaches 60% -80% of the design service life, the buildings often have potential safety risks of durability failure such as cracks, hollowing, falling and the like. The repair of the building outer wall becomes a current research hotspot, and the repair material naturally becomes an important research direction.

In recent years, in-situ thin layer repair is widely applied to practical engineering due to the advantages of no detachment or few shoveling, environmental protection and no disturbance to people, but at present, the repair material is used as the most important component, the flexibility of the repair material still has a space for improving, and the capability of resisting displacement caused by wall deformation, wind pressure, temperature stress and the like needs to be further improved.

Disclosure of Invention

In view of the above, the invention aims to provide a repair material with simple construction and good flexibility and a preparation method thereof. Compared with the existing repair material, the material has the characteristics of high construction efficiency, good flexibility, good durability, economy, reasonability and the like.

The invention provides a repair material with simple and convenient construction and good flexibility, which comprises the following components in parts by mass: 300-500 parts of a cementing material, 500-700 parts of fine aggregate, 1-3 parts of a water-retaining thickener, 300-400 parts of a polymer emulsion, 2-3 parts of a water reducing agent and 60-100 parts of water, wherein the liquid-solid ratio is 0.36-0.44, and the powder-bone ratio is 0.43-1.00.

Preferably, the cementing material comprises cement and a mineral admixture, and the mineral admixture is one of fly ash, silica fume and mineral powder.

Preferably, the fine aggregate is river sand or machine-made sand with the particle size of 70-140 meshes.

Preferably, the water retention thickener is cellulose ether and/or starch ether.

Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.

Preferably, the polymer emulsion is one or more of butylbenzene emulsion, pure acrylic emulsion and styrene-acrylic emulsion.

The invention provides a preparation method of the building repair material, which comprises the following steps:

(1) uniformly mixing the polymer emulsion and water in proportion by using a high-speed stirrer to obtain a mixed solution;

(2) uniformly mixing the cementing material, the water-retaining thickener and the fine aggregate in proportion by using a stirrer to obtain mixed powder;

(3) adding the mixed powder prepared in the step (2) into the mixed liquid prepared in the step (1), adding a water reducing agent in proportion during stirring, and continuously and uniformly mixing to obtain a repair material;

the sequence of the step (1) and the step (2) can be exchanged.

Preferably, in the step (1), the stirring speed of the high-speed stirrer is set to be 400-600 r/min.

Preferably, the stirring time of the mixed powder in the step (2) is 5-10 min.

Preferably, the stirring time of the high-flexibility in-situ repair material for the building outer wall thin layer in the step (3) is 3-5 min.

Compared with the prior art, the repair material has good construction performance and good flexibility, can be constructed by adopting a roll coating or brushing process according to a use scene, and has uniform thickness and smooth surface after construction, so that the construction speed and the construction quality can be obviously improved. The high-flexibility repair material is developed by a polymer modification technology, the elongation at break is more than 8%, and the material is improved by more than 60% compared with the existing material, and can adapt to deformation caused by factors such as wall deformation, wind pressure, temperature stress and the like. The repair material provided by the invention is mainly applied to the field of organic updating of existing buildings, and can also be used for concrete repair in the fields of roads, bridges, tunnels and the like.

Detailed Description

The technical solution of the present invention is further illustrated by the following examples. The examples do not show the specific techniques or conditions, and the techniques described in the literature in the field or the product specifications are followed. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.

Example 1

A repair material with simple construction and good flexibility comprises the following components in parts by mass: 280 parts of P.042.5 cement, 20 parts of I-grade fly ash, 700 parts of 70-140-mesh river sand, 1 part of cellulose ether, 0.3 part of starch ether, 2 parts of water reducing agent, 300 parts of butylbenzene emulsion and 60 parts of water;

the preparation method comprises the following steps:

(1) and proportionally stirring the butylbenzene emulsion and water for 5min by using a high-speed stirrer at the rotating speed of 500r/min to obtain a mixed solution.

(2) And uniformly mixing the cement, the fly ash, the cellulose ether, the starch ether and the river sand for 6min by using a stirrer according to the proportion to obtain mixed powder.

(3) And (3) adding the mixed powder prepared in the step (2) into the mixed solution in the step (1), adding a water reducing agent in proportion in the stirring process, and continuously mixing for 5min to obtain the repair material.

Example 2

A repair material with simple construction and good flexibility comprises the following components in parts by mass: 330 parts of cement, 50 parts of silica fume, 650 parts of river sand, 2 parts of cellulose ether, 0.3 part of starch ether, 1.5 parts of water reducing agent, 150 parts of pure acrylic emulsion, 150 parts of styrene-acrylic emulsion and 100 parts of water;

the preparation method comprises the following steps:

(1) and stirring the pure acrylic emulsion, the styrene-acrylic emulsion and the water for 5min by a high-speed stirrer at the rotating speed of 500r/min according to the proportion to obtain a mixed solution.

(2) And uniformly mixing the cement, the silica fume, the cellulose ether, the starch ether and the river sand for 6min by using a stirrer according to the proportion to obtain mixed powder.

(3) And (3) adding the mixed powder prepared in the step (2) into the mixed solution in the step (1), adding a water reducing agent in proportion in the stirring process, and continuously mixing for 5min to obtain the repair material.

Example 3

A repair material with simple construction and good flexibility comprises the following components in parts by mass: 380 parts of cement, 100 parts of mineral powder, 500 parts of river sand, 1 part of cellulose ether, 1 part of water reducing agent, 400 parts of butylbenzene emulsion and 30 parts of water;

the preparation method comprises the following steps:

(1) and proportionally stirring the butylbenzene emulsion and water for 5min by a high-speed stirrer at the rotating speed of 500r/min to obtain a mixed solution.

(2) And uniformly mixing the cement, the mineral powder, the cellulose ether and the river sand for 6min by using a stirrer according to the proportion to obtain mixed powder.

(3) And (3) adding the mixed powder prepared in the step (2) into the mixed solution in the step (1), adding a water reducing agent in proportion in the stirring process, and continuously mixing for 5min to obtain the repair material.

And (3) performance testing: in order to show that the repair material prepared by the method has the characteristics of high mechanical strength and good flexibility after being cured, the repair material prepared by the embodiments 1-3 is subjected to a curing detection test, and the method specifically comprises the following steps:

tensile bond strength: the tensile bonding strength is checked according to GB/T23445-2009 (Polymer Cement waterproof paint), and the thickness of the repairing material is 3 mm.

Tensile strength: referring to section 9 of test method for waterproof roll for building: the tensile strength is tested by a method A in GB/T328.9-2007 tensile property of the high-molecular waterproof coiled material, and the thickness of a repair material sample is 3 mm.

Elongation at break: referring to section 9 of test method for waterproof roll for building: the method A in GB/T328.9-2007 of Polymer waterproof coiled material tensile property tests the elongation at break, and the thickness of the repair material sample is 3 mm. .

24h surface water absorption: according to appendix C of JG/T158-2013 of rubber powder polyphenyl particle external thermal insulation system material, the surface water absorption is checked, the base material is concrete, and the thickness of the repair material is 3 mm.

Specific detection results are shown in table 1:

TABLE 1

As can be seen from the above table, the repairing material prepared in the embodiments 1 to 3 of the present invention has excellent mechanical strength and good flexibility after curing. The roller coating or brushing process construction can be adopted according to the use scene, and the constructed repair material has uniform thickness and smooth surface, so that the construction speed and the construction quality can be obviously improved. In the embodiment 2, the high-flexibility repair material is developed by a polymer modification technology, the elongation at break is more than 8%, and is improved by more than 60% compared with the existing material, and deformation caused by wall deformation, wind pressure, temperature stress and other factors can be effectively resisted.

The repair material prepared by the invention can be widely applied to the field of organic updating of buildings, and can also be used for concrete repair in the fields of roads, bridges, tunnels and the like.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.