阅读说明：本技术 一种具有防水层结构的低吸水率固废泡沫混凝土及其制备方法 (Low-water-absorption solid waste foam concrete with waterproof layer structure and preparation method thereof ) 是由 郝向阳 张以河 李慧琴 魏琦 尚洁 张伟璇 杨智航 吴越阳 吴宣卓 吴帆 张�杰 于 2020-11-11 设计创作，主要内容包括：本发明总体地涉及防水涂料技术领域,具体地涉及一种具有防水层结构的低吸水率固废泡沫混凝土,包括固废泡沫混凝土本体(1)和防水层结构,其中防水层结构包括从所述固废泡沫混凝土本体(1)的表面向外依次设置的聚合物水泥防水层(2)、渗透结晶型防水层(3)、氯丁胶乳与乙烯－醋酸乙烯酯共聚物复配成的聚合物乳液防水层(4)、单组分水性防水层(5)。本发明的防水层结构中的各层在固废泡沫混凝土本体表面依次涂覆形成,形成防水加疏水的体系,显著降低固废泡沫混凝土的吸水率。(The invention relates to the technical field of waterproof coatings in general, and particularly relates to low-water-absorption solid waste foam concrete with a waterproof layer structure, which comprises a solid waste foam concrete body (1) and the waterproof layer structure, wherein the waterproof layer structure comprises a polymer cement waterproof layer (2), a permeable crystallization type waterproof layer (3), a polymer emulsion waterproof layer (4) compounded by neoprene latex and ethylene-vinyl acetate copolymer and a single-component water-based waterproof layer (5) which are sequentially arranged from the surface of the solid waste foam concrete body (1) to the outside. The waterproof layer structure is formed by sequentially coating all layers on the surface of the solid waste foam concrete body to form a waterproof and hydrophobic system, so that the water absorption rate of the solid waste foam concrete is obviously reduced.)

1. The low-water-absorption solid waste foam concrete with the waterproof layer structure comprises a solid waste foam concrete body (1) and the waterproof layer structure arranged on the surface of the solid waste foam concrete body (1), and is characterized in that the waterproof layer structure comprises a polymer cement waterproof layer (2), an infiltration crystallization type waterproof layer (3), a polymer emulsion waterproof layer (4) and a single-component water-based waterproof layer (5) which are sequentially arranged outwards from the surface of the solid waste foam concrete body (1), and the total thickness of the low-water-absorption solid waste foam concrete with the waterproof layer structure is 5-6 mm.

2. The low water absorption solid waste foam concrete with waterproof layer structure of claim 1,

the polymer cement waterproof layer (2) is prepared by mixing the following raw materials in percentage by mass: 79% of self-leveling cement, 0.6% of methyl cellulose ether, 1.4% of organosilicon hydrophobic powder and 19% of polymer emulsion;

the polymer emulsion is compounded by neoprene latex and ethylene-vinyl acetate copolymer, and the mass ratio range of the neoprene latex and the ethylene-vinyl acetate copolymer is as follows: (10-5): (5-1);

the thickness of the polymer cement waterproof layer (2) is 2.0-2.5 mm.

3. The low water absorption solid waste foam concrete with waterproof layer structure according to claim 1, characterized in that the raw materials of the capillary crystalline waterproof layer (3) comprise organosilicon waterproof agent, amorphous silica colloid solution, surfactant, barium hydroxide and water; the thickness of the permeable crystallization type waterproof layer (3) is 0.8-1.2 mm.

4. The low water absorption solid waste foam concrete with waterproof layer structure of claim 1,

the polymer emulsion waterproof layer is prepared from neoprene latex and ethylene-vinyl acetate copolymer, and the mass ratio range of the neoprene latex and the ethylene-vinyl acetate copolymer in compounding is as follows: (10-5): (5-1);

the thickness of the polymer emulsion waterproof layer (4) is 0.8-1.2 mm.

5. The low water absorption solid waste foam concrete with waterproof layer structure of claim 1, characterized in that the single-component aqueous waterproof layer (5) is prepared by taking butylbenzene emulsion as a base material and adding one or more of filler and auxiliary agent, wherein the filler is one or more of calcium carbonate, quartz powder and talcum powder, and the auxiliary agent is one or more of defoaming agent, dispersing agent and thickening agent; the thickness of the single-component aqueous environment-friendly high-elastic waterproof layer (5) is 1.0-1.5 mm.

6. Method for the preparation of low water absorption solid waste foam concrete with waterproof layer structure according to any of claims 1-5, characterized in that it comprises the following steps:

s1, surface pretreatment: firstly, polishing each surface of the solid waste foam concrete by using 180# abrasive paper, and then brushing off dust on the surface by using a soft brush;

s2, coating and curing the polymer cement waterproof layer (2): uniformly coating slurry formed by mixing polymer cement waterproof layer raw materials on the surface of the solid waste foam concrete, and maintaining for 2-4 days;

s3, coating and curing the capillary crystalline waterproof layer (3): polishing the surface of the polymer cement waterproof layer (2) obtained in the step S2 by using 180# coarse sand paper, then polishing by using 300# fine sand paper, then brushing off the dust on the polished surface, then coating the slurry prepared by the raw material of the permeable crystallization type waterproof layer on the treated surface, uniformly coating twice, and maintaining for 1-2 days in the middle of each time;

s4, coating and curing a polymer emulsion waterproof layer (4) prepared from neoprene latex and ethylene-vinyl acetate copolymer: coating polymer emulsion slurry prepared by neoprene latex and ethylene-vinyl acetate copolymer on the upper surface of the permeable crystallization type waterproof layer (3) obtained in the step S3 by using a brush, and uniformly coating twice, wherein the middle of each time is maintained for 1-2 days;

s5, coating and curing the single-component water-based waterproof layer (5): and (4) coating slurry formed by single-component water-based waterproof layer raw materials on the upper surface of the polymer emulsion waterproof layer (4) prepared by the neoprene latex and the ethylene-vinyl acetate copolymer obtained in the step S4 by using a brush, uniformly coating twice, performing middle curing for 1-2 days each time to finish all waterproof layer structures, and performing curing for 14 days.

7. The method for preparing low water absorption solid waste foam concrete with waterproof layer structure according to claim 6, wherein said curing in steps S2-S5 is drying in an environment with relative humidity not more than 65% and temperature between 20-35 ℃.

8. The method for preparing low water absorption solid waste foam concrete with waterproof layer structure according to claim 7, wherein the solid waste foam concrete in step S1 is solid waste foam concrete section formed by molding and curing the solid waste foam concrete building material for 28 d; the used old solid waste foam concrete needs to be cleaned of outer layer dust and dirt before the pretreatment of step S1.

Technical Field

The invention relates to the technical field of waterproof coatings, in particular to low-water-absorption solid waste foam concrete with a waterproof layer structure and a preparation method thereof.

Background

The solid waste foam concrete has the advantages of light weight, heat preservation, heat insulation, flame retardance, environmental protection and the like, and has wide application prospect in the aspects of heat preservation, sound insulation and the like. The solid waste foam concrete material has high water absorption, such as density, pore structure and infiltration mechanism of the solid waste foam concrete. The main reasons influencing the large-scale application of the solid waste foam concrete are that the foam concrete is easy to absorb water and has low strength. The solid waste foam concrete is easy to absorb water mainly because capillary pores permeate and absorb water and communicating pores inside the solid waste foam concrete permeate and absorb water, so that the solid waste foam concrete is high in water absorption rate and extremely poor in waterproof performance, the problems of water seepage, water leakage and the like are easy to occur in the practical application and construction process, and the service life of building materials is seriously influenced. This problem is also a general problem with foamed concrete materials.

Disclosure of Invention

The invention aims to overcome the defect of high water absorption of the existing solid waste foam concrete, and provides the low water absorption solid waste foam concrete with the waterproof layer structure and the preparation method thereof.

In order to solve the technical problems, the invention provides the following technical scheme: the low-water-absorption solid waste foam concrete with the waterproof layer structure comprises a solid waste foam concrete body and the waterproof layer structure, wherein the waterproof layer structure comprises a polymer cement waterproof layer, a permeable crystallization type waterproof layer, a polymer emulsion waterproof layer and a single-component water-based waterproof layer which are sequentially arranged on the surface of the solid waste foam concrete body, and the total thickness of the low-water-absorption solid waste foam concrete with the waterproof layer structure is 5-6 mm.

Further, the polymer cement waterproof layer is prepared by mixing raw materials comprising self-leveling cement, methyl cellulose ether, organosilicon hydrophobic powder and polymer emulsion; the raw materials comprise the following components in percentage by mass: 79% of self-leveling cement, 0.6% of methyl cellulose ether, 1.4% of organosilicon hydrophobic powder and 19% of polymer emulsion, wherein the polymer emulsion is prepared by compounding neoprene latex and ethylene-vinyl acetate copolymer, and the mass ratio range of the neoprene latex and the ethylene-vinyl acetate copolymer is as follows: (10-5): (5-1); the thickness of the polymer cement waterproof layer is 2.0-2.5 mm.

Further, the thickness of the permeable crystallization type waterproof layer is 0.8-1.2 mm.

The raw materials of the capillary crystalline waterproof layer used in the invention comprise an organic silicon waterproof agent; colloidal solution of amorphous silica; a surfactant; barium hydroxide and water, etc. The water-proof agent is a combination of organic and inorganic materials, has the characteristics of strong permeability, good hydrophobicity, low water absorption, environmental protection and harmlessness, can permeate into concrete pores to form a large number of insoluble crystals to block the concrete pores, can reduce the damage of sulfate to the concrete, and plays a role in water prevention and protection.

Furthermore, the thickness of the polymer emulsion waterproof layer prepared from the neoprene latex and the ethylene-vinyl acetate copolymer is 0.8-1.2 mm.

Further, the main component of the single-component water-based waterproof layer is styrene-butadiene emulsion; the thickness of the single-component aqueous environment-friendly high-elastic waterproof layer is 1.0-1.5 mm.

The single-component aqueous environment-friendly high-elasticity waterproof layer is prepared by taking emulsion as a base material and assisting with filler and auxiliary agent, wherein the emulsion is styrene-butadiene emulsion, the filler is one or a combination of more of calcium carbonate, quartz powder and talcum powder, and the auxiliary agent is one or more of defoaming agent, dispersing agent and thickening agent.

The invention also provides a preparation method of the low-water absorption solid waste foam concrete with the waterproof layer structure, which comprises the following steps:

s1, surface pretreatment: firstly, grinding each surface of the solid waste foam concrete by using 180# abrasive paper, and then brushing off dust on the surface by using a brush;

s2, coating and maintaining the polymer cement waterproof layer: uniformly coating slurry formed by mixing polymer cement waterproof layer raw materials on the surface of the solid waste foam concrete, and maintaining for 2-4 days;

s3, coating and maintaining the capillary crystalline waterproof layer: firstly, polishing the surface of the polymer cement waterproof layer obtained in the step S2 by using 180# coarse sand paper, then polishing by using 300# fine sand paper, then brushing off dust on the polished surface by using a brush, then coating slurry prepared by a raw material of a permeable crystalline waterproof layer on the polished and ash-brushed surface, uniformly coating twice, and maintaining for 1-2 days in the middle of each time;

s4, coating and curing a polymer emulsion waterproof layer prepared from neoprene latex and ethylene-vinyl acetate copolymer: coating the upper surface of the permeable crystallization type waterproof layer obtained in the step S3 with polymer emulsion slurry prepared from neoprene latex and ethylene-vinyl acetate copolymer by using a brush, uniformly coating twice, and maintaining for 1-2 days in the middle of each time;

s5, coating and curing the single-component water-based waterproof layer: and (4) coating slurry formed by single-component water-based waterproof layer raw materials on the upper surface of the polymer emulsion waterproof layer prepared by the neoprene latex and the ethylene-vinyl acetate copolymer obtained in the step S4 by using a brush, uniformly coating twice, curing for 1-2 days in the middle of each time to finish all waterproof layer structures, and curing for 14 days.

Further, the curing in the steps S2-S5 refers to drying in an environment with a relative humidity of not more than 65% and a temperature between 20 ℃ and 35 ℃.

Further, the solid waste foam concrete in the step S1 is a solid waste foam concrete profile formed by molding and maintaining a solid waste foam concrete building material for 28 days; the used old solid waste foam concrete needs to be cleaned of outer layer dust and dirt before the pretreatment of step S1.

The invention has the beneficial effects that:

the structure of the invention comprises a solid waste foam concrete body and a multilayer waterproof layer coated outside the body: the polymer cement waterproof layer is coated on the surface of the solid waste foam concrete sample block to serve as a basic waterproof layer, so that the solid waste foam concrete matrix is bonded, and macroscopic large holes on the surface of the matrix are blocked; the permeable crystallization type waterproof layer is coated on the upper surface of the polymer cement waterproof layer, and the active components contained in the coating react with free unhydrated cement particles in the solid waste foam mixed soil to generate insoluble needle-shaped particles which block capillary pipelines and cracks, can be constructed under the condition of water seepage, can resist seepage for a long time, is permeable and crystallized in the concrete, is not easy to damage, has good self-healing capability, achieves the self-waterproof effect of the concrete, and has the same service life as the concrete structure; a polymer emulsion waterproof layer prepared from neoprene latex and ethylene-vinyl acetate copolymer is coated on the upper surface of the permeable crystallization type waterproof layer, the emulsion can be used for rapidly slowing down the hydration process of cement, so that a cement hydration product and the emulsion are interacted, a film is formed by solidification, and a solid waste foam concrete body is wrapped; the water-based waterproof layer is formed by forming a continuous compact waterproof film on the surface of the third waterproof film, and completely coating the solid waste foam concrete to achieve the effect of isolating the invasion of external moisture. Meanwhile, the preparation method is simple and reasonable to operate.

The low-water-absorption solid waste foam concrete with the waterproof layer structure has the remarkably reduced absorption rate, and compared with the solid waste foam concrete without the waterproof layer structure, the low-water-absorption solid waste foam concrete with the waterproof layer structure can realize that the mass water absorption rate is reduced from 60% to 0.50%, and the reduction amplitude is 99.17%; the contact angle of the surface of the waterproof layer of the low-water-absorption solid waste foam concrete with the waterproof layer structure can reach 114.87 degrees, the waterproof layer has excellent hydrophobicity, and the effect of remarkably reducing the water absorption of the solid waste foam concrete is achieved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

In the drawings:

FIG. 1 is a schematic structural diagram of a low water absorption solid waste foam concrete with a waterproof layer structure according to an embodiment of the present invention;

reference numbers in the figures: 1-solidifying waste foam concrete body; 2-a polymer cement waterproof layer; 3-infiltration crystallization waterproof layer; 4-neoprene latex and ethylene-vinyl acetate copolymer to prepare polymer latex waterproof layer; 5-single-component water-based environment-friendly high-elastic waterproof layer.

FIG. 2 is a contact angle test chart of the surface of solid waste foam concrete with waterproof layer structure according to the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Example 1

A low-water absorption solid waste foam concrete with a waterproof layer structure is shown in figure 1 and comprises a solid waste foam concrete body 1, a polymer cement waterproof layer 2 arranged on the upper surface of the solid waste foam concrete body, a permeable crystallization type waterproof layer 3 arranged on the upper surface of the polymer cement waterproof layer 2, a polymer emulsion waterproof layer 4 prepared from neoprene latex and ethylene-vinyl acetate copolymer arranged on the upper surface of the permeable crystallization type waterproof layer 3, and a single-component water-based waterproof layer 5 arranged on the upper surface of the polymer emulsion waterproof layer 4 prepared from the neoprene latex and the ethylene-vinyl acetate copolymer, wherein the thickness of the first polymer cement waterproof layer 2 is 2.5 mm. The thickness of the second permeable crystallization type waterproof layer 3 is 1.0 mm; the thickness of a polymer emulsion waterproof layer 4 prepared by the third layer of neoprene latex and ethylene-vinyl acetate copolymer is 1.0 mm; the thickness of the fourth layer of single-component water-based environment-friendly high-elastic waterproof layer 5 is 1.2 mm.

The contact angle test result of the surface of the waterproof layer of the low-water-absorption solid waste foam concrete with the waterproof layer structure is 114.87 degrees as shown in figure 2, the waterproof layer has excellent hydrophobicity, and the effect of remarkably reducing the water absorption of the solid waste foam concrete is achieved.

The invention overcomes the defect of high water absorption of the existing solid waste foam concrete, has simple and reasonable structure, convenient operation, layered coating and multi-layer protection, and can form a complete hydrophobic waterproof layer on the surface of the solid waste foam concrete so as to obviously reduce the water absorption of the solid waste foam concrete.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.