Construction method of high-strength self-leveling thermal insulation mortar floor insulation layer

Abstract

This invention discloses a construction method for a high-strength self-leveling thermal insulation mortar floor insulation layer, comprising the following steps: (1) preparation of thermal insulation mortar; (2) cleaning of the base surface: using a roughening machine to clean the base surface to be constructed, so that the base surface is flat and clean; (3) thickness control line: according to the design requirements, slope and line are drawn, and thickness control lines are marked on the walls around the base surface; (4) mortar construction: the prepared thermal insulation mortar is constructed, and the pouring thickness and flatness are controlled during the process; (5) curing: the completed mortar is cured to finally obtain the thermal insulation mortar floor insulation layer. This invention provides a convenient construction method and a relatively simple construction process. However, the final insulation layer has high strength, good crack resistance, is not easily deformed, and has a low probability of producing hollow areas and cracks, thus ensuring that the insulation layer has good application performance.

Description

Technical Field

[0001] This invention relates to the field of ground construction, specifically to a method for constructing a high-strength self-leveling thermal insulation mortar floor insulation layer. Background Technology

[0002] Concrete is one of the most important civil engineering materials in modern times. It is an artificial stone material made by mixing cementitious materials, granular aggregates (also known as aggregates), water, and, if necessary, admixtures and additives in a certain proportion, uniformly mixing, compacting, and curing. Concrete is characterized by abundant raw materials, low price, and simple production process, leading to its increasing use. Concrete also features high compressive strength, good durability, and a wide range of strength grades. These characteristics make it widely used not only in various civil engineering projects but also in shipbuilding, machinery manufacturing, marine development, geothermal engineering, and more. Concrete is also an important material, and the most important property of concrete mixtures is...

[0003] However, the performance of existing concrete grout is insufficient. After two cycles of winter and summer, the indoor insulation floor begins to deform due to thermal expansion and contraction, resulting in hollow areas and cracks, which affects the building's functionality and durability. Summary of the Invention

[0004] To address the problems existing in the prior art, the purpose of this invention is to provide a construction method for a high-strength self-leveling thermal insulation mortar floor insulation layer.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A method for constructing a high-strength self-leveling thermal insulation mortar floor insulation layer includes the following steps:

[0007] (1) Preparation of thermal insulation mortar:

[0008] Prepare the insulation mortar according to its composition and mix thoroughly. The insulation mortar is calculated by weight and includes:

[0009] 70-90 parts ordinary cement, 80-120 parts fine sand, 52-73 parts fly ash, 46-68 parts talc powder, 28-42 parts modified polystyrene particles, 3-10 parts cellulose ether, 0.6-1.2 parts redispersible adhesive powder, 0.3-1 part defoamer, 0.2-0.6 parts water-reducing agent, and 80-100 parts water;

[0010] (2) Cleaning of the base floor:

[0011] Use a shaving machine to clean the base surface to be constructed, so that the base surface is flat and clean;

[0012] (3) Thickness control line:

[0013] According to the design requirements, find the slope and lay out the lines, and pop out the thickness control lines on the walls around the base layer;

[0014] (4) Grouting construction:

[0015] Apply the prepared thermal insulation mortar, controlling the thickness of the pour and the smoothness of the surface during the process.

[0016] (5) Maintenance:

[0017] After the slurry is completed, it is cured to obtain the thermal insulation slurry floor insulation layer.

[0018] Preferably, in step (1), the ordinary cement is ordinary Portland cement PO42.5.

[0019] Preferably, in step (1), the fine sand is natural sand with a particle size of 0.125-0.25 mm, wherein the natural sand includes one or more of river sand, sea sand, and mountain sand.

[0020] Preferably, in step (1), the particle size of fly ash is 10-30 μm.

[0021] Preferably, in step (1), the particle size of the talc is 20-50 μm.

[0022] Preferably, in step (1), the modified polystyrene particles are particulate products prepared by crosslinking 4-trimethylsilylstyrene, styrene and modified activated titanium diboride; the particle size of the modified polystyrene particles is 2-3 mm.

[0023] Preferably, in step (1), the cellulose ether includes one or more of methylcellulose, hydroxyethyl methylcellulose, carboxymethylcellulose, ethylcellulose, hydroxyethylcellulose, and hydroxypropyl methylcellulose.

[0024] Preferably, in step (1), the solid content of the redispersible adhesive powder is ≥98%, including one or more of vinyl acetate-ethylene copolymer powder, vinyl acetate homopolymer powder, and styrene-butadiene copolymer powder.

[0025] Preferably, in step (1), the defoamer includes one of DF-175, PW-03, and PD-2000B.

[0026] Preferably, in step (1), the water-reducing agent is a polycarboxylate water-reducing agent, including one of HPEG2400, PVA2488s, and DC-WR2.

[0027] Preferably, in step (1), the method for preparing modified polystyrene particles includes:

[0028] S1. Weigh titanium diboride particles into an ethanol solution using a balance, add sodium hydroxide solution dropwise until the pH reaches 9.0-10.0, then add γ-aminopropyltriethoxysilane, heat to 70-80℃, reflux and stir for 3-5 hours, filter out the solid particles, wash with deionized water until the pH reaches 7, and dry in an oven to obtain amino-modified titanium diboride.

[0029] The titanium diboride particles have a particle size of 50-60 μm, and the ethanol solution has a mass fraction of 50%. The mass ratio of titanium diboride particles to ethanol solution is 1:10-20, and the mass ratio of γ-aminopropyltriethoxysilane to titanium diboride particles is 0.25-0.35:1.

[0030] S2. Weigh 2,5-divinyl-1,4-benzaldehyde, amino-modified titanium diboride, and toluene and add them sequentially to the reaction apparatus. After thorough stirring, add aluminum chloride catalyst and heat the reaction apparatus to 70-80℃. Then, keep the reaction at this temperature for 4-8 hours under stirring. After the reaction is complete, remove the solvent under reduced pressure and then wash with water at least three times and with alcohol at least three times. After drying in an oven, the modified activated titanium diboride is obtained.

[0031] The mass ratio of 2,5-divinyl-1,4-phenylenedialdehyde, amino-modified titanium diboride, and toluene is 0.37-0.56:1:10-20.

[0032] S3. Weigh 4-trimethylsilylstyrene and styrene separately and dissolve them in toluene. Then add modified activated titanium diboride and stir evenly at room temperature. Add the initiator benzoyl peroxide and stir the reaction at 70-80℃ for 4-6 hours. Remove the solvent under reduced pressure and then wash with water at least three times and with alcohol at least three times. After drying in an oven, pulverize to obtain modified polystyrene particles.

[0033] The mass ratio of modified activated titanium diboride, 4-trimethylsilylstyrene, styrene and toluene is 1:1.76-2.64:3.12-4.68:20-40; the mass ratio of benzoyl peroxide to styrene is 0.2-0.6:100.

[0034] Preferably, in step (4), the casting thickness is 30-80 mm.

[0035] Preferably, in step (5), the maintenance method is water spraying and covering for moisturizing, the maintenance temperature is 20-30℃, and the maintenance time is at least 7 days.

[0036] The beneficial effects of this invention are as follows:

[0037] 1. This invention provides a construction method for a high-strength self-leveling thermal insulation mortar floor insulation layer. This construction method is convenient to operate and the construction process is relatively simple. However, the final insulation layer has high strength, good crack resistance, is not easily deformed, and has a low probability of producing hollow areas and cracks. Therefore, it can ensure that the insulation layer has good application performance.

[0038] 2. This invention redesigns the thermal insulation mortar for the ground insulation layer. In addition to ordinary cement, its main fillers include fine sand, fly ash, talc, and modified polystyrene particles. Fine sand provides a certain degree of assurance for the strength and workability of the cement. Fly ash has a good filling effect, improving the fluidity and later strength of the cement mortar; talc enhances the strength of the cement and reduces shrinkage; modified polystyrene particles not only provide thermal insulation but also enhance the strength of the cement, reduce its shrinkage, and decrease the probability of hollow areas and cracks, thus enhancing the durability of the cement material.

[0039] 3. The modified polystyrene particles prepared in this invention are obtained using three materials as reactants: 4-trimethylsilylstyrene, styrene, and modified activated titanium diboride. Among them, 4-trimethylsilylstyrene, in addition to conventional styrene, is a styrene compound containing organosilicon groups, and the modified activated titanium diboride is an organically encapsulated inorganic compound with a surface rich in vinyl groups. The three materials react to obtain modified polystyrene particles through cross-linking bonds of vinyl groups. The resulting modified polystyrene particles not only have higher strength but also stronger surface activity, significantly enhancing cement performance.

[0040] 4. The modified activated titanium diboride added in the preparation of modified polystyrene particles is based on high-temperature resistant, high-hardness, and corrosion-resistant titanium diboride material. It is first subjected to surface amino activation treatment, and then undergoes an amine-aldehyde condensation reaction with the aldehyde group in 2,5-divinyl-1,4-phenylenedialdehyde to obtain a coated titanium diboride material with a surface rich in vinyl groups and Schiff bases. It is precisely because of this characteristic that the vinyl groups on its surface can participate in the polymerization with styrene, while the Schiff base gives it unique properties. The combination of the two makes it have good reinforcing performance in cement materials. Detailed Implementation

[0041] The technical solution of the present invention is illustrated below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or defining the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0042] To better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0043] The present invention will be further described below with reference to the following embodiments.

[0044] Example 1

[0045] A method for constructing a high-strength self-leveling thermal insulation mortar floor insulation layer includes the following steps:

[0046] (1) Preparation of thermal insulation mortar:

[0047] Prepare the insulation mortar according to its composition and mix thoroughly;

[0048] (2) Cleaning of the base floor:

[0049] Use a shaving machine to clean the base surface to be constructed, so that the base surface is flat and clean;

[0050] (3) Thickness control line:

[0051] According to the design requirements, find the slope and lay out the lines, and pop out the thickness control lines on the walls around the base layer;

[0052] (4) Grouting construction:

[0053] Apply the prepared thermal insulation mortar, controlling the pouring thickness to 50mm while maintaining the smoothness of the surface.

[0054] (5) Maintenance:

[0055] After the slurry is completed, it is cured by sprinkling water to cover and keep it moist. The curing temperature is 20-30℃ and the curing time is at least 7 days, which will eventually result in a thermal insulation slurry floor insulation layer.

[0056] In step (1) above, the thermal insulation mortar is calculated by weight parts, including:

[0057] 80 parts ordinary cement, 100 parts fine sand, 64 parts fly ash, 56 parts talc powder, 36 parts modified polystyrene particles, 8 parts cellulose ether, 0.9 parts redispersible adhesive powder, 0.6 parts defoamer, 0.4 parts water-reducing agent, and 90 parts water;

[0058] Among them, the ordinary cement is ordinary Portland cement PO42.5; the fine sand is natural sand with a particle size of 0.125-0.25mm; the fly ash has a particle size of 10-30μm; the talc powder has a particle size of 20-30μm; the modified polystyrene particles have a particle size of 2-3mm; the cellulose ether is hydroxyethyl methyl cellulose; the redispersible polymer powder has a solid content of ≥98%, specifically vinyl acetate-ethylene copolymer polymer powder (brand name VINNAPAS 5044N); the defoamer is DF-175; and the water-reducing agent is polycarboxylate water-reducing agent HPEG2400.

[0059] The preparation methods for modified polystyrene particles include:

[0060] S1. Weigh titanium diboride particles into an ethanol solution using a balance, add sodium hydroxide solution dropwise until pH = 9.0-10.0, then add γ-aminopropyltriethoxysilane, heat to 75℃, reflux and stir for 4 hours, filter out solid particles, wash with deionized water until pH = 7, and dry in an oven to obtain amino-modified titanium diboride.

[0061] The titanium diboride particles have a particle size of 50-60 μm, and the ethanol solution has a mass fraction of 50%. The mass ratio of titanium diboride particles to ethanol solution is 1:15, and the mass ratio of γ-aminopropyltriethoxysilane to titanium diboride particles is 0.3:1.

[0062] S2. Weigh 2,5-divinyl-1,4-benzaldehyde, amino-modified titanium diboride, and toluene and add them sequentially to the reaction apparatus. After thorough stirring, add aluminum chloride catalyst, heat the reaction apparatus to 75°C, and then keep it at this temperature for 6 hours under stirring. After the reaction is complete, remove the solvent under reduced pressure, and then wash with water at least three times and with alcohol at least three times. After drying in an oven, the modified activated titanium diboride is obtained.

[0063] The mass ratio of 2,5-divinyl-1,4-phenylenedialdehyde, aminated titanium diboride, and toluene is 0.45:1:15.

[0064] S3. Weigh 4-trimethylsilylstyrene and styrene separately and dissolve them in toluene. Then add modified activated titanium diboride and stir evenly at room temperature. Add the initiator benzoyl peroxide and stir the reaction at 75°C for 5 hours. Remove the solvent under reduced pressure and then wash with water at least three times and with alcohol at least three times. After drying in an oven, pulverize to obtain modified polystyrene particles.

[0065] The mass ratio of modified activated titanium diboride, 4-trimethylsilylstyrene, styrene and toluene is 1:2.2:3.9:30; the mass ratio of benzoyl peroxide to styrene is 0.4:100.

[0066] Example 2

[0067] A method for constructing a high-strength self-leveling thermal insulation mortar floor insulation layer includes the following steps:

[0068] (1) Preparation of thermal insulation mortar:

[0069] Prepare the insulation mortar according to its composition and mix thoroughly;

[0070] (2) Cleaning of the base floor:

[0071] Use a shaving machine to clean the base surface to be constructed, so that the base surface is flat and clean;

[0072] (3) Thickness control line:

[0073] According to the design requirements, find the slope and lay out the lines, and pop out the thickness control lines on the walls around the base layer;

[0074] (4) Grouting construction:

[0075] Apply the prepared thermal insulation mortar, controlling the pouring thickness to 30mm while maintaining the smoothness of the surface.

[0076] (5) Maintenance:

[0077] After the slurry is completed, it is cured by sprinkling water to cover and keep it moist. The curing temperature is 20-30℃ and the curing time is at least 7 days, which will eventually result in a thermal insulation slurry floor insulation layer.

[0078] In step (1) above, the thermal insulation mortar is calculated by weight parts, including:

[0079] 70 parts ordinary cement, 80 parts fine sand, 52 parts fly ash, 46 parts talc powder, 28 parts modified polystyrene granules, 3 parts cellulose ether, 0.6 parts redispersible adhesive powder, 0.3 parts defoamer, 0.2 parts water-reducing agent, and 80 parts water;

[0080] Among them, the ordinary cement is ordinary Portland cement PO42.5; the fine sand is natural sand with a particle size of 0.125-0.25mm; the fly ash has a particle size of 10-30μm; the talc has a particle size of 30-50μm; the modified polystyrene particles have a particle size of 2-3mm; the cellulose ether is methylcellulose; the redispersible polymer powder has a solid content of ≥98% and is vinyl acetate homopolymer powder; the defoamer is model PW-03; and the water-reducing agent is PVA2488s.

[0081] The preparation methods for modified polystyrene particles include:

[0082] S1. Weigh titanium diboride particles into an ethanol solution using a balance, add sodium hydroxide solution dropwise until pH = 9.0-10.0, then add γ-aminopropyltriethoxysilane, heat to 70℃, reflux and stir for 3 hours, filter out solid particles, wash with deionized water until pH = 7, and dry in an oven to obtain aminated titanium diboride.

[0083] The titanium diboride particles have a particle size of 50-60 μm, and the ethanol solution has a mass fraction of 50%. The mass ratio of titanium diboride particles to ethanol solution is 1:10, and the mass ratio of γ-aminopropyltriethoxysilane to titanium diboride particles is 0.25:1.

[0084] S2. Weigh 2,5-divinyl-1,4-benzaldehyde, amino-modified titanium diboride, and toluene and add them sequentially to the reaction apparatus. After thorough stirring, add aluminum chloride catalyst, heat the reaction apparatus to 70°C, and then keep it at this temperature for 4 hours under stirring. After the reaction is complete, remove the solvent under reduced pressure, and then wash with water at least three times and with alcohol at least three times. After drying in an oven, the modified activated titanium diboride is obtained.

[0085] The mass ratio of 2,5-divinyl-1,4-phenylenedialdehyde, aminated titanium diboride, and toluene is 0.37:1:10.

[0086] S3. Weigh 4-trimethylsilylstyrene and styrene separately and dissolve them in toluene. Then add modified activated titanium diboride and stir evenly at room temperature. Add the initiator benzoyl peroxide and stir the reaction at 70°C for 4 hours. Remove the solvent under reduced pressure and then wash with water at least three times and with alcohol at least three times. After drying in an oven, pulverize to obtain modified polystyrene particles.

[0087] The mass ratio of modified activated titanium diboride, 4-trimethylsilylstyrene, styrene and toluene is 1:1.76:3.12:20; the mass ratio of benzoyl peroxide to styrene is 0.2:100.

[0088] Example 3

[0089] A method for constructing a high-strength self-leveling thermal insulation mortar floor insulation layer includes the following steps:

[0090] (1) Preparation of thermal insulation mortar:

[0091] Prepare the insulation mortar according to its composition and mix thoroughly;

[0092] (2) Cleaning of the base floor:

[0093] Use a shaving machine to clean the base surface to be constructed, so that the base surface is flat and clean;

[0094] (3) Thickness control line:

[0095] According to the design requirements, find the slope and lay out the lines, and pop out the thickness control lines on the walls around the base layer;

[0096] (4) Grouting construction:

[0097] Apply the prepared thermal insulation mortar, controlling the pouring thickness to 80mm while maintaining the smoothness of the surface.

[0098] (5) Maintenance:

[0099] After the slurry is completed, it is cured by sprinkling water to cover and keep it moist. The curing temperature is 20-30℃ and the curing time is at least 7 days, which will eventually result in a thermal insulation slurry floor insulation layer.

[0100] In step (1) above, the thermal insulation mortar is calculated by weight parts, including:

[0101] 90 parts ordinary cement, 120 parts fine sand, 73 parts fly ash, 68 parts talc powder, 42 parts modified polystyrene granules, 10 parts cellulose ether, 1.2 parts redispersible adhesive powder, 1 part defoamer, 0.6 parts water-reducing agent, and 100 parts water;

[0102] Among them, the ordinary cement is ordinary Portland cement PO42.5; the fine sand is natural sand with a particle size of 0.125-0.25mm; the fly ash has a particle size of 10-30μm; the talc has a particle size of 20-50μm; the modified polystyrene particles have a particle size of 2-3mm; the cellulose ether is carboxymethyl cellulose; the redispersible polymer powder has a solid content of ≥98% and is styrene-butadiene copolymer powder; the defoamer is PD-2000B; and the water-reducing agent is DC-WR2.

[0103] The preparation methods for modified polystyrene particles include:

[0104] S1. Weigh titanium diboride particles into an ethanol solution using a balance, add sodium hydroxide solution dropwise until pH = 9.0-10.0, then add γ-aminopropyltriethoxysilane, heat to 80℃, reflux and stir for 3-5 hours, filter out solid particles, wash with deionized water until pH = 7, and dry in an oven to obtain aminated titanium diboride.

[0105] The titanium diboride particles have a particle size of 50-60 μm, and the ethanol solution has a mass fraction of 50%. The mass ratio of titanium diboride particles to ethanol solution is 1:20, and the mass ratio of γ-aminopropyltriethoxysilane to titanium diboride particles is 0.35:1.

[0106] S2. Weigh 2,5-divinyl-1,4-benzaldehyde, amino-modified titanium diboride, and toluene and add them sequentially to the reaction apparatus. After thorough stirring, add aluminum chloride catalyst, heat the reaction apparatus to 80°C, and then keep it at this temperature for 8 hours under stirring. After the reaction is complete, remove the solvent under reduced pressure, and then wash with water at least three times and with alcohol at least three times. After drying in an oven, the modified activated titanium diboride is obtained.

[0107] The mass ratio of 2,5-divinyl-1,4-benzaldehyde, aminated titanium diboride, and toluene is 0.56:1:20.

[0108] S3. Weigh 4-trimethylsilylstyrene and styrene separately and dissolve them in toluene. Then add modified activated titanium diboride and stir evenly at room temperature. Add the initiator benzoyl peroxide and stir the reaction at 80°C for 6 hours. Remove the solvent under reduced pressure and then wash with water at least three times and with alcohol at least three times. After drying in an oven, pulverize to obtain modified polystyrene particles.

[0109] The mass ratio of modified activated titanium diboride, 4-trimethylsilylstyrene, styrene and toluene is 1:2.64:4.68:40; the mass ratio of benzoyl peroxide to styrene is 0.6:100.

[0110] Comparative Example 1

[0111] A high-strength self-leveling thermal insulation mortar floor insulation layer differs from Example 1 only in that the modified polystyrene particles in the composition are replaced with commercially available polystyrene particles (YH-03).

[0112] That is, the thermal insulation mortar is calculated by weight parts, including:

[0113] 80 parts ordinary cement, 100 parts fine sand, 64 parts fly ash, 56 parts talc powder, 36 parts polystyrene granules, 8 parts cellulose ether, 0.9 parts redispersible adhesive powder, 0.6 parts defoamer, 0.4 parts water-reducing agent, and 90 parts water.

[0114] Comparative Example 2

[0115] A high-strength self-leveling thermal insulation slurry floor insulation layer differs from Example 1 only in that the preparation method of the modified polystyrene particles in the composition is different.

[0116] That is, the thermal insulation mortar is calculated by weight parts, including:

[0117] 80 parts ordinary cement, 100 parts fine sand, 64 parts fly ash, 56 parts talc powder, 36 parts modified polystyrene particles, 8 parts cellulose ether, 0.9 parts redispersible adhesive powder, 0.6 parts defoamer, 0.4 parts water-reducing agent, and 90 parts water.

[0118] The preparation methods for modified polystyrene particles include:

[0119] 4-Trimethylsilylstyrene and styrene were weighed and dissolved in toluene. After stirring evenly at room temperature, benzoyl peroxide initiator was added. The mixture was stirred and reacted at 75°C for 5 hours. The solvent was removed under reduced pressure. The mixture was then washed with water at least three times and with alcohol at least three times. After drying in an oven, the mixture was pulverized to obtain modified polystyrene particles.

[0120] The mass ratio of 4-trimethylsilylstyrene, styrene and toluene is 2.2:3.9:30; the mass ratio of benzoyl peroxide to styrene is 0.4:100.

[0121] Comparative Example 3

[0122] A high-strength self-leveling thermal insulation slurry floor insulation layer differs from Example 1 only in that the preparation method of the modified polystyrene particles in the composition is different.

[0123] That is, the thermal insulation mortar is calculated by weight parts, including:

[0124] 80 parts ordinary cement, 100 parts fine sand, 64 parts fly ash, 56 parts talc powder, 36 parts modified polystyrene particles, 8 parts cellulose ether, 0.9 parts redispersible adhesive powder, 0.6 parts defoamer, 0.4 parts water-reducing agent, and 90 parts water.

[0125] The preparation methods for modified polystyrene particles include:

[0126] 4-Trimethylsilylstyrene and styrene were weighed and dissolved in toluene, and then titanium diboride was added. After stirring evenly at room temperature, benzoyl peroxide initiator was added. After stirring and reacting at 75°C for 5 hours, the solvent was removed under reduced pressure. The mixture was then washed with water at least three times and with alcohol at least three times. After drying in an oven, it was pulverized to obtain modified polystyrene particles.

[0127] The mass ratio of titanium diboride, 4-trimethylsilylstyrene, styrene and toluene is 1:2.2:3.9:30; the mass ratio of benzoyl peroxide to styrene is 0.4:100.

[0128] Experimental testing

[0129] The thermal insulation mortars prepared in Example 1 and Comparative Examples 1-3 were applied and cured using the same method as in Example 1, and their performance was then tested.

[0130] Compressive strength testing should refer to GB / T 50081-2010; autogenous volume deformation testing should refer to GB / T50082-2009 (non-contact method); slump testing should refer to GB / T 50080-2016; and impermeability grade testing should refer to GB / T 50164-2011.

[0131] Table 1 Performance of different thermal insulation mortars

[0132] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 7-day compressive strength (MPa) 45.6 40.3 40.8 42.2 28-day compressive strength (MPa) 58.5 52.1 52.7 54.9 7-day autogenous volume deformation (με) -80 -145 -130 -120 28-day autogenous volume deformation (με) -160 -270 -250 -230 Slump (mm) 200 205 200 200 impermeability grade ＞P12 P12 P12 P12

[0133] As can be seen from Table 1, the compressive strength of Example 1 of the present invention is higher at both 7 days and 28 days. In terms of self-generated volume deformation, Example 1 and Comparative Examples 1-3 all show shrinkage deformation (the negative sign indicates shrinkage). The self-generated volume deformation of Example 1 at 7 days is -80με and at 28 days is -160με, which is much lower than that of the other comparative examples, indicating that its deformation resistance is better. In addition, the impermeability grade of Example 1 of the present invention can reach the highest >P12 grade, indicating that while the deformation is small, the impermeability is also improved to a certain extent.

[0134] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0135] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for constructing a high-strength self-leveling thermal insulation mortar floor insulation layer, characterized in that, Includes the following steps: (1) Preparation of thermal insulation mortar: Prepare the insulation mortar according to its composition and mix thoroughly. The insulation mortar is calculated by weight and includes: 70-90 parts ordinary cement, 80-120 parts fine sand, 52-73 parts fly ash, 46-68 parts talc powder, 28-42 parts modified polystyrene particles, 3-10 parts cellulose ether, 0.6-1.2 parts redispersible adhesive powder, 0.3-1 part defoamer, 0.2-0.6 parts water-reducing agent, and 80-100 parts water; (2) Cleaning of the base floor: Use a shaving machine to clean the base surface to be constructed, so that the base surface is flat and clean; (3) Thickness control line: According to the design requirements, find the slope and lay out the lines, and pop out the thickness control lines on the walls around the base layer; (4) Grouting construction: Apply the prepared thermal insulation mortar, controlling the thickness of the pour and the smoothness of the surface during the process. (5) Maintenance: After the slurry is completed, it is cured to obtain the thermal insulation slurry floor insulation layer. In step (1), the modified polystyrene particles are particle products prepared by crosslinking 4-trimethylsilylstyrene, styrene and modified activated titanium diboride; In step (1), the preparation method of modified polystyrene particles includes: S1. Weigh titanium diboride particles into an ethanol solution using a balance, add sodium hydroxide solution dropwise until pH=9.0-10.0, then add γ-aminopropyltriethoxysilane, heat to 70-80℃, reflux and stir for 3-5 hours, filter out solid particles, wash with deionized water until pH=7, and dry in an oven to obtain amino-modified titanium diboride. The titanium diboride particles have a particle size of 50-60 μm, and the ethanol solution has a mass fraction of 50%. The mass ratio of titanium diboride particles to ethanol solution is 1:10-20, and the mass ratio of γ-aminopropyltriethoxysilane to titanium diboride particles is 0.25-0.35:

1. S2. Weigh 2,5-divinyl-1,4-benzaldehyde, amino-modified titanium diboride, and toluene and add them sequentially to the reaction apparatus. After thorough stirring, add aluminum chloride catalyst and heat the reaction apparatus to 70-80℃. Then, keep the reaction at this temperature for 4-8 hours under stirring. After the reaction is complete, remove the solvent under reduced pressure and then wash with water at least three times and with alcohol at least three times. After drying in an oven, the modified activated titanium diboride is obtained. The mass ratio of 2,5-divinyl-1,4-phenylenedialdehyde, amino-modified titanium diboride, and toluene is 0.37-0.56:1:10-20. S3. Weigh 4-trimethylsilylstyrene and styrene separately and dissolve them in toluene. Then add modified activated titanium diboride and stir evenly at room temperature. Add the initiator benzoyl peroxide and stir the reaction at 70-80℃ for 4-6 hours. Remove the solvent under reduced pressure and then wash with water at least three times and with alcohol at least three times. After drying in an oven, pulverize to obtain modified polystyrene particles. The mass ratio of modified activated titanium diboride, 4-trimethylsilylstyrene, styrene and toluene is 1:1.76-2.64:3.12-4.68:20-40; the mass ratio of benzoyl peroxide to styrene is 0.2-0.6:

100.

2. The construction method of a high-strength self-leveling thermal insulation mortar floor insulation layer according to claim 1, characterized in that, In step (1), the ordinary cement is ordinary Portland cement PO42.5; the fine sand is natural sand with a particle size of 0.125-0.25mm, wherein the natural sand includes one or more of river sand, sea sand and mountain sand; the particle size of fly ash is 10-30μm; and the particle size of talc is 20-50μm.

3. The construction method of a high-strength self-leveling thermal insulation mortar floor insulation layer according to claim 1, characterized in that, In step (1), the particle size of the modified polystyrene particles is 2-3 mm.

4. The construction method of a high-strength self-leveling thermal insulation mortar floor insulation layer according to claim 1, characterized in that, In step (1), the cellulose ether includes one or more of methylcellulose, hydroxyethyl methylcellulose, carboxymethylcellulose, ethylcellulose, hydroxyethylcellulose, and hydroxypropyl methylcellulose.

5. The construction method of a high-strength self-leveling thermal insulation mortar floor insulation layer according to claim 1, characterized in that, In step (1), the solid content of the redispersible adhesive powder is ≥98%, including one or more of vinyl acetate-ethylene copolymer powder, vinyl acetate homopolymer powder, and styrene-butadiene copolymer powder.

6. The construction method of a high-strength self-leveling thermal insulation mortar floor insulation layer according to claim 1, characterized in that, In step (1), the defoamer includes one of the following models: DF-175, PW-03, and PD-2000B.

7. The construction method of a high-strength self-leveling thermal insulation mortar floor insulation layer according to claim 1, characterized in that, In step (1), the water-reducing agent is a polycarboxylate water-reducing agent, including one of HPEG2400 and DC-WR2.

8. The construction method of a high-strength self-leveling thermal insulation mortar floor insulation layer according to claim 1, characterized in that, In step (4), the pouring thickness is 30-80mm.

9. The construction method of a high-strength self-leveling thermal insulation mortar floor insulation layer according to claim 1, characterized in that, In step (5), the maintenance method is to spray water to cover and moisturize, the maintenance temperature is 20-30℃, and the maintenance time is at least 7 days.