Method for mix proportion design of aerogel mortar with thermal insulation function

Abstract

This invention relates to a method for designing the mix proportion of aerogel mortar with thermal insulation function. The method includes: S1, setting the thermal conductivity K, the aerogel volume content α, and the air-entraining agent content β to determine the paste-aggregate ratio R of the aerogel mortar; S2, determining the dry density ρ of the aerogel mortar; S3, determining the mass m of cementitious material per unit volume of aerogel mortar. c S4, Calculate the mass m of water per unit volume of aerogel mortar. w S5, based on the mass m of cementitious material per unit volume of aerogel mortar. c Aggregate volume V ag and the mass of water m w This invention allows for the design of the mix proportions of aerogel mortar. It enables the design of the dry density and mix proportions of aerogel mortar based on the required thermal insulation performance of building materials, while also meeting strength requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building insulation materials, and particularly relates to a method for designing the mixing ratio of aerogel mortar with insulation function. BACKGROUND

[0002] Under the background of rapid urban development, the energy consumption in the country is also increasing. The annual energy consumption in the building field accounts for more than 45% of the total energy consumption in the country, and the energy consumption in the building operation stage accounts for more than 20% annually. Efficient energy saving and emission reduction has become an important problem to be solved in the building field. The existing building insulation mortar has problems such as mismatching of service life and building structure, poor fire resistance, etc. Therefore, the preparation of aerogel insulation mortar with the same service life as the building structure is an effective way to save energy and reduce emissions at present.

[0003] The main materials used in the field of building insulation materials at home and abroad include expanded perlite, rock wool, ceramic and polyurethane, etc. The materials are relatively common and the cost performance is difficult to improve, so the overall energy consumption is still difficult to reduce while the energy-saving materials are popularized. In addition, it is difficult to consider the density, thermal conductivity and strength of the insulation mortar in the actual application of building engineering, and many quality problems are often caused by low strength, which affects the construction progress. The innovation research in the field of building energy-saving and insulation materials is relatively lacking at present. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the defects of the prior art, and to provide a method for designing the mixing ratio of aerogel mortar with insulation function, which can design the dry density and mixing ratio of aerogel mortar according to the required insulation performance of building materials, and meet the strength requirement.

[0005] In order to solve the above technical problems, the technical scheme of the present application is as follows: a method for designing the mixing ratio of aerogel mortar with insulation function, the method comprising:

[0006] S1, setting the thermal conductivity K, the aerogel volume content α and the air entraining agent content β, determining the slurry-bone ratio R of the aerogel mortar according to formula (1);

[0007]

[0008] S2, determining the dry density ρ of the aerogel mortar according to formula (2);

[0009]

[0010] S3, determining the mass m of cementing materials in unit volume of aerogel mortar according to formula (3) c ;

[0011]

[0012] V is the volume of the aerogel mortar, m is the mass of the cementing materials in unit volume of the aerogel mortar, ρ is the dry density of the aerogel mortar, R is the slurry-bone ratio of the aerogel mortar, K is the thermal conductivity of the aerogel mortar, α is the aerogel volume content, and β is the air entraining agent content.ag The volume of the aggregate in the aerogel mortar per unit volume is obtained according to the slurry aggregate ratio R;

[0013] ρ dec The density of the fine aggregate of the decoration waste is γ, and γ is a constant.

[0014] S4, according to formula (4), the mass of water m w in the aerogel mortar per unit volume is calculated.

[0015]

[0016] Wherein, ρ w is the density of water, and ρ c is the density of the cementitious material.

[0017] S5, according to the mass of the cementitious material m c , the volume of the aggregate V ag and the mass of water m w in the aerogel mortar per unit volume, the mix proportion design of the aerogel mortar is carried out.

[0018] Further, in step S5, specifically:

[0019] The components of the aerogel mortar are aggregate, cementitious material, additive, polypropylene fiber and water.

[0020] The aggregate includes fine aggregate of decoration waste and SiO2 aerogel, and the volume content α of the aerogel is 80%-100%.

[0021] The cementitious material includes cement, slag and silica fume, and the mass ratio is (75-75.2):(19.9-20):(4.9-5).

[0022] The additive includes latex powder, silane coupling agent, water reducing agent, air entraining agent and hydroxypropyl methyl cellulose, the mass of the latex powder is 0.5% of the mass of the cementitious material; the mass of the silane coupling agent is 1% of the mass of the water; the mass of the water reducing agent is 1% of the mass of the cementitious material, the air entraining agent content β is the mass percentage of the air entraining agent in the cementitious material, which is 0.1%-0.3%; the mass of the hydroxypropyl methyl cellulose is 0.2% of the mass of the cementitious material.

[0023] The mass of the polypropylene fiber is 0.2% of the mass of the cementitious material.

[0024] Further, in order to predict in advance whether the aerogel mortar meets the strength requirement, step S1 further includes:

[0025] The compressive strength S of the aerogel mortar is determined according to formula (5), if the compressive strength S does not meet the requirement, returning to the step of setting the thermal conductivity K, if the strength S meets the requirement, performing step S2.

[0026]

[0027] Further, the requirement for the compressive strength S is that the compressive strength S is greater than or equal to 1.0 MPa.

[0028] After the above technical solution is adopted, the present application has the following beneficial effects:

[0029] (1) The aerogel mortar of the present application can obtain the corresponding thermal insulation effect according to the actual needs of the construction engineering, and to a certain extent, the density and the compressive strength are optimized, the comprehensive performance of the thermal insulation mortar is improved, and the thermal insulation mortar is adapted to the use of the building structure, and to a certain extent, the engineering problems can be reduced.

[0030] (2) The new aerogel mortar improves the shortcomings of the traditional thermal insulation mortar, achieves the effects of low density, low thermal conductivity and sufficient compressive strength, converts the building decoration waste fine aggregate into recycled fine aggregate for use, achieves the purpose of realizing the resourceization of the decoration waste fine aggregate, realizes the sustainable utilization of resources, and to a certain extent, promotes the circular economy development of the construction waste. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The flowchart of the aerogel mortar mix design method with thermal insulation function of the present application. DETAILED DESCRIPTION

[0032] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to specific embodiments and in conjunction with the drawings.

[0033] As shown in Figure 1 , an aerogel mortar mix design method with thermal insulation function, the method comprises:

[0034] S1, setting the thermal conductivity K, the aerogel volume content alpha and the air entraining agent content beta, determining the mortar aggregate ratio R of the aerogel mortar according to formula (1);

[0035]

[0036] S2, determining the dry density p of the aerogel mortar according to formula (2);

[0037]

[0038] S3, determining the mass m of the cementing material in unit volume of the aerogel mortar according to formula (3) c .

[0039]

[0040] wherein, V ag is the volume of aggregate in unit volume of aerogel mortar, obtained according to the slurry aggregate ratio R, R = (1-V ag ) / V ag , and (1-V ag ) is the volume of slurry in unit volume of aerogel mortar.

[0041] p dec is the density of the fine aggregate of decoration waste; γ is the hydration proportion coefficient of cementitious material, which is a constant and can be taken as 1.2-1.5;

[0042] S4, calculating the mass m w of water in unit volume of aerogel mortar according to formula (4);

[0043]

[0044] wherein, p w is the density of water, and p c is the density of cementitious material;

[0045] S5, performing the mix proportion design of aerogel mortar according to the mass m c of cementitious material, the volume V ag of aggregate, and the mass m w of water in unit volume of aerogel mortar.

[0046] Specifically, the present embodiment can calculate the slurry aggregate ratio R, the dry density p, the mass m c of cementitious material, and the mass m w of water in unit volume of aerogel mortar according to the set thermal conductivity K, the aerogel volume content a, and the air entraining agent content b, and configure the amount of other components based on the mass m c of cementitious material, the volume V ag of aggregate, and the mass m w of water in unit volume of aerogel mortar. The present embodiment provides a simple and reliable mix proportion design method of aerogel mortar, which can obtain aerogel mortar with corresponding thermal insulation effect according to the actual needs of construction engineering, and to a certain extent, simultaneously optimize the density and compressive strength, improve the comprehensive performance of the thermal insulation mortar, adapt to the use of building structure, and to a certain extent, reduce engineering problems.

[0047] In one embodiment, step S5 is specifically:

[0048] The components of the aerogel mortar are aggregate, cementitious material, admixture, polypropylene fiber, and water.

[0049] The aggregate includes decoration waste fine aggregate and SiO2 aerogel, and the volume content alpha of the aerogel in the aggregate is 80%-100%;

[0050] The cementitious material includes cement, slag and silica fume, and the mass ratio in the cementitious material is (75-75.2):(19.9-20):(4.9-5) in percentage by mass;

[0051] The admixture includes latex powder, silane coupling agent, water reducing agent, air entraining agent and hydroxypropyl methyl cellulose, the mass of the latex powder is 0.5% of the mass of the cementitious material; the mass of the silane coupling agent is 1% of the mass of the water; the mass of the water reducing agent is 1% of the mass of the cementitious material, the air entraining agent content beta is the mass percentage of the air entraining agent in the cementitious material, and is 0.1%-0.3%; the mass of the hydroxypropyl methyl cellulose is 0.2% of the mass of the cementitious material;

[0052] The mass of the polypropylene fiber is 0.2% of the mass of the cementitious material.

[0053] In one embodiment, in step S1, further comprising:

[0054] The compressive strength S of the aerogel mortar is determined according to formula (5), if the compressive strength S does not meet the requirements, returning to the step of setting the thermal conductivity K, if the compressive strength S meets the requirements, proceeding to step S2;

[0055]

[0056] The aerogel mortar has a thermal insulation performance and a compressive strength according to the type II requirements specified in GB / T 20473-2021 standard, the thermal conductivity should be ≤0.085 W / m·K, and the compressive strength should be ≥1.0 MP.

[0057] Specifically, formula (5) is equivalent to obtaining a strength value of a target mortar, because the volume content of the aerogel in the aerogel mortar is relatively large, and the density is as small as possible, so it is found in the early test that sometimes when a mortar with lower density and better thermal insulation effect is desired, the strength basically has problems. Formula (5) can obtain a strength value, which has a reference effect, although the measured value may have a small deviation from the calculated value, but it can indeed be known in advance whether the strength of the mortar to be prepared can meet the ideal requirements, if the calculated strength value calculated here does not meet the specification requirements, it means that even if the mortar can be prepared with this mix ratio, the strength effect may not meet the requirements, and other mix ratios need to be considered.

[0058] It should be noted that formula (1), formula (2) and formula (5) are obtained by data fitting of origin software according to test results. Formula (4) is obtained according to the volume method formula:

[0059]

[0060] wherein, V ag is the volume of aggregate in unit volume of aerogel mortar, obtained according to the slurry aggregate ratio R; m w is the mass of water in unit volume of aerogel mortar; p w is the density of water; m 水泥 is the mass of cement in unit volume of aerogel mortar; p 水泥 is the density of cement; m 矿渣 is the mass of slag in unit volume of aerogel mortar; p 矿渣 is the density of slag; m 硅灰 is the mass of silica fume in unit volume of aerogel mortar; p 硅灰 is the density of silica fume; b is the air entraining agent content; 0.06 + 2b is the volume of air in unit volume of aerogel mortar.

[0061] The technical solutions involved in the above embodiments will be described in detail below according to specific embodiments.

[0062] Embodiment one

[0063] (1) Set the thermal conductivity k as 0.084 W / m·K, the aerogel volume content a as 80%, and the air entraining agent content b as 0.1% of the aerogel mortar;

[0064] (2) According to the formula (1) between the slurry aggregate ratio R of the aerogel mortar and the thermal conductivity K, the aerogel volume content a and the air entraining agent content b, the slurry aggregate ratio R of the aerogel mortar is determined as 0.67;

[0065]

[0066] (3) According to the formula (5) between the compressive strength S of the aerogel mortar and the slurry aggregate ratio R, the aerogel volume content a and the air entraining agent content b, the compressive strength S of the configured aerogel mortar is determined as 1.82 MPa, which meets the type II compressive strength requirement of GB / T 20473-2021 specification;

[0067]

[0068] (4) According to the formula (2) between the dry density p of the aerogel mortar and the slurry aggregate ratio R, the aerogel volume content a and the air entraining agent content b, the dry density p of the configured aerogel mortar is determined as 807.6 kg / m 3 ;

[0069]

[0070] (5) According to formula (3) and formula (4), the water-binder ratio is calculated to be 0.46, and the mixture ratio is designed, in mass parts, cement 317 parts; water 195 parts; slag 85 parts; silica fume 21 parts; latex powder 2.12 parts; air entraining agent 0.42 parts; water reducing agent 4.23 parts; polypropylene fiber 0.85 parts; hydroxypropyl methylcellulose 0.85; silane coupling agent 1.95 parts; renovation waste fine aggregate 258 parts; SiO2 aerogel 48 parts;

[0071]

[0072] wherein, V ag is the volume of the aggregate in the unit volume of aerogel mortar, which is obtained according to the slurry-aggregate ratio R;

[0073] ρ dec is the density of the renovation waste fine aggregate; γ is the hydration proportion coefficient of the cementing material, which is a constant;

[0074]

[0075] wherein, ρ w is the density of water, and ρ c is the density of the cementing material;

[0076] (6) The aerogel mortar after stirring is tested for workability, and is loaded into a mold. The test block is demolded after curing at room temperature for 48 h, and is placed in a standard curing room (temperature 20±2℃, relative humidity ≥95%) for curing;

[0077] (7) After the aerogel mortar is cured for 28 d, the dry density, compressive strength, flexural strength and thermal insulation performance are tested, wherein the thermal conductivity should be ≤0.085 W / m·K and the compressive strength should be ≥1.0 MPa according to the requirements of type II specified in GB / T 20473-2021.

[0078] Example Two

[0079] (1) The aerogel mortar with a thermal conductivity K of 0.077 W / m·K, an aerogel volume content α of 90%, and an air entraining agent content β of 0.1% is set;

[0080] (2) According to formula (1) among the aerogel mortar slurry-aggregate ratio R and the thermal conductivity K, the aerogel volume content α and the air entraining agent content β, the aerogel mortar slurry-aggregate ratio is determined to be 0.53;

[0081]

[0082] (3) According to the formula (5) between the compressive strength S of aerogel mortar and the slurry-bone ratio R, the aerogel volume content a and the air entraining agent content b, it is determined that the strength of the configured aerogel mortar is 1.49 MPa, which meets the type II compressive strength requirements of GB / T 20473-2021 specification.

[0083]

[0084] (4) According to the formula (2) between the dry density p of aerogel mortar and the slurry-bone ratio R, the aerogel volume content a and the air entraining agent content b, it is determined that the dry density p of the configured aerogel mortar is 583.7 kg / m3.

[0085]

[0086] (5) According to the formula (3) and formula (5), the water-binder ratio is calculated to be 0.49, and the mix proportion is designed, in mass fraction, cement 256 parts; water 166 parts; slag 68 parts; silica fume 17 parts; latex powder 1.71 parts; air entraining agent 0.34 parts; water reducing agent 3.41 parts; polypropylene fiber 0.68 parts; hydroxypropyl methyl cellulose 0.68; silane coupling agent 1.66 parts; renovation waste fine aggregate 140 parts; SiO2 aerogel 59 parts.

[0087] (6) After stirring, the aerogel mortar is tested for good working performance and is loaded into the mold. The test block is demolded after 48h of normal temperature curing and is placed in a standard curing room (temperature 20±2℃, relative humidity ≥95%).

[0088] (7) After 28d of standard curing of the aerogel mortar, dry density, compressive strength, flexural strength and thermal insulation performance tests are carried out, among which the thermal conductivity should be ≤0.085 W / m·K and the compressive strength should be ≥1.0 MPa according to the type II requirements of GB / T 20473-2021 specification.

[0089] Example Three

[0090] (1) Set the aerogel mortar with a thermal conductivity K of 0.072 W / m·K, an aerogel volume content a of 100% and an air entraining agent content b of 0.1%;

[0091] (2) According to the formula (1) between the slurry-bone ratio R of aerogel mortar and the thermal conductivity K, the aerogel volume content a and the air entraining agent content b, it is determined that the slurry-bone ratio of the aerogel mortar is 0.44;

[0092]

[0093] (3) According to the formula (5) between the compressive strength S of aerogel mortar and the slurry-bone ratio R, the aerogel volume content α and the air entraining agent content β, it is determined that the compressive strength S of the configured aerogel mortar is 1.23 MPa, which meets the type II compressive strength requirements of GB / T 20473-2021 specification.

[0094]

[0095] (4) According to the formula (2) between the dry density ρ of aerogel mortar and the slurry-bone ratio R, the aerogel volume content α and the air entraining agent content β, it is determined that the dry density of the configured aerogel mortar is 419.0 kg / m 3 .

[0096]

[0097] (5) According to formula (3) and formula (4), the water-binder ratio is calculated to be 0.42, and the mix proportion is designed, in mass fraction, cement 242 parts; water 136 parts; slag 64 parts; silica fume 16 parts; emulsion powder 1.61 parts; air entraining agent 0.32 parts; water reducing agent 3.22 parts; polypropylene fiber 0.64 parts; hydroxypropyl methyl cellulose 0.64 parts; silane coupling agent 1.36 parts; renovation waste fine aggregate 0 parts; SiO2 aerogel 70 parts.

[0098]

[0099] wherein, V ag is the volume of the aggregate in unit volume of aerogel mortar, which is obtained according to the slurry-bone ratio R;

[0100] ρ dec is the density of the renovation waste fine aggregate; γ is the hydration proportion coefficient of the cementing material, which is a constant;

[0101]

[0102] wherein, ρ w is the density of water, and ρ c is the density of the cementing material;

[0103] (6) After the aerogel mortar is stirred, the working performance is tested, and the aerogel mortar is loaded into the mold. The test block is demolded after 48h of normal temperature curing, and is placed in a standard curing room (temperature is 20±2℃, relative humidity is ≥95%) for curing.

[0104] (7) After the aerogel mortar is cured for 28d, the dry density, compressive strength, flexural strength and thermal insulation performance test are carried out, wherein the thermal conductivity coefficient should be ≤0.085 W / m·K and the compressive strength should be ≥1.0 MPa according to the type II requirements of GB / T 20473-2021 specification.

[0105] Example Four

[0106] (1) Set the thermal conductivity coefficient K as 0.082 W / m·K, the aerogel volume content α as 80%, and the air entraining agent content β as 0.2% of the aerogel mortar;

[0107] (2) According to the formula (1) between the aerogel mortar paste ratio R and the thermal conductivity coefficient K, the aerogel volume content α and the air entraining agent content β, the aerogel mortar paste ratio is determined as 0.67.

[0108]

[0109] (3) According to the formula (5) between the compressive strength S of the aerogel mortar and the paste ratio R, the aerogel volume content α and the air entraining agent content β, the strength of the configured aerogel mortar is determined as 1.72 MPa, which meets the type II compressive strength requirement of GB / T20473-2021 specification.

[0110]

[0111] (4) According to the formula (2) between the dry density ρ of the aerogel mortar and the paste ratio R, the aerogel volume content α and the air entraining agent content β, the dry density of the configured aerogel mortar is determined as 739.6 kg / m 3 .

[0112]

[0113] (5) According to formula (3) and formula (4), the water-binder ratio is calculated as 0.54, and the mix proportion design is carried out, in mass parts, cement 289 parts; water 206 parts; slag 77 parts; silica fume 19 parts; emulsion powder 1.93 parts; air entraining agent 0.77 parts; water reducing agent 3.85 parts; polypropylene fiber 0.77 parts; hydroxypropyl methyl cellulose 0.77 parts; silane coupling agent 2.06 parts; fine aggregate of decoration waste 258 parts; SiO2 aerogel 48 parts.

[0114]

[0115] Wherein, V ag is the volume of the aggregate in unit volume of aerogel mortar, which is obtained according to the paste ratio R;

[0116] ρ dec is the density of the fine aggregate of decoration waste; γ is the hydration proportion coefficient of cementitious materials, which is a constant;

[0117]

[0118] Wherein, ρ w is the density of water, and ρ c is the density of cementitious materials;

[0119] (6) The stirred aerogel mortar is tested for good working performance and loaded into a mold. The test block is demolded after 48h of curing at room temperature and placed in a standard curing room (temperature 20±2℃, relative humidity≥95%) for curing.

[0120] (7) After 28d of standard curing of the aerogel mortar, dry density, compressive strength, flexural strength and thermal insulation performance tests are performed. According to the requirements of type II specified in GB / T 20473-2021, the thermal conductivity should be≤0.085W / m·K, and the compressive strength should be≥1.0MPa.

[0121] Example Five

[0122] (1) An aerogel mortar with a thermal conductivity K of 0.080W / m·K, an aerogel volume content α of 80%, and an air entraining agent content β of 0.3% is set.

[0123] (2) According to formula (1) between the aerogel mortar binder ratio R and the thermal conductivity K, the aerogel volume content α and the air entraining agent content β, the aerogel mortar binder ratio is determined to be 0.67.

[0124]

[0125] (3) According to formula (5) between the compressive strength S of the aerogel mortar and the binder ratio R, the aerogel volume content α and the air entraining agent content β, the compressive strength S of the configured aerogel mortar is determined to be 1.62MPa, which meets the type II compressive strength requirements of GB / T 20473-2021.

[0126]

[0127] (4) According to formula (2) between the dry density p of the aerogel mortar and the binder ratio R, the aerogel volume content α and the air entraining agent content β, the dry density of the configured aerogel mortar is determined to be 671.6kg / m3.

[0128]

[0129] (5) According to formula (3) and formula (4), the water-binder ratio is calculated to be 0.59, and the mix proportion is designed, in mass parts, cement 270 parts; water 213 parts; slag 72 parts; silica fume 18 parts; latex powder 1.80 parts; air entraining agent 1.08 parts; water reducing agent 3.6 parts; polypropylene fiber 0.72 parts; hydroxypropyl methylcellulose 0.72 parts; silane coupling agent 2.13 parts; renovation waste fine aggregate recycled fine aggregate 258 parts; SiO2 aerogel 48 parts.

[0130]

[0131] wherein, V ag is the volume of aggregate in unit volume of aerogel mortar, obtained according to the slurry aggregate ratio R;

[0132] p dec is the density of the fine aggregate of decoration waste; and γ is the hydration proportion coefficient of cementitious materials, which is a constant;

[0133]

[0134] wherein, p w is the density of water, and p c is the density of cementitious materials;

[0135] (6) The aerogel mortar after stirring is tested for workability, and is loaded into a mold. The test block is demolded after curing at room temperature for 48 h, and is placed in a standard curing room (temperature is 20±2℃, relative humidity is ≥95%) for curing.

[0136] (7) After the aerogel mortar is cured for 28 d according to the standard, dry density, compressive strength, flexural strength and thermal insulation performance tests are performed. According to the requirements of type II specified in GB / T 20473-2021, the thermal conductivity should be ≤0.085 W / m·K, and the compressive strength should be ≥1.0 MPa.

[0137] The test results are shown in Table 1

[0138] Table 1 Example 1-Example 5

[0139]

[0140] The test results show that the measured values of dry density and compressive strength in the examples are consistent with the theoretical values within the error range, and meet the quantitative relationship of dry density, compressive strength, slurry aggregate ratio and thermal conductivity. The compressive strength and flexural strength both meet the use requirements of building insulation mortar; in actual application, the dry density and thermal conductivity of the mortar are effectively reduced, which can improve the thermal insulation performance of the structure while reducing the industrial energy consumption, and achieve the goal of green and sustainable development. Through the above analysis, the application can effectively alleviate the problem of huge energy consumption of the building industry, and can also increase the resource utilization rate of the fine aggregate of building decoration waste to a certain extent, and reduce the pollution to the environment. The mix proportion design can be quickly and accurately performed according to the thermal insulation performance requirements of the used structure, which provides effective theoretical basis and data support for the engineering application of the fine aggregate of building decoration waste aerogel insulation mortar.

[0141] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A method for designing a mixture ratio of aerogel mortar with thermal insulation function, characterized in that, The method comprises: S1, setting a thermal conductivity coefficient K, an aerogel volume content a and an air entraining agent content β, determining a slurry aggregate ratio R of the aerogel mortar according to formula (1); （1） S2, determining a dry density p of the aerogel mortar according to formula (2); （2） S3, determining the mass of the cementitious material in the aerogel mortar per unit volume according to formula (3) ; （3） wherein, Vb is the volume of the aggregate in the unit volume of the aerogel mortar, obtained from the slurry aggregate ratio R; The density of the fine aggregate of the decoration waste; γ is the hydration proportion coefficient of the cementitious material, and is a constant, and the value is 1.2-1.5; S4, calculate the mass of water in the aerogel mortar per unit volume according to formula (4) ; （4） wherein is the density of water, is the density of the cementitious material; S5, according to the mass of cementitious material in unit volume of aerogel mortar , the mass of aggregate and water , the mix proportion design of aerogel mortar is carried out; specifically: Each component of the aerogel mortar is aggregate, cementitious material, additive, polypropylene fiber and water; The aggregate includes decoration waste fine aggregate and SiO2 aerogel, and the aerogel volume content a is the volume ratio of SiO2 aerogel in the aggregate, which is 80%-100%; The cementitious material includes cement, slag and silica fume, and the mass ratio in the cementitious material is (75-75.2):(19.9-20):(4.9-5) in mass percentage; The additive includes latex powder, silane coupling agent, water reducing agent, air entraining agent and hydroxypropyl methyl cellulose, the mass of the latex powder is 0.5% of the mass of the cementitious material; the mass of the silane coupling agent is 1% of the mass of the water; the mass of the water reducing agent is 1% of the mass of the cementitious material, the air entraining agent content β is the mass percentage of the air entraining agent in the cementitious material, which is 0.1%-0.3%; the mass of the hydroxypropyl methyl cellulose is 0.2% of the mass of the cementitious material; The mass of the polypropylene fiber is 0.2% of the mass of the cementitious material; In step S1, further comprising: Determine the compressive strength S of the aerogel mortar according to formula (5), if the compressive strength S does not meet the requirements, return to the step of setting the thermal conductivity coefficient K, if the strength S meets the requirements, proceed to step S2; （5）。 2. The method for designing a mixture ratio of aerogel mortar with thermal insulation function according to claim 1, characterized in that, The requirement for the compressive strength S is ≥1.0 MPa.

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